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| july 2009 doc id 16048 rev 1 1/77 1 TDA7541B am/fm car radio tuner ic with stereo decoder and intelligent selectivity system features fm part ? agc generation by rf and if detection ? i/q mixer for 1 st if 10.7 mhz with image rejection ?mixer for 2 nd if 450 khz ? internal 450 khz band pass filter with bandwidth control by iss ? fully integrated fm demodulator with noise cancellation am part ? wide and narrow agc generation ?mixer for 1 st if 10.7 mhz, am up conversion ?mixer for 2 nd if 450 khz ? integrated am-demodulator ? am if noise blanking stereo decoder ? pll with adjustment free, fully integrated vco ? automatic pilot dependent mono/stereo switching ? programmable roll-off compensation ? high cut and stereo blend-characteristics programmable ? dedicated rds mute ? audio noise blanker additional features ? vco for world tuning range ? high performance fast pll for rds- system ? if counter for fm and am with search stop signal ? quality detector for level, deviation, adjacent channel and multipath ? iss (intelligent selectivity system) for cancellation of adjacent channel and noise influences ? adjacent channel mute ? fully electronic alignment ? independent weather band input ? all functions i 2 c bus controlled description the TDA7541B is a high performance tuner circuit with stereo decoder for am/fm car radio. it contains a mixer, if amplifier, demodulator for am and fm, stereo decoder, quality detection, iss filter and pll synthesizer with if counter on a single chip. use of bicmos technology allows the implementation of several tuning functions and a minimum of external components. lqfp64 table 1. device summary order code package packing TDA7541B lqfp64 (10 x 10 x 1.4 mm) tray TDA7541Btr lqfp64 (10 x 10 x 1.4 mm) tape and reel TDA7541Bw lqfp64 (14 x 14 x 1.4 mm) tray TDA7541Bwtr lqfp64 (14 x 14 x 1.4 mm) tape and reel www.st.com
contents TDA7541B 2/77 doc id 16048 rev 1 contents 1 block circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 pin connection and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 electrical specificati ons and characteristics . . . . . . . . . . . . . . . . . . . . 10 3.1 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3.1 globals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3.2 fm section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3.3 am section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.3.4 stereo decoder section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.3.5 pll section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.1 fm part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.1.1 mixer 1 agc and if amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.1.2 mixer2, limiter, fm demodulator and spike cancellation . . . . . . . . . . . . 26 4.1.3 quality detection and iss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.1.4 block diagram quality detection principle . . . . . . . . . . . . . . . . . . . . . . . . 29 4.1.5 strong adjacent channel correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 4.1.6 weak signal mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 4.1.7 weather band input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.2 am section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.2.1 usage of control bit adsel (addr23d7) . . . . . . . . . . . . . . . . . . . . . . . . 32 4.3 stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.3.1 decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.3.2 noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 4.3.3 functional description of the multipath detector . . . . . . . . . . . . . . . . . . 37 4.3.4 quality detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4.3.5 afs control and stereo decoder mute . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4.4 pll and if counter section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 TDA7541B contents doc id 16048 rev 1 3/77 4.4.1 pll frequency synthesizer block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 4.4.2 if counter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 4.5 i 2 c bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5 software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.1 chip address and overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.2 address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 5.3 control register function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.4 data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 6 appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 7 application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 list of tables TDA7541B 4/77 doc id 16048 rev 1 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 3. thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 4. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 5. globals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 6. fm section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 7. am section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 table 8. stereo decoder section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 9. pll section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 table 10. iss filter control by i 2 c bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 table 11. internal iss control signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 table 12. iss control modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 table 13. usage of adsel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 table 14. address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 table 15. i 2 c control bit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 table 16. subaddress description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 table 17. addr 0 tpll charge pump control (0bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 table 18. addr 1 tpll counter 1 (lsb). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 table 19. addr 2 tpll counter 2 (msb) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 table 20. addr 3 tv(00h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 table 21. addr 4 tv/if counter (fm ach, am 1ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 table 22. addr 5 tpll divider (fm 3dh, am 2dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 table 23. addr 6 agc (fm 06h, am 2ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 table 24. addr 7 quality ac (fm 50h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 table 25. addr 8 quality acm/mp (fm 6ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 table 26. addr 9 quality dev (fm 49h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 table 27. addr 10 quality mux/fsu (fm 0eh, am 0fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 table 28. addr 11 weak signal mute (fm a8h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 table 29. addr 12 am if nb (am b1h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 table 30. addr 13 xtal adjust(80h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 table 31. addr 14 if2 adjust (fm e8h, am 08h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 table 32. addr 15 iq adjust / switch (fm e7h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 table 33. addr 16 fm keying agc (fm 1dh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 table 34. addr 17 roll off / level gain (77h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 table 35. addr 18 sd stereoblend / am corner frequency (0dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 table 36. addr 19 sd high cut (2fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 table 37. addr 20 sd mp (fm 97h, am 3fh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 table 38. addr 21 sd quality (ffm 7ah, am fah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 table 39. addr 22 sd nb i (fm 05h, am 04h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 table 40. addr 23 sd nb ii (fm e2h, am c2h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 table 41. addr 24, 26, 27, 28, 29 testing (feh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 table 42. addr 25 testing (feh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 table 43. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 TDA7541B list of figures doc id 16048 rev 1 5/77 list of figures figure 1. block circuit diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 2. pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 3. programming of hc filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 figure 4. programming of stereo blend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 figure 5. adaptive threshold control of noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 figure 6. stereo blend controlled threshold adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 6 figure 7. deviation controlled threshold adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 figure 8. block diagram fm part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 figure 9. block diagram vco . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 figure 10. block diagram iss function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 figure 11. block diagram am path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 figure 12. block diagram stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 figure 13. block diagram audio noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 figure 14. block diagram multi path detection for stereo decoder. . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 figure 15. application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 figure 16. lqfp64 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 block circuit diagram TDA7541B 6/77 doc id 16048 rev 1 1 block circuit diagram figure 1. block circuit diagram TDA7541B pin connection and pin description doc id 16048 rev 1 7/77 2 pin connection and pin description 2.1 pin connection figure 2. pin connection (top view) wb 5 ammix1raf 6 ampindr 7 amrfagcout 4 ammix1in 3 devtc 2 vccmix1 1 fmpindr 12 fmmix1in1 fmmix1in2 8 gndrf 9 sw 22 lphc 21 lpf 20 vref2 19 lpout 18 gndvco 17 fsu 27 scl 26 sda 25 sstop 24 mux 23 gndstd 38 if1ref 58 mptc 39 mutetc 42 mpxout 43 mpxin 41 amif2ref 44 fmrefdemc 45 gnddem 46 amif2in 47 vref1 48 amrfagctc 54 mix2in 56 mix2inref 55 if1ampout 59 amrefdemc 40 vccif1 60 if1ampin 61 gndif 62 amagc2tc 57 mix1ref 63 mix1out 64 10 tv 11 fmagctc 13 vcob 14 vcoe 15 vccvco 16 xtald 32 isstc2 31 isstc1 30 xtalg 29 fstc 28 gndvcc1 33 r 35 l 34 fswo 37 vcc1 36 gndvcc2 49 vcc2 51 50 mix2ref 52 mix2out 53 mix2ampout pin connection and pin description TDA7541B 8/77 doc id 16048 rev 1 2.2 pin description table 2. pin description pin no. pin name function 1 vccmix1 mixer1 supply 2 devtc deviation detector time constant 3 ammix1in am mixer1 input 4 amrfagcout am rf agc voltage output 5 wb weather band input 6 ammix1ref am mixer1 reference 7 ampindr am pin diode driver output 8 fmmix1in1 fm mixer1 input1 9 gndrf rf ground 10 fmmix1in2 fm mixer1 input2 11 tv tuning voltage preselection 12 fmpindr fm pin diode driver output 13 fmagctc fm agc time constant 14 vcob vco input base 15 vcoe vco output emitter 16 vccvco vco supply 17 gndvco vco ground 18 lpout opamp output to pll loop filter 19 vref2 voltage reference for pll opamp 20 lpf opamp input to pll loop filter 21 lphc high current pll loop filter input 22 sw free programmable switch output 23 mux multiplexer output 24 sstop search stop output 25 sda i 2 c bus data 26 scl i 2 c bus clock 27 fsu unweighted field strength output 28 fstc s-meter filtering capacitor 29 xtalg xtal oscillator to mos gate 30 isstc1 iss filter time constant1 (slow) 31 isstc2 iss filter time constant2 (fast) 32 xtald xtal oscillator to mos drain 33 gndvcc1 digital ground TDA7541B pin connection and pin description doc id 16048 rev 1 9/77 34 l stereo decoder output left 35 r stereo decoder output right 36 vcc1 digital supply 37 fswo weighted field strength output 38 gndstd stereo decoder ground 39 mptc multipath detector time constant 40 amrefdemc am demodulator reference 41 mpxin stereo decoder input 42 mutetc weak signal mute time constant 43 mpxout am audio / mpx output 44 amif2ref am if2 amplifier reference voltage 45 fmrefdemc fm demodulator reference 46 gnddem fm demodulator ground 47 amif2in am if2 amplifier input 48 vref1 5v reference 49 gndvcc2 analog ground 50 mix2ampout mixer2 amplifier output 51 vcc2 analog supply 52 mix2ref mixer2 reference 53 mix2out mixer2 output 54 amrfagctc am rf agc time constant 55 mix2inref mixer2 input reference 56 mix2in mixer2 input 57 amagc2tc am agc2 time constant 58 if1ref if1 amplifier reference 59 if1ampout if1 amplifier output 60 vccif1 if1 supply 61 if1ampin if1 amplifier input 62 gndif1 if1 ground 63 mix1ref mixer1 reference 64 mix1out mixer1 output table 2. pin description (continued) pin no. pin name function electrical specifications and characteristics TDA7541B 10/77 doc id 16048 rev 1 3 electrical specifications and characteristics 3.1 thermal data 3.2 absolute maximum ratings 3.3 electrical characteristics 3.3.1 globals t amb = 25 c, v cc1 = v cc2 = v ccmix1 = v ccvco = v ccif = 8.5 v, f xtal = 10.25 mhz, in application circuit, unless otherwise specified. table 3. thermal data symbol parameter value unit r th(j-amb) thermal resistance junction-to-ambient max. 70 c/w table 4. absolute maximum ratings symbol parameter conditions value unit v s supply voltage - 9.5 v t amb ambient temperature - -40 to 85 c t stg storage temperature - -55 to +150 c v esd esd withstand voltage human body model 2 kv machine model 100 v charged device model 300 v table 5. globals item symbol parameter test co nditions min. typ. max. unit 1. supply 1.1 v cc1 digital supply voltage - 7.7 8.5 9 v 1.2 v cc2 analog supply voltage - 7.7 8.5 9 v 1.3 v ccvco vco supply voltage - 7.7 8.5 9 v 1.4 v ccmix1 mixer1 supply voltage - 7.7 8.5 9 v 1.5 v ccif if1 supply voltage - 7.7 8.5 9 v 1.6 i cc1 supply current fm on - 19 23 ma 1.7 i cc1 supply current am on - 21 25 ma 1.8 i cc2 supply current fm on - 48 58 ma 1.9 i cc2 supply current am on - 37 44 ma TDA7541B electrical specifications and characteristics doc id 16048 rev 1 11/77 3.3.2 fm section t amb = 25 c, v cc1 = v cc2 = v ccmix1 = v ccvco = v ccif = 8.5 v, f xtal = 10.25 mhz, f rf = 98 mhz, dev = 40 khz, f mod = 1 khz, in application circ uit, unless otherwise specified. 