Features • • • • • • • • • • • FM Double-conversion System Integrated Second IF Filter with Software-controlled Bandwidth Completely Integrated FM Demodulator Soft Mute and Multipath Noise Cancellation Receiving Condition Analyzer AM Up/Down-conversion System AM Preamplifier with AGC and Stereo Capability 3-wire Bus Controlled Search Stop Signal Generation for AM and FM Automatic Alignment Possible Lead-free Package AM/FM Receiver IC ATR4255P 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. Rev. 4883B–AUDR–01/06 Figure 1-1. Block Diagram MX1OA IF1FMI MX2OB IF1AMI V3 IF2IN MX1OB IF1REF IF1OUT MX2IN MX2OA AMPLPF 8 7 AMAGC 6 AMVREG 43 44 38 39 33 30 29 26 23 24 28 V3P IF2OUT 27 20 AM AGC FM AM dem. MX1AMA MX1AMB 41 32 3 V3 AGC 36 GNDMX MX1FMB MX1FMA OSCOUT OPLPF AM 35 4 2 FM Automatic adjustment AGC 1 16 37 IFAGCL IFAGCH FILADJ Multipath Divider 11 GNDOSC OSCE OSCB Adjacent channel 15 14 Stop Soft mute MPX OSC 13 V3 Band gap Bus 17 18 19 5 12 25 42 Dev. analog INT 9 EN DATA FMAGC METER GND CLK V57 VS 2 FM dem. 22 MX2LO 10 ADJAC 21 INT 40 MULTIP 34 31 SMUTE DEV ATR4255P 4883B–AUDR–01/06 ATR4255P 2. Pin Configuration Figure 2-1. Pinning SSO44 MX1FMA 1 44 MX1OB MX1FMB 2 43 MX1OA MX1AMB 3 42 VS GNDMX 4 41 MX1AMA FMAGC 5 40 MULTIP AMVREG 6 39 IF1REF AMAGC 7 38 IF1FMI AMPLPF 8 37 FILADJ METER 9 36 IFAGCL ADJAC 10 35 IFAGCH MPX 11 34 SMUTE V57 12 33 IF1AMI OSCB 13 32 OPLPF OSCE 14 31 DEV GNDOSC 15 30 IF1OUT OSCOUT 16 29 V3 EN 17 28 IF2IN CLK 18 27 V3P DATA 19 26 MX2IN IF2OUT 20 25 GND 21 24 MX2OA MX2LO 22 23 MX2OB INT 3 4883B–AUDR–01/06 Table 2-1. 4 Pin Description Pin Symbol Function 1 2 3 4 5 MX1FMA MX1FMB MX1AMB GNDMX FMAGC 1st mixer FM input A 1st mixer FM input B 1st mixer AM input B Ground 1st mixer, preamplifier AGC FM preamplifier AGC 6 7 8 9 10 AMVREG AMAGC AMPLPF METER ADJAC AM control voltage AM preamplifier AGC AM AGC LP filter Field strength output Adjacent channel detection output 11 12 13 14 MPX V57 OSCB OSCE 15 16 GNDOSC OSCOUT Oscillator ground Oscillator output 17 18 EN CLK 3-wire bus enable 3-wire bus clock 19 20 DATA IF2OUT 3-wire bus data 2nd IF amplifier output 21 22 INT MX2LO Interrupt, stop signal 10.25 MHz input for 2nd mixer 23 24 25 MX2OB MX2OA GND 2nd mixer output B 2nd mixer output A Ground 26 27 28 29 30 31 32 33 34 35 MX2IN V3P IF2IN V3 IF1OUT DEV OPLPF IF1AMI SMUTE IFAGCH 2nd mixer input 3V reference for AMPIN, AMIFAGC, Control, IF2IN 2nd IF amplifier input 3V reference for IF1OUT, MX2IN 1st IF amplifier output Deviation detect output, test output Operating point LPF 1st IF AM amplifier input Soft mute control input IF AGC LP filter high time 36 37 38 IFAGCL FILADJ IF1FMI IF AGC LP filter low time constant Filter adjust 1st IF FM amplifier input 39 40 41 42 43 IF1REF MULTIP MX1AMA VS MX1OA 44 MX1OB Multiplex signal 5.7V reference voltage Oscillator basis Oscillator emitter 1st IF and MX1OUT reference, MX1AMA, MX1AMB Multipath detection output 1st mixer AM input A Supply voltage 1st mixer output A 1st mixer output B ATR4255P 4883B–AUDR–01/06 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-conversion 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 1st 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 feature, 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 circuit 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 1st IF AM amplifier at pin 33 are activated. The input of the 2nd IF