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u4255bm rev. a2, 11-oct-00 1 (14) am/fm receiver ic description the u4255bm is an integrated am/fm front end circuit in bicmos technology. it contains a double conversion system for fm and an up/down conversion circuit for am (if1 = 10.7 mhz, if2 = 450 khz). a complete automatically aligned high performance am/fm tuner can be built together with the pll u4256bm. this ics are designed for high performance car radio applications. electrostatic sensitive device. observe precautions for handling. features fm-double conversion system integrated second if filter with software controlled bandwidth completely integrated fm demodulator soft mute and multipath noise cancellation receiving condition analyzer am up/down conversion system am preamplifier with agc and stereo capability 3-wire bus controlled stop signal generation for am and fm automatic alignment possible block diagram 30 29 mx2in mx2ob am 4 3 2 7 6 41 26 23 amagc amvreg mx1ama mx1amb gndmx mx1fmb amplpf mx1oa if1fmi 8 43 38 mx2oa if2in v3p if2out 24 28 27 20 if1ref if1ami if1out v3 39 33 agc 15 16 14 1 mx1fma oscout gndosc osce 13 oscb mx1ob 44 fm divider am fm osc agc v3 bus fmagc en clk data 17 18 19 5 bandgap meter v57 gnd vs 12 25 42 9 v3 adjac mx2lo 22 10 dev int multip smute 21 40 34 31 int adj. chan. stop multi path agc am dem. 32 36 35 37 11 oplpf ifagcl ifagcch fmadj mpx automatic adjustment soft mute dev. ana. fm dem. figure 1. block diagram ordering information extended type number package remarks u4255bm-afn sso44 tube U4255BM-AFNG3 sso44 taped and reeled
u4255bm rev. a2, 11-oct-00 2 (14) pin description pin symbol function 1 mx1fma 1st mixer fm input a 2 mx1fmb 1st mixer fm input b 3 mx1amb 1st mixer am input b 4 gndmx ground 1st mixer 5 fmagc fm preamplifier agc 6 amvreg am control voltage 7 amagc am preamplifier agc 8 amplpf am agc lp filter 9 meter fieldstrength output 10 adjac adjacent channel detection output 11 mpx multiplex signal 12 v57 5.7 v reference voltage 13 oscb oscillator basis 14 osce oscillator emitter 15 gndosc oscillator ground 16 oscout oscillator output 17 en 3-wire bus enable 18 clk 3-wire bus clock 19 data 3-wire bus data 20 if2out 2nd if amplifier output 21 int interrupt, stop signal, test out 22 mx2lo 10.25 mhz input for 2nd mixer 23 mx2ob 2nd mixer output b 24 mx2oa 2nd mixer output a 25 gnd ground 26 mx2in 2nd mixer input 27 v3p 3 v reference for ampin, amifagc, control, if2in 28 if2in 2nd if amplifier input 29 v3 3 v reference for if1out, mx2in 30 if1out 1st if amplifier output 31 dev deviation detect output 32 oplpf operating point lpf 33 if1ami 1st if am amplifier input 34 smute soft mute control input 35 ifagch if agc lp filter high time 36 ifagcl if agc lp filter low time constant 37 filadj filter adjust 38 if1fmi 1st if fm amplifier input 39 if1ref 1st if & mx1out reference, mx1am a, mx1am b 40 multip multipath detection output 41 mx1ama 1st mixer am input a 42 vs supply voltage 43 mx1oa 1st mixer output a 44 mx1ob 1st mixer output b 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 dev if1out v3 if2in v3p mx2in if1ami oplpf gnd smute ifagch ifagcl 14856 mx2oa mx2ob if1ref if1fmi filadj mx1ama multip vs mx1oa mx1ob mx1fma mx1fmb mx1amb gndmx fmagc amvreg amagc amplpf meter adjac mpx v57 oscb osce gndosc oscout en clk data if2out int mx2lo figure 2. pinning
u4255bm rev. a2, 11-oct-00 3 (14) absolute maximum ratings all voltages are referred to gnd (pin 25) parameter symbol value unit supply voltage pin 42 v s 10 v power dissipation p tot 800 mw junction temperature t j 150 c ambient temperature range t amb 40 to +85 c storage temperature range t stg 50 to +150 c thermal resistance parameter symbol value unit junction ambient soldered to pcb r thja 80 k/w operating range all voltages are referred to gnd (pin 25) parameter symbol min. typ. max. unit supply voltage range pin 42 v s 7.5 8.5 10 v ambient temperature t amb 40 +85 c electrical characteristics test conditions (unless otherwise specified): v s = 8.5 v, t amb = 25 c. for ac parameters: fi rf = 100 mhz, rg = 50 , f mod = 0.4 khz, d f = 75 khz, f if = 450 khz, reference point pin 4 parameter test conditions / pins symbol min. typ. max. unit supply voltage pin 42 v s 8.5 10 v supply current pin 42 i s 70 ma am mixer (10.7 mhz) dc supply current 18 ma conversion conductance io if /vi rf s m1 4.1 ma/v maximum if output pins 43 and 44 vo if 8 v pp third order input intercept point ip3 133 db m v input resistance pin 41 2.5 k
u4255bm rev. a2, 11-oct-00 4 (14) electrical characteristics (continued) test conditions (unless otherwise specified): v s = 8.5 v, t amb = 25 c. for ac parameters: fi rf = 100 mhz, rg = 50 , f mod = 0.4 khz, d f = 75 khz, f if = 450 khz, reference point pin 4 unit max. typ. min. symbol test conditions / pins parameter am-1st if amplifier (10.7 mhz) input resistance pin 33 r i 10 k 1st if amplifier gain rl = 330 pins 30 to 33 g 16 db preamplifier control range 26 db mixer 2 (450 khz) dc supply current 10 ma conversion conductance io- if2 /vi if1 s m2 2 ma/v maximum if output pins 23 and 24 vo if 8 v pp output impedance r o c o 1 3 m pf third order input intercept point ip3 133 db m v input resistance r i 330 2nd if amplifier (450 khz) input resistance pin 28 r i 3 k if preamplifier gain pins 28 to 20 g 43 db preamplifier control range 37 db oscillator (pin 15, gnd, connected to external oscillator components) oscillator range rg (pin 13) = 220 , q of losc = 70, rl1 = 520 vlob vloe vlobuf 70 160 100 90 220 mv mv mv frequency range f osc 70 160 mhz harmonics pin16 15 dbc output resistance pin 16 r lo 70 fm mixer third order intercept point load impedance: r l43, 44 = 200 ip3 120 db v conversion transconductance g c 7 ma/v noise figure nf dsb 10 db input resistance pins 1 to 2 r i 1, 2 1.6 k input capacitance pins 1 to 2 c i 1, 2 5 pf input 1 resistance to ground f = 100 mhz pin 1 r i1 1.2 k input 1 capacitance to ground f = 100 mhz pin 1 c i1 9 pf
u4255bm rev. a2, 11-oct-00 5 (14) electrical characteristics (continued) test conditions (unless otherwise specified): v s = 8.5 v, t amb = 25 c. for ac parameters: fi rf = 100 mhz, rg = 50 , f mod = 0.4 khz, d f = 75 khz, f if = 450 khz, reference point pin 4 unit max. typ. min. symbol test conditions / pins parameter input 2 resistance to ground f = 100 mhz pin 2 r i2 1.6 k input 2 capacitance to ground f = 100 mhz pin 2 c i2 7 pf output capacitance to gnd pins 43, 44 c o 43, o44 5 pf 1st if fm amplifier digitally adjustable gain 3 bit, 10.7 mhz g min g max 19 30 db db input resistance pin 38 r i38 330 output resistance pin 30 r o30 330 temperature coefficient of the gain at g min g min , bit 66 = 0 tk min 0.044 db/k temperature coefficient of the gain at g max g max , bit 66 = 1 tk max 0.039 db/k fm demodulator (pin 11) output voltage v ipin 23, 24 = 40 mv f = 450 khz deviation = 22.5khz, f mod = 1 khz v mpx 140 mv total distortion bandwidth 2nd if filter = 120 khz, deviation = 75 khz 0.3 % 3-wire bus description 12 8-bit command en clk data lsb msb byte 1 24-bit command clk data lsb lsb msb msb byte 3 byte 2 msb lsb byte 1 en e.g., r-divider 0 0 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 2 2 13 ipd3 oscb p2 1 rdivider addr. p2 0 p2 2 14857 status 0 ipd1 2 14 2 15 ipd4 ipd2 figure 3. pulse diagram