1.10 i ccvco supply current - - 12 15 ma 1.11 i ccmix1 supply current fm on - 32 40 ma 1.12 i ccmix1 supply current am on - 20 24 ma 1.13 i ccif supply current - - 4 5 ma 2. reference voltages 2.1 v ref1 internal reference voltage i ref1 = 0ma 4.855.2v 2.2 v ref2 internal reference voltage i ref2 = 0ma 2.4 2.5 2.6 v 3. i 2 c bus interface 3.1 f scl clock frequency - - - 400 khz 3.2 v il input low voltage - - - 1 v 3.3 v ih input high voltage - 2 - - v 3.4 i in input current - -5 - 5 a 3.5 v o output acknowledge voltage i o = 1.6ma - - 0.4 v table 5. globals (continued) item symbol parameter test co nditions min. typ. max. unit table 6. fm section item symbol parameter test co nditions min. typ. max. unit 4. wide band rf agc 4.1 v 8-10 lower threshold start v 13 = 2.5 v, rfk ?0? - 79 - db v 4.2 v 8-10 upper threshold start v 13 = 2.5 v, rfk?0? - 93 - db v 4.3 v 8-10 control range rf kagc kagc?000?, rfagc?00?, v 37 = 3.0?.3.7 v, rfk?1? 5811- 5. narrow band if and keying agc 5.1 v 61 lower threshold start kagc = off, v 8-10 = 0 mv rms - 82 - dbv 5.2 v 61 upper threshold start kagc = off, v 8-10 = 0 mv rms - 94 - dbv 5.3 v 61 max. ifagc threshold with kagc kagc?000?,ifagc?00?, v 37 = 3.0 v - 97 - dbv 5.4 v 37 start point kagc kagc?000?,ifagc?00?, 3.2 3.4 3.6 v 5.5 v 61 control range if kagc kagc?000?,ifagc?00?, v 37 = 3.2?.3.9 v 12 15 18 db 6. agc time constant output 6.1 v 13 max. agc output voltage v 8-10 = 0 mv rms -- v ref1 +v be v electrical specifications and characteristics TDA7541B 12/77 doc id 16048 rev 1 6.2 v 13 min. agc output voltage v 8-10 = 100 mv rms --0.5v 6.3 i 13 min. agc charge current v 8-10 = 0 mv rms ,v 13 = 2.5 v -33 -25 -17.5 a 6.4 i 13 max. agc discharge current v 8-10 = 100 mv rms ,v 13 = 2.5 v 1.7 2.5 3.3 ma 7. agc pin diode driver output 7.1 i 12 agc out, current min. v 8-10 = 0 mv rms , v 12 = 2.5v 15 25 35 a 7.2 i 12 agc out, current max. v 8-10 = 50 mv rms , v 12 = 2.5 v - - -16 ma 8. fm i/q mixer1 (10.7 mhz) 8.1 r in input resistance differential 8 10 12 k ? 8.2 c in input capacitance differential - 4 - pf 8.3 r out output resistance - 530 660 790 8.4 v 8,11 input dc bias - 2.2 2.5 2.8 v 8.5 g gain unloaded 20 22 24 db 8.6 g l gain with 330 load 14 16 18 db 8.7 inoise equivalent input noise - - 3 - nv/ hz 8.8 cp 1db 1db compression point referred to diff. mixer input - 100 - dbv 8.9 iip3 3 rd order intermodulation - - 119 - dbv 8.10 iqp i/q phase adjust ph -7 - +8 deg 8.11 irr image rejection ratio ratio wanted/image 30 40 - db 8.12 irr image rejection ratio with phase adjust 40 46 - db 9. wb i/q mixer1 (10.7 mhz) 9.1 r in input resistance single ended 1.7 2.5 3.3 k ? 9.2 c in input capacitance single ended - 3 - k ? 9.3 r out output resistance - 530 660 790 9.4 v 5 input dc bias - 2 2.3 2.6 v 9.5 g gain unloaded 24 26 28 db 9.6 inoise equivalent input noise source impedance 400 -2.3 -nv/ hz 9.7 iip3 3 rd order intermodulation - - 113 - dbv 10. if1 amplifier (10.7 mhz) 10.1 r in input resistance - 265 330 396 10.2 c in input capacitance - - 2.5 - pf 10.3 v 61 dc input voltage - - v ccif1 /3 - v 10.4 r out output resistance - 265 330 396 10.5 c out output capacitance - - 2.5 - pf table 6. fm section (continued) item symbol parameter test co nditions min. typ. max. unit TDA7541B electrical specifications and characteristics doc id 16048 rev 1 13/77 10.6 v 59 dc output voltage - - v ccif1 /2 - v 10.7 g min min. gain ifg - 9 - db 10.8 g max max. gain ifg - 21 - db 10.9 inoise equivalent input noise voltage g max , r gen =330 , r l =330 , noise of r gen not included - 3.2 - nv/ hz 10.10 cp 1db 1 db compression point referred to 330 input, g max -99 -dbv 10.11 iip3 3 rd order intermodulation referred to 330 input, g max - 130 - dbv 11. mixer2 (450khz) 11.1 r in input resistance differential 240 300 360 11.2 c in input capacitance - - 2.5 - pf 11.3 v 55.56 dc input voltage - 3.7 4 4.3 v 11.4 r out output resistance - 100 - - k 11.5 c out output capacitance - - 2.5 - pf 11.6 v 52,53 dc output voltage - 3.7 4 4.3 v 11.7 g m conversion transconductance wb mode; referred to mix2out - 126 - a/v 11.8 g gain fm mode, referred to mix2out - 16 - db 11.9 c step min. cap. step if2a - 2.2 - pf 11.10 c max max. cap. if2a - 33 - pf 11.11 inoise equivalent input noise voltage, including buffer mixer2 r gen = 330 , if2q?10? noise of r gen not included -15 -nv/ hz 11.12 cp 1db 1db compression point referred to 330 input,if2q?10? - 116 - db v 11.13 iip3 3 rd order intermodulation referred to 330 input,if2q?10? - 132 - db v 12. demodulator, audio output 12.1 thd total harmonic distortion dev.= 75 khz, v 56 = 100 dbv, if2q?11? - 0.1 0.3 % 12.2 a am am suppression v 56 =100 db, f = 40 khz, f mod =1 khz, f mod =1 khz@am, m =0.3 % 40 60 - db 12.3 v mpx mpx output signal dev.= 75 khz 440 500 560 mv rms 12.4 r out output impedance - 20 40 60 12.5 r load load resistance - 10 - - k table 6. fm section (continued) item symbol parameter test co nditions min. typ. max. unit electrical specifications and characteristics TDA7541B 14/77 doc id 16048 rev 1 12.6 (s+n)/n signal plus noise-to-noise ratio at mpxout f = 40 khz, f mod =1 khz, v 56 =100 dbv, de-emphasis = 50 s, b = 200 hz to 15 khz issena = 0 70 - - db 12.7 (s+n)/n signal plus noise-to-noise ratio in weatherband mode f = 3.5 khz, f mod =1 khz, v 56 =100 dbv, de-emphasis = 75 s, setting see ta bl e 1 0 40 - - db 13. quality detection unweighted field stre ngth (fsu) and weight ed field strength 13.1 v 37 dc output voltage v 56 = 20 db v, fmon=1, fswo = off -2.5 - v 13.2 v 37 dc output voltage v 56 = 50 db v, fmon=1, fswo = off -3 -v 13.3 v 37 dc output voltage v 56 = 70 db v, fmon=1, fswo = off -3.5 - v 13.4 v 37 dc output voltage v 56 > 120 db v, fmon=1, fswo = off -4.6 - v 13.5 v 37 slope - - 25 - mv/db 13.6 v 37 dc offset - -200 - 0 mv 13.7 r out output impedance fswo 17 23.5 30 k 13.8 v 27 dc output voltage v 56 = 20 db v, fmon=1, sl=?101? -0.10.4v 13.9 v 27 dc output voltage v 56 = 50 db v, fmon=1, sl=?101? -1 -v 13.10 v 27 dc output voltage v 56 = 70 db v, fmon=1, sl=?101? -2 -v 13.11 v 27 dc output voltage v 56 > 120 db v, fmon=1, sl=?101? 4- -v 13.12 v 27 slope - - 50 - mv/db 13.13 r out output impedance fsu 320 400 480 13.14 r load load resistor fsu - 20 - k 13.15 v 27 dc output voltage am v 47 = 20 db v, fmon = 0, sl= ?010? -0.10.3v 13.16 v 27 dc output voltage am v 47 = 40 db v, fmon = 0, sl= ?010? -1.25 - v 13.17 v 27 dc output voltage am v 47 = 60 db v, fmon = 0, sl= ?010? -3.0 - v 13.18 v 27 dc output voltage am v 47 > 100 db v, fmon = 0, sl= ?010? 4.5 - - v table 6. fm section (continued) item symbol parameter test co nditions min. typ. max. unit TDA7541B electrical specifications and characteristics doc id 16048 rev 1 15/77 13.19 v 27 slope am fmon=0 - 90 - mv/db 13.20 f lp -3 db frequency low pass am fmon=0 - 40 - khz adjacent channel gain 13.21 g ac gain - - 32 - db adjacent channel filter 13.22 f hp -3 db frequency highpass acf=0 - 100 - khz 13.23 f -20db attenuation 20db - - 70 - khz 13.24 f bp centre frequency acf=1 - 100 - khz multipath channel gain 13.25 g mp gain - - 12 - db multipath bandpass filter 13.26 f c centre frequency - - 19 - khz 13.27 q quality factor - 5 8 10 - 14. iss (intelligent select ivity system) filter 450khz 14.1 f centre centre frequency f ref_intern = 450khz 450 khz 14.2 bw 3db bandwidth, -3 db issbw = 1 70 80 90 khz 14.3 bw 20db bandwidth, -20 db issbw = 1 132 150 168 khz 14.4 bw 3db bandwidth, -3 db issbw = 0 106 120 135 khz 14.5 bw 20db bandwidth, -20 db issbw = 0 220 250 280 khz 14.6 bw 3db bandwidth weather band wbon = 1 18 22 26 khz 14.7 bw 20db -20db weather band wbon = 1 - 70 - khz adjacent channel iss filter threshold 14.8 v thac internal low threshold acth - 2.75 - v 14.9 v thac internal high threshold acth - 3.05 - v multipath threshold 14.10 v thmp internal low threshold mpth - 0.50 - v 14.11 v thmp internal high threshold mpth - 1.25 - v iss filter ti me constant 14.12 i 30,31 charge current low mid tiss, bwdef = 1 -89 -74 -59 a 14.13 i 30,31 charge current high mid tiss, bwdef = 1 -72 -60 -48 a 14.14 i 30,31 charge current low narrow tiss, bwdef = 1 -148 -124 -99 a 14.15 i 30,31 charge current high narrow tiss, bwdef = 1 -132 -110 -88 a 14.16 i 30,31 discharge current low tiss, bwdef = 0 0.5 1 1.5 a table 6. fm section (continued) item symbol parameter test co nditions min. typ. max. unit electrical specifications and characteristics TDA7541B 16/77 doc id 16048 rev 1 14.17 i 30,31 discharge current high tiss, bwdef = 0 11 15 19 a 14.18 v 30,31 low voltage bwdef = 0 - 0.1 0.2 v 14.19 v 30,31 high voltage bwdef = 1 4.6 4.9 - v iss filter switch threshold 14.20 v 30,31 threshold iss on bwdef = 0 - 3 - v 14.21 v 30,31 threshold iss off bwdef = 0 - 1 - v 14.22 v 30,31 threshold iss narrow on bwdef = 0 - 4 - v 14.23 v 30,31 threshold iss narrow off bwdef = 0 - 2 - v deviation detection 14.24 i 3 charge current low tdev -40 -32 -20 a 14.25 i 3 charge current high tdev -48 -39 -30 a 14.26 i 3 discharge current low tdev 0.5 1 1.5 a 14.27 i 3 discharge current high tdev 5.5 8 10.5 a 14.28 dev wth internal low threshold dwth, i 3 = 1 a - 20 - khz 14.29 dev wth internal high threshold dwth, i 3 = 1 a - 50 - khz 14.30 ratio min referred to threshold dth - 1 - 14.31 ratio max referred to threshold dth - 1.5 - 15. weak signal mute 15.1 v 37 upper start point wmth = 0, wmd = 7, v in =v 56 , af = -3 db -2.9 - v 15.2 v 37 lower start point wmth = 7, wmd = 7, v in =v 56 , af = -3 db -2.7 - v 15.3 a wmd min. mute depth wmd = 0, wmth = 7, v 56 =off 10 14 - db 15.4 a wmd max. mute depth wmd = 7, wmth = 7, v 56 =off 22 26 - db 15.5 a mthiss mute threshold below wmth for iss filter ?on? wmd, wmth, v in =v 56 -1 -db 15.6 v acmth internal ac mute threshold acmth 40 - 260 mv 15.7 a acmd ac mute depth acmd 3 - 8 db 15.8 i 42 charge current - -65 -47.5 -30 a 15.9 i 42 discharge current - 1.5 2.5 4 a 16. multiplexer output 16.1 v 23 output voltage low - - 0.1 0.2 v 16.2 v 23 output voltage high - 4.6 4.9 - v 16.3 r out output resistance - 200 250 300 16.4 r 23load load resistor - 20 - - k table 6. fm section (continued) item symbol parameter test co nditions min. typ. max. unit TDA7541B electrical specifications and characteristics doc id 16048 rev 1 17/77 3.3.3 am section t amb = 25 c, v cc1 = v cc2 = v ccmix1 = v ccvco = v ccif = 8.5 v, f xtal = 10.25 mhz, f rf = 1 mhz, m = 30%, f mod = 1 khz, in application circ uit, unless othe rwise specified. table 7. am section item symbol parameter test conditions min. typ. max. unit 17. global 17.1 v ant_us usable sensitivity (1) (s+n)/n = 26 db - 19 25 dbv 17.2 (s+n)/n signal to noise ratio ref.: v 3 = 80 dbv 50 55 - db 17.3 a if if1 rejection s/n = 26 db, m = 30 %, f mod = 1 khz 70 80 - db 17.4 v 3 min. rf agc threshold rfagc - 92 - dbv 17.5 v 3 max. rf agc threshold - 104 - dbv 17.6 v 61 min. if agc threshold ifagc - 78 - dbv 17.7 v 61 max. if agc threshold - 102 - dbv 17.8 v 56 min. dagc threshold dagc - 86 - dbv 17.9 v 56 max. dagc threshold - 98 - dbv 18. agc voltage driver output 18.1 v 4 max. agc output voltage - 3.3 3.5 - v 18.2 v 4 min. agc output voltage - - - 0.5 v 18.3 | i 4 | agc current v 4 = 0 v, v 54 = 3.5 v, lna?00? - 340 - a 19. agc pin diode driver output 19.1 i 7 agc driver current - - - -15 ma 