amplifier is connected to pin 28 and the output of the 2nd 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 1st 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 2nd IF amplifier can be switched between pins 23, 24 and 28. The output of the 2nd 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 2nd 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 5 4883B–AUDR–01/06 3.2 Test Mode A special test mode is implemented for final production test only. This mode is activated by setting 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. Table 3-2. 3.3 Test Mode Mode Bit 9 Normal operation 0 Test mode 1 VCO An oscillator circuit is implemented to build a VCO as proposed in the application schematic. The VCO frequency is used to generate the LO frequency of the 1st mixer stages. The control voltage of the VCO is usually generated by the PLL circuit 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 changing 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 VS Pin 42 C111 R115 Pin 5 PIN Diode AGC 6 B92 ATR4255P 4883B–AUDR–01/06 ATR4255P Table 3-3. 3.5 FM-AGC Threshold FM-AGC Threshold Bit 65 Bit 64 104 dBµV 0 0 101 dBµV 0 1 98 dBµV 1 0 92 dBµV 1 1 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 constant of the AGC control loop can be adjusted by changing the value of the capacitor at pin 8. Table 3-4. 3.6 AM-AGC Threshold AM-AGC Threshold Bit 63 Bit 62 99 dBµV 0 0 102 dBµV 0 1 104 dBµV 1 0 105 dBµV 1 1 FM 1st Mixer In the 1st FM mixer stage, the FM reception frequency is down converted to the 1st IF frequency. The VCO frequency is used as LO frequency for the mixer. 3.7 AM 1st Mixer The AM 1st mixer is used for up-conversion of the AM reception frequency to the 1 st IF frequency. 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 3-5. 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 1 0 x 0 0 1 Divide by 7 1 0 x 0 1 0 Divide by 8 1 0 x 1 0 0 Divide by 4 1 0 x 1 0 1 7 4883B–AUDR–01/06 3.8 FM 1st IF Amplifier A programmable gain amplifier is used in FM and WB mode between pin 38 and pin 30 to compensate the loss in the external ceramic band filters. The gain of this amplifier is adjusted by bits 89 to 91 (Table 3-6). The input and the output resistance is 330Ω, 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). Table 3-6. Table 3-7. 3.9 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 Temperature Coefficient Setting of FM IF Amplifier Temperature Coefficient (TC) of the IF Amplifier Bit 66 TKmin 0 TKmax 1 AM 1st IF Amplifier In AM mode, the gain of the 1st IF amplifier is controlled by the IF-AGC to extend the control range of the IF-AGC. 3.10 2nd Mixer The 2nd mixer is used in AM, FM and WB mode. The mixer input has 330Ω 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 bandwidth of the tank at the mixer output. The output resistance can be selected by bits 60 and 61 (Table 3-8). Table 3-8. 2nd Mixer Output Resistance in FM Mode Bit 61 Bit 60 Output Resistance (Bit 54 = 0) Output Resistance (Bit 54 = 1) 0 0 3.3 kΩ ~100 kΩ 0 1 0.63 kΩ 0.78 kΩ 1 0 0.47 kΩ 0.55 kΩ 1 1 0.29 kΩ 0.32 kΩ The LO frequency of the 2nd mixer (10.25 MHz) has to be applied at pin 22. This signal is usually generated by the PLL circuit ATR4256. 8 ATR4255P 4883B–AUDR–01/06 ATR4255P Table 3-9. Bit 61 Bit 60 FM BW Mixer 2 0 0 150 kHz 0 1 200 kHz 1 0 250 kHz 1 Note: 3.11 FM Bandwidth (BW) Mixer 2 1 450 kHz The bandwidth also depends on the values of the application circuit. 