u4255bm rev. a2, 11-oct-00 6 (14) data transfer a24_100 msb byte 3 lsb msb byte 2 lsb msb byte 1 lsb addr. am/fm/wb gain-fm if-amplifier search width of window osc-divider/multipath sensitivity field strength bwmpx. time window stop signal 1 0 0 am fm b93 b92 b91 b90 b89 b88 b87 b86 b85 b84 b83 b82 b81 b80 b79 b78 b77 b76 b75 b74 b73 a24_101 msb byte 3 lsb msb byte 2 lsb msb byte 1 lsb addr. wb- demod-gain start smute smute tk-fmzf fm agc am-agc fm bw if2 if2 center frequency mp fs fm ext not used 1 0 1 x x b72 b71 b70 b69 b68 b67 b66 b65 b64 b63 b62 b61 b60 b59 b58 b57 b56 b55 b54 b53 b52 a8_100 msb byte 1 lsb addr. test mpoff mute nk-sensor 1 0 0 0 b9 b8 b7 b6 b5 a8_101 msb byte 1 lsb addr. optimize band width 1 0 1 0 b4 b3 b2 b1 b0 bus timing t r t f t r t s t f t hen t r t s t hda t f t h t l 96 11826 enable data clock figure 4. bus timing
u4255bm rev. a2, 11-oct-00 7 (14) bus control the operating mode is set by the bits 92 and 93. am/fm/weather channel bit 93 bit 92 standby 0 0 fm 0 1 am 1 0 weather band 1 1 the bits 89 to 91 control gain of the fm if amplifier. gain fm-if bit 91 bit 90 bit 89 19 db 0 0 0 21 db 0 0 1 23 db 0 1 0 25 db 0 1 1 27 db 1 0 0 28 db 1 0 1 29 db 1 1 0 30 db 1 1 1 bit 88 switches the search mode on/off. station search bit 88 receive 0 search 1 bits 85 to 87 select the search-stop deviation from the center frequency. search-stop window bit 87 bit 86 bit 85 0.5 khz 0 0 0 1.1 khz 0 0 1 2.3 khz 0 1 0 4.8 khz 0 1 1 10 khz 1 0 0 20 khz 1 0 1 40 khz 1 1 0 80 khz 1 1 1 in am mode (bits 92 and 93), bits 81 to 83 set the divide factor of the am prescaler divider am mixer 1 bit 93 bit 92 bit 84 bit 83 bit 82 bit 81 divide by 10 1 0 x 0 0 0 divide by 6 1 0 x 0 0 1 divide by 7 1 0 x 0 1 0 divide by 8 1 0 x 1 0 0 divide by 4 1 0 x 1 0 1 in fm mode and in weather band mode (bit 92), the bits 81 to 84 set the sensitivity of the mnc sensitivity multipath bit 93 bit 92 bit 84 bit 83 bit 82 bit 81 off x 1 0 0 0 0 low x 1 0 0 0 1 x 1 0 0 1 0 x 1 0 0 1 1 x 1 0 1 0 0 x 1 0 1 0 1 x 1 0 1 1 0 normal x 1 0 1 1 1 x 1 1 0 0 0 x 1 1 0 0 1 x 1 1 0 1 0 x 1 1 0 1 1 x 1 1 1 0 0 x 1 1 1 0 1 x 1 1 1 1 0 high x 1 1 1 1 1 bit 80 switches between narrow band field strength informa- tion and wide band field strength information. field strength narrow band / wide band bit 80 field strength at pin 16 (wide band) 0 field strength from agc (narrow band) 1
u4255bm rev. a2, 11-oct-00 8 (14) bit 79 controls the bandwidth of the lowpass filter of the mpx output. bandwidth mpx lowpass filter bit 79 90 khz 0 180 khz 1 the stop counter calculates an average center frequency during the time wich is set by the bits 73 to 78. time window for stop signal bit 78 bit 77 bit 76 bit 75 bit 74 bit 73 1 3.1969 ms 0 0 0 0 0 1 ..... 63 3.1969 ms 1 1 1 1 1 1 the demodulator gain for the weather band mode is set by the bits 71 and 72. demodulator gain in weather band mode bit 72 bit 71 5 0 0 10 0 1 20 1 0 50 1 1 for soft mute, the mpx signal level will be reduced depending on the input signal strength. bits 68 to 70 set the input signal field strength, at which the mpx signal will be reduced by 3 db (for soft mute). the absolute value depends on the if-gain bit 89 91. start soft mute bit 70 bit 69 bit 68 at low fieldstrength 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 at high fieldstrength 1 1 1 bit 67 sets the maximum reduction of the mpx signal level. max value of soft mute bit 67 30 db 0 26 db 1 temperature coefficient setting of fm if amplifier. temperature coefficient (tc) of the if amplifier bit 66 tk 1 0 tk 2 1 level control of the fm agc threshold. fm agc threshold bit 65 bit 64 103 db v 0 0 97 db v 0 1 92 db v 1 0 85 db v 1 1 level control of the am agc threshold. am agc threshold bit 63 bit 62 102 db v 0 0 105 db v 0 1 107 db v 1 0 108 db v 1 1 bits 60 and 61 control the bandwidth of the 2nd mixer output tank, in fm mode. fm bandwidth mixer 2 bit 61 bit 60 150 khz 0 0 200 khz 0 1 250 khz 1 0 450 khz 1 1
u4255bm rev. a2, 11-oct-00 9 (14) setting of the center frequency of the integrated fm band filter and demodulator. if center bit 59 bit 58 bit 57 bit 56 450.00 khz 0 0 0 0 456.25 khz 0 0 0 1 461.50 khz 0 0 1 0 468.75 khz 0 0 1 1 475.00 khz 0 1 0 0 481.25 khz 0 1 0 1 487.50 khz 0 1 1 0 493.75 khz 0 1 1 1 450.00 khz 1 0 0 0 443.75 khz 1 0 0 1 437.50 khz 1 0 1 0 431.25 khz 1 0 1 1 425.00 khz 1 1 0 0 418.75 khz 1 1 0 1 412.50 khz 1 1 1 0 406.25 khz 1 1 1 1 function of pin 20 setting is done by bit 55. pin 21: if out/ field strength for multipath bit 55 2nd if output 0 multipath field strength 1 setting bit 54 = 1 enables the use of an additional external band filter (pin 23/24 to pin 28), in fm mode. 2nd if filter bit 54 internal filter 0 external and internal filter 1 setting bit 53 activates the automatic demodulator fine tuning which is used in weatherband mode. in fm the default setting is b53 = 1. demodulator fine adjust bit 53 fine tuning on 0 fine tuning off 1 the bit 52 is not used. setting of the center frequency-offset of the integrated fm band filter. if bit 4 = 0 the default setting (0 khz) is used. if correction bit 17 bit 16 bit 15 bit 14 0 khz 0 0 0 0 6.25 khz 0 0 0 1 12.50 khz 0 0 1 0 8.75 khz 0 0 1 1 25.00 khz 0 1 0 0 31.25 khz 0 1 0 1 37.50 khz 0 1 1 0 43.75 khz 0 1 1 1 + 0 khz (default) 1 0 0 0 + 6.25 khz 1 0 0 1 + 12.50 khz 1 0 1 0 + 8.75 khz 1 0 1 1 + 25.00 khz 1 1 0 0 + 31.25 khz 1 1 0 1 + 37.50 khz 1 1 1 0 + 43.75 khz 1 1 1 1 setting of the bandwidth of the adjacent channel detector filter. if bit 4 = 0 the default setting (76 khz) is used. if c orrection bit 13 bit 12 bit 11 bit 10 3 khz 0 0 0 0 46 khz 0 0 0 1 17.5 khz 0 0 1 0 60 khz 0 0 1 1 31 khz 0 1 0 0 76 khz (default) 0 1 0 1 54 khz 0 1 1 0 90 khz 0 1 1 1 61 khz 1 0 0 0 106 khz 1 0 0 1 76 khz 1 0 1 0 120 khz 1 0 1 1 90 khz 1 1 0 0 136 khz 1 1 0 1 105 khz 1 1 1 0 151 khz 1 1 1 1
u4255bm rev. a2, 11-oct-00 10 (14) setting bit 9 activates test mode. mode bit 9 normal operation 0 testmode 1 bit 8 = 0 activates the multipath noise canceller. multipath noise canceller bit 8 active 0 not active 1 bit 7 = 1 mutes the mpx output. mute of mpx output bit 7 mpx out, pin 11 0 mute mpx 1 bits 6 and 5 set the center frequency of the adjacent channel sensor. center frequency adjacent channel sensor bit 6 bit 5 450 khz 0 0 300 khz 0 1 700 khz 1 0 filter off 1 1 bit 4 = 1 activates bit 10 to bit 17. if bit 4 = 0 then the default seting is used. activate bit 10 to bit 17 bit 4 disable bits 10 to 17 0 enable bits 10 to 17 1 bits 0 to 3 set the band width of the integrated band filter. if band width bit 3 bit 2 bit 1 bit 0 200 khz 0 0 0 0 190 khz 0 0 0 1 180 khz 0 0 1 0 170 khz 0 0 1 1 160 khz 0 1 0 0 150 khz 0 1 0 1 140 khz 0 1 1 0 130 khz 0 1 1 1 120 khz 1 0 0 0 110 khz 1 0 0 1 100 khz 1 0 1 0 90 khz 1 0 1 1 80 khz 1 1 0 0 70 khz 1 1 0 1 60 khz 1 1 1 0 50 khz 1 1 1 1
u4255bm rev. a2, 11-oct-00 11 (14) test circuit 14906 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 test point v 50 50 470 vs v bus v vs 50 50 50 v3 pin 29 50 vs pin 29 50 vs figure 5. t est circuit
u4255bm rev. a2, 11-oct-00 12 (14) application board schematic 44 43 42 41 40 12345 39 38 37 36 6789 35 34 33 32 31 10 11 12 13 14 20 19 18 17 16 12345 15 14 13 12 6789 11 10 u4256bm u4255bm 30 29 28 15 16 17 27 26 25 24 23 18 19 20 21 22 r 111 200k c 205 10 f c 204 470nf c 206 10nf r 202 10k c 202 10nf c 203 1nf c 307 10nf 6 2 3 4 1 7 c 201 100nf am/zf1 f201 c 209 10nf c 207 220nf 6 7 1 4 3 2 c 309 220nf f302 am/zf2 kf302 450khz r 303 2.2k c 310 1.5nf r 201 270 kr201 10.7mhz kr202 10.7 mhz c 208 220nf c 312 10nf c 313 100nf 100nf c 308 10 f c 112 c 306 15pf r 104 470 r 105 10 c 303 10 f c 304 22n f c 114 220nf c 131 47pf c 132 22pf 3 1 7 fm0 c 133 6.8pf f131 d 131 bb804 10.25 mhz q151 c 155 100nf c 153 22pf 22pf 10nf c 156 c 154 mp4 mp5 mp10 mp11 mp12 c 109 6.8pf c 108 1nf c 110 4.7n f r 102 68k c 107 18pf 2 3 1 c 104 6 1 4 3 7 10pf c 106 f102 f101 10nf r 112 47k l 102 2.2 h c 117 10nf d 101 bb804 t101 bfr93a fmv 10nf c 103 d 103 s391d 3.9pf c 102 r 103 680 l 301 5 h t301 bc858c r 121 68k r 122 68k c 311 100nf c 152 330pf c 151 10nf r 151 8.2k r 131 5.6k 1nf r 113 10k c 134 10pf c 301 d 302 s391d d 301 s391d 100nf c 115 100nf c 116 r 106 10 r 152 10 if2 stop data clock en mp6 mp7 mp8 mpx adj feld c 157 10nf mp2 mp3 dplpf hub mp1 ug10v mp9 14522 10nf 100 f c 313 270pf l 7 l 8 68 h68 h 100 nf c 113 r 8 1k c 40 220 nf r 10 390 t302 bc858c r 11 2.2k c 44 220 nf t301 bc848c c 53 mpf102 j109 470k 220 nf r 16 47 c 54 1nf l 9 r 12 2.7k d 102 bb804 2.2 h figure 6. application board schematic
u4255bm rev. a2, 11-oct-00 13 (14) package information 13040 technical drawings according to din specifications package sso44 dimensions in mm 0.25 0.10 0.3 0.8 18.05 17.80 16.8 2.35 9.15 8.65 7.50 7.30 10.50 10.20 0.25 44 23 1 22
u4255bm rev. a2, 11-oct-00 14 (14) ozone depleting substances policy statement it is the policy of atmel germany gmbh to 1. meet all present and future national and international statutory requirements. 2. regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. it is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (odss). the montreal protocol ( 1987) and its london amendments ( 1990) intend to severely restrict the use of odss and forbid their use within the next ten years. various national and international initiatives are pressing for an earlier ban on these substances. atmel germany gmbh has been able to use its policy of continuous improvements to eliminate the use of odss listed in the following documents. 1. annex a, b and list of transitional substances of the montreal protocol and the london amendments respectively 2. class i and ii ozone depleting substances in the clean air act amendments of 1990 by the environmental protection agency (epa) in the usa 3. council decision 88/540/eec and 91/690/eec annex a, b and c (transitional substances) respectively. atmel germany gmbh can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. 2. we reserve the right to make changes to improve technical design and may do so without further notice . parameters can vary in different applications. all operating parameters must be validated for each customer application by the customer. should the buyer use atmel wireless & microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify atmel wireless & microcontrollers against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. data sheets can also be retrieved from the internet: http://www.atmelwm.com atmel germany gmbh, p.o.b. 3535, d-74025 heilbronn, germany telephone: 49 (0)7131 67 2594, fax number: 49 (0)7131 67 2423

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