20. am mixer1 (10.7 mhz) 20.1 r in input resistance differential 45 - - k 20.2 c in input capacitance differential - 2.5 - pf 20.3 r out output impedance - 530 660 790 20.4 cp 1db 1db compression point referred to diff. mixer input - 112 - db v 20.5 v 3,6 input dc bias - 0.3 0.4 0.55 v 20.6 iip3 3 rd order intermodulation - - 132 - db v 20.7 inoise equivalent input noise - - 5.5 - nv/ hz 20.8 g gain with 330 filter 35.57 db 21. am mixer2 21.1 r in input resistance - 240 300 360 21.2 c in input capacitance - - 2.5 - pf 21.3 v 55.56 dc input voltage - 3.8 4 4.2 v 21.4 r out output resistance - 100 - - k electrical specifications and characteristics TDA7541B 18/77 doc id 16048 rev 1 21.5 c out output capacitance - - 2.5 - pf 21.6 v 52,53 dc output voltage - 3.7 4.0 4.3 v 21.7 g m conversion transconductance mix2out - 440 - a/v 21.8 g max max. gain l = 560 h, q = 28; c = 180 pf, referred to mix2out -26- db 21.9 g gain control range - - 20 - db 21.10 c step min. cap. step if2a - 2.2 - pf 21.11 c max max. cap. if2a - 33 - pf 21.12 inoise equivalent input noise voltage, including buffer mixer2 a max , r gen = 330 , r l = 2 k , noise of r gen not included -11- nv/ h z 21.13 cp 1db 1db compression point a max , referred to 330 input -114- db v 21.14 iip3 3 rd order intermodulation a max , referred to 330 input -132- db v 22. buffer am mixer2 22.1 r out output resistance - 1.6 2 2.4 k 22.2 c out output capacitance - - 2.5 - pf 22.3 v 50 dc output voltage - 3.7 4.0 4.3 v 22.4 g gain r l = 2 k -8 -6 -4 db 23. am if2 amplifier 23.1 r in input resistance - 1.6 2 2.4 k 23.2 c in input capacitance - - 2.5 - pf 23.3 v 44,47 dc input voltage - 4.1 4.3 4.5 v 23.4 g max max. gain - 495255 db 23.5 g gain control range - 36 38 40 db 23.6 inoise equivalent input noise voltage g max , r gen = 2 k , noise of r gen not included -9.5- nv/ hz 23.7 cp 1db 1 db compression point g max , referred to 2 k input -74- db v 23.8 iip3 3 rd order intermodulation g max , referred to 2 k input -100- db v 23.9 v 23 if2 output voltage v 56 = 90 dbv, m = off 140 190 240 mv rms 24. amagc2 24.1 v agc(start) agc start voltage (pin47) input carrier voltage - 62 - dbv 24.2 agc agc2 range between start of agc2 and the intervention point of prestage agc 50 55 - db 24.3 g agc control slope seek mode - 50 - a/v table 7. am section (continued) item symbol parameter test conditions min. typ. max. unit TDA7541B electrical specifications and characteristics doc id 16048 rev 1 19/77 3.3.4 stereo decoder section t amb = 25 c, v cc1 = v cc2 = v ccmix1 = v ccvco = v ccif = 8.5 v, f xtal = 10.25 mhz, v mpx = 500 mv rms mono, f = 1 khz, de-emphasis = 50 s, in applicat ion circuit, unless otherwise specified. 24.4 g agc control slope normal mode - 5 - a/v 24.5 ii 57 i max. agc charge current seek mode - 125 - a 24.6 ii 57 i max. agc charge current normal mode - 5 - a 24.7 v 57 max. agc output voltage v 47 = 100 db 4.6 4.8 - v 24.8 v 57 min. agc output voltage v 47 = 20 db - 0.2 0.5 v 25. am audio output 25.1 v 43 audio output voltage v 56 = 90 db, m = 30 %, f mod = 1khz 170 200 230 mv rm s 25.2 thd total harmonic distortion v 56 = 90 db, m = 30 %, f mod = 1 khz -0.30.5 % 25.3 v 56 = 90 db, m = 80%, f mod = 1 khz -0.50.9 25.4 r out output impedance - 20 25 30 26. if noise blanking 26.1 t bl min. blanking time - - 8 - s 26.2 t bl max. blanking time - - 17 - s 26.3 v th min internal threshold - - 50 - mv 26.4 v th max. internal threshold - - 187.5 -mv 26.5 v thstep threshold step - - 12.5 - mv 1. can be reached in applicat ion circuit, not measured. table 7. am section (continued) item symbol parameter test conditions min. typ. max. unit table 8. stereo decoder section item symbol parameter test co nditions min. typ. max. unit 27. stereo decoder 27.1 v in mpx input level --0.50.93 v rms 27.2 wbon = 1 - 0.05 0.06 27.3 r in input resistance - 80 100 120 k 27.4 g std stereo decoder gain - 2 2.5 3 db 27.5 g stdwb stereo decoder gain weather band mode 23 26 27 db 27.6 svrr supply voltage ripple rejection v ripple = 100 mv, f = 1 khz - 60 - db electrical specifications and characteristics TDA7541B 20/77 doc id 16048 rev 1 27.7 a channel separation v mpx = 500 mv rms stereo, only l/r, roc adjusted 35 40 - db 27.8 thd total harmonic distortion - - 0.02 0.3 % 27.9 (s+n)/n signal plus noise to noise ratio a-weighted, 19 khz notch - 85 - db 28. mono/stereo switch 28.1 v pthst1 pilot threshold voltage for stereo, pth = 1 5 8 12 mv rms 28.2 v pthst0 pilot threshold voltage for stereo, pth = 0 7 11 16 mv rms 28.3 v pthmo1 pilot threshold voltage for mono, pth = 1 3.5 6 10 mv rms 28.4 v pthmo0 pilot threshold voltage for mono, pth = 0 6 9 14 mv rms 29. 19khz pll 29.1 f lock capture range pilot magnitude 20 mv rms = 4 % 18.9 - 19.1 khz 29.2 dp pilot deviation range f pilot = 19 khz 4 - 30 % 30. de-emphasis and high cut 30.1 t hc50 de-emphasis time constant deemp=0, high cut off 45 50 55 s 30.2 t hc75 de-emphasis time constant deemp = 1, high cut off 67 75 83 s 30.3 t hc50 high cut time constant deemp = 0, high cut on, v 28 =0.1v 135 150 165 s 30.4 t hc75 high cut time constant deemp= 1, high cut on, v 28 = 0.1 v 200 225 250 s 30.5 a ammin min. attenuation in am voutmax/vout@ f = 3.5 khz, deemp = 0, amcf ?111? -3.6- db 30.6 a ammax max. attenuation in am voutmax/vout@ f = 3.5 khz, deemp= 0, amcf ?000? -8-db 31. stereo blend and high cut control 31.1 lg min min. level gain lg -0.3 0 0.3 db 31.2 lg max max. level gain lg 7.75 8.25 8.75 db 31.3 lg step level gain step resolution - 0.25 0.55 0.85 db 31.4 vsbl min min. voltage for mono sbc 24 29 34 %v ref1 31.5 vsbl max max. voltage for mono sbc 53 58 63 %v ref1 31.6 vsbl step step resolution sbc 3.5 4.2 5 %v ref1 31.7 vhch min min. voltage for no high cut hcht 374247%v ref1 31.8 vhch max max.voltage for no high cut hcht 616671%v ref1 table 8. stereo decoder section (continued) item symbol parameter test co nditions min. typ. max. unit TDA7541B electrical specifications and characteristics doc id 16048 rev 1 21/77 31.9 vhch step step resolution hcht 7 8 9 %v ref1 31.10 vhcl min min. voltage for full high cut hclt 6 11 16 %vhch 31.11 vhcl max max. voltage for full high cut hclt 28 33 38 %vhch 31.12 vhcl step step resolution hclt 6.5 7.3 8.1 %vhch 32. carrier and harmonic suppression at the output 32.1 a19 pilot signal f = 19 khz - 45 50 - db 32.2 a38 subcarrier f = 38 khz - - 75 - db 32.3 a57 subcarrier f = 57 khz - - 62 - db 32.4 a76 subcarrier f = 76 khz - - 90 - db 33. intermodulation (1) 33.1 a2 f mod = 10 khz, f spur =1 khz - - 65 - db 33.2 a3 f mod = 13 khz, f spur =1 khz - - 75 - db 34. traffic radio (2) 34.1 a57 signal f = 57 khz - 65 70 - db 35. sca (3) 35.1 a67 signal f = 67 khz - - 75 - db 36. aci ? adjacent channel interference (4) 36.1 a114 signal f = 114 khz - - 95 - db 36.2 a190 signal f = 190 khz - - 84 - db 37. fm noise blanker 37.1 v trmin min. trigger threshold (5) v peak =0.8 v, nblt ?111? - 147 - mv op 37.2 v trmax max. trigger threshold (5) v peak =0.8 v, nblt ?000? - 280 - mv op 37.3 v trnoise min. noise controlled trigger threshold v peak = 1.5 v, nbct ?11? - 450 - mv op 37.4 v trnoise max. noise controlled trigger threshold v peak = 1.5 v, nbct ?00? - 1200 - mv op 37.5 v peak peak voltage nbrr ?00?, v mpx = 0 mv - 0.8 - v 37.6 v peak peak voltage nbrr ?00?, v mpx = 50 mv, f = 150 khz -1.9- v 37.7 v peak peak voltage nbrr ?00?, v mpx = 200 mv, f = 150 khz -3.5- v 37.8 v peakdev min. deviation dependent peak voltage v mpx = 500 mv, nbdc = 11 (?off?) -0.8- v 37.9 v peakdev max. deviation dependent peak voltage v mpx = 500 mv, nbdc= 00 - 2.0 - v table 8. stereo decoder section (continued) item symbol parameter test co nditions min. typ. max. unit electrical specifications and characteristics TDA7541B 22/77 doc id 16048 rev 1 37.10 v peakfs min. fieldstrength controlled peak voltage v mpx =0mv, v level << v sbl (fully mono), nbfc = 11 (?off?) -0.8- v 37.11 v peakfs max. fieldstrength controlled peak voltage v mpx =0mv, v level << v sbl (fully mono), nbfc = 00 -2.0- v 37.12 t s min. blanking time signal holdn in testmode, nbt = 00 -38- s 37.13 t s max. blanking time signal holdn in testmode, nbt = 11 -22- s 37.14 sr peak noise rectifier charge signal peak in testmode, nbpc =0 -5- mv/ s 37.15 sr peak noise rectifier charge signal peak in testmode, nbpc=1 -12- mv/ s 37.16 v rectadj noise rectifier discharge adjustment signal peak in testmode, nbrr=00 - 0.3 - v/ms 37.17 v rectadj noise rectifier discharge adjustment signal peak in testmode, nbrr=01 - 1.8 - v/ms 37.18 v rectadj noise rectifier discharge adjustment signal peak in testmode, nbrr=10 - 2.8 - v/ms 37.19 v rectadj noise rectifier discharge adjustment signal peak in testmode, nbrr=11 -4-v/ms 37.20 v adjmp noise rectifier adjustment by multipath signal peak in testmode, v mptc =1v, nbsmp=0, nbmp=1, nbrr=01 -3-v/ms 37.21 v adjmp noise rectifier adjustment by strong multipath influence signal peak in testmode, v mptc = 1v, nbsmp = 1, nbmp = 0, nbrr = 01 -4-v/ms 37.22 v adjmp noise rectifier adjustment by multipath and strong multipath influence signal peak in testmode, v mptc =1 v, mbsmp=1, nbmp=1, nbrr=01 - 5.2 - v/ms 38. multipath detector 38.1 g mp min. multipath gain mpg = 00 5 6 7 db 38.2 g mp max. multipath gain mpg = 11 11 12 13 db 38.3 g rectmp min. rectifier gain mprg = 01 -1 0 1 db 38.4 g rectmp max. rectifier gain mprg = 11 5 7.6 9 db 38.5 i chmp rectifier charge current mpcc = 0 0.5 0.8 1.1 a 38.6 i chmp rectifier charge current mpcc = 1 0.2 0.4 0.7 a 38.7 i dismp rectifier discharge current 0.5 1 - ma 39. quality detector 39.1 a min. quality detector coefficient qdc 0.5 0.6 0.7 - table 8. stereo decoder section (continued) item symbol parameter test co nditions min. typ. max. unit TDA7541B electrical specifications and characteristics doc id 16048 rev 1 23/77 39.2 a max. quality detector coefficient qdc 0.9 1.05 1.2 - 39.3 b min. quality noise gain qng 5 6 7 db 39.4 b max. quality noise gain qng 13 15 17 db 1. intermodulation suppression measured with: 91 % stereo signal; 9 % pilot signal; fm = 10 khz or 13 khz. 2. traffic radio (v .f.) suppression measured with: 91% stereo signal; 9% pilot signal; fm=1 kh z; 5% sub carrier (f=57 kh z, fm=23 hz am, m=60 %) 3. sca (subsidiary communications authorization) measured with: 81 % mono signal; 9 % pilot signal; fm=1 khz; 10 % sca - sub carrier (f s = 67 khz, unmodulated) 4. aci (adjacent channel interference) measured with: 90 % mono signal; 9 % pilot signal; fm=1 khz; 1% spurious signal (f s = 110 khz or 186 khz, unmodulated) 5. all thresholds are measured in test mode at t he quality output. the thresholds are calculated by v nbth - v peak . v peak can be adjusted by applying a 150 khz sinewave at mpxin. table 8. stereo decoder section (continued) item symbol parameter test co nditions min. typ. max. unit a2 v o signal @1 khz , () v o spurious @1 khz , () --------------------------------------------------------------- ?s 2 10 khz () 19 khz ? () = ; = a3 v o signal @1 khz , () v o spurious @1 khz , () --------------------------------------------------------------- ?s 3 13 khz () 38 khz ? () = ; = a57 v w f , , () v o signal @1 khz , () v o spurious @1 khz , () 23 khz ------------------------------------------------------------------------------------------ = a67 v o signal @1 khz , () v o spurious @9 khz , () --------------------------------------------------------------- ?s 2 38 khz () 67 khz ? () = ; = a114 v o signal @1 khz , () v o spurious @4 khz , () --------------------------------------------------------------- ?s 110 khz 2 38 khz () ? () = ; = a190 v o signal @1 khz , () v o spurious @4 khz , () --------------------------------------------------------------- ?s 186 khz 5 38 khz () ? () = ; = electrical specifications and characteristics TDA7541B 24/77 doc id 16048 rev 1 3.3.5 pll section t amb = 25 c, v cc1 = v cc2 = v ccmix1 = v ccvco = v ccif = 8.5 v, f xtal = 10.25 mhz, v mpx = 500 mv rms mono, f = 1 khz, de-emphasis = 50 s, in applicat ion circuit, unless otherwise specified. table 9. pll section item symbol parameter test conditions min. typ. max. unit 40. voltage controlled oscillator (vco) 40.1 f vcomin min. vco frequency - 160 - - mhz 40.2 f vcomax max. vco frequency - - - 260 mhz 40.3 c/n carrier-to-noise-ratio f vco = 200 mhz, f=1 khz, b = 1 hz, q loaded =60 -80-dbc/ hz 41. crystal oscillator 41.1 f xtal crystal frequency - - 10.25 - mhz 41.2 c/n carrier-to-noise-ratio f xtal =10.25 mhz, f=10 khz 110 - - dbc/ hz 41.3 v 29 oscillator output voltage - - 400 - mv rms 41.4 c 29-32 input capacitance - - 2.5 - pf 41.5 c step min. cap. step xtal - 0.75 - pf 41.6 c max max. cap. xtal - 23.25 - pf 41.7 f/f deviation versus v cc v cc =1 v - 1.5 - ppm/v 41.8 f/f deviation versus t -40 c functional description TDA7541B 26/77 doc id 16048 rev 1 4 functional description 4.1 fm part 4.1.1 mixer 1 agc and if amplifier fm quadrate i/q-mixer converts fm rf to if1 of 10.7 mhz. the mixer provides inherent image rejection and wide dynamic range with low noise and large input signal performance. for accurate image rejection the phase-error of i/q can be compensated by software (ph). it is capable of tuning the us fm, us weather (dedicated wb input), europe fm, japan fm and east europe fm bands: ? us fm = 87.9 to 107.9 mhz ? us weather = 162.4 to 162.55 mhz ? europe fm = 87.5 to 108 mhz ? japan fm = 76 to 91 mhz ? east europe fm = 65.8 to 74 mhz the agc operates on different sensitivities and bandwidths in order to improve the input sensitivity and dynamic range. agc thresholds are programmable by software (rfagc, ifagc, and kagc). the output signal is a controlled current for pin diode attenuator. a 10.7 mhz programmable amplifier (ifg) correct the if ceramic insertion loss and the costumer level plan application. 4.1.2 mixer2, limiter, fm de modulator and spike cancellation in the 2nd mixer stage the first 10.7 mhz if is converted into the second 450 khz if. the fully integrated sample and hold fm demodulator including spike cancellation (dsb) converts the if signal from the 450 khz limiter (limiter gain 80 db typ.) to the fm multiplex output signal with very low distortion. the sensitivity of spike blanking can be set via i 2 c bus. 4.1.3 quality detection and iss field strength parallel to mixer2 input a 10.7 mhz limiter generates a signal for digital if counter and field strength voltage v fsuint . this internal voltage v fsuint is used for am if noise blanker, adjacent channel and multi path detection and is available at pin27 (fsu) in a range of 0 v to 5 v. the offset and slope of fsu signal can be adjusted via i 2 c bus (fswo and sl) for application adaptation. the voltage vfswo including offset adjust is externally filtered at pin37 (fswo) and used for weak signal mute function and generation of iss filter control signals in weak signal condition. it is possible to combine the if counter result with this voltage vfswo by programmable comparator threshold (ssth). TDA7541B functional description doc id 16048 rev 1 27/77 adjacent channel detector the input of the adjacent channel detector is ac coupled from vfsw. a programmable high-pass or band-pass (acf) as well as rectifier generate a signal which is compared with adjustable threshold (acth). the output signals of this comparator is controlling the charge and discharge of the external capacitor at pin30 or pin31 (dependent on seek) with programmable discharge current (tiss). the level at pin30/31 is used to generate the two digital signal ac and ac+ for iss control. the adjacent channel information behind the rectifier is available as analog output signal at the multiplexer output (pin23). multipath detector the input of the multi path detector is ac coupled from internal vfsw too. after filtering with 19 khz band-pass and rectifying, this voltage is compared with an adjustable threshold (mpth). the output signal of this comparator can be used to switch off the adjacent channel detection. this influence is selectable by i 2 c bus (mpena). the multi path information behind the rectifier is available as analog output signal at multiplexer output (pin23). 450 khz if narrow band pass filter (iss filter) the device has an additional 450 khz if narrow band-pass filter for suppression of noise and adjacent channel signal influences. this narrow filter has three switchable bandwidths, narrow range of 80 khz, mid range of 120 khz and 22 khz for weather band information. without iss (intelligent selectivity system) filt er the if bandwidth ( wide range) is defined only by ceramic filter chain and mixer2 bandwidth. the filter is located between mixer2 output buffer and 450 khz limiter stage. the centre frequency is matched to the demodulator centre frequency. deviation detector in order to avoid distortion in audio output signal the narrow iss filter is switched off if over deviation is present. hence the demodulator outp ut signal is detected. after ac coupling, low-pass filtering and peak rectif ying this signal is charging/d ischarging the external devtc capacitor by an iic programmable charge/discharge current (tdev). the voltage at devtc is compared with adjustable thresholds (dwth, dth) and generates two digital control signals (dev, dev+). for weak signal condition the deviation threshold depends on fswo. iss switch logic all digital control signals coming from adjac ent channel detector, deviation detector and weak signal mute are acting via switching matrix on iss filter switch. if2 narrow band-pass switch mode is controlled also by softwa re (issena, isson, wbon, issbw, and bwdef). the switching of the if band-pass is also possible to influence by external manipulation of dc voltage at pin30. the influence of the iss software control on the functionality of the iss filter is described in ta bl e 1 0 . the value ?x? for the control bit means the bit does not influence the filter control in this condition. functional description TDA7541B 28/77 doc id 16048 rev 1 description of i 2 c bits: issena iss filter enable ?1?: iss filter control enabled ?0?: iss filter is switched of f (bypass of the filter, wide) isson iss filter control mode ?1?: iss filter is in manual control mode (switched "on"); the bits issbw and wbon are defining the bandwidth ?0?: iss filter is in automatic control mode according to mode1/2 table issbw iss filter band width ?1?: 80 khz table 10. iss filter control by i 2 c bus i 2 c control bits notes issena adr4/d2 isson adr11/d0 issbw adr7/d0 wbon adr11/d1 issm adr9/d7 bwdef adr7/d1 0xxxxxiss filter is switched off (bypass) 1 1 0 x x x iss filter is in manual cont rol mode, band width is 120 khz 1 1 1 x x x iss filter is in manual co ntrol mode, band width is 80 khz 11x1xx iss filter is in manual cont rol mode, band width is 22 khz this setting must be used for weather band application 10xx00 iss filter is in automatic control mode filter activation and band width defined by control table mode1 10xx10 iss filter is in automatic control mode filter activation and band width defined by control table mode2 100x01 iss filter is in automatic control mode filter activation defined by control table mode1 band width fixed to 120 khz 100x11 iss filter is in automatic control mode filter activation defined by control table mode2 band width fixed to 120 khz 101x01 iss filter is in automatic control mode filter activation defined by control table mode1 band width fixed to 80 khz 101x11 iss filter is in automatic control mode filter activation defined by control table mode2 band width fixed to 80 khz TDA7541B functional description doc id 16048 rev 1 29/77 ?0?: 120 khz the bit has only influence if bit bwena is ?1?, or if bit isson is ?1? wbon weather band enable ?1?: weather band enable (fmmixer1 is disabled, wbmixer1enabled, stereo decoder gain 26db, iss filter bandwidth 22 khz, if2q=?00?) ?0?: weather band disable for weather band enable it is need to set isson = ?1? issm iss filter application mode ?0?: iss filter application mode1 ?1?: iss filter application mode2 if bwena is ?1? the band width is always switched to issbw in case of iss filter activated bwdef enable bit issbw for iss filter band with control ?1?: iss filter is internally controlled, but band width is defined by bit issbw ?0?: iss filter is interna lly controlled, band width is defined by mode1/2 table for the internal control two application modes are available (issm). the conditions and settings are described in ta b l e 1 1 and ta bl e 1 2 . 4.1.4 block diagram qual ity detection principle (without overdeviation correction) table 11. internal iss control signals signal low high ac no adjacent channel adjacent channel present ac+ no strong adjacent channel adjacent channel higher as ac sm field strength higher as weak signal mute threshold field strength lower as weak signal mute threshold dev deviation lower as threshold dwth deviation higher as threshold dwth dev+ deviation lower as threshold dth*dwth deviation higher as threshold dth*dwth inton iss filter off by logic (wide) iss filter on by logic int80 iss filter 120 khz (mid) iss filter 80 khz (narrow) functional description TDA7541B 30/77 doc id 16048 rev 1 4.1.5 strong adjacent channel correction under strong adjacent channel it is possible to have disturbance of the audio signal created by interference between iss filter control (deviation detection) and adjacent channel mute. the control bits sacce and sacct can be used to avoid this disturbance. if the function is activated (sacce = ?1?) the if counter together with the internal field strength is used to suppress a malfunction of deviation detection. the bit sacct is changing the sensitivity of the sacc block (sacct = ?1? means higher sensitivity). figure 10 shows the iss block diagram including the sacc function. note: the if counter must be switched on if this function is used (addr25d4 = ?1?) 4.1.6 weak signal mute the filtered field strength signal (fswo) is the reference for soft slope mute control in weak signal condition to eliminate audible effects. the start point and mute depth are programmable (wmth, wmd) in a wide range. these settings together with fswo bits are influencing the weak signal mute behavior. the time constant is defined by external capacitance at pin 42. additional adjacent chan nel mute function is supported. a high pass filter with -3 db threshold frequency of 100 khz, amplifier and peak rectifier generates an adjacent noise signal from demodulator output. this value is compared with adjustable threshold (acmth). for present strong adjacent channel the mpx signal is additional attenuated (acmd) and has the same time constant as weak signal mute. table 12. iss control modes input signals mode1 mode2 ac ac+ sm dev dev+ inton int80 function inton int80 function 0000000wide0 0wide 0001000wide0 0wide 0001100wide0 0wide 0010011narrow1 1narrow 0011000wide1 0 mid 0011100wide0 0wide 1000011narrow1 0 mid 1100011narrow1 1narrow 1001010mid 1 0 mid 1101110mid 1 1narrow TDA7541B functional description doc id 16048 rev 1 31/77 4.1.7 weather band input if the weather band input is used the chip must be set in fm mode (fmon). in addition to that the iss filter must be switched on (issen a=?1?), mixer2 quality fa ctor must be set to if2q=?00? and the iss filter must be set in manual control mode (isson=?1?). the bit wbon is: activating the wb input switching the iss filter in wb mode (22 khz band width) switching the stereo decoder ingain to 26 db. in order to increase the selectivity in weather band mode the am 450khz ceramic filter can be used in series to the iss filter by activating adsel (please refer to figure 10 , iss block diagram and section 4.2.1 , usage of bit adsel). 4.2 am section signals, narrow band information (dagc) referred to pin 56, up conversion signal (ifagc) at pin 61 and wide band information (rfagc) at pin 3.this gain control gives two output signals. the first one is a current for pin diode attenuator and the second one is a voltage for preamplifier. time constant of rf and if-agc is defined by internal 100 k resistor and external capacitor at pin 54. the interventio n points for agc (dagc, ifagc and rfagc) are programmable by softwa re. the oscillator frequency for upconversion-mixer1 is generated by dividing the vco frequency after vco divider (vcod) and am pre-divider (amd). two 10.7 mhz ceramic filters before mixer2 input increase 900 khz attenuation. the amif2 block contains mixer2, if2 amplifier, demodulator and agc2 the am/fm mixer2 converts 10.7 mhz if1 into 450 khz if2. mixer2 output passes a 450 khz narrow band filter (lc plus ceramic filter). lc centre frequency is adjustable by i 2 c bus (if2a). the following if2 amplifier provides signal for fully integrated demodulator. if the bit adsel is activated, the iss filter is inserted between if2 amplifier and demodulator in order to increase the selectivity (please refer to figure 11 , am path block diagram and section 4.2.1 , usage of bit adsel). mixer2 and if2 amplifier have a 2-stage agc with careful take-over behavior to keep distortion low. the if2 agc range is about 55 db. the input signal of if2 amplifier is used in limiter circuit for in-band level detection. the electrical characteristics ar e described in fm section. the demodulator is a peak detector to generate the audio output signal. at the mux output the amif stereo is available. am if noise blanker in order to remove in am short spikes a noise cancellation conception is used in 450 khz if am level. the advantage is to avoid long narrow agc- and demodulator- time constants, which enlarge spike influences on audio signal and makes difficult to remove it in audio path. the 10.7 mhz am if signal behind if1 amplifier generates via limitation an unweighted field strength signal including slope of noise spik e. the comparison of this detected slope between fast and slow rectifier ignores audio modulation whereby the threshold of slow functional description TDA7541B 32/77 doc id 16048 rev 1 rectifier is programmable (ainbt). a comparator activates a pulse generator. the duration of this pulse is software programmable (aint) and is smooth blanking out the spikes in mixer2. 4.2.1 usage of control bit adsel (addr23d7) the control bit adsel can be used to increase the selectivity of the application in am mode and wb mode. in fm it has no function. table 12 shows the functionality of the control bit. 4.3 stereo decoder 4.3.1 decoder the stereo decoder-part of the TDA7541B contains all functions necessary to demodulate the mpx-signal, like pilot tone-dependent mono/stereo switching as well as the stereo blend and high cut. adaptations like programmable input gain, ro ll-off compensation, se lectable de-emphasis time constant and a programmable field strength input allow easy adoption to different applications. the 4 th order input filter has a corner frequency of 80 khz and is used to attenuate spikes and noise and acts as an anti-aliasing filt er for the following swit ch capacitor filters. demodulator in the demodulator block the left and the right channel are separated from the mpx-signal. in this stage also the 19 khz pilot tone is ca nceled. for reaching a high channel separation the TDA7541B offers an i 2 c bus programmable roll-off adju stment, which is able to compensate the low pass behavior of the tuner section. within the compensation range an adjustment to obtain about 40 db channel separation is possible. the bits for this adjustment are located together with the level gain adjustment in one byte. this gives the table 13. usage of adsel fmon wbon adsel note addr4d7 addr11d1 addr23d7 1 0 x standard fm mode 11 0 weather band mode using 450 khz ceramic filter; iss filter must be manually switched on in order to limit the band width at 450 khz if (issena/isson = "1"); 450 khz ceramic filter is switched in series to iss filter to increase selectivity 11 1 standard weather band mode; iss filter must be manually switched on in order to limit the band width at 450 khz if (issena/isson = "1") 0 0 0 standard am mode 00 1 am mode using iss filter; iss filter (22 khz band width) is switched in series to the 450 khz ceramic filter 01 xnot allowed TDA7541B functional description doc id 16048 rev 1 33/77 possibility to perform an optimization step dur ing the producti on of the car radio where the channel separation and the field strength control are trimmed. in addition to that the fm signal can be inverted. de-emphasis and high cut the de-emphasis low pass allows to choose between a time constant of 50 s/75 s (deemp). the high cut control range will be in both cases t hc = 2 x t deemp . inside the high cut control range (betwe en vhcht and vhclt) the level sign al is converted into a 5-bit word, which controls the low pass time constant between t deemp ...3 x t deemp . thereby the resolution will remain 5 bits referred to the voltage range between th e vhcht- and minimum vhclt-values. the high cut function can be switched off by i 2 c-bus. figure 3. programming of hc filter in am mode (fmon = 0) the deemp bit together with the am corner frequency bits (amcf) can be used as programmable am frequency response. the maximum corner frequency is defined by t deemp , the minimum is defined by 3 x t deemp for the over all frequency response it is need to take into account the frequency response of the af output at mpxout and the stereo decoder demodulator too. 19 khz pll and pilot tone detector the pll has the task to lock on the 19 khz pilot tone during a stereo-transmission to allow a correct demodulation. the included pilot tone-detector enables the demodulation if the pilot tone reaches the selected pilot tone threshold vpthst. two different thresholds are available. the status of the detector output can be checked by reading the status byte of the TDA7541B via i 2 c bus or by reading the stereo status at mux pin23. field strength control the field strength input is used to control the high cut- and the stereo blend-function. in addition the signal can be also used to control the noise blanker thresholds and as input for the multipath detector. level input and gain as level input for the stereo decoder is used the fsu voltage (pin 27). applying a capacitor at fstc (pin28) a desired time constant can by reached together with the internal resistor of high cut filter time constant 3*t deemp t deemp hcmax 00 11 01 v hclt v hcht v fstc* lg functional description TDA7541B 34/77 doc id 16048 rev 1 10k between fsu pin and fstc pin. the second stage is a programmable gain stage to adapt the vfstc signal internally. the gain (lg) is widely programmable in 16 steps from 0 db to 8.25 db (step=0.55db). t hese 4 bits are located together with the roll-off compensation bits in byte 14 to simplify a possible adaptation during the production of the car radio. stereo blend control the stereo blend control block converts the internal level-voltage into a demodulator compatible analog signal, which is used to control the channel separation between 0db and the maximum separation. internally this control range has a fixed upper limit, which is the internal reference voltage vref1. the lower limit can be programmed between 29 and 58 % of vref1 in 4 % steps. in order to adjust the external voltage vfstc to the internal control range two values must be defin ed: the level gain lg and vsbl. full channel separation is reached when the internal level voltage (vst) becomes bigger than vref1. therefore the following equation can be used to estimate the gain: the mono-voltage vmo (0db channel separation) can be chosen selecting sbc. figure 4. programming of stereo blend high cut control the high cut control set-up is similar to the stereo blend control set-up: the starting point vhch can be set with 2 bits to be 42, 50, 58 or 66 % of vref1 whereas the range can be set to be 11, 18.3, 25.7 or 33 % of vhch. 4.3.2 noise blanker in the automotive environment spikes produced for example by the ignition or the wiper- motor disturb the mpx-signal. the aim of the no ise blanker part is to cancel the audible influence of the spikes. therefore the output of the stereo decoder is held at the actual voltage for a time between 22 ms and 38 ms (programmable). in a first stage the spikes must be detected but to avoid a wrong triggering on high frequency (white) noise a complex trigger control is implemented. behind the trigger stage a pulse former generates the "blanking"-pulse. an own biasing circuit supplies the noise blanker in order to avoid any cross talk to the signal path. lg v ref1 v fstc @ fullstereo ---------------------------------------------------- = TDA7541B functional description doc id 16048 rev 1 35/77 trigger path the incoming fm demodulator output signal is taken in front of the weak signal mute, high pass filtered, amplified and rectified. this second order high pass filter has a corner- frequency of 140 khz. the rectified signal, vrect, is low pass filtered to generate a signal called v peak . noise with a frequency above 140 khz increases the v peak voltage. the resulting voltage can be adjusted by use of the noise rectifier discharge current. the v peak voltage is fed to a threshold generator, which adds to the v peak voltage a dc threshold vth. both signals, v rect and v peak +vth are fed to a comparator, which triggers a re- triggerable monoflop. the output of the monoflop activates the sample-and-hold circuit in the signal path for the selected duration. automatic noise controlled threshold adjustment there are mainly two independent possibilities for prog ramming the trig ger threshold: 1. low threshold in 8 steps (nblt) 2. noise adjusted thresh old in 4 steps (nbct). the low threshold is active in combination with a good mpx signal without any noise; the v peak voltage is less than 1v. the sensitivity in this operation is high. if the mpx signal is noisy (low field strength) the v peak voltage increases due to the higher noise, which is also rectifi ed. with increasing of the v peak voltage the trigger threshold increases, too. this particular gain is programmable in 4 steps (nbct). figure 5. adaptive threshold control of noise blanker automatic stereo blend controlled threshold adjustment besides the noise controlled th reshold adjustment there is an additional possibility for influencing the noise blanker trigger threshold using the bits nbfc. this influence depends on the stereo blend control. the point where the mpx signal starts to become noisy is fixed by the rf part. this point is also the starting point of the normal noise-controlled trigger adjustment. but in some cases the noise blanker can create a wrong triggering, which create distortion, already in the region of mono/stereo transition. therefore an opportunity to control the v peak voltage by the stereo blend function it is implemented. vth min. trig. threshold noise controlled trig. threshold 0.8 v 1200 mv (00) 950 mv (01) 700 mv (10) 450 mv (11) 8 steps 200 mv 147 mv v peak 1.5 v functional description TDA7541B 36/77 doc id 16048 rev 1 figure 6. stereo blend controlled threshold adjust automatic deviation controlled threshold adjustment if the system is tuned to stations with a high deviation the noise blanker can trigger on the higher frequencies of the modulation. to avoid this wrong behavior, which causes noise in the output signal, the noise blanker offers a deviation-dependent threshold adjustment. by rectifying the mpx signal a further signal repres enting the actual deviation is obtained. it is used to increase the peak volt age. the gain of this circui t is programmable in 3 steps (nbdc) of the stereo decoder-byte (the first step turns off the detector). figure 7. deviation controlled threshold adjust multipath influence on noise blanker to react on high repetitive spikes caused by a multipath-situation, the discharge-time of the v peak voltage can be decreased depending on the voltage-level at pin mptc. there are two ways to do this. a) switch on the linear influe nce of the multipath-level on the peak-signal. in this case the discharge slew rate is 1 v/ms. the slew rate is measured with r discharge = infinite and vmptc = 2.5 v b) activate a function, which switches to the 18k discharge resistor if the multipath- level is below 2.5 v. if multipath influence on noise blanker is switched on than mpf bit has to be set to 0. 0.8v noisy signal good signal noise 2.0v (00) mono stereo 1.6v (01) 1.4v (10) atc_sb off (11) e' v peak 3v 0.8 deviation [khz] 2.0 1.5 1.0 20 32.5 45 75 v peak 00 01 10 detector off 11 [v ] op TDA7541B functional description doc id 16048 rev 1 37/77 noise blanker in am mode in am mode the noise blanker is activated if a spike on the audio signal is bigger than a fixed threshold. in order to blank the whole spike in am mode the hold time of the s&h circuit is much longer than in fm mode (64 0s -1,2 ms). it is not recommended to use the am noise blanker without to use the amif noise blanker inside the tuner. 4.3.3 functional description of the multipath detector using the internal multi path detector the audible effects of a multi path condition can be minimized. a multi path condition is detected by rectifying the 19 khz spectrum in the field strength signal. an external capacitor is used to define the attack- and decay-times. the mptc pin is used as detector output connect ed to a capacitor. using this configuration an external adaptation to the user's requirement is possible without affecting the "normal" field strength input (fstc) for the stereo decoder. to keep the old value of the multi path detector during an alternative frequency jump, the mpfast bit can disconnect the external capacitor. selecting mpint the channel separation is automatically reduced during a multipath condition according to the voltage appearing at the mptc pin. to obtain a good multipath performance an adaptation is necessary. therefore the gain of the 19 khz band pass is programmable in four steps (mpg) and the rectifier gain is programmable in four steps (mprg). the attack- and decay-times can be set by the external capacitor value and the multipath detector charge current mpcc. 4.3.4 quality detector the TDA7541B offers a quality detector output, which gives a voltage representing the fm- reception conditions. to calculate this voltage the mpx-noise and the multipath-detector output are summed according to the following formula: the v peak signal is described in noise blanker session. the factor 'a' can be programmed from 0.6 to 1.05 (qdc) and the factor b can be programmed from 6 db to 15 db (qng). the quality output voltage can be read at the mux pin. the mux pin is a low impedance output and is able to drive external circuitry as well as simply fed to an ad-converter for rds applications. 4.3.5 afs control and stereo decoder mute in case of afs (alternative frequency search) jump it is recommended to set the stereo decoder in mute condition (sdm) and in ad dition to set the seek mode. since these two bits are placed in the first written byte, this can be done in the same write cycle as the pll jump. the stereo decoder mute is high impedance mute, which means the charge on the coupling capacitor will be kept. simultaneously the pilot dete ctor circuit of the stereo decoder is switched into hold mode. the seek mode is swit ching the multi path detector into fast mode. the external capacitor at mptc is disconnected from multipath detector which keeps the stereo blend condition, but makes the quality information in fast mode available at the mux pin. v qual 0.8 b v peak 0.8 ? () av ref1 v mptc ? () ? + ?? = functional description TDA7541B 38/77 doc id 16048 rev 1 4.4 pll and if counter section 4.4.1 pll frequency synthesizer block this part contains a frequency synthesizer and a loop filter for radio tuning system. only one vco is required to build a complete pll system for fm world tuning and am up conversion. vco and dividers the varactor tuned lc oscillator together with the di viders provides the lo cal oscillator signal for both am and fm front-end mixers. the vco has an operating frequency of approximately 160 mhz to 260 mhz. in fm mode the vco frequency is divided (vcod) by 1, 2 or 3. these dividers generate in-phase and quadrature-phase output signals using in fm mixer for image rejection. in am mode the divided vco frequency is addi tional pre-divided (amd) by 4, 6, 8 or 10 dependent on selected am band. pll frequency generation for phase comparison the vco divided signals applies a two modulus counter (32/33), which is controlled by a 5- bit a-divider. the 5-bit register (pc0 to pc4) controls this divider. in parallel the output of the swallow counter is connected to an 11-bit b-divider. the 11-bit pc register (pc5 to pc15) controls this divider. dividing range behind vco divider: warning: for correct operation: a 32; b a crystal oscillator the crystal oscillator provides 10.25 mhz signal for conversion from if1 to if2 as well as switching signals for iss- and quality detection filter. furthermore reference dividers generate from adjustable crystal frequency (xtal) reference frequencies for the tuning pll, if counter and fm demodulator. the various reference frequencies f ref of pll (rc) can be chosen by iic-bus. three state phase comparator the phase comparator generates a phase error signal according to phase difference between f syn and f ref . this phase error signal drives the charge pump current generator. charge pump current generator this system generator signed pulses of curr ent. the phase error signal decides the duration and polarity of those pulses. the current absolute values are programmable by register icp. in lock detector after reaching a phase difference about lower th an 40 ns the inlock detector is automatically switching the charge-pump in low current mode (ldena). ? vcodiv 32 b ? a32 ++ [] ? ref ? = TDA7541B functional description doc id 16048 rev 1 39/77 low noise cmos op-amp an internal voltage divider at pin 19 connects the positive input of the low noise op-amp. the charge pump output connects the negative input. this internal amplifier in cooperation with external components can provide an active filter. the negative input is switchable to two input pins, to increase the flexibility in applicat ion. while the high curr ent mode is activated lphc output is switched on. antenna dac for tuning of fm antenna tank circuit two different modes are available (tvm). one is the auto-alignment measurement of vco tuning voltage with offset of 8-bit dac (tvo). the other one is an adjustment of 8-bit dac independent on pll tracking. for big differences between vco tuning voltage and antenna tank control voltage an additional constant offset voltage can be switched to antenna circuit (tvo+). 4.4.2 if counter block the aim of if counter is it to measure the intermediate frequency of the tuner. the input signals are the output level of 10.7 mhz if-limiter in fm and output level of 450 khz if- limiter in am. the grade of integration is adjustable by different measuring cycle times (ifs). the tolerance of the accepted count value is adjustable too (ew), to reach an optimum compromise for search speed and precision of the evaluation. sampling timer a sampling timer generates the gate signal for the main counter. the basically sampling time are in fm 6.25 khz (t tim = 160 s) and in am 1 khz (t tim = 1 ms). this is followed by an asynchronous divider to generate several sampling times. intermediate frequency main counter this counter is an 11 - 21-bit synchronous auto reload down counter. the counter length is automatic adjusted to the chosen sampling time and the counter mode (fm or am). at the start the counter will be loaded with a defined value which is an equivalent to the divider value (t sample x f if ). if a correct frequency is applied to the if counter frequency input at the end of the sampling time the main counter is changing its state. this is detected by control logic and an external search stop output is changing from low to high. the if counter is started only by the in lock information from the pll part. 4.5 i 2 c bus interface the TDA7541B supports the i 2 c bus protocol. this protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. the device that controls the transfer is a master and device being controlled is t he slave. the master will always initiate data transfer and provide the clock to transmit or receive operations. functional description TDA7541B 40/77 doc id 16048 rev 1 data transition data transition on the sda line must only occur when the clock scl is low. sda transitions while scl is high will be interpreted as start or stop condition. start condition a start condition is defined by a high to low transition of the sda line while scl is at a stable high level. this "start" condition must precede any command and initiate a data transfer onto the bus. the device continuously monitors the sda and scl lines for a valid start and will not response to any comm and if this condition has not been met. stop condition a stop condition is defined by a low to high transition of the sda while the scl line is at a stable high level. this condition terminat es the communication between the devices and forces the bus-interface of the de vice into the in itial condition. acknowledge indicates a successful data transfer. the transmitter will release the bus after sending 8 bits of data. during the 9 th clock cycle the receiver will pull the sda line to low level to indicate it receives the eight bits of data. data transfer during data transfer the device samples the sda line on the leading edge of the scl clock. therefore, for proper device operation the sda line must be stable during the scl low to high transition. device addressing to start the communication between two devices, the bus master must initiate a start instruction sequence, followed by an eight bit word corresponding to the address of the device it is addressing. the most significant 6 bits of the slave address are the device type identifier. the TDA7541B device type is fixed as "110001". the next significant bit is used to address a particular device of the previous defined type connected to the bus. the state of the hardwired pin 57 defines the state of this address bit. using this feature up to two devices could be connected on the same bus. when pin 57 is connected to vcc via an external resistor of about 82 k the address bit "1" is selected. please note: in this case the am part doesn't work. otherwise the address bit "0" is selected (fm and am is working). therefore a double fm tuner concept is possible. the last bit of the start instruction defines the type of operation to be performed: ? when set to "1", a read operation is selected ? when set to "0", a write operation is selected the TDA7541B connected to the bus will comp are their own hardwired address with the slave address being transmitted, after detecting a start condition. after this comparison, the TDA7541B will generate an "ack nowledge" on the sda line and will do either a read or a write operation according to the state of r/w bit. TDA7541B functional description doc id 16048 rev 1 41/77 write operation following a start condition the master sends a slave address word with the r/w bit set to "0". the device will generate an "acknowledge" a fter this first transmission and will wait for a second word (the word address field). this 8-bit address field provides an access to any of the 32 internal addresses. upon receipt of the word address the TDA7541B slave device will respond with an "acknowledge". at this time, all the following words transmitted to the TDA7541B will be considered as data. th e internal address will be automatically incremented. after each word receipt th e TDA7541B will answer wit h an "acknowledge". read operation if the master send s a slave address word with the r/w bit set to "1", the TDA7541B will transmit one 8-bit data word. this data word includes the following informations. bit0 (iss filter, 1 = on, 0 = off) bit1 (iss filter bandwidth, 1 = 80 khz, 0 = 120 khz) bit2 (stereo, 1 = stereo, 0 = mono) bit3 (1 = pll is locked in, 0 = pll is locked out). bit4 (fieldstrength indicator, 1 = lower as softmute threshold, 0 = higher as softmute threshold) bit5 (adjacent channel indicator, 1 = adjacent channel present, 0 = no adjacent channel) bit6 (deviation indicator, 1 = strong overdeviation present, 0 = no strong overdeviation) bit7 (deviation indicator, 1 = overdeviation present, 0 = no overdeviation) software specification TDA7541B 42/77 doc id 16048 rev 1 5 software specification 5.1 chip address and overview the interface protocol comprises: ? start condition (s) ? chip address byte ? sub address byte ? sequence of data (n bytes + acknowledge) ? stop condition (p) receive mode s110001d0ack00ia4a3a2a1a0ackdat abyteack p transmission mode s110001d1ackr7r6r5r4r3r2r1s0ack p s= start p= stop ack = acknowledge d = device address i = auto increment mode a = sub address r = read bit TDA7541B software specification doc id 16048 rev 1 43/77 5.2 address organization data bytes which are unused or dedicated for testing only don't need to be written, because they are set internally to feh (power on reset condition). but if somebody it writing these bytes they must be written to feh, otherwise some malfunction of the chip can happen. table 14. address organization function addr d7 d6 d5 d4 d3 d2 d1 d0 t pll charge pump 0 seek asfc lm sdm ldena icp2 icp1 icp0 t pll counter 1 pc7 pc6 pc5 pc4 pc3 pc2 pc1 pc0 t pll counter 2 pc15 pc14 pc13 pc12 pc11 pc10 pc9 pc8 t tv 3 tvo7 tvo6 tvo5 tvo4 tvo3 tvo2 tvo1 tvo0 t tv/if counter 4 fmon ew6 ew5 ifs4 ifs3 issena tvm tvo+ t pll divider 5 amd7 amd6 rc5 rc4 rc3 vcod2 vcod1 vcod0 t agc 6 lna7 lna6 dagc5 dagc4 ifagc3 ifagc2 rfagc1 rfagc0 t quality ac 7 tiss7 tiss6 tiss5 acth4 acth3 acf bwdef issbw t quality acm/mp 8 mpth7 mpth6 mpac mpena acmd acmth2 acmth1 acmth0 t quality dev 9 issm dth6 dth5 dwth4 dwth3 tdev2 tdev1 tdev0 t quality mux/fsu 10 ssth7 ssth6 ssth5 ssth4 sacct sacce mux1 mux0 t weak signal mute 11 wmd7 wmd6 wmd5 wmth4 wmth3 wmth2 wbon isson t am if nb 12 ifagcs aint6 aint5 ainth4 ainth3 aint h2 ainth1 ainena t xtal adjust 13 sl7 sl6 sl5 xtal4 xtal3 xtal2 xtal1 xtal0 t if adjust 14 if1g7 if1g6 if2q5 if2q4 if2a3 if2a2 if2a1 if2a0 t iq adjust/switch 15 dsb7 dsb6 swm sw ph3 ph2 ph1 ph0 t fm keying agc 16 fswo7 fswo6 rfk kagc4 kagc3 kagc2 odcur odena sd roll off 17 lg7 lg6 lg5 lg4 roc3 roc2 roc1 roc0 sd stereo blend 18 amcf7 amcf6 amcf5 asi pth sbc2 sbc1 sbc0 sd high cut 19 deemp hclt6 hclt5 hcht4 hcht3 hcmax2 hcmax1 hcena sd mp 20 ms mpfast mpint mpcc mprg3 mprg2 mpg1 mpg0 sd quality 21 nbfc7 nbfc6 nbdc5 nbdc4 qng3 qng2 qdc1 qdc0 sd audio nb i 22 nbct7 nbct6 nblt5 nblt4 nblt3 nbt2 nbt1 nbena sd audio nb ii 23 adsel pcm vcon nbsmp nbmp nbrr2 nbrr1 nbpc sd testing 24------ - - t pll/ifc testing 25 ewexp ifsexp 1 1 1 1 1 1 t testing 26------ - - t testing 27------ - - t testing 28------ - - t testing 29------ - - not used 30------ - - not used 31------ - - t tuner sd stereo decoder software specification TDA7541B 44/77 doc id 16048 rev 1 5.3 control register function table 15. i 2 c control bit description register name function acf adjacent channel detector filter select acmd adjacent channel mute depth acmth adjacent channel mute threshold acth adjacent channel detector threshold adsel additional selectivity ainena am if noise blanker enable aint am if noise blanking time ainth am if noise blanker threshold amcf stereo decoder attenuation @ 3.5 khz amd am vco pre-divider asfc alternative station frequency check in fm (agc and weak signal mute on hold) asi audio signal inversion bwdef enables bit issbw fo r iss bandwidth control dagc am narrow band agc threshold deemp stereo decoder de-emphasis dsb fm demodulator spike blanker dth deviation detector threshold for iss filter ?off? dwth deviation detector threshold for iss filter 120 khz ew if counter frequency error window ewexp expanded if counter error window fmon internal switch fm-am mode fswo weighted fieldstrength with offset adjust hcena high cut enable hcht start level high cut hclt stop level high cut hcmax maximum high cut depth icp charge pump current tuner pll if1g if1 amplifier gain if2a if2 lc band pass fine adjust if2q if2 lc band pass quality adjust ifagc fm/am if agc threshold ifagcs am ifagc threshold shift TDA7541B software specification doc id 16048 rev 1 45/77 ifs if counter sampling time ifsexp expanded if counter sampling time issbw iss filter band width select issena iss filter enable isson iss filter control mode issm iss filter application mode kagc fm keying agc ldena lock detector enable tuner pll lg stereo decoder level gain adjust lm fm local mode enable lna am lna pin/fet mode mpac influence tuner multi path detection on adjacent channel behavior mpcc stereo decoder multi path detector charge current mpena tuner multi path detector infl uence on adjacent channel enable mpfast fast mode of multi path information at quality pin mpg multi path detector gain mpint stereo decoder multi path internal influence enable mprg stereo decoder multi path detector rectifier gain mpth tuner multi path detector threshold ms mono/stereo switch fixed (?forced mono?) mux output multiplexer for mux pin nbena audio noise blanker enable nbct audio noise blanker noise controlled threshold nbdc audio noise blanker deviation control nbfc audio noise blanker field strength control nblt audio noise blanker low threshold nbmp stereo decoder multi path infl uence on peak discharge current nbpc audio noise blanker peak charge current nbrr audio noise blanker rectifier discharge resistor nbsmp strong multi path influence on audio noise blanker nbt audio noise blanker time constant odcur current for over deviation correction odena over deviation correction enable pc tuner pll counter table 15. i 2 c control bit description (continued) register name function software specification TDA7541B 46/77 doc id 16048 rev 1 pcm pilot cancellation mode ph iq mixer phase adjust pth pilot detector threshold qdc stereo decoder quality detector coefficient qng stereo decoder quality noise gain rc tuner pll reference counter rfagc fm/am rf agc threshold rfk fm rf keying agc roc stereo decoder roll off compensation sacct strong adjacent channel correction threshold sacce strong adjacent channel correction enable sbc stereo blend control sdm stereo decoder mute enable seek fm: fmon = 1, iss time co nstant change / am: fmon = 0, agc2 time constant change sl s meter slope ssth field strength threshold for seek stop sw free programmable switch swm free programmable switch mode tdev time constant for deviation detector tiss time constant for iss filter ?on?/?off? tvm tuning voltage offset mode tvo tuning voltage offset tvo+ additional fixed tuning voltage offset vcod tuner vco divider vcon std vco ?on/off? wbon weather band mode (iss filter band width 24 khz) wmd weak signal mute depth wmth weak signal mute start point threshold xtal xtal frequency fine adjust table 15. i 2 c control bit description (continued) register name function TDA7541B software specification doc id 16048 rev 1 47/77 5.4 data byte specification table 16. subaddress description msb lsb function - - i a4a3a2a1 a0 --- 0000 0charge pump control 1011 1audio noise blanker ii -- 0 ---- - page mode ?off? 1 page mode enable table 17. addr 0 tpll charge pump control (0bh) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 - ---- icp<2:0> 0 0 0 charge pump current = 50 a 0 0 1 charge pump current = 0.5 ma 0 1 0 charge pump current = 1 ma 0 1 1 charge pump current = 1.5 ma 1 1 0 charge pump current = 3 ma 1 1 1 charge pump current = 3.5 ma - --- -- - ldena 0 lock detector disable 1 lock detector enable - -- --- - sdm 0 stereo decoder mute disable 1 stereo decoder mute enable - - ---- - lm 0 local mode disable 1 local mode enable - ----- - asfc 0 weak signal mute and agc normal mode in fm 1 weak signal mute and agc on hold in fm mode ------ - seek 0 iss time constant at pin 30 available, am seek ?off? 1 iss time constant at pin 31 available, am seek ?on? software specification TDA7541B 48/77 doc id 16048 rev 1 note: swallow mode: fvco/fsyn = lsb + msb + 32 table 18. addr 1 tpll counter 1 (lsb) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 pc<7:0> 0 000000 0lsb = 0 0 000000 1lsb = 1 0 000001 0lsb = 2 1 111110 0lsb = 252 1 111110 1lsb = 253 1 111111 0lsb = 254 1 111111 1lsb = 255 table 19. addr 2 tpll counter 2 (msb) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 pc<15:8> 0 000000 0msb = 0 0 000000 1msb = 256 0 000001 0msb = 512 1 111110 0msb = 64768 1 111110 1msb = 65024 1 111111 0msb = 65280 1 111111 1msb = 65536 table 20. addr 3 tv(00h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 tvo<7:0> 0 0 0 0 0 0 0 tuning voltage offset = 0mv 000000 1tvo = 25 mv 000001 0tvo = 50 mv 111111 0tvo = 3150 mv 111111 1tvo = 3175 mv 0 ------ - -tvo 1+tvo TDA7541B software specification doc id 16048 rev 1 49/77 table 21. addr 4 tv/if counter (fm ach, am 1ch) addr25 msb lsb function d7 d6 d7 d6 d5 d4 d3 d2 d1 d0 -- - ------ tvo+ 0 disable additional tv offset 1 enable additional tv offset + 3.175 v -- - ----- - tvm 0 tv is tracking with pll 1 tv is independing on pll -- - ---- - - issena 0 iss filter switched of f (bypass of filter, wide) 1 iss filter control enable ifs<4:3> 100t sample = 20.48 ms (fm) 128 ms (am) 101t sample = 10.24 ms (fm) 64 ms (am) 110t sample = 5.12 ms (fm) 32 ms (am) -1 - - -11- - -t sample = 2.56 ms (fm) 16 ms (am) 000t sample = 1.28 ms (fm) 8 ms (am) 001t sample = 0.64 ms (fm) 4 ms (am) 010t sample = 0.32 ms (fm) 2 ms (am) 011t sample = 0.16 ms (fm) 1 ms (am) - - ---- - ew<6:5> 100 f = 12.5 khz (fm) 2 khz (am) 101 f = 25 khz (fm) 4 khz (am) 110 f = 50 khz (fm) 8 khz (am) 111 f = 100khz (fm) 16khz (am) 000 not valid 001 not valid 010 not valid 011 f = 6.25 khz (fm) 1 khz (am) fmon -- 0 ------ -select am mode 1 select fm mode software specification TDA7541B 50/77 doc id 16048 rev 1 table 22. addr 5 tpll divider (fm 3dh, am 2dh) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 vcod<2:0> 0 0 not valid (only for testing) 0 1 vco frequency divided by 2 - - - - - 1 0 vco frequency divided by 3 1 1 original vco frequency 0 vco ?i? signal 0 degree 1 vco ?i? signal 180 degree -- --- rc<5:3> 0 1 1 pll reference frequency 2 khz 1 0 0 pll reference frequency 9 khz 1 0 1 pll reference frequency 10 khz (am) 1 1 0 pll reference frequency 25 khz 1 1 1 pll reference frequency 50 khz (fm) amd<7:6> 0 0 am vco predivider ratio 10 0 1----- -am vco predivider ratio 8 1 0 am vco predivider ratio 6 1 1 am vco predivider ratio 4 TDA7541B software specification doc id 16048 rev 1 51/77 table 23. addr 6 agc (fm 06h, am 2ah) addr12 msb lsb function d7 d7 d6 d5 d4 d3 d2 d1 d0 - - ----- rfagc<1:0> 0 0 rfagc threshold fm v 8-10 = 80 dbv, am v 3 = 92 dbv 0 1 rfagc threshold fm v 8-10 = 84 dbv, am v 3 = 99 dbv 1 0 rfagc threshold fm v 8-10 = 88 dbv, am v 3 = 102 dbv 1 1 rfagc threshold fm v 8-10 = 92 dbv, am v 3 = 104 dbv ifagc<3:2> 1 0 0 ifagc threshold fm v 61 = 82 dbv, am v 61 = 89 dbv 1 0 1 ifagc threshold fm v 61 = 88 dbv , am v 61 = 95 dbv 1 1 0 ifagc threshold fm v 61 = 91 dbv, am v 61 = 99 dbv 1 - - - - 1 1 - - ifagc threshold fm v 61 = 94 dbv, am v 61 = 102 dbv 0 0 0 ifagc threshold fm v 61 = 82 dbv, am v 61 = 79 dbv 0 0 1 ifagc threshold fm v 61 = 88 dbv, am v 61 = 85 dbv 0 1 0 ifagc threshold fm v 61 = 91 dbv, am v 61 = 89 dbv 0 1 1 ifagc threshold fm v 61 = 94 dbv, am v 61 = 92 dbv --- ---- dagc<5:4> 0 0 dagc v 56 = 86 db 0 1 dagc v 56 = 91 db 1 0 dagc v 56 = 95 db 1 1 dagc v 56 = 98 db - ----- - lna<7:6> 00 i 4 = 400 a, v 54 = 4.5 v, am lna pin/fet mode ?off? 01 i 4 = 400 a + 50 a, v 54 = 3.5 v 10 i 4 = 400 a + 100 a, v 54 = 3.5 v 11 i 4 = 400 a + 100 a, v 54 = 3.5 v software specification TDA7541B 52/77 doc id 16048 rev 1 table 24. addr 7 quality ac (fm 50h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 issbw - - - - - - - 0 iss filter fixed band width 120 khz 1 iss filter fixed band width 80 khz bwdef - - - - - - 0 - disable bit issbw for iss filter band width control 1 enable bit issbw for iss filter band width control acf - - - - - 0 - - ac highpass frequency 100 khz 1 ac bandpass frequency 100 khz acth<4:3> 0 0 ac detector threshold 0.35 v - - - 0 1 - - - ac detector threshold 0.45 v 1 0 ac detector threshold 0.55 v 1 1 ac detector threshold 0.65 v tiss<7:5> 0 0 0 discharge current 1 a, charge current mid 74 a, narrow 124 a 0 0 1 discharge current 3 a, charge current mid 72 a, narrow 122 a 0 1 0 - - - - - discharge current 5 a, charge current mid 70 a, narrow 120 a 0 1 1 discharge current 7 a, charge current mid 68 a, narrow 118 a 1 1 1 discharge current 15 a, charge current mid 60 a, narrow 110 a TDA7541B software specification doc id 16048 rev 1 53/77 table 25. addr 8 quality acm/mp (fm 6ah) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 ----- acmth<2:0> 0 0 0 ac mute threshold 60 mv 0 0 1 ac mute threshold 90 mv 0 1 0 ac mute threshold 150 mv 1 1 0 ac mute threshold 240 mv 1 1 1 ac mute off acmd - - - - 0 - - - adjacent channel mute depth -4 db 1 adjacent channel mute depth -6 db mpena - - - 0 - - - - multipath control ?on? 1 multipath control ?off? mpac - - 0 - - - - - multipath eliminates ac (mpena = 0) 1 multipath eliminates ac and ac+ (mpena = 0) mpth<7:6> 0 0 mp threshold 0.50 v 0 1 - - - - - - mp threshold 0.75 v 1 0 mp threshold 1.00 v 1 1 mp threshold 1.25 v software specification TDA7541B 54/77 doc id 16048 rev 1 table 26. addr 9 quality dev (fm 49h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 tdev<2:0> 0 0 0 charge current 39 a, discharge current 1 a 0 0 1 charge current 38 a, discharge current 2 a - - - - - 0 1 0 charge current 37 a, discharge current 3 a 0 1 1 charge current 36 a, discharge current 4 a 1 1 0 charge current 33 a, discharge current 7 a 1 1 1 charge current 32 a, discharge current 8 a dwth<4:3> 0 0 dev threshold for iss narrow/wide 20 khz - - - 0 1 - - - dev threshold for iss narrow/wide 30 khz 1 0 dev threshold for iss narrow/wide 40 khz 1 1 dev threshold for iss narrow/wide 50 khz dth<6:5> 0 0 dev threshold for iss filter ?off? ratio 1.5 - 0 1 - - - - - dev threshold for iss filter ?off? ratio 1.4 1 0 dev threshold for iss filter ?off? ratio 1.3 1 1 dev threshold for iss filter ?off? ratio 1 issm 0 - - - - - - - iss filter application mode 1 1 iss filter application mode 2 TDA7541B software specification doc id 16048 rev 1 55/77 table 27. addr 10 quality mux/fsu (fm 0eh, am 0fh) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 mux<1:0> 0 0 detected multipath information at pin 23 - - - - - - 0 1 detected adjacent chann el information at pin 23 1 0 quality information st ereo decoder at pin 23 1 1 fmon=1: stereo indication at pin 23 fmon=0: am if2 signal at pin 23 - ----0 1 -- sacce strong adjacent channel correction disable strong adjacent channel correction enable ----0 1 -- - sacct strong adjacent channel correction threshold = 2.9 v strong adjacent channel correction threshold = 3.0v ssth<7:4> 0 0 0 0 sstop = ifc (if counter status) 0 0 0 1 sstop = h if ifc = h & fs > (fm: 0.6 v / am: 1.2 v) 0 0 1 0 - - - - sstop = h if ifc = h & fs > 0 0 1 1 sstop = h if ifc = h & fs > 0 1 0 0 sstop = h if ifc = h & fs > 1 1 1 1 sstop = h if ifc = h & fs > (fm: 4.1 v / am: 4.8 v) table 28. addr 11 weak signal mute (fm a8h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 isson - ------0iss filter internal control 1 iss filter forced ?on? wbon - -----0-weather band disable 1 weather band enable wmth<4:2> 0 0 0 startpoint mute 0 0 0 1 startpoint mute 1 - - - 0 1 0 - - startpoint mute 2 1 1 0 startpoint mute 6 1 1 1 startpoint mute 7 wmd<7:5> 0 0 0 mute depth 0 0 0 1 - - - - - mute depth 1 1 0 1 mute depth 5 1 1 1 mute depth 7 software specification TDA7541B 56/77 doc id 16048 rev 1 table 29. addr 12 am if nb (am b1h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 ainena - - - - - - - 0 am if noise blanker disable 1 am if noise blanker enable ainth<4:1> 0 0 0 0 not recommended ---- - 0 0 1 0 not recommended 0 1 0 0 am if nb threshold 50 mv - - - 0 1 0 1 - am if nb threshold 62.5 mv ---- - 1 0 0 0 am if nb threshold 100 mv ---- - 1 1 1 1 am if nb threshold 187.5 mv aint<6:5> 0 0 am if nb time 8 s - 0 1 - - - - - am if nb time 11 s 1 0 am if nb time 14 s 1 1 am if nb time 17 s ifagcs 0 - - - - - - - enable am ifagc threshold shift down (check address6) 1 disable am ifagc threshold shift down table 30. addr 13 xtal adjust(80h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 xtal<4:0> 0000 0c load 0pf 0000 1c load 0.75 pf - - - 0001 0c load 1.5 pf 0001 1c load 2.25 pf 0010 0c load 3 pf 1111 0c load 22.5 pf 1111 1c load 23.25 pf sl<7:5> 0 0 0 s meter slope fm = 0.75 v/20 db, am = 1.61 v/20 db 0 0 1 s meter slope fm = 0.80 v/20 db, am = 1.75 v/20 db 0 1 0 s meter slope fm = 0.85 v/20 db, am = 1.89 v/20 db 0 1 1 - - - - - s meter slope fm = 0.90 v/20 db, am = 1.98 v/20 db 1 0 0 s meter slope fm = 0.95 v/20 db, am = 2.04 v/20 db 1 0 1 s meter slope fm = 1.0 v/20 db, am = 2.1 v/20 db 1 1 0 s meter slope fm = 1.05 v/20 db, am = 2.15 v/20 db 1 1 1 s meter slope fm = 1.1 v/20 db, am = 2.20 v/20 db TDA7541B software specification doc id 16048 rev 1 57/77 table 31. addr 14 if2 adjust (fm e8h, am 08h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 if2a<3:0> 000 0c adj 0 pf 000 1c adj 2,2 pf ----0010c adj 4,4 pf 001 1c adj 6,6 pf 010 0c adj 8,8 pf 100 0c adj 17,6 pf 111 1c adj 33 pf if2q<5:4> 0 0 no r int , am q=28/gain=26 db , fm q=28/gain=16 db --01----r int =5 kohm, fm q=3/gain=14 db, bw=150 khz 10 r int =4,1 kohm, fm q=2,5/gain=14 db, bw=180 khz 11 r int =3,3 kohm, fm q=2,05/gain=14 db, bw=220 khz if1g<7:6> 0 0 if1 gain 9 db (am) 0 1 - - - - - - if1 gain 12 db 1 0 if1 gain 17 db 1 1 if1 gain 21 db (fm) software specification TDA7541B 58/77 doc id 16048 rev 1 table 32. addr 15 iq adjust / switch (fm e7h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 ph<3:0> 000 0-7 degree 000 1-6 degree 001 0-5 degree - - - - 0 1 1 1 0 degree 1 0 0 0 1 degree 1 0 0 1 2 degree 1 1 1 0 7 degree 1 1 1 1 8 degree sw - - - 0 - - - - s1 low output voltage 1 s1 high output voltage swm - - 0 - - - - - s1 emitter output available 1 s1 open collector output available dsb<7:6> 0 0 fm demodulator spike cancellation ?off? 0 1 - - - - - - threshold for fm demodulator spike cancellation 630 mv 1 0 threshold for fm demodulator spike cancellation 400 mv 1 1 threshold for fm demodulator spike cancellation 520 mv TDA7541B software specification doc id 16048 rev 1 59/77 table 33. addr 16 fm keying agc (fm 1dh) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 odena - - - - - - - 0 over deviation correction disable 1 over deviation correction enable odcur - - - - - - 0 - over deviation co rrection current max=45 a 1 over deviation correct ion current max=90 a kagc<4:2> 0 0 0 kagc threshold 3,60* v 48 /5 0 0 1 kagc threshold 3,65* v 48 /5 0 1 0 kagc threshold 3,70* v 48 /5 - - - 0 1 1 - - kagc threshold 3,75* v 48 /5 1 0 0 kagc threshold 3,80* v 48 /5 1 0 1 kagc threshold 3,85* v 48 /5 1 1 0 kagc threshold 3,90* v 48 /5 1 1 1 keying agc ?off? rfk - - 0 - - - - - rf keying agc off 1 rf keying agc on fswo<7:6> 0 0 fsw offset off 0 1 - - - - - - fsw offset = -75 mv 1 0 fsw offset = -150 mv 1 1 fsw offset = -192 mv software specification TDA7541B 60/77 doc id 16048 rev 1 table 34. addr 17 roll off / level gain (77h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 roc<3:0> 0 0 0 0 roll-off compensation 25.8 % 0 0 0 1 roll-off compensation 24.0 % 0 0 1 0 roll-off compensation 22.2 % 0 0 1 1 roll-off compensation 20.5 % 0 1 0 0 roll-off compensation 18.8 % 0 1 0 1 roll-off compensation 17.1 % 0 1 1 0 roll-off compensation 15.4 % - - - - 0 1 1 1 roll-off compensation 13.8 % 1 0 0 0 roll-off compensation 12.2 % 1 0 0 1 roll-off compensation 10.6 % 1 0 1 0 roll-off compensation 9.0 % 1 0 1 1 roll-off compensation 7.5 % 1 1 0 0 roll-off compensation 6.0 % 1 1 0 1 roll-off compensation 4.5 % 1 1 1 0 roll-off compensation 3,0 % 1 1 1 1 roll-off compensation 1.6 % lg<7:4> 0 0 0 0 level gain 0 db 0 0 0 1 level gain 0.55 db 0 0 1 0 - - - - level gain 1.10 db 0 1 1 1 level gain 3.85 db 1 1 1 1 level gain 8.25 db TDA7541B software specification doc id 16048 rev 1 61/77 table 35. addr 18 sd stereoblend / am corner frequency (0dh) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 sbc<2:0> 0 0 0 stereoblend control at 29 % ref5v 0 0 1 stereoblend control at 33 % ref5v 0 1 0 stereoblend control at 38 % ref5v - - - - - 0 1 1 stereoblend control at 42 % ref5v 1 0 0 stereoblend control at 46 % ref5v 1 0 1 stereoblend control at 50 % ref5v 1 1 0 stereoblend control at 54 % ref5v 1 1 1 stereoblend control at 58 % ref5v pth - - - - 0 - - - pilot threshold high 1 pilot threshold low asi - - - 0 - - - - audio inverter ?off? 1 audio inverter ?on? amcf<7:5> 0 0 0 am attenuation @ 3.5 khz = 8.4 db 0 0 1 am attenuation @ 3.5 khz = 8.0 db 0 1 0 - - - - - am attenuation @ 3.5 khz = 7.3 db 1 1 0 am attenuation @ 3.5 khz = 4.4 db 1 1 1 am attenuation @ 3.5 khz = 3.6 db software specification TDA7541B 62/77 doc id 16048 rev 1 table 36. addr 19 sd high cut (2fh) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 hcena - ------0high cut ?off? 1 high cut ?on? hcmax<2:1> 0 0 maximum high cut 10 db - - - - - 0 1 - maximum high cut 5.5 db 1 0 maximum high cut 7.5 db 1 1 maximum high cut 8.5 db hcht<4:3> 0 0 start level high cut @ 42 % ref5v - - - 0 1 - - - start level high cut @ 50 % ref5v 1 0 start level high cut @ 58 % ref5v 1 1 start level high cut @ 66 % ref5v hclt<6:5> 0 0 stop level high cut @ 11 % v hcht - 0 1 - - - - - stop level high cut @ 18.3 % v hcht 1 0 stop level high cut @ 25.7 % v hcht 1 1 stop level high cut @ 33 % v hcht deemp 0 - - - - - - - de-emphasis 50 s 1 de-emphasis 75 s TDA7541B software specification doc id 16048 rev 1 63/77 table 37. addr 20 sd mp (fm 97h, am 3fh) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 mpg<1:0> 0 0 multipath detector gain =6 db - -----01multipath detector gain =12 db 1 0 multipath detector gain =9 db 1 1 multipath detector gain =10.5 db mprg<3:2> 0 0 multipath detector rectifier gain =7,6 db - - - - 0 1 - - multipath detector rectifier gain =4,6 db 1 0 multipath detector rectifier gain =0d b 1 1 multipath detector rectifier gain disabled mpcc - - - 0 - - - - multipath detector charge current =0,8 a 1 multipath detector charge current =0,4 a mpint - -0---- -multipath detector internal influence ?on? 1 multipath detector internal influence ?off? mpfast 0----- -external time constant (mptc) enable 1 external time constant (mptc) disable ms 0 ------ -forced mono 1 mono/stereo switch automatically software specification TDA7541B 64/77 doc id 16048 rev 1 table 38. addr 21 sd quality (ffm 7ah, am fah) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 qdc<1:0> 0 0 quality detector coefficient a=0,6 - -----01quality detector coefficient a=0,75 1 0 quality detector coefficient a=0,9 1 1 quality detector coefficient a=1,05 qng<3:2> 0 0 quality noise gain =6 db - - - - 0 1 - - quality noise gain =9 db 1 0 quality noise gain =12 db 1 1 quality noise gain =15 db nbdc<5:4> 0 0 noise blanker deviation adjust 2.0 v - - 0 1 - - - - noise blanker deviation adjust 1.5 v 1 0 noise blanker deviation adjust 1.0 v 1 1 noise blanker deviation adjust ?off? nbfc<7:6> 0 0 noise blanker field strength adjust 2.0 v 0 1 - - - - - - noise blanker field strength adjust 1.6 v 1 0 noise blanker field strength adjust 1.4 v 1 1 noise blanker field strength adjust ?off? TDA7541B software specification doc id 16048 rev 1 65/77 table 39. addr 22 sd nb i (fm 05h, am 04h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 nbena - ------ 0audio noise blanker ?off? 1 audio noise blanker ?on? nbt<2:1> 0 0 audio noise blanking time 38 s - - - - - 0 1 - audio noise blanking time 25,5 s 1 0 audio noise blanking time 32 s 1 1 audio noise blanking time 22 s nblt<5:3> 0 0 0 noise blanker low threshold 280 mv 0 0 1 noise blanker low threshold 261 mv 0 1 0 noise blanker low threshold 242 mv - - 0 1 1 - - - noise blanker low threshold 223 mv 1 0 0 noise blanker low threshold 204 mv 1 0 1 noise blanker low threshold 185 mv 1 1 0 noise blanker low threshold 166 mv 1 1 1 noise blanker low threshold 147 mv nbct<7:6> 0 0 noise blanker noise controlled threshold 1200 mv 0 1 - - - - - - noise blanker noise controlled threshold 950 mv 1 0 noise blanker noise controlled threshold 700 mv 1 1 noise blanker noise controlled threshold 450 mv software specification TDA7541B 66/77 doc id 16048 rev 1 table 40. addr 23 sd nb ii (fm e2h, am c2h) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 nbpc - - - - - - - 0 noise blanker peak charge current low 1 noise blanker peak charge current high nbrr<2:1> 0 0 noise rectifier dischar ge resistor = infinite - - - - - 0 1 - noise rectifier di scharge resistor =56 k 1 0 noise rectifier disc harge resistor =33 k 1 1 noise rectifier disc harge resistor =18k nbmp - - - - 0 - - - multipath influence on peak discharge ?off? 1 multipath influence on peak discharge ?on? (-3 v/ms) nbsmp - - - 0 - - - - strong multipath influence on peak discharge ?off? 1 strong multipath influence on peak discharge ?on? vcon - - 0 - - - - - stereo decoder vco ?off? 1 stereo decoder vco ?on? pcm - 0 - - - - - - pilot cancellation mode: always 1 pilot cancellation mode: if pilot > pilot threshold adsel 0 - - - - - - - additional selectivity off 1 additional selectivity on TDA7541B software specification doc id 16048 rev 1 67/77 table 41. addr 24, 26, 27, 28, 29 testing (feh) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 1 111111 0 only for testing table 42. addr 25 testing (feh) msb lsb function d7 d6 d5 d4 d3 d2 d1 d0 - - 11111 0 only for testing ifsexp - 0 - - - - - - enable expand mode of if sampling time (see addr 4) 1 disable expand mode of if sampling time ewexp 0 - - - - - - - enable expand mode of error window (see addr 4) 1 disable expand mode of error window appendix TDA7541B 68/77 doc id 16048 rev 1 6 appendix figure 8. block diagram fm part TDA7541B appendix doc id 16048 rev 1 69/77 figure 9. block diagram vco appendix TDA7541B 70/77 doc id 16048 rev 1 figure 10. block diagram iss function TDA7541B appendix doc id 16048 rev 1 71/77 figure 11. block diagram am path appendix TDA7541B 72/77 doc id 16048 rev 1 figure 12. block diagram stereo decoder figure 13. block diagram audio noise blanker mptc mpxout mpxin fstc mux l r mpxin fmdemout l/r fstc deviation detector integrator discharge control fieldstrenght adjust rectifier threshold generator rect mptc peak vth stereo decoder nbdc nbfc nbpc nbct nblt nbrr nbmp nbsmp fmon fmon monoflop fm:22-40s am:0.3-1.2ms s&h nbena nbt 140khz hpf (2nd. order) TDA7541B appendix doc id 16048 rev 1 73/77 figure 14. block diagram multi path detection for stereo decoder fstc mux bandpass 19khz rectifier rectifier stereo blend attack/decay internal mpg mprg mpcc mpfast/ seek mptc mpint fs application circuit TDA7541B 74/77 doc id 16048 rev 1 7 application circuit figure 15. application circuit 1 10 100n 22n 8.5v 1 x1 1 330n 100n 330n 10 100n 8.5v 22 100n 8.5v 100n 8.5v 2.2 8.5v 8.5v cf1 4.7 100n 100n 1 100n 22 4.7 100n cf3 q_loaded 28 180p 100n 1 470n 470n 100n 470n 470n 220n 100p 3.3n 2.2 fm_am sstop sda scl fsu mux l r am _af/mpx l=560nh cf2 680 nh 330p 10.7mhz 0.7mhz 450khz wb 5 am mi x1ref 6 am pindr 7 am rfagcout 4 am mi x1in 3 devtc 2 vccmix 1 1 fmpindr 12 fmmix1in1 8 gndrf 9 sw 22 lphc 21 lpf 20 vref2 19 lpout 18 gndvco 17 fsu 27 scl 26 sda 25 sstop 24 mux 23 gndstd 38 if1ref 58 mptc 39 mutetc 42 mpxout 43 mpxi n 41 am if2ref 44 fmrefdemc 45 gnddem 46 ami f2in 47 vref1 48 amrfagctc 54 mix2in 56 mi x2inref 55 if1ampout 59 amrefdemc 40 vccif1 60 if1ampin 61 gndif 62 ama gc2tc 57 mix1ref 63 mix1out 64 fmmix1in2 10 tv 11 fmagctc 13 vcob 14 vcoe 15 vccvco 16 xtald 32 isstc2 31 isstc1 30 xtalg 29 fstc 28 gndvcc 1 33 r 35 l 34 fswo 37 vcc1 36 gndvcc2 49 vcc2 51 50 mix2ref 52 mix2out 53 mix2ampout TDA7541B ac00706 TDA7541B package information doc id 16048 rev 1 75/77 8 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 16. lqfp64 mechanical data and package dimensions outline and mechanical data a a2 a1 b c 16 17 32 33 48 49 64 e3 d3 e1 e d1 d e 1 k b tqfp64 l l1 seating plane 0.08mm dim. mm inch min. typ. max. min. typ. max. a 1.60 0.063 a1 0.05 0.15 0.002 0.006 a2 1.35 1.40 1.45 0.053 0.055 0.057 b 0.17 0.22 0.27 0.20 0.0066 0.0086 0.0106 0.0079 c 0.09 0.0035 d 11.80 12.00 12.20 0.464 0.472 0.480 d1 9.80 10.00 10.20 0.386 0.394 0.401 d3 7.50 0.295 e 0.50 0.0197 e 11.80 12.00 12.20 0.464 0.472 0.480 e1 9.80 10.00 10.20 0.386 0.394 0.401 e3 7.50 0.295 l 0.45 0.60 0.75 0.0177 0.0236 0.0295 l1 1.00 0.0393 k 0? (min.), 3.5? (min.), 7?(max.) ccc 0.080 0.0031 lqfp64 (10 x 10 x 1.4mm) 0051434 f ccc revision history TDA7541B 76/77 doc id 16048 rev 1 9 revision history table 43. document revision history date revision changes 22-jul-2009 1 initial release. TDA7541B doc id 16048 rev 1 77/77 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2009 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com |
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