2nd IF Amplifier In AM and WB mode, the input of the second IF amplifier is pin 28, which is externally connected to the 2nd 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 2nd mixer output (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 2nd mixer tank and pin 28 in FM mode by setting bit 54 to “1”. Table 3-10. 3.12 2nd IF Filter in FM Mode 2nd IF Filter Bit 54 Internal filter 0 External and internal filter 1 IF-AGC The IF-AGC controls the level of the 2nd IF signal that is passed to the AM demodulator input or the integrated FM bandfilter, and to the 2nd 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. 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) In FM/WB mode, the output signal of the FM demodulator is applied to pin 35 via a series resistor of about 95 kΩ. 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. 9 4883B–AUDR–01/06 3.13 2nd IF Output The 2nd IF after the gain-controlled 2nd 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 integrated FM band filter, which is used for multipath detection, can be switched to pin 20 by setting bit 55 to “1”. Table 3-12. 3.14 Pin 20 Output Setting Pin 20 Bit 55 2nd IF output 0 Multipath field strength 1 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 frequency 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 Pin 22 10.25 MHz Automatic frequency adjustment + Bit 56 to 59 Pin 37 Center freq. FM demod. Center freq. FM band filter Bit 14 to 17 + Center freq. Adj. channel sensor Bits 5 and 6 For fine tuning, the center frequency of all these integrated active filters (band filter, demodulator, 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. 10 ATR4255P 4883B–AUDR–01/06 ATR4255P 1 Table 3-13. 2nd 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 11 4883B–AUDR–01/06 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 2nd 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 bandwidth of the integrated filter is shifted to lower 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. Table 3-15. 3.16 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 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 center 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”. 12 ATR4255P 4883B–AUDR–01/06 ATR4255P Figure 3-3. FM Demodulator Automatic Fine Tuning FM demod. Center freq. MPX AM AGC B92 + IFAGCH V3 (10 nF) Bit 53 Automatic frequency adjustment 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 active (bit 7 = 1). This adjustment will affect the center frequency of all integrated filters as mentioned before. Table 3-16. Demodulator Gain in Weather Band Mode 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. 3.17 Demodulator Gain in Weather Band Mode Demodulator Fine Adjustment Demodulator Fine Adjustment Bit 53 Fine tuning ON 0 Fine tuning OFF 1 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 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 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 threshold referred to the input of the FM mixer depends on the gain from FM mixer input to the field strength sensor. 13 4883B–AUDR–01/06 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 Table 3-19. –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 Maximum Soft Mute Maximum Value of Soft Mute Bit 67 28 dB 0 24 dB 1 Figure 3-4. Soft Mute + FS (Pin 9) Bit 67 Pin 34 Gain FM demodulator Bits 68 to 70 Pin 29 3.18 V3 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 3-20. 