View ATR4255P-ILSH_6803219.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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 generation for am and fm automatic alignment possible lead-free package electrostatic sensitive device. observe precautions for handling. 1. description the atr4255p 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 atr4256, an automatically aligned high-performance am/fm tuner can be built. these ics are designed for highly sophisticated car radio applications. am/fm receiver ic atr4255p rev. 4883a?audr?09/05
2 4883a?audr?09/05 atr4255p figure 1-1. 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 band gap meter v57 gnd vs 12 25 42 9 v3 adjac mx2lo 22 10 dev int multip smute 21 40 34 31 int adjacent channel stop multi- path agc am dem. 32 36 35 37 11 oplpf ifagcl ifagch filadj mpx automatic adjustment soft mute dev. analog fm dem.
3 4883a?audr?09/05 atr4255p 2. pin configuration figure 2-1. pinning sso44 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 mx2oa mx2ob if1ref if1fmi filadj mx1am a 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
4 4883a?audr?09/05 atr4255p table 2-1. 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 and mx1out reference, mx1ama, mx1amb 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 4883a?audr?09/05 atr4255p 3. functional description the atr4255p implements an am up/down-conversion reception path from the rf input signal to the am-demodulated audio frequency output signal, and for fm 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 soft mute 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. see section ?3-wire bus description? on page 19 for the bus protocol and the bit-to-register mapping. the meaning of the control bits is described in the following sections. 3.1 reception mode the ic can be operated in four different modes; modes am, fm, weather band (wb), and standby are selected by means of bits 92 and 93 as shown in table 3-1 . 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 pins 23 and 24 is increased and the input of the 2 nd if amplifier can be switched between pins 23, 24 and 28. the output of the 2 nd if amplifier is fed to the integrated bandfilter and fm demodulator. the output of the fm demodulator is available at mpx output, pin 11. wb mode is similar to fm mode, but the input of the 2 nd if amplifier is fixed to pin 28, the range of the bandwidth control of the integrated band filter 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. table 3-1. operating mode am/fm/weather channel bit 93 bit 92 standby 0 0 fm 0 1 am 1 0 weather band (wb) 1 1
6 4883a?audr?09/05 atr4255p 3.2 test mode a special test mode is implemented for final production test only. this mode is activated by set- ting bit 9 to ?1?. this mode is not intended to be used in customer applications. for normal operation, bit 9 has to be set to ?0?. bits 18 to 30 are deactivated in normal operation mode. 3.3 vco 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 circ uit atr4256. the vco signal is provided at the buffered output pin 16 to be fed to the pll circuit. 3.4 fm rf-agc the fm rf-agc circuit includes a wideband 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 3-1 ) 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 bits 64 and 65 as shown in table 3-3 . the in-band agc threshold referred to the fm mixer input (pin 1, pin 2) depends on the gain of the fm if amplifier and can be adjusted using bits 89 to 91. figure 3-1. fm rf-agc bit 92 table 3-2. test mode mode bit 9 normal operation 0 te s t m o d e 1 agc b92 pin diode vs pin 42 pin 5 c111 r115
7 4883a?audr?09/05 atr4255p 3.5 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 inputs (pin 3, pin 41). this threshold level can be set by bits 62 and 63 ( table 3-4 ). 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 con- stant of the agc control loop can be adjusted by changing the value of the capacitor at pin 8. 3.6 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. 3.7 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 as shown in table 3-5 . table 3-3. fm-agc threshold fm-agc threshold bit 65 bit 64 104 dbv 0 0 101 dbv 0 1 98 dbv 1 0 92 dbv 1 1 table 3-4. am-agc threshold am-agc threshold bit 63 bit 62 99 dbv 0 0 102 dbv 0 1 104 dbv 1 0 105 dbv 1 1 table 3-5. divide factor of the am prescaler divider am prescaler bit 93 bit 92 bit 84 bit 83 bit 82 bit 81 divide by 10 1 0 x 0 0 0 divide by 6 10x001 divide by 7 10x010 divide by 8 10x100 divide by 4 10x101
8 4883a?audr?09/05 atr4255p 3.8 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 filt ers. the gain of this amplifier is adjusted by bits 89 to 91 ( table 3-6 ). the input and the output resistance is 330 ? , and fits to external ceramic filters. two different temperature coefficients (tc) of the fm if amplifier can be selected by setting bit 66 ( table 3-7 ). 3.9 am 1 st if amplifier in am mode, the gain of the 1 st if amplifier is controlled by the if-agc to extend the control range of the if-agc. 3.10 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 out put resistance can be sele cted by bits 60 and 61 ( table 3-8 ). 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 atr4256. table 3-6. gain of the fm if amplifier gain fm if bit 91 bit 90 bit 89 20 db 0 0 0 22 db 0 0 1 24 db 0 1 0 26 db 0 1 1 28 db 1 0 0 29 db 1 0 1 30 db 1 1 0 31 db 1 1 1 table 3-7. temperature coefficient setting of fm if amplifier temperature coefficient (tc) of the if amplifier bit 66 tk min 0 tk max 1 table 3-8. 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 ?
9 4883a?audr?09/05 atr4255p 3.11 2 nd if amplifier in am and wb mode, the input of the second if amplifier is pin 28, which 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 out- put (pin 23 and pin 24) and the integrated fm band filter is used for channel selectivity only. it is possible to use an additional external filter between the 2 nd mixer tank and pin 28 in fm mode by setting bit 54 to ?1?. 3.12 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 bandfilter, 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 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 3-9. fm bandwidth (bw) mixer 2 bit 61 bit 60 fm bw mixer 2 0 0 150 khz 0 1 200 khz 1 0 250 khz 1 1 450 khz note: the bandwidth also depends on the values of the application circuit. table 3-10. 2 nd if filter in fm mode 2 nd if filter bit 54 internal filter 0 external and internal filter 1 table 3-11. 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)
10 4883a?audr?09/05 atr4255p 3.13 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 f or an external am stereo decoder. alternatively, a signal corre- sponding to the logarithmic field strength after the integrated fm band filter, which is used for multipath detection, can be switched to pin 20 by setting bit 55 to ?1?. 3.14 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 3-2. automatic if center frequency adjustment for fine tuning, the center frequency of all thes e integrated active filters (band filter, demodula- tor, and adjacent channel sensor) can be shifted in steps of 6.25 khz using bits 56 to 59 ( table 3-13 on page 11 ). additionally, the center frequency of the band filter can be adjusted separately by means of bits 14 to 17, if bit 4 is set to ?1?. if bit 4 is set to ?0?, the default setting is used. table 3-12. pin 20 output setting pin 20 bit 55 2 nd if output 0 multipath field strength 1 automatic frequency adjustment fm demod. fm band filter adj. channel sensor + + bit 56 to 59 10.25 mhz bit 14 to 17 bits 5 and 6 center freq. center freq. center freq. pin 37 pin 22
11 4883a?audr?09/05 atr4255p 1 table 3-13. 2 nd if center frequency 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 table 3-14. 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
12 4883a?audr?09/05 atr4255p 3.15 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 using bits 0 to 3 ( table 3-15 ) to be suitable for the present receiving condition. in wb mode, the band- width of the integrated filter is shifted to lo wer bandwidth values, while the necessary channel selectivity is achieved by an external ceramic filter. the center frequency of the integrated fm band filter can be adjusted using bits 14 to 17 (bit 4 set to ?1?). the field strength after the integrated fm band filter that is available at pin 20 (bit 55 set to ?1?) can be used for this purpose. 3.16 fm demodulator for weather band reception, the gain of the fm demodulator is increased and can be adjusted by means of bits 71 and 72 ( table 3-16 on page 13 ) in order to increase the output voltage to compensate the low frequency 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 recei ved signal. this feature is implemented for use in weather band mode, and can be activated by setting bit 53 to ?0?. table 3-15. bandwidth of the integrated fm band filter if bandwidth 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
13 4883a?audr?09/05 atr4255p figure 3-3. fm demodulator automatic fine tuning the center frequency of the fm demodulator can be adjusted by means of bits 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. 3.17 soft mute the soft mute functionality is implemented to reduce the output level of the fm demodulator at low input signal levels, and to limit the noise at mpx output at low input signal levels. if the input level falls below an adjustable threshold, continuously the output of the fm demodulator is con- tinuously 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 bits 68 to 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 capacitor between pins 34 and 29. the field strength signal available at pin 9 is used for soft mute. therefore, the soft mute thresh- old referred to the input of the fm mixer depends on the gain from fm mixer input to the field strength sensor. table 3-16. demodulator gain in weather band mode demodulator gain in weather band mo de relative to fm mode bit 72 bit 71 12 db 0 0 15 db 0 1 18 db 1 0 21 db 1 1 table 3-17. demodulator fine adjustment demodulator fine adjustment bit 53 fine tuning on 0 fine tuning off 1 fm demod. + (10 nf) am agc b92 center freq. bit 53 automatic frequency adjustment mpx ifagch v3
14 4883a?audr?09/05 atr4255p figure 3-4. soft mute 3.18 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? ( table 3-20 ). the bandwidth of the low-pass filter at the mpx output can be set to 90 khz or 180 khz using bit 79 ( table 3-21 on page 15 ). table 3-18. soft mute threshold relative soft mute threshold 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 table 3-19. maximum soft mute maximum value of soft mute bit 67 28 db 0 24 db 1 pin 34 pin 29 + v3 bit 67 fs (pin 9) bits 68 to 70 gain fm demodulator table 3-20. mpx output mute mpx output bit 7 mpx out, pin 11 normal operation 0 mute on 1
15 4883a?audr?09/05 atr4255p 3.19 receiving condition analyzer atr4255p implements several sensors that provide information about the receiving condition of the selected station. 3.20 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 when using the level detector because of addi- tional 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 mode and the agc field strength is used in am mode. 3.21 search stop detector a search stop detector is available in am and fm/wb mode. a stop condition is signaled if the frequency of the zf signal is within a window around the center frequency of 450 khz. the width of this search stop window can be set in the range of 0.5 khz to 80 khz using bits 85 to 87. the frequency of the zf signal is measured by counting the number of periods of the zf signal dur- ing a measurement time which is determined by the value of bits 73 to 78. the inverted stop signal is available at pin 21 as shown in table 3-25 on page 16 . the frequency of 10.25 mhz at pin 22 is used as time reference. table 3-21. mpx output bandwidth bandwidth mpx low-pass filter bit 79 90 khz 0 180 khz 1 table 3-22. field strength selection field strength narrow band/wide band bit 80 field strength at pin 26 (wide band) 0 field strength from if-agc (narrow band) 1 table 3-23. 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 1 1 1 1 1 1
16 4883a?audr?09/05 atr4255p 3.22 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 3-5 ). the output voltage at pin 31 is proportional to the frequency deviation in fm/wb or the modulation depth in am. figure 3-5. deviation sensor 3.23 adjacent channel sensor the adjacent channel sensor is active only in fm mode, and measures the field strength outside the reception band. by setting the center frequenc y of the band filter of the adjacent channel sensor below or above the 2 nd if frequency (bits 5 and 6), it can be determined whether the dis- turbance signal is located above or below the reception frequency (see table 3-28 on page 18 ). the bandwidth of the band filter used in the ad jacent channel sensor can be changed by means of bits 10 to 13. if bit 4 = 0, the default bandwidth setting is used. the output of the adjacent channel sensor is independent of the bandwidth setting of the integrated fm band filter. table 3-24. 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 100 20 khz 101 40 khz 110 80 khz 111 table 3-25. signals available at digital output pin 21 bit 88 bit 92 int (pin 21) 00 (am) 1 0 1 (fm/wb) not mpint 10 (am) not stop 1 1 (fm/wb) not (stop and not mpint) mpx pin 31 4k 25k +
17 4883a?audr?09/05 atr4255p figure 3-6. adjacent channel sensor table 3-26. bandwidth (bw) of the adjacent channel detector filter bw adjustment bit 13 bit 12 bit 11 bit 10 3 khz 0000 16 khz 0010 32 khz 0100 50 khz 0110 65 khz 1000 80 khz 1010 95 khz 1100 110 khz 1 1 1 0 50 khz 0001 65 khz 0011 80 khz (default) 0 1 0 1 95 khz 0111 110 khz 1 0 0 1 130 khz 1 0 1 1 145 khz 1 1 0 1 160 khz 1 1 1 1 table 3-27. center frequency adjacent channel sensor center frequency bit 6 bit 5 450 khz 0 0 300 khz 0 1 700 khz 1 0 filter off 1 1 log intergrated fm band filter if lo g 4k 50k + pin 10 + -
18 4883a?audr?09/05 atr4255p 3.24 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 3-7. multipath sensor a multipath noise canceller (mnc) is implement ed 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 an adjustable threshold (adjustable by setting bits 81 to 84, table 3-30 on page 19 ), the mpx signal may be muted and this situation (mpint) can be signaled at pin 21 (int) as shown in table 3-25 on page 16 . muting of the mpx signal during multipath distur- bances can be activated be setting bit 8 ( table 3-29 ). table 3-28. output voltage of adjacent channel sensor for different receiving conditions and center frequencies adjacent channel disturbance 300 khz 450 khz 600 khz no high low high below high high low above low high high table 3-29. multipath noise canceller multipath noise canceller bit 8 active 0 not active 1 4k + pin 40
19 4883a?audr?09/05 atr4255p 3.25 3-wire b us description the register settings of atr4255p are programme d by a 3-wire bus protocol. the bus protocol consists of separate commands . a defined number of bits is transmitted sequentially during each command. one command is used to program all bits of one register. the different registers available (see table 3-31 on page 21 ) 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 th e enable line (en) and en ds 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 atr4255p are compatible to the addressing used in atr4256. that means atr4255p and atr4256 can be operated on the same 3-wire bus as shown in the application circuit. table 3-30. sensitivity of the mnc sensitivity mnc (threshold) bit 93 bit 92 bit 84 bit 83 bit 82 bit 81 off x10000 low x10001 ... x10010 (?18 db) x10011 ... x10100 ... x10101 ... x10110 normal (?12 db) x10111 ... x11000 ... x11001 ... x11010 ... x11011 ... x11100 ... x11101 ... x11110 high (?9 db) x11111
20 4883a?audr?09/05 atr4255p figure 3-8. pulse diagram figure 3-9. bus timing 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 t r enable data clock t r t s t r t s t hda t l t h t f t f t f t hen
21 4883a?audr?09/05 atr4255p 3.26 data transfer table 3-31. control registers 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 bwm px time window stop signal 100amfm 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 soft mute tk-fm if fm-agc am-agc fm bw 2 nd mixer if2 center frequency mp fs fm ext dem. adj. not used 101 x 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. used in test mode only center frequency of bandfilter bandwidth adj. channel sensor 111 xx 1 0000101 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. test mpoff mute adj. channel sensor 1000 b9 b8 b7 b6 b5 a8_101 msb byte 1 lsb addr. optimize bandwidth 101 b4 b3 b2 b1 b0
22 4883a?audr?09/05 atr4255p 4. 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 refer 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 5. thermal resistance parameters symbol value unit junction ambient, soldered to pcb r thja 60 k/w 6. operating range all voltages are referred to gnd (pin 25). parameters 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 7. 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 7.5 8.5 10 v c 1.2 supply current standby mode (bit 92 = 0, bit 93 = 0) 42 i stby 20 25 ma a 1.3 supply current other operation modes 42 i s 50 60 ma a 2vco 2.1 frequency range f vco 70 160 mhz d 2.2 dc bias voltage 13 2.8 3.0 3.2 v a 2.3 buffer output voltage f osc = 120 mhz 16 130 150 250 mvrms a 2.4 buffer output resistance 16 70 ? d 2.5 buffer output dc voltage 16 2.8 3.0 3.2 v a *) type means: a =100% tested, b = 100% correlation tested, c = characterized on samples, d = design parameter
23 4883a?audr?09/05 atr4255p 3fm rf-agc 3.1 saturation voltage no input signal 5 8.3 v a 3.2 saturation voltage no input signal 5 v s ? 0.2 v b 3.3 threshold level in-band signal 30 110 dbv d 3.4 maximum threshold level out-of-band signal (110 mhz), bit 64, 65 = 0 1 100 102 104 dbv a 4 am rf-agc, am mode (bit 92 = 0, bit 93 = 1) 4.1 saturation voltage no input signal 7 8.3 v a 4.2 saturation voltage no input signal 7 v s ? 0.2 v b 4.3 output voltage for minimum gain bit 92 = 1 7 6.5 6.8 7.1 v a 4.4 output voltage for minimum gain bit 92 = 1 7 v s ? 1.7 v b 4.5 maximum control voltage v(pin 8) = 3v 6 6.5 7.0 7.5 v a 4.6 maximum control voltage v(pin 8) = 3v 6 v s ? 1.5 v b 4.7 minimum control voltage v(pin 8) = 6v 6 0.2 0.7 v a 4.8 minimum threshold level bits 62, 63 = 0 41 97 99 101 dbv a 5 am mixer, am mode (bit 92 = 0, bit 93 = 1) 5.1 supply current sum of current in pins 43 and 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 14 db c 5.5 input bias dc voltage 3, 41 2.4 2.6 2.9 v a 5.6 input resistance single-ended, pin 39 ac grounded 3, 41 2.5 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 and 44 43, 44 15 17.5 20 ma a 6.2 conversion conductance 1, 2, 43, 44 7msd 7. 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
24 4883a?audr?09/05 atr4255p 6.3 3 rd -order intercept point 1, 2 ip3 fmmix 120 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 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 a 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 20 db c 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 14 16 ma a 9.2 am/wb supply current bit 92 = 0, bit 93 = 1 23, 24 8 10 12 ma d 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 7. 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 4883a?audr?09/05 atr4255p 9.11 lo input resistance 22 1 k ? d 9.12 lo input bias voltage 22 2.8 3.0 3.2 v a 10 2 nd if amplifier (bit 55 = 0) 10.1 input resistance pin 27 ac grounded 28 3 k ? d 10.2 maximum voltage gain am/wb mode (bit 93 = 1) 28, 20 44 47 50 db a 10.3 gain control range am/wb mode (bit 93 = 1) 44 db d 10.4 maximum voltage gain fm mode (bit 92 = 1, bit 93 = 0, bit 54 = 0) 23, 24 20 37 db d 10.5 dc output voltage 20 3.1 3.4 3.7 v a 10.6 ac output voltage unmodulated signal, 82 dbv at pin 1 (if agc active) 20 145 175 200 mvrms a 10.7 output impedance small signal 20 70 ? d 11 fm demodulator integrated bandfilter, 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 a 11.2 stereo roll-off deviation = 75 khz, f mod = 38 khz (reference: 1 khz) 11 ?2.3 ?2.0 ?1.7 db a 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 (snr) dev. = 22.5 khz, f mod = 1 khz, 50 s de- emphasize, signal input at 450 khz 11 (s/n) fm 62 65 db a 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 ?31 ?28 ?26 db a 12.2 mute gain bit 67 = 1, v (pin 34) = 2v 11 ?26 ?24 ?22 db a 12.3 soft mute threshold bits 89 to 91 = 0, bits 68 to 70 = 1 1505356dbvb 13 am demodulator, am mode (bit 92 = 0, bit 93 = 1) 13.1 ac output voltage modulation depth = 80%, f mod = 1 khz 11 350 400 450 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 (snr) modulation depth = 80%, f mod = 1 khz, 74 dbv at pin 41 11 (s/n) am 52 54 db a 7. 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 4883a?audr?09/05 atr4255p 14 mpx output 14.1 dc output voltage bit 7 = 1 11 2.15 2.25 2.4 v a 14.2 mute gain bit 7 = 1, fm dev. = 75 khz, f mod = 1 khz 11 ?70 ?50 db a 14.3 output resistance small signal 11 60 ? d 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 4.75 5.0 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 31 20 150 mv a 16.2 output voltage fm dev. = 75 khz, f mod = 1 khz 31 1.7 2.0 2.5 v a 17 field strength sensor, fm mode (bit 92 = 1, bit 93 = 0, bits 89 to 91 = 0, bit 80 = 0) 17.1 offset voltage no signal 9 0.4 0.75 1.1 v a 17.2 output voltage unmodulated signal 84 dbv at pin 1 92.73.03.3va field strength sensor, am mode (bit 92 = 0, bit 93 = 1, bit 80 = 1) 17.3 output voltage low field strength 63 dbv at pin 28 9 0.7 0.9 1.1 v a 17.4 output voltage high field strength 94 dbv at pin 28 9 2.3 2.5 2.7 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 20 200 mv a 18.2 output voltage am modulation depth = 60%, f mod = 20 khz, 60 dbv at pin 1 40 1.4 1.8 2.2 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 10 100 300 mv a 19.2 output voltage fm dev. = 50 khz, f mod = 1 khz 10 0.6 1.0 v a 19.3 output voltage desired fm dev. = 75 khz, f mod = 1 khz undesired: unmodulated rf level undesired/desired: +30 db frequency offset = ?150 khz 10 1.0 1.2 1.6 v a 7. 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 4883a?audr?09/05 atr4255p 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 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 7. 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 4883a?audr?09/05 atr4255p 8. diagrams the following data was measured with the application board ( figure 8-9 on page 32 ). 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 8-1. fm demodulator note: integrated bandfilter bw setting: 120 khz, bits 0 to 2 = 0, bit 3 = 1; 1 khz modulation frequency; 50 s de-emphasis (thd). figure 8-2. multipath sensor note: am modulation frequency 20 khz; generator level 40 dbv. 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 10203040 5060 7080 90100 frequency deviation (khz) mpx output voltage (vrms) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 thd ( % ) mpx thd +85?c -40?c +85?c -40?c 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 020406080100 am modulation depth (%) sensor output voltage (v) -40?c +25?c +85?c
29 4883a?audr?09/05 atr4255p figure 8-3. multipath sensor frequency response note: generator level 40 dbv. figure 8-4. deviation sensor note: fm modulation frequency: 1 khz; bw setting 2 nd if filter = 120 khz. figure 8-5. deviation sensor frequency response note: fm frequency deviation: 22.5 khz. 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 100 1000 10000 10000 0 am modulation frequency (hz) sensor output voltage (v) 90% at +85?c 90% at +25?c 90% at -40?c 60% at +85?c 60% at +25?c 60% at -40?c 0 1 2 3 4 5 0 20000 40000 60000 80000 100000 fre q uenc y deviation ( hz ) deviation sensor output voltage (v) +85?c -40?c 0.0 0.5 1.0 100 1000 10000 100000 fm modulation frequency (hz) sensor output voltage (v)
30 4883a?audr?09/05 atr4255p figure 8-6. fm input level sweep note: soft mute threshold, bits 68 and 69 = 0, bit 70 = 1; soft mute gain, bit 67 = 1, gain fm if amplifier, bit 89 = 1, bits 90 and 91 = 0. figure 8-7. selectivity note: integrated bandfilter bw setting: 120 khz desired signal level adjusted to 40 db snr without undesired signal, undesired signal level adjusted to 26 db snr. -70 -60 -50 -40 -30 -20 -10 0 10 -20 0 20 40 60 80 100 120 in p ut level ( db v ) mpx output (db) 1 1.5 2 2.5 3 3.5 4 4.5 5 field strength sensor out p ut volta g e ( v ) signal sensor output noise -70 -60 -50 -40 -30 -20 -10 0 10 20 -250 -200 -150 -100 -50 0 50 100 150 200 250 frequency offset (khz) pdes/pundes (db) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 adjacent channel output voltage (v) pdes/pundes adjacent
31 4883a?audr?09/05 atr4255p figure 8-8. test circuit 330 1k 600 4n7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 24 23 26 25 28 27 30 29 32 31 34 33 36 35 38 37 40 39 42 41 44 43 vs 100n 10n 10n 100n bus 10n 10k vs 82p vs vs 100n p41 10n 100n 100n 100n 220n 47p 22p 6p8 5k6 1n 10k 100 10 15p 100p 270 2k2 100n p29 200k p29 p31 22n 2k2 10k 2n2 p41 10n 10k v 220n p29 atr4256 pin1 pin19 pin15 test point atr4255p
32 4883a?audr?09/05 atr4255p figure 8-9. application circuit 12 13 atr4255p 14 15 16 17 18 19 20 21 22 33 32 31 30 29 28 27 26 25 24 23 44 43 42 41 40 39 38 37 36 35 34 1 2 3 4 5 6 7 8 9 10 11 18p c203 22 c131 c132 f131 bb804 1 2 3 4 5 6 7 8 9 10 atr4256 20 19 18 17 16 15 14 13 12 11 c314 10n f102 c112 10 c113 100n swo1 dac3 swo2 swo3 swo4 int if2out data clk en gnd mpx adjac meter c310 f302 multip dev c208 c205 c202 f201 q151 r407 10 r106 10 r152 10 c312 10n 1n c309 r303 1k 220n c207 r305 1k5 x301 r304 1k3 r34 27 kr201 r313 390 c111 470n c in f201 100p c307 10n c209 r29 10 c308 100n vs (+8.5v to 10.5v) r311 2k2 r105 100 r115 1k t102 bc858 c109 c108 r102 68k c110 4n7 r121 68k r122 68k c56 10p c104 10n r112 47k l102 r104 470 c117 c107 22 c106 27p f101 bb804 d101 c103 c102 10n c311 100n r103 1k 3p9 d103 s391d 10n d302 l301 47 l303 2m2 l302 100 h c306 c319 12p 6p8 bc 858c c316 r308 2k2 220n r307 47 c315 220n c302 10n r306 470k r151 8k2 c152 330p c134 1n c151 10n c158 10n c159 c157 10n 10n c154 c153 c155 c156 10n 10.25 mhz 12p* 12p* 100n c114 220n c133 6p8 47p 22p r131 5k6 kf302 kr202 220n 220n c204 c206 r111 200k 1 10n 10 470n c116 c115 100n 100n 10n t301 t302 bc848 t111 j109 t101 bfr93a ant fm 75 ? s391d d301 s391d c201 100n d131 d102 bb804 1n 6p8 *depends on q151
33 4883a?audr?09/05 atr4255p 10. package information 9. ordering information extended type number package remarks ATR4255P-ILSH sso44 tube, lead-free atr4255p-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
printed on recycled paper. 4883a?audr?09/05 ? atmel corporation 2005 . all rights reserved. atmel ? , logo and combinations thereof, everywhere you are ? and others, are registered trade- marks or trademarks of atmel corporation or its subsidiari es. other terms and product names may be trademarks of others. disclaimer: the information in this document is provided in connection with atmel products. no license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of atmel products. except as set forth in atmel?s terms and condi- tions of sale located on atmel? s web site, atmel assumes no liability whatsoever and disclaims any express, implied or statutor y warranty relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a particu lar purpose, or non-infringement. in no event shall atmel be liable for any direct, indirect, conseque ntial, punitive, special or i nciden- tal damages (including, without limitation, damages for loss of profits, business interruption, or loss of information) arising out of the use or inability to use this document, even if at mel has been advised of the possibility of such damages. atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the ri ght to make changes to specifications and product descriptions at any time without notice. atmel does not make any commitment to update the information contained her ein. unless specifically provided otherwise, atmel products are not suitable for, and shall not be used in, automotive applications. atmel?s products are not int ended, authorized, or warranted for use as components in applications intended to support or sustain life. atmel corporation atmel operations 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 487-2600 regional headquarters europe atmel sarl route des arsenaux 41 case postale 80 ch-1705 fribourg switzerland tel: (41) 26-426-5555 fax: (41) 26-426-5500 asia room 1219 chinachem golden plaza 77 mody road tsimshatsui east kowloon hong kong tel: (852) 2721-9778 fax: (852) 2722-1369 japan 9f, tonetsu shinkawa bldg. 1-24-8 shinkawa chuo-ku, tokyo 104-0033 japan tel: (81) 3-3523-3551 fax: (81) 3-3523-7581 memory 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 436-4314 microcontrollers 2325 orchard parkway san jose, ca 95131, usa tel: 1(408) 441-0311 fax: 1(408) 436-4314 la chantrerie bp 70602 44306 nantes cedex 3, france tel: (33) 2-40-18-18-18 fax: (33) 2-40-18-19-60 asic/assp/smart cards zone industrielle 13106 rousset cedex, france tel: (33) 4-42-53-60-00 fax: (33) 4-42-53-60-01 1150 east cheyenne mtn. blvd. colorado springs, co 80906, usa tel: 1(719) 576-3300 fax: 1(719) 540-1759 scottish enterprise technology park maxwell building east kilbride g75 0qr, scotland tel: (44) 1355-803-000 fax: (44) 1355-242-743 rf/automotive theresienstrasse 2 postfach 3535 74025 heilbronn, germany tel: (49) 71-31-67-0 fax: (49) 71-31-67-2340 1150 east cheyenne mtn. blvd. colorado springs, co 80906, usa tel: 1(719) 576-3300 fax: 1(719) 540-1759 biometrics/imaging/hi-rel mpu/ high speed converters/rf datacom avenue de rochepleine bp 123 38521 saint-egreve cedex, france tel: (33) 4-76-58-30-00 fax: (33) 4-76-58-34-80 literature requests www.atmel.com/literature

▲Up To Search▲

Price & Availability of ATR4255P-ILSH

	To Download ATR4255P-ILSH Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .