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features ? fm double-conversion system ? integrated second if filter wi th software-controlled bandwidth ? completely integrat ed fm demodulator ? soft mute and multipat h noise cancellation ? receiving condition analyzer ? am up/down-conversion system ? am preamplifier with agc and stereo capability ? 3-wire bus controlled ? search stop signal ge neration (am and fm) ? automatic alignment possible ? pin compatible with atr4255 ? world tuner, us weatherboard, j-band ? lead-free package electrostatic sensitive device. observe precautions for handling. 1. description the atr4258 is a highly integrated am/fm front-end circuit manufactured using atmel?s advanced bicmos technology. it represents a complete, automatically adjustable am/fm front end, containing a double-conversion system for fm and an up/down-conversion receiver for am with if1 = 10.7 mhz and if2 = 450 khz. the front end is suitable for digital or analog af-signal processing. together with the pll u4256bm, an automatically aligned high-performance am/fm tuner can be built. these ics are dedicated for highly sophisticated car radio applications. am/fm receiver ic atr4258 rev. 4838b?audr?05/05
2 4838b?audr?05/05 atr4258 figure 1-1. block diagram agc mx1ama oplpf mx1amb amagc amvreg amplpf mx1fma mx1fmb gndmx gndo s c o s ce o s cb o s cout agc agc off s et noi s e- b l a nker a u tom a tic a dj us tment m u lti- p a th adj. ch a n. am dem. am mx1oa mx1ob if1ref if1out mx2in mx2oa if2in v 3 p if1fmi if1ami v 3 mx2ob am fm 41 2 3 24 27 3 2 2 8 3 7 6 8 fm o s c divider fm dem. s oft m u te divider 2 to 10 v 3 s top int b us v57 clk gnd fmagc b a ndg a p dev. an a . 16 15 14 1 3 1 2 4 26 29 3 0 33 3 9 ifagcl 3 6 ifagch 3 5 if2out 20 filadj 3 7 multip 40 mpx 11 38 19 22 3 4 3 1 1 8 17 42 25 12 5 9 44 4 3 21 10 v s en data mx2lo adjac int s mute dev meter
3 4838b?audr?05/05 atr4258 2. pin configuration figure 2-1. pinning sso44 1 2 3 4 5 6 7 8 9 10 11 12 1 3 14 15 16 17 1 8 19 20 21 22 44 4 3 42 41 40 3 9 38 3 7 3 6 3 5 3 4 33 3 2 3 1 3 0 29 2 8 27 26 25 24 2 3 mx1ob mx1oa v s mx1ama multip if1ref if1fmi filadj ifagcl ifagch s mute if1ami oplpf dev if1out v 3 if2in v 3 p mx2in gnd mx2oa mx2ob mx1fma mx1fmb mx1amb gndmx fmagc amvreg amagc amplpf meter adjac mpx v57 o s cb o s ce gndo s c o s cout en clk data if2out int mx2lo
4 4838b?audr?05/05 atr4258 3. pin description pin symbol function 1mx1fma1 st mixer fm input a 2mx1fmb1 st mixer fm input b 3 mx1amb 1 st mixer am input b 4 gndmx ground 1 st mixer, preamplifier agc 5 fmagc fm preamplifier agc 6 amvreg am control voltage 7 amagc am preamplifier agc 8 amplpf am agc lp filter 9 meter field strength output 10 adjac adjacent channel detection output 11 mpx multiplex signal 12 v57 5.7v 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 2 nd if amplifier output 21 int interrupt, stop signal 22 mx2lo 10.25 mhz input for 2 nd mixer 23 mx2ob 2 nd mixer output b 24 mx2oa 2 nd mixer output a 25 gnd ground 26 mx2in 2 nd mixer input 27 v3p 3v reference for ampin, amifagc, control, if2in 28 if2in 2 nd if amplifier input 29 v3 3v reference for if1out, mx2in 30 if1out 1 st if amplifier output 31 dev deviation detect output, test output 32 oplpf operating point lpf 33 if1ami 1 st 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 1 st if fm amplifier input 39 if1ref 1 st if & mx1out reference, mx1am a, mx1am b 40 multip multipath detection output 41 mx1ama 1 st mixer am input a 42 vs supply voltage 43 mx1oa 1 st mixer output a 44 mx1ob 1 st mixer output b
5 4838b?audr?05/05 atr4258 4. functional description the atr4258 implements an am up/down-conversion reception path from the rf input signal to the am-demodulated audio frequency output signal, and for fm/wb reception a double-conver- sion reception path from the rf input signal to the fm-demodulated multiplex signal (mpx). a vco and an lo prescaler for am are integrated to generate the lo frequency for the 1 st mixer. automatic gain control (agc) circuits are implemented to control the preamplifier and if stages in the am and fm reception path. for improved fm performance, an integrated if filter with adjustable bandwidth, a softmute fea- ture and an automatic multipath noise cancellation (mnc) circuit are fully integrated. a powerful set of sensors is provided for receiving condition analysis and stop signal generation. several register bits (bit 0 to bit 93) are used to control circuit operation and to adapt certain cir- cuit parameters to the specific application. the control bits are organized in two 8-bit and three 24-bit registers that can be programmed by the 3-wire bus protocol. the bus protocol and the bit-to-register mapping is described in the section ?3-wire bus description? on page 20 . the meaning of the control bits is mentioned in the following sections. the integrated vco has a high frequency range. additionally the vco has a special vco divider which allows (in connection with the vco) the reception of all analog world bands. 4.1 reception mode the ic can be operated in four different modes. mode am, fm, wb, and standby are selected by means of bit 92 and bit 93 according to table 4-1 on page 6 . additionally to the operating modes, the signal pat hs can be set separately. bit 62 selects the first mixer and agc, bit 63 selects the 1 st amplifier stage. the recommended settings of bit 62 and bit 63 are included in table 4-1 on page 6 . in am mode the am mixer, the am rf-agc and the 1 st if am amplifier at pin 33 are activated. the input of the 2 nd if amplifier is connected to pin 28 and the output of the 2 nd if amplifier is fed to the am demodulator. the output of the am demodulator is available at mpx output pin 11. in fm mode the fm mixer, the fm rf-agc and the 1 st if fm amplifier at pin 38 are activated. the bandwidth of the output tank at pin 23, pin 24 is increased and the input of the 2 nd if ampli- fier can be switched between pin 23 and pin 24 and pin 28. the output of the 2 nd if amplifier is fed to the integrated band filter and fm demodulator. the output of the fm demodulator is avail- able at mpx output pin 11. the wb mode is similar to the fm mode, but to reduce the bandwidth the am if amplifier with the am filter (bit 63 = 1) can be used. in wb mode the range of the integrated filter bandwidth control is shifted to lower bandwidth and the gain of the fm demodulator is increased. in standby mode the mixers, if amplifiers and agc circuits are deactivated to reduce current consumption.
6 4838b?audr?05/05 atr4258 4.2 test mode a special test mode is implemented for final production test only. this mode is activated by set- ting bit 9 = 1. this mode is not intended to be used in customer applications. for normal operation, bit 9 has to be set to 0. bit 22 to bit 30 are deactivated in normal operation mode. 4.3 vco/local osci llator prescaler an oscillator circuit is implemente d to build a vco as proposed in the application schematic. the vco frequency is used to generate the lo frequency of the 1 st mixer stages. the control voltage of the vco is usually generated by the pll circuit u4256bm. the vco frequency has a range of 70 mhz to 250 mhz to allow the reception of all analog world bands. a main element of the implemented oscillator circui t is a bipolar npn trans istor. the internally biased base is connected to pin 13 and the emitter to pin 14. an agc circuit (bit 30) can be acti- vated to increase the em itter current until the appropriate oscillation level is reached. the fundamental emitter current can be changed by bit 52. in addition (to the am prescaler) a special vco prescaler is implemented for all modes (am, wb and fm). the divider factor of the prescaler buffer provides the signal of the buffered output (at pin 16) and the prescaler vco provides the signal of the 1 st fm mixer stage and am prescaler. examples of vco prescaler settings are described in section ?application information? on page 29 . the divider factor of the vco and buffer prescaler can be selected according table 4-5 on page 7 . table 4-1. operating mode am/fm/weather channel bit 93 bit 92 bit 63 bit 62 standby 0 0 x x fm 0100 am 1011 weather band 1110 table 4-2. test mode mode bit 9 normal operation 0 test mode 1 table 4-3. local oscillator agc local oscillator (vco) bit 30 agc off (default) 0 agc on 1 table 4-4. local oscillator gain local oscillator (vco) bit 52 low gain 0 high gain 1
7 4838b?audr?05/05 atr4258 note: the u4256 fmoscin (pin 19) input frequency is limited to 160 mhz. 4.4 fm rf-agc the fm rf-agc circuit includes a wide-band level detector at the input pin 1 of the fm mixer and an in-band level detector at the output of the fm if amplifier (pin 30). the outputs of these level detectors are used to control the current into the pin diode (see figure 4-1 ) in order to limit the signal level at the fm mixer input and the following stages. the maximum pin diode current is determined by r115 and the time constant of the agc control loop can be adjusted by chang- ing the value of c111. the agc threshold level at the input of the fm mixer can be adjusted by bit 64 and bit 65 according to table 4-6 . the in-band agc threshold refers to the fm mixer input (pin 1, pin 2) depends on the gain of the fm if amplifier and can be adjusted by bit 89 to bit 91. figure 4-1. fm rf-agc bit 92 table 4-5. local oscillator prescaler (vco/buffer divider) prescaler vco prescaler buffer bit 12 bit 11 bit 10 11x00 1.5 3 001 1.5 1.5 101 22x10 33x11 table 4-6. fm-agc threshold fm-agc threshold bit 65 bit 64 100 dbv 0 0 97 dbv 0 1 94 dbv 1 0 91 dbv 1 1 v s agc b92 pin 42 pin diode pin 5 c111
8 4838b?audr?05/05 atr4258 4.5 am rf-agc the am rf-agc controls the current into the am pin diodes (pin 7) and the source drain voltage of the mosfet in the am preamplifier stage (pin 6) to limit the level at the am mixer input (pin 3, pin 41). this threshold level can be set by bit 64 and bit 65. if the level at the am mixer input exceeds the selected threshold, the current into the am pin diodes is increased. if this step is not sufficient, the source drain voltage of the mosfet is decreased. the time constant of the agc control loop can be adjusted by changing the value of the capacitor at pin 8. 4.6 fm 1 st mixer in the 1 st fm mixer stage, the fm reception frequency is down converted to the 1 st if frequency. the vco frequency is used as lo frequency for the mixer. 4.7 am 1 st mixer the am 1 st mixer is used for up-conversion of the am reception frequency to the 1 st if fre- quency. therefore, an am prescaler is implemented to generate the necessary lo frequency from the vco frequency. the divide factor of the am prescaler can be selected according to table 4-8 . (the am prescaler is only active in am mode). table 4-7. am-agc threshold am-agc threshold bit 65 bit 64 91 dbv 0 0 94 dbv 0 1 97 dbv 1 0 100 dbv 1 1 table 4-8. divide factor of the am prescaler divider (am prescaler) bit 93 bit 92 bit 84 bit 83 bit 82 bit 81 divide by 2 100000 divide by 3 100001 divide by 4 100010 divide by 5 100011 divide by 6 100100 divide by 7 100101 divide by 8 100110 divide by 9 100111 divide by 10 1 0 1 x x x
9 4838b?audr?05/05 atr4258 4.8 fm 1 st if amplifier a programmable gain amplifier is used in fm (and wb) mode between pin 38 and pin 30 to com- pensate the loss in the external ceramic band filters. the gain of this amplifier is adjusted by bit 89 to bit 91. the input and the output resistance is 330 and fits to external ceramic filters. two different temperature coefficients of the fm if amplifier can be selected by bit 66. 4.9 am 1 st if amplifier in am and wb mode, the gain of the 1 st if amplifier is controlled by the if-agc to extend the control range of the if-agc. 4.10 2 nd mixer the 2 nd mixer is used in am, fm and wb mode. the mixer input has 330 input resistance and can be connected directly to an external ceramic filter. in fm mode, the high output resistance of the second mixer is reduced to increase the band- width of the tank at the mixer output. the output resistance can be selected by bit 60 and bit 61. in am and wb mode bit 61 and bit 62 should be set to 0. the lo frequency of the 2 nd mixer (10.25 mhz) has to be applied at pin 22. this signal is usually generated by the pll circuit u4256bm. table 4-9. gain of the fm if amplifier gain fm if bit 91 bit 90 bit 89 19 db 000 21 db 001 23 db 010 25 db 011 27 db 100 28 db 101 29 db 110 30 db 111 table 4-10. temperature coefficient setting of fm if amplifier temperature coefficient (tc) of the if amplifier bit 66 tk min (tk 1) 0 tk max (tk 2) 1 table 4-11. 2 nd mixer output resistance in fm mode bit 61 bit 60 output resistance (bit 54 = 0) output resistance (bit 54 = 1) 0 0 3.3 k ~100 k 0 1 0.63 k 0.78 k 1 0 0.47 k 0.55 k 1 1 0.29 k 0.32 k
10 4838b?audr?05/05 atr4258 note: the bandwidth is also dependant on the values of the application circuit. 4.11 2 nd if amplifier in am and wb mode, the input of the second if amplifier is pin 28, is externally connected to the 2 nd mixer tank through the am ceramic filter to achieve channel selectivity. during normal fm operation (bit 54 = 0), the input of the second if amplifier is connected to the 2 nd mixer output (pin 23, pin 24) and the integrated fm band filter is used for channel sele ctivity only. it is possi- ble to use an additional external filter between the 2 nd mixer tank and pin 28 in fm mode by setting bit 54 to 1. 4.12 if-agc the if-agc controls the level of the 2 nd if signal that is passed to the am demodulator input or the integrated fm band filter and to the 2 nd if output, pin 20. two different time constants of the if-agc can be selected by the capacitors at pin 35 (ifagch) and pin 36 (ifagcl). the short time constant (ifagcl) is used in fm/wb mode and in am search mode. the long time constant (ifagch) is used for am reception. in fm/wb mode, the output signal of the fm demodulator is applied to pin 35 via a series resis- tor of about 95 k . this low-pass filtered output signal of the fm demodulator is used for the fm demodulator fine adjustment, for muting and as a reference for the deviation sensor. table 4-12. fm bandwidth mixer 2 bit 61 bit 60 fm bandwidth mixer 2 0 0 150 khz 0 1 200 khz 1 0 250 khz 1 1 450 khz table 4-13. 2 nd if filter in fm mode 2nd if filter bit 54 internal filter 0 external and internal filter 1 table 4-14. if-agc time constant mode bit 92 bit 88 if agc time constant fm/wb 1 x ifagcl (fast) am reception 0 0 ifagch (slow) am search 0 1 ifagcl (fast)
11 4838b?audr?05/05 atr4258 4.13 2 nd if output the 2 nd if after the gain-controlled 2 nd if amplifier is available at pin 20 (bit 55 = 0). in am mode, this signal may be used for an external am stereo decoder. alternatively, a signal corresponding to the logarithmic field strength after the integr ated fm band filter, which is used for multipath detection, can be switched to pin 20 by setting bit 55 = 1. 4.14 automatic if center frequency adjustment integrated active filters are used in the fm band filter, fm demodulator and adjacent channel sensor. the center frequency of these filters is automatically adjusted to the second if fre- quency of 450 khz. the frequency of 10.25 mhz at pin 22 is used as a reference for this alignment. figure 4-2. automatic if center frequency adjustment for fine tuning, the center frequency of all these integrated active filters (band filter and demod- ulator) can be shifted in steps of 6.25 khz by means of bit 56 to bit 59. additionally, the center frequency of the band filter can be adjusted separately by means of bit 14 to bit 17. table 4-15. pin 20 output setting pin 20 bit 55 2 nd if output 0 multipath field strength 1 pin 3 7 pin 22 10.25 mhz a u tom a tic fre qu ency a dj us tment fm-demod center fre qu ency center fre qu ency fm- ba nd filter bit 14 to 17 bit 56 to 59
12 4838b?audr?05/05 atr4258 table 4-16. 2 nd if center frequency if center bit 59 bit 58 bit 57 bit 56 450.00 khz 0000 456.25 khz 0001 462.50 khz 0010 468.75 khz 0011 475.00 khz 0100 481.25 khz 0101 487.50 khz 0110 493.75 khz 0111 450.00 khz 1000 443.75 khz 1001 437.50 khz 1010 431.25 khz 1011 425.00 khz 1100 418.75 khz 1101 412.50 khz 1110 406.25 khz 1111 table 4-17. fm band filter center frequency correction 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 ?18.75 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 +18.75 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
13 4838b?audr?05/05 atr4258 4.15 integrated fm band filter for fm reception a band filter with variable bandwidth is integrated in front of the demodulator to provide channel selectivity on the 2 nd if. the bandwidth of this filter can be adjusted by bit 0 to 3 (see table 4-18 ) to be suitable for the present receiving condition. in wb mode, the bandwidth of the integrated filter is shifted to lower bandwidth values, while the necessary channel selectiv- ity is achieved by an external ceramic filter. the center frequency of the integrated fm band filter can be adjusted by means of bit 14 to 17. the field strength after the integrated fm band filter that is available at pin 20 (bit 55 = 1) can be used for this purpose. 4.16 fm demodulator for weather band reception, the gain of the fm demodulator is increased and can be adjusted by means of bit 71 and bit 72 in order to increase the output voltage to compensate the low fre- quency deviation in weather band. an integrated demodulator fine adjustment allows automatic fine tuning of the demodulator cen- ter frequency to the average frequency of the received signal. this feature is implemented for use in weather band mode and can be activated by setting bit 53 to 0. figure 4-3. fm demodulator automatic fine tuning table 4-18. bandwidth of the integrated band filter if bandwidth fm (khz) if bandwidth wb (khz) bit 3 bit 2 bit 1 bit 0 220 195 0 0 0 0 ... ... ... ... ... ... 200 160 0 0 1 1 ... ... ... ... ... ... 165 120 0 1 1 0 ... ... ... ... ... ... 130 80 1 0 0 1 ... ... ... ... ... ... 90 45 1 1 0 0 80 not usable 1 1 0 1 70 not usable 1 1 1 0 60 not usable 1 1 1 1 a u tom a tic fre qu ency a dj us tment center fre qu ency fm-demod bit 5 3 mpx (pin 11) v 3 p (pin 27) ifagch (pin 3 5) b92 am agc - +
14 4838b?audr?05/05 atr4258 the center frequency of the fm demodulator can be adjusted by means of bit 56 to 59. at the center frequency, the dc voltage at the mpx output pin 11 is equal to the mpx offset voltage that can be measured at pin 11 while mpx mute is ac tive (bit 7 = 1). this adjustment will affect the center frequency of all integrated filters as mentioned before. 4.17 soft mute the soft mute functionality is implemented to reduce the output level of the fm demodulator at low input signal levels to limit the noise at the mpx output in this case. if the input level falls below an adjustable threshold continuously, the output of the fm demodulator is continuously muted with decreasing input level until a maximum mute value is reached. the threshold for the start of soft mute and the maximum mute can be adjusted. the signal level for 3 db mute can be set by means of bit 68 to bit 70 and the maximum value for soft mute can be selected by bit 67. the steepness and the time constant of the soft mute can be adjusted by the resistor and capac- itor between pin 34 and pin 29. the field strength signal available at pin 9 is used for soft mute. therefore, the soft mute thresh- old that referred to the input of the fm mixer depends on the gain from the fm mixer input to the field strength sensor and on the setting of field strength offset (bit 15 to bit 21). table 4-19. demodulator gain in weather band mode demodulator gain in weather band mode relative to fm mode bit 72 bit 71 14 db 0 0 17 db 0 1 21 db 1 0 23 db 1 1 table 4-20. demodulator fine adjustment demodulator fine adjustment bit 53 fine tuning on 0 fine tuning off 1 table 4-21. soft mute threshold relative soft mute thresh old bit 70 bit 69 bit 68 soft mute off 0 0 0 ?18 db 0 0 1 ?15 db 0 1 0 ?12 db 0 1 1 ?9 db 1 0 0 ?6 db 1 0 1 ?3 db 1 1 0 0 db 1 1 1
15 4838b?audr?05/05 atr4258 figure 4-4. soft mute 4.18 mpx output the output of the am demodulator (am mode) or the output of the fm demodulator (fm/wb mode) are available at the mpx output (pin 11). the mpx output signal can be muted by setting bit 7 to 1. the bandwidth of the low-pass filter at the mpx output can be set by means of bit 79 to 90 khz or 180 khz. 4.19 receiving condition analyzer the atr4258 implements several sensors that provide information about the receiving condition of the selected station. table 4-22. maximum soft mute maximum value of soft mute bit 67 30 db 0 26 db 1 pin 3 4 bit s 6 8 to 70 pin 29 bit 67 v 3 g a in fm demod u l a tor + + - f s (pin 9) table 4-23. mpx output mute mpx output bit 7 mpx out, pin 11 normal operation 0 mute on 1 table 4-24. mpx output bandwidth bandwidth mpx low-pass filter bit 79 90 khz 0 180 khz 1
16 4838b?audr?05/05 atr4258 4.20 field strength sensor the field strength sensor provides a dc voltage at pin 9 which represents the logarithmic field strength of the signal in the reception band. the field strength information can be retrieved either from a level detector at the input of the 2 nd mixer (pin 26) or from the if-agc depending on the setting of bit 80. the bandwidth of the field strength detection in the agc is smaller than by using the level detector because of additional selectivity between the 2 nd mixer and the 2 nd if amplifier particularly in am and wb, but the field strength detection in the agc is limited to the if agc range. usually the field strength from the level detector is used in fm/wb mode and the agc field strength is used in am mode. the field strength output at pin 9 can be adjusted by the bits 18 to 21 in 0.5 db steps. this offset also has an influence on the soft mute levels. 4.21 field strength selection bit 80 and bit 13 allows the switches between narrow-band field strength and wide-band field strength information. 4.22 search stop detector a search stop detector is available in am and fm/wb mode. a stop condition is signaled (with a low level at pin 21) if the frequency of the if signal is within a window around the center fre- quency of 450 khz. the width of this search stop window can be set by bit 85 to bit 87 in the range of 0.5 khz to 80 khz. the frequency of the if signal is measured by counting the number of periods of the if signal during a measurement time which is determined by bit 73 to bit 78. the inverted stop signal is available at pin 21 according to table 4-29 on page 17 . the fre- quency of 10.25 mhz at pin 22 is used as a time reference. table 4-25. field strength offset offset field strength bit 21 bit 20 bit 19 bit 18 0.0 db 0000 0.5 db 0001 1.0 db 0010 ... ... ... ... ... 7.5 db 1111 table 4-26. field strength (combined) field strength (pin 9) narr ow-band/wide-band bit 80 bit 13 fm field strength (wide band) 0 0 multipath field strength and fm field strength (wide band) 0 1 am agc field strength (narrow band) 1 0 multipath field strength and am agc field strength (narrow band) 1 1
17 4838b?audr?05/05 atr4258 note: mpint = multipath interrupt, st op and mpint signal are active low pin 35 (ifagch) is carried along with pin 36 (ifagc l) to avoid crackles during a change of the search stop mode to the am reception mode. 4.23 deviation sensor the deviation sensor is active in am and fm/w b mode and measures the modulation of the sig- nal. it is implemented as a peak detector of the low-pass-filtered mpx signal (see figure 4-5 ). the output voltage at pin 31 is proportional to the frequency deviation in fm/wb or the modulation depth in am respectively. figure 4-5. deviation sensor table 4-27. search stop detector measurement time time window for stop signal bit 78 bit 77 bit 76 bit 75 bit 74 bit 73 1 3.1969 ms 000001 ..... 63 3.1969 ms 111111 table 4-28. search stop window 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 table 4-29. signals available at digital output pin 21 bit 88 bit 92 int (pin 21) 00 (am) 1 0 1 (fm/wb) not mpint 1 0 (am) not stop 1 1 (fm/wb) not (stop and not mpint) pin 3 1 mpx 25 k 4 k +
18 4838b?audr?05/05 atr4258 4.24 adjacent channel sensor the adjacent channel sensor is active in fm mo de only and measures the field strength outside the reception band. figure 4-6. adjacent channel sensor 4.25 mpint and adjac reset bit 6 allows a resets of the multipath sensor and the adjacent channel sensor by connecting pin 10 and pin 40 internally to ground and so t he external capacitors can be discharged very quickly. 4.26 multipath sensor the multipath sensor is active in fm mode only and measures the disturbance due to multipath reception. the multipath sensor detects drops in the field strength after the integrated band filter by calculating the difference between an averaged maximum field strength and the current field strength. the maximum depth of these drops is represented by the voltage of the peak detector at pin 40 (multip). the level of this voltage represents the degree of disturbance in the received signal. figure 4-7. multipath sensor if s meter pin 10 (adjac) pin 9 (meter) 3 0 a + table 4-30. multipath and adjacent channel reset mpint and adjacent channel (pin 10 and pin 40) bit 6 normal mode 0 connection to ground 1 pin 40 4 k +
19 4838b?audr?05/05 atr4258 a multipath noise canceller (mnc) is implemented to reduce disturbance of the received signal in multipath reception conditions. if the di fference between the momentary and the averaged field strength falls below a threshol d adjustable by bit 81 to 84 (see table 4-32 ), the mpx signal may be muted and this situation (mpint) can be signalized at pin 21 (int) according to table 4- 29 on page 17 . muting of the mpx signal during multipath disturbances can be activated be set- ting bit 8. the multipath interrupt can also be switched on/off by bit 4. table 4-31. multipath noise canceller multipath noise canceller bit 8 active 0 not active 1 table 4-32. sensitivity of the mnc sensitivity mnc (threshold) bit 84 bit 83 bit 82 bit 81 off 0000 low 0001 ... ... ... ... ... (?33 db) 0011 ... ... ... ... ... normal (?14 db) 0111 ... ... ... ... ... high (?9 db) 1111 note: valid in fm or wb mode (bit 92 = 1) table 4-33. multipath interrupt (mpint) mpint (pin 21) bit 4 off 0 on (mpint active) 1
20 4838b?audr?05/05 atr4258 4.27 am noise blanker the am noise blanker of the atr4258 can be acti vated by bit 5. the noise peak is detected in the field strength of the first if and if the disturbance exceeds the level defined by the bits 85 to 87, the signal is muted at the second if. 4.28 3-wire b us description the register settings of the atr4258 are programmed by a 3-wire bus protocol. the bus proto- col consists of separate commands. a defined number of bits are transmitted sequentially during each command. one command is used to program all bits of one register. the different registers available (see table 4-36 on page 22 ) are addressed by the length of the command (number of transmitted bits) and by three address bits that are unique fo r each register of a given length. 8-bit registers are programmed by 8-bit commands and 24-bit registers are programmed by 24-bit commands. each bus command starts with a rising edge on the enable lin e (en) and ends with a falling edge on en. en has to be kept high during the bus command. the sequence of transmitted bits during one command starts with the lsb of the first byte and ends with the msb of the last byte of the register addressed. the data is evaluated at the rising edges of clk. the number of low to high transitions on clk during the high period of en is used to determine the length of the command. the bus protocol and the register addressing of the atr4258 are compatible to the addressing used in the u4256bm. that means both the atr4258 and u4256bm can be operated on the same 3-wire bus as shown in the application circuit ( figure 10-9 on page 36 ). table 4-34. am noise blanker activation am noise blanker bit 5 off 0 on 1 table 4-35. sensitivity of am noise blanker am noise blanker sensit ivity bit 87 bit 86 bit 85 low 0 0 0 ..... ... ... ... normal 0 1 1 ... ... ... ... high 1 1 1
21 4838b?audr?05/05 atr4258 figure 4-8. pulse diagram figure 4-9. bus timing en clk data en 8 - b it comm a nd l s bl s b m s b byte 1 byte 2 l s b m s bm s b byte 2 l s bm s b byte 1 24- b it comm a nd clk data clock data enable t r t f t s t l t f t hen t hda t s t r t r t h t f
22 4838b?audr?05/05 atr4258 4.29 data transfer table 4-36. control registers a24_100 msb byte 3 lsb msb byte 2 lsb msb byte 1 lsb addr. demodulator am/fm/wb gain fm if amplifier search width of window am osc divider/multipath sensitivity field strength bw/ mpx/ lpf/ time window stop signal 100 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 soft mute threshhold soft mute depth tk-fm if agc threshold am/fm if1 ampl. am/ fm 1 st mixer + agc am/ fm bw 2 nd mixer int. if2 reference shift ifout pin 20 if2in pin 28 dem. contr. gain local osc 101 b72 b71 b70 b69 b68 b67 b66 b65 b64 b63 b62 b61 b60 b59 b58 b57 b56 b55 b54 b53 b52 a24_111 msb byte 3 lsb msb byte 2 lsb msb byte 1 lsb addr. agc local osc do not change (test mode bits) offset fi eld strength (pin 9) band-path filter fieldst. (pin 9) local osc prescaler (vco buffer) 1110 0000 0 0 00 b30 b29 b28 b27 b26 b25 b24 b23 b22 b21 b20 b19 b18 b17 b16 b15 b14 b13 b12 b11 b10 a8_100 msb byte 1 lsb addr. te s t mode mp mute (pin 11) reset mp/ adj noise- blanker 1000 b9 b8 b7 b6 b5 a8_101 msb byte 1 lsb addr. mp int band-path filter band width 101 b4 b3 b2 b1 b0
23 4838b?audr?05/05 atr4258 5. absolute maximum ratings stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions beyond t hose indicated in the operational sections of this specification is not implied. exposure to absolute maximum rati ng conditions for extended periods may affect device reliability . all voltages are referred to gnd (pin 25) parameters symbol value unit supply voltage, pin 42 v s 10 v power dissipation p tot 1000 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 6. thermal resistance parameters symbol value unit junction ambient, soldered to pcb r thja 60 k/w 7. operating range all voltages are referred to gnd (pin 25) parameters symbol min. typ. max. unit supply voltage range, pin 42 v s 8.0 8.5 10 v ambient temperature t amb ?40 +85 c 8. electrical characteristics test conditions (unless otherwise specified): v s = 8.5v, t amb = 25c no. parameters test conditions pi n symbol min. typ. max. unit type* 1power supply 1.1 supply voltage 42 v s 8.0 8.5 10 v c 1.2 supply current standby mode (bit 92 = 0, bit 93 = 0) 42 i stby 35 45 ma a 1.3 supply current other operation modes 42 i s 50 65 ma a 2 vco (bit 52 = 0, bit 30 = 1) 2.1 frequency range f vco 70 260 mhz d 2.2 dc bias voltage 13 3.4 3.7 4.0 v a 2.3 buffer output voltage f osc = 120 mhz 16 250 mvrms c 2.4 buffer output resistance 16 70 d 2.5 buffer output dc voltage 16 3.8 4.1 4.4 v a 3 fm rf-agc 3.1 saturation voltage no input signal 58.3 va 3.2 saturation voltage no input signal 5v s ? 0.2 v b 3.3 threshold level in-band signal 30 115 dbv c *) type means: a =100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter
24 4838b?audr?05/05 atr4258 3.4 maximum threshold level out-of-band signal (110 mhz), bit 64, 65 = 0 1 100 103 106 dbv b 4 am rf-agc, am mode (bit 92 = 0, bit 93 = 1) 4.1 saturation voltage no input signal 7 8.3 v c 4.2 saturation voltage no input signal 7 v s ? 0.2 v c 4.3 output voltage for minimum gain bit 92 = 1 7 6.5 6.8 7.1 v c 4.4 output voltage for minimum gain bit 92 = 1 7 v s ? 1.7 v c 4.5 maximum control voltage no signal 6 6.5 7.0 7.5 v a 4.6 maximum control voltage no signal 6 v s ? 1.5 v b 4.7 minimum control voltage agc active 6 0.2 0.8 v a 4.8 maximum threshold level bits 64, 65 = 1 41 97 99 102 dbv a 5 am mixer, am mode (bit 92 = 0, bit 93 = 1) 5.1 supply current sum of current in pins 43, 44 43, 44 14 16 20 ma a 5.2 conversion conductance 3, 41, 43, 44 4.1 ms d 5.3 3 rd -order input intercept point pin 3 ac-grounded 41 ip3 ammix 132 dbv c 5.4 noise figure (ssb) generator resistance 2.5 k (pin 41) 43, 44 nf ammix 12 db c 5.5 input bias dc voltage 3, 41 2.45 2.8 3.1 v a 5.6 input resistance single-ended, pin 39 ac-grounded 3, 41 13 k d 5.7 input capacitance 3, 41 3 pf d 5.8 maximum output voltage differential 43, 44 12 vpp d 5.9 output resistance 43, 44 100 k d 6 fm mixer (fm mode (bit 92 = 1, bit 93 = 0) 6.1 supply current sum of current in pins 43, 44 43, 44 12 15 20 ma a 6.2 conversion conductance 1, 2, 43, 44 7msd 6.3 3 rd -order intercept point 1, 2 ip3 fmmix 125 dbv c 6.4 noise figure (dsb) generator resistance 200 43, 44 nf fmmix 10 db c 6.5 input resistance 1, 2 1.6 k d 6.6 input capacitance pin 2 ac-grounded 1 5 pf d 8. electrical characteristics (continued) test conditions (unless otherwise specified): v s = 8.5v, t amb = 25c no. parameters test conditions pi n symbol min. typ. max. unit type* *) type means: a =100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter
25 4838b?audr?05/05 atr4258 6.7 maximum differential output voltage v s = 8.5v 43, 44 12 vpp d 6.8 output resistance 43, 44 100 k d 71 st if fm amplifier, fm mode (bit 92 = 1, bit 93 = 0) 7.1 minimum voltage gain bits 89, 90, 91 = 0 38, 30 19 21 23 db b 7.2 temperature coefficient of gain bit 66 = 0 tk min 0.039 db/k d 7.3 temperature coefficient of gain bit 66 = 1 tk max 0.044 db/k d 7.4 input resistance pin 39 ac-grounded 38 270 330 400 d 7.5 input capacitance pin 39 ac-grounded 38 5 pf d 7.6 output resistance 30 270 330 400 d 81 st if am amplifier, am mode (bit 92 = 0, bit 93 = 1) 8.1 maximum voltage gain 330 load at pin 30 30, 33 16 db d 8.2 gain control range 26 db d 8.3 noise figure generator resistance 2.5 k nf ifam 17 db d 8.4 input resistance 33 10 k d 8.5 input capacitance pin 39 ac-grounded 33 1 pf d 8.6 output resistance 30 270 330 400 d 92 nd mixer 9.1 fm supply current bit 92 = 1, bit 93 = 0 23, 24 10 12 16 ma a 9.2 am/wb supply current bit 92 = 0, bit 93 = 1 23, 24 7 8 10 ma a 9.3 conversion conductance 26, 23, 24 2msd 9.4 noise figure (ssb) generator resistance 330 (pin 26) 23, 24 nf mix2 23 db c 9.5 3 rd -order input intercept point 26 ip3 mix2 132 dbv c 9.6 am/wb output resistance bit 92 = 0, bit 93 = 1 23, 24 100 k d 9.7 maximum differential output voltage am/wb v s = 8.5v 23, 24 12 vpp d 9.8 maximum differential output voltage fm 23, 24 1 vpp d 9.9 input resistance 26 270 330 400 d 9.10 lo input voltage 22 80 500 mvpp d 9.11 lo input resistance 22 1 k d 9.12 lo input bias voltage 22 2.8 3.0 3.2 v a 8. electrical characteristics (continued) test conditions (unless otherwise specified): v s = 8.5v, t amb = 25c no. parameters test conditions pi n symbol min. typ. max. unit type* *) type means: a =100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter
26 4838b?audr?05/05 atr4258 10 2 nd if amplifier (bit 55 = 0) 10.1 input resistance pin 27 ac-grounded 28 3 k d 10.2 voltage gain am/wb mode (bit 93 = 1) pin 28 1 mvrms 28, 20 42 45 48 db a 10.3 gain control range am/wb mode (bit 93 = 1) 47 db d 10.4 dc output voltage 20 3.4 3.7 4.0 v a 10.5 ac output voltage unmodulated signal, 82 dbv at pin 1 (if agc active) bit 93 = 1 20 150 180 230 mvrms a 10.6 output impedance small signal 20 70 d 11 fm demodulator integr ated band-filter, fm mode (bit 92 = 1, bit 93 = 0), bw setting 2 nd if filter = 120 khz 11.1 ac output voltage deviation = 75 khz, f mod = 1 khz 11 420 480 540 mvrms b 11.2 stereo roll-off deviation = 75 khz, f mod = 38 khz (reference: 1 khz) 11 ?2.0 db d 11.3 total harmonic distortion deviation = 75 khz, f mod = 1 khz 11 thd fm 0.4 0.7 % a 11.4 maximum signal-to-noise ratio dev. = 22.5 khz, f mod = 1 khz, 50 s de- emphase, signal input at 450 khz 11 (s/n) fm 65 db c 12 soft mute, fm mode (bit 92 = 1, bit 93 = 0, bit 80 = 0) 12.1 mute gain bit 67 = 0, v (pin 34) = 2v 11 ?28 ?26 ?24 db a 12.2 mute gain bit 67 = 1, v (pin 34) = 2v 11 ?24 ?22 ?20 db a 13 am demodulator, am mode (bit 92 = 0, bit 93 = 1) 13.1 ac output voltage modulation depth = 30%, f mod = 1 khz 11 135 150 170 mvrms a 13.2 total harmonic distortion modulation depth = 80%, f mod = 1 khz v(pin 35) = const. 11 thd am 0.6 2 % a 13.3 maximum signal-to-noise ratio modulation depth = 30%, f mod = 1 khz 74 dbv at pin 41 11 (s/n) am 54 db c 14 mpx output 14.1 dc output voltage bit 7 = 1 11 2.1 2.3 2.5 v a 14.2 mute gain bit 7 = 1, fm dev. = 75 khz, f mod = 1 khz 11 ?65 ?50 db a 14.3 output resistance small signal 11 60 d 8. electrical characteristics (continued) test conditions (unless otherwise specified): v s = 8.5v, t amb = 25c no. parameters test conditions pi n symbol min. typ. max. unit type* *) type means: a =100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter
27 4838b?audr?05/05 atr4258 15 search stop detector, int output 15.1 low saturation voltage 21 0 0.5 v a 15.2 low output resistance 21 0.3 k d 15.3 high saturation voltage 21 4.5 4.8 5.25 v a 15.4 high output resistance 21 1 k d 16 deviation sensor, fm mode (bit 92 = 1, bit 93 = 0) 16.1 offset voltage fm dev. = 0 khz fm demodulator adjusted 31 0.2 v c 16.2 output voltage fm dev. = 75 khz, f mod = 1 khz 31 1.7 2.0 2.5 v c 17 field strength sensor, fm mode (bit 92 = 1, bit 93 = 0, bit 89 to 91 = 0, bit 80 = 0, bit 18 to 21 = 0) 17.1 output voltage 60 dbv at pin 33 9 0.8 1.3 1.8 v a 17.2 output voltage unmodulated signal 100 dbv at pin 33 92.83.43.9va field strength sensor, am mode (bit 92 = 0, bit 93 = 1, bit 80 = 1, bit 18 to 21 = 0) 17.3 output voltage low field strength 60 dbv at pin 28 9 1.5 1.8 2.1 v a 17.4 output voltage high field strength 94 dbv at pin 28 9 3.0 3.3 3.6 v a 18 multipath sensor, fm mode (bit 92 = 1, bit 93 = 0) 18.1 offset voltage unmodulated signal, 60 dbv at pin 1 40 0 200 mv a 18.2 output voltage am modulation depth = 60%, f mod = 20 khz, 60 dbv at pin 1 40 1.5 1.9 2.4 v a 19 adjacent channel sensor, fm mode (bit 92 = 1, bit 93 = 0), bit 4 = 0 (default bw setting) 19.1 offset voltage unmodulated signal 10 200 mv c 19.2 19.3 output voltage am mod. 10% f mod = 100 khz am mod. 60% f mod = 100 khz 10 1.2 0.3 1.9 0.6 2.5 va 20 3-wire bus 20.1 input voltage low 17, 18, 19 0.8 v d 20.2 input voltage high 17, 18, 19 2.7 v d 20.3 leakage current v = 0v, 5v 17, 18, 19 10 a d 20.4 clock frequency 18 1.0 mhz d 20.5 period of clk high low t h t l 250 250 ns ns d 8. electrical characteristics (continued) test conditions (unless otherwise specified): v s = 8.5v, t amb = 25c no. parameters test conditions pi n symbol min. typ. max. unit type* *) type means: a =100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter
28 4838b?audr?05/05 atr4258 20.6 rise time en, data, clk t r 400 ns d 20.7 fall time en, data, clk t f 100 ns d 20.8 set-up time t s 100 ns d 20.9 hold time en t hen 250 ns d 20.10 hold time data t hda 0nsd 21 internally generated reference voltages 21.1 output voltage 12 5.5 5.7 6.0 v a 21.2 output voltage 29 3.0 v d 21.3 output voltage 27 3.0 v d 21.4 output voltage 39 3.0 v d 8. electrical characteristics (continued) test conditions (unless otherwise specified): v s = 8.5v, t amb = 25c no. parameters test conditions pi n symbol min. typ. max. unit type* *) type means: a =100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter
29 4838b?audr?05/05 atr4258 9. application information 9.1 am prescaler (d ivider) settings the am mixer is used for up conversion of the am reception frequency to the if frequency. therefore an am prescaler is implemented to generate the necessary lo from the vco fre- quency. for the reception of the am band different prescaler (divider) settings are possible. table 9-1 gives an example for the am prescaler (divider) settings and the reception frequencies. e.g., f vco = 98.2 mhz ... 124 mhz f if = 10.7 mhz note: prescaler vco divider = 1 in this example. table 9-1. am prescaler (divider) settin gs and reception frequencies divider (am prescaler) minimum reception frequency [mhz] maximum reception frequency [mhz] divide by 2 38.4 51.3 divide by 3 20.033 30.633 divide by 4 13.85 20.3 divide by 5 8.94 14.1 divide by 6 5.667 9.967 divide by 7 3.329 7.014 divide by 8 1.575 4.8 divide by 9 0.211 3.078 divide by 10 0 1.7 f rec f vco am prescaler ----------------------------------- - ?? ?? f if ? =
30 4838b?audr?05/05 atr4258 9.2 local oscillator an d am prescaler settings table 9-2 gives an example for the vco prescaler divider and am prescaler divider settings and the reception frequencies. e.g., f vco = 195.9 mhz ... 237.9 mhz f if = +10.7 mhz or ? 10.7 mhz f vco = (f rec + f if ) vco prescaler am prescaler 9.3 u4256 n- and r-divider calculation 9.3.1 am mode 9.3.2 fm/wb mode table 9-2. vco and am prescaler (divider) settings and reception frequencies band prescaler vco if [mhz] minimum reception frequency [mhz] maximum reception frequency [mhz] minimum vco frequency maximum vco frequency am prescaler fm 2 +10.7 87.5 108 196.4 237.4 ? wb 1.5 ?10.7 162.4 162.55 227.55 227.775 ? jpn 3 ?10.7 76 90 195.9 237.9 ? lw/mw 2 +10.7 0.15 1.605 195.3 221.49 9 16m 1 +10.7 17.5 17.9 225.6 228.8 8 120m 2 +10.7 2.3 2.5 208 211.2 8 n f vco vco-divider am prescaler f step --------------------------------------------------------------------------------------------- - = f rec f vco vco-divider am prescaler --------------------------------------------------------------------------- - ?? ?? f if ? = n f vco vco-divider f step -------------------------------------------------- = f rec f vco vco-divider -------------------------------- ?? ?? f if ? =
31 4838b?audr?05/05 atr4258 9.3.3 all modes f ref = reference oscillator fr equency (e.g. 10.25 mhz) f vco = vco frequency f rec = reception frequency f step = step frequency (of the pll) 10. diagrams the following data was measured with the application board (see figure 10-9 ). in the measurement setup, a 50 generator is terminated by 50 and connected to the antenna input by a 50 series resistor to achieve 75 termination at the antenna input. the generator level specified is the ou tput voltage of this 50 generator at 50 load. if the application board is replaced by a 75 resistor, the voltage at this resistor is 6 db below the specified voltage level of the 50 generator. figure 10-1. fm demodulator note: integrated band-filter bw setting: 120 khz (bits 0 to 2 = 0, bit 3 = 1); 1 khz modulation frequency; 50 s de-emphasis (thd) r f ref f step ---------- = 0.9 0. 8 0.7 0.6 0.5 0.4 0. 3 0.2 0.1 0 1.0 0.9 0. 8 0.7 0.6 0.5 0.4 0. 3 0.2 0.1 0 1.0 thd (%) mpx output volta g e (vrm s ) 01020 3 040506070 8 0 90 100 frequency deviation (khz) mpx thd + 8 5c -40c + 8 5c -40c
32 4838b?audr?05/05 atr4258 figure 10-2. multipath sensor note: am modulation frequency 20 khz; generator level 40 dbv figure 10-3. multipath sensor frequency response note: generator level 40 dbv 0 1 2 3 5 s en s or output volta g e (v) 01020 3 040 5060 70 8 0 90 100 am modulation depth (%) + 8 5c -40c 4 4.0 3 .5 5.0 4.5 2.0 1.5 1.0 0.5 0 3 .0 2.5 s en s or output volta g e (v) 100 1000 10000 10000 am modulation frequency (hz) 90 % a t -40c 90 % a t 25c 60 % a t 8 5c 60 % a t -40c 60 % a t 25c
33 4838b?audr?05/05 atr4258 figure 10-4. deviation sensor note: fm modulation frequency: 1 khz; bw setting 2 nd if filter = 120 khz; demodulator fine tuning (bit 53 = 0) the center frequency of the integrated band filter has to adjusted (e.g., if center frequency = 462.50 khz). figure 10-5. deviation sensor frequency response note: fm frequency deviation: 22.5 khz deviation s en s or output volta g e (v) 10000 3 0000 50000 70000 90000 frequency deviation (hz) 0 1 2 3 5 4 + 8 5c -40c 1.0 0.4 0.2 0 0. 8 0.6 s en s or output volta g e (v) 100 1000 10000 10000 fm modulation frequency (hz)
34 4838b?audr?05/05 atr4258 figure 10-6. fm input level sweep note: soft mute threshold bits 68, 69 = 0, bit 70 = 1; soft mute gain bit 67 = 0 gain fm if amplifier bit 89 to 91 = 1 figure 10-7. selectivity note: integrated bandfilter bw setting: 120 khz desired signal level adjusted to 40 db s/n without undesired signal undesired signal level adjusted to 26 db s/n 10 -10 -20 - 3 0 -40 -50 -60 -70 0 5.0 4.5 4.0 3 .5 3 .0 2.5 2.0 1.5 1.0 0.5 field s tren g th s en s or output volta g e (v) mpx output (db) -10 10 20 3 040506070 8 0 90 100 110 120 0 input level (dbv) 10 20 0 -10 -20 - 3 0 -40 -50 -60 -70 pde s /punde s (db) 4.5 4.0 3 .5 3 .0 2.5 2.0 1.5 1.0 0.5 0 adjacent channel output vollta g e (v) - 3 00 -250 -200 -150 -100 -50 50 100 150 200 250 3 00 0 frequency off s et (khz) pde s /p u nde s adj a cent
35 4838b?audr?05/05 atr4258 figure 10-8. test circuit 1 2 3 4 5 6 7 8 9 10 11 12 1 3 14 15 16 17 1 8 19 20 21 22 44 4 3 42 41 40 3 9 38 3 7 3 6 3 5 3 4 33 3 2 3 1 3 0 29 2 8 27 26 b us te s t point q ua rz- o s cill a tor 10.25 mhz 25 24 2 3 v s v s 100 nf 10 nf 10 nf 10 nf 10 nf 10 nf 10 nf 1 f 10 nf 100 nf 100 nf atr425 8 10 nf 47 nf 100 nf 10 nf p29 p 3 1 47 nf p29 p29 47 nf 47 nf 22 nf 47 nf v s 50 50 50 200 k 50 50 50 50 50 100 nf 50 50 50 50 33 0 10 nf 10 nf 10 nf 10 nf 50 1. 3 k 10 k 50 v
36 4838b?audr?05/05 atr4258 figure 10-9. application circuit 44 4 3 42 41 40 3 9 38 3 7 3 6 3 5 3 4 33 3 2 3 1 3 0292 8 27 26 25 24 2 3 12 3 4567 8 9 1011121 3 14 15 16 17 1 8 19 20 21 22 atr425 8 u4256bm 20 19 1 8 17 16 15 14 1 3 12 11 12 3 4567 8 910 1.5 k r 3 05 1 k r 3 0 3 kf 3 02 3 90 r 3 1 3 2.2 k r 3 11 6 8 k r102 47 k r112 l102 l 3 0 3 2.2 mh 2.2 h l 3 01 4.7 h 100 h 6 8 k fm 75 ant r121 470n c204 c201 c209 100 n c 3 0 8 100 nf c 3 07 t102 bc 8 5 8 t 3 02 bc 8 4 8 t111 j109 t 3 01 bc 8 5 8 c t101 bfr9 3 a 10 nf 10 nf c1 3 1 f1 3 1 d 3 1 bb 8 04 47 pf c1 3 2 c155 100 nf c15 8 10 nf c159 10 nf c157 10 nf c15 3 10 pf c154 10 pf 22 pf c10 8 1 nf c104 10 nf c109 f101 d102 bb 8 04 d101 bb 8 04 6. 8 pf c107 1 8 pf c77 470 pf q151 dac 3s wo1 s wo 3 s wo2 s wo4 10.25 mhz c1 3 4 1 nf c10 3 d10 3 s3 91d d 3 01 d 3 02 s3 91d s3 91d 10 nf c102 3 .9 pf 10 f 2.2 f 1 f + + + + c205 22 f c20 3 100 nf + c11 3 c110 4.7 nf c111 10 nf 6. 8 pf c 3 19 220 nf c 3 15 12 pf c 3 06 10 pf c106 27 pf c56 220 nf c 3 16 10 f c112 1 f c111 1 nf c117 10 nf c206 c202 r111 200 k r29 10 r 3 04 5.6 k r407 v s (+ 8 .5v to 10.5v) multip dev 10 r 33 2 k r152 10 r41 1.2 k r 3 4 27 220 n 100 p c in f201 l 3 02 f102 f201 c207 220 n f 3 02 c 3 09 c27 220 n c20 8 10 nf 10 nf c 3 12 1 nf c 3 10 c156 10 nf c151 33 0 pf c152 x 3 01 kr201 220 n c114 6. 8 pf c1 33 c116 100 nf c115 100 nf r106 10 k r 3 2 1 k r1 3 1 5.6 k r151 8 .2 k r115 1 k r105 100 r 3 06 470 k kr202 r10 3 1 k r 3 0 8 2.2 k 10 nf c 3 02 r 3 07 47 r104 470 6 8 k r122 100 n c 3 11 int if2out data clk en gnd mpx adjac meter
37 4838b?audr?05/05 atr4258 12. package information 11. ordering information extended type number package remarks atr4258-ilsh sso44 tube, lead-free ATR4258-ILQH sso44 taped and reeled, lead-free 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
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