14 MPX Output Mute MPX Output Bit 7 MPX out, pin 11 normal operation 0 Mute ON 1 ATR4255P 4883B–AUDR–01/06 ATR4255P Table 3-21. 3.19 MPX Output Bandwidth Bandwidth MPX Low-pass Filter Bit 79 90 kHz 0 180 kHz 1 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 2nd 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 additional selectivity between the 2nd mixer and the 2nd 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. Table 3-22. 3.21 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 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 during 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 3-23. 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 0 0 0 0 0 1 ... ... ... ... ... ... ... 63 × 3.1969 ms 1 1 1 1 1 1 15 4883B–AUDR–01/06 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 1 0 0 ±20 kHz 1 0 1 ±40 kHz 1 1 0 ±80 kHz 1 1 1 Table 3-25. Signals Available at Digital Output Pin 21 Bit 88 3.22 Bit 92 INT (Pin 21) 0 0 (AM) 1 0 1 (FM/WB) NOT MPINT 1 0 (AM) NOT STOP 1 1 (FM/WB) NOT (STOP AND NOT MPINT) Deviation Sensor The deviation sensor is active in AM and FM/WB mode and measures the modulation of the signal. 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 + MPX 4k Pin 31 25k 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 frequency of the band filter of the adjacent channel sensor below or above the 2nd IF frequency (bits 5 and 6), it can be determined whether the disturbance 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 adjacent 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. 16 ATR4255P 4883B–AUDR–01/06 ATR4255P Figure 3-6. Adjacent Channel Sensor IF Intergrated FM band filter + log + 4k Pin 10 50k log Table 3-26. Table 3-27. Bandwidth (BW) of the Adjacent Channel Detector Filter BW Adjustment Bit 13 Bit 12 Bit 11 Bit 10 3 kHz 0 0 0 0 16 kHz 0 0 1 0 32 kHz 0 1 0 0 50 kHz 0 1 1 0 65 kHz 1 0 0 0 80 kHz 1 0 1 0 95 kHz 1 1 0 0 110 kHz 1 1 1 0 50 kHz 0 0 0 1 65 kHz 0 0 1 1 80 kHz (default) 0 1 0 1 95 kHz 0 1 1 1 110 kHz 1 0 0 1 130 kHz 1 0 1 1 145 kHz 1 1 0 1 160 kHz 1 1 1 1 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 17 4883B–AUDR–01/06 Table 3-28. 3.24 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 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 + Pin 40 4k A multipath noise canceller (MNC) is implemented to reduce disturbance of the received signal in multipath reception conditions. If the difference 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 disturbances can be activated be setting bit 8 (Table 3-29). Table 3-29. 18 Multipath Noise Canceller Multipath Noise Canceller Bit 8 Active 0 Not active 1 ATR4255P 4883B–AUDR–01/06 ATR4255P Table 3-30. 3.25 Sensitivity of the MNC Sensitivity MNC (Threshold) Bit 93 Bit 92 Bit 84 Bit 83 Bit 82 Bit 81 Off x 1 0 0 0 0 Low x 1 0 0 0 1 ... x 1 0 0 1 0 (–18 dB) x 1 0 0 1 1 ... x 1 0 1 0 0 ... x 1 0 1 0 1 ... x 1 0 1 1 0 Normal (–12 dB) x 1 0 1 1 1 ... x 1 1 0 0 0 ... x 1 1 0 0 1 ... x 1 1 0 1 0 ... x 1 1 0 1 1 ... x 1 1 1 0 0 ... x 1 1 1 0 1 ... x 1 1 1 1 0 High (–9 dB) x 1 1 1 1 1 3-wire Bus Description The register settings of ATR4255P are programmed 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 for 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 line (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 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. 19 4883B–AUDR–01/06 Figure 3-8. Pulse Diagram 8-bit command EN DATA LSB BYTE 1 MSB BYTE 1 MSB LSB CLK 24-bit command EN DATA LSB BYTE 2 MSB LSB BYTE 3 MSB CLK Figure 3-9. Bus Timing tR tF Enable tS tHEN tF tR Data tHDA tS tR tF Clock tH tL 20 ATR4255P 4883B–AUDR–01/06 ATR4255P 3.26 Data Transfer Table 3-31. Control Registers A24_100 MSB BYTE 3 ADDR. 1 0 LSB AM/FM/ WB 0 AM FM B93 B92 MSB B91 B90 BYTE 2 LSB MSB BYTE 1 OSC divider/multipath Field BWM Search Width of window sensitivity strength PX Gain FM IF amplifier B89 B88 LSB MSB B87 B86 B85 B84 B83 B82 B81 B80 B79 LSB Time window stop signal B78 B77 B76 B75 B74 B73 A24_101 MSB BYTE 3 WBDemodGain ADDR. 1 0 Soft mute Start soft mute BYTE 2 Tk-FM FM-AGC IF LSB MSB AM-AGC FM BW 2nd mixer BYTE 1 MP FS IF2 center frequency LSB FM ext Dem. Not Adj. used 1 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 ADDR. 1 1 BYTE 2 LSB MSB Center frequency of bandfilter Used in test mode only 1 B30 B29 B28 B27 B26 B25 B24 BYTE 1 x x B23 B22 B21 B20 B19 B18 1 0 B17 B16 0 0 LSB Bandwidth adj. channel sensor 0 B15 B14 B13 1 0 1 B12 B11 B10 A8_100 MSB BYTE 1 ADDR. 1 0 LSB Test MPoff Mute 0 Adj. channel sensor 0 B9 B8 B7 B6 B5 A8_101 MSB BYTE 1 ADDR. 1 0 Optimize LSB Bandwidth 1 B4 B3 B2 B1 B0 21 4883B–AUDR–01/06 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 those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. All voltages refer to GND (pin 25). Parameters Symbol Value Unit Supply voltage, pin 42 VS 10 V Power dissipation Ptot 1000 mW Tj 150 °C Ambient temperature range Tamb –40 to +85 °C Storage temperature range Tstg –50 to +150 °C Symbol Value Unit RthJA 60 K/W Junction temperature 5. Thermal Resistance Parameters Junction ambient, soldered to PCB 6. Operating Range All voltages are referred to GND (pin 25). Parameters Symbol Supply voltage range, pin 42 Ambient temperature Min. Typ. VS 7.5 8.5 Tamb –40 Max. Unit 10 V +85 °C 7. Electrical Characteristics Test conditions (unless otherwise specified): VS = 8.5V, Tamb = 25°C. No. Parameters 1 Power Supply 1.1 Supply voltage Test Conditions 1.2 Supply current Standby mode (bit 92 = 0, bit 93 = 0) 1.3 Supply current Other operation modes 2 Pin Symbol Min. Typ. Max. Unit Type* 7.5 8.5 10 V C 42 VS 42 IStby 20 25 mA A 42 IS 50 60 mA A 160 MHz D VCO 2.1 Frequency range fVCO 2.2 DC bias voltage 2.3 Buffer output voltage 2.4 Buffer output resistance 16 2.5 Buffer output DC voltage 16 fosc = 120 MHz 70 13 2.8 3.0 3.2 V A 16 130 150 250 mVrms A Ω D V A 70 2.8 3.0 3.2 *) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter 22 ATR4255P 4883B–AUDR–01/06 ATR4255P 7. Electrical Characteristics (Continued) Test conditions (unless otherwise specified): VS = 8.5V, Tamb = 25°C. No. Parameters 3 FM RF-AGC Test Conditions Pin Symbol Min. Typ. Max. Unit Type* 3.1 Saturation voltage No input signal 5 8.3 V A 3.2 Saturation voltage No input signal 5 VS – 0.2 V B 3.3 Threshold level In-band signal 30 dBµV D 3.4 Maximum threshold level Out-of-band signal (110 MHz), bit 64, 65 = 0 1 100 dBµV A 4 110 102 104 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 VS – 0.2 V B 4.3 Output voltage for minimum gain Bit 92 = 1 7 6.5 V A 4.4 Output voltage for minimum gain Bit 92 = 1 7 V B 4.5 Maximum control voltage V(pin 8) = 3V 6 V A 4.6 Maximum control voltage V(pin 8) = 3V 6 VS – 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 dBµV A 43, 44 14 16 20 mA A 4.1 mS D 5 7.1 VS – 1.7 6.5 7.0 7.5 AM Mixer, AM Mode (Bit 92 = 0, Bit 93 = 1) Sum of current in pins 43 and 44 5.1 Supply current 5.2 Conversion conductance 5.3 3rd-order input intercept Pin 3 AC grounded point 5.4 Noise figure (SSB) 5.5 Input bias DC voltage 5.6 Input resistance 5.7 Input capacitance 5.8 Maximum output voltage 5.9 Output resistance 6 6.8 3, 41, 43, 44 Generator resistance 2.5 kΩ (pin 41) 41 IP3AMmix 132 dBµV C 43, 44 NFAMmix 14 dB C V A kΩ D pF D 3, 41 Single-ended, pin 39 AC grounded 2.4 3, 41 2.6 2.5 3, 41 Differential 2.9 3 43, 44 12 Vpp D 43, 44 100 kΩ D 43, 44 15 mA A mS D FM Mixer (FM Mode (Bit 92 = 1, Bit 93 = 0) 6.1 Supply current 6.2 Conversion conductance Sum of current in pins 43 and 44 1, 2, 43, 44 17.5 20 7 *) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter 23 4883B–AUDR–01/06 7. Electrical Characteristics (Continued) Test conditions (unless otherwise specified): VS = 8.5V, Tamb = 25°C. No. Parameters Test Conditions rd 6.3 3 -order intercept point 6.4 Noise figure (DSB) 6.5 Input resistance 6.6 Input capacitance Pin 2 AC grounded 6.7 Maximum differential output voltage VS = 8.5V 6.8 Output resistance 7 Generator resistance 200Ω Pin Symbol 1, 2 IP3FMmix 43, 44 NFFMmix Min. Typ. Max. Unit Type* 120 dBµV C 10 dB C 1, 2 1.6 kΩ D 1 5 pF D 43, 44 12 Vpp D 43, 44 100 kΩ D dB A st 1 IF FM Amplifier, FM Mode (Bit 92 = 1, Bit 93 = 0) 7.1 Minimum voltage gain 7.2 Temperature coefficient Bit 66 = 0 of gain TKmin 0.039 dB/K D 7.3 Temperature coefficient Bit 66 = 1 of gain TKmax 0.044 dB/K D 7.4 Input resistance Pin 39 AC grounded 38 Ω D 7.5 Input capacitance Pin 39 AC grounded 38 pF D 7.6 Output resistance Ω D 16 dB D 26 dB D 20 dB C kΩ D pF D 8 38, 30 19 270 21 330 23 400 5 30 270 330 400 st 1 IF AM Amplifier, AM Mode (Bit 92 = 0, Bit 93 = 1) 8.1 Maximum voltage gain 8.2 Gain control range 8.3 Noise figure 8.4 Input resistance 8.5 Input capacitance 8.6 Output resistance 9 Bits 89, 90, 91 = 0 nd 2 330Ω load at pin 30 30, 33 Generator resistance 2.5 kΩ NFIFAM 33 Pin 39 AC grounded 10 33 1 30 270 330 400 Ω D 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 2 mS D 9.4 Noise figure (SSB) 9.5 3rd-order input intercept point 9.6 AM/WB output resistance Bit 92 = 0, bit 93 = 1 23, 24 9.7 Maximum differential output voltage AM/WB VS = 8.5V 9.8 Maximum differential output voltage FM 9.9 9.10 26, 23, 24 Generator resistance 330Ω (pin 26) 23, 24 NFMix2 23 dB C 26 IP3Mix2 132 dBµV C 100 kΩ D 23, 24 12 Vpp D 23, 24 1 Vpp D Input resistance 26 270 400 Ω D LO input voltage 22 80 500 mVpp D 330 *) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter 24 ATR4255P 4883B–AUDR–01/06 ATR4255P 7. Electrical Characteristics (Continued) Test conditions (unless otherwise specified): VS = 8.5V, Tamb = 25°C. No. Parameters 9.11 LO input resistance 22 9.12 LO input bias voltage 22 10 Test Conditions Pin Symbol Min. Typ. Max. 1 2.8 3.0 3.2 Unit Type* kΩ D V A kΩ D dB A 2nd IF Amplifier (Bit 55 = 0) 10.1 Input resistance Pin 27 AC grounded 10.2 Maximum voltage gain AM/WB mode (bit 93 = 1) 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 23, 24 20 93 = 0, bit 54 = 0) 37 dB D 10.5 DC output voltage 10.6 AC output voltage 10.7 Output impedance 11 28 3 28, 20 44 47 50 20 3.1 3.4 3.7 V A Unmodulated signal, 82 dBµV at pin 1 (IF AGC active) 20 145 175 200 mVrms A Small signal 20 Ω D 70 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, fmod = 1 kHz 11 420 480 540 mVrms A 11.2 Stereo roll-off Deviation = ±75 kHz, fmod = 38 kHz (reference: 1 kHz) 11 –2.3 –2.0 –1.7 dB A 11.3 Total harmonic distortion Deviation = ±75 kHz, fmod = 1 kHz 11 THDFM 0.4 0.7 % A 11.4 Maximum signal-to-noise ratio (SNR) Dev. = ±22.5 kHz, fmod = 1 kHz, 50 µs deemphasize, signal input at 450 kHz 11 (S/N)FM dB A 12 62 65 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 1 50 53 56 dBµV B 350 400 450 mVrms A 0.6 2 % A dB A 13 AM Demodulator, AM Mode (Bit 92 = 0, Bit 93 = 1) 13.1 AC output voltage Modulation depth = 80%, fmod = 1 kHz 11 13.2 Total harmonic distortion Modulation depth = 80%, fmod = 1 kHz, V(pin 35) = const. 11 THDAM 13.3 Maximum signal-to-noise ratio (SNR) Modulation depth = 80%, fmod = 1 kHz, 74 dBµV at pin 41 11 (S/N)AM 52 54 *) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter 25 4883B–AUDR–01/06 7. Electrical Characteristics (Continued) Test conditions (unless otherwise specified): VS = 8.5V, Tamb = 25°C. No. Parameters Test Conditions Pin 14 MPX Output DC output voltage Bit 7 = 1 11 14.2 Mute gain Bit 7 = 1, FM dev. = ±75 kHz, fmod = 1 kHz 14.3 Output resistance Small signal 14.1 15 Symbol Min. Typ. Max. Unit Type* 2.15 2.25 2.4 V A 11 –70 –50 dB A 11 60 Ω D V A kΩ D Search Stop Detector, INT Output 15.1 LOW saturation voltage 21 0 15.2 LOW output resistance 21 0.3 15.3 HIGH saturation voltage 21 15.4 HIGH output resistance 21 1 20 2.0 16 4.75 5.0 V A kΩ D 150 mV A 2.5 V A Deviation Sensor, FM Mode (Bit 92 = 1, Bit 93 = 0) 16.1 Offset voltage FM dev. = ±0 kHz 31 16.2 Output voltage FM dev. = ±75 kHz, fmod = 1 kHz 31 17 4.5 0.5 1.7 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 dBµV at pin 1 9 2.7 3.0 3.3 V A Field Strength Sensor, AM Mode (Bit 92 = 0, Bit 93 = 1, Bit 80 = 1) 17.3 Output voltage LOW field strength 63 dBµV at pin 28 9 0.7 0.9 1.1 V A 17.4 Output voltage HIGH field strength 94 dBµV at pin 28 9 2.3 2.5 2.7 V A 20 200 mV A 1.8 2.2 V A 18 18.1 18.2 19 Multipath Sensor, FM Mode (Bit 92 = 1, Bit 93 = 0) Offset voltage Unmodulated signal, 60 dBµV at pin 1 40 Output voltage AM modulation depth = 60%, fmod = 20 kHz, 60 dBµV at pin 1 40 1.4 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, fmod = 1 kHz 10 0.6 1.0 V A Output voltage Desired FM dev. = ±75 kHz, fmod = 1 kHz Undesired: unmodulated RF level Undesired/desired: +30 dB frequency offset = –150 kHz 10 1.2 1.6 V A 19.3 20 1.0 3-wire Bus *) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter 26 ATR4255P 4883B–AUDR–01/06 ATR4255P 7. Electrical Characteristics (Continued) Test conditions (unless otherwise specified): VS = 8.5V, Tamb = 25°C. No. Parameters 20.1 Input voltage LOW 17, 18, 19 20.2 Input voltage HIGH 17, 18, 19 20.3 Leakage current 20.4 Clock frequency 20.5 Period of CLK HIGH LOW tH tL 20.6 Rise time EN, DATA, CLK tr 20.7 Fall time EN, DATA, CLK tf 20.8 Set-up time ts 20.9 Hold time EN 20.10 Hold time DATA 21 Test Conditions V = 0V, 5V Pin Symbol Min. Typ. Max. Unit Type* 0.8 V D V D 2.7 17, 18, 19 10 µA D 18 1.0 MHz D ns ns D 400 ns D 100 ns D 100 ns D tHEN 250 ns D tHDA 0 ns D V A 250 250 Internally Generated Reference Voltages 21.1 Output voltage 12 5.5 5.7 6.0 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 *) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter 27 4883B–AUDR–01/06 8. Diagrams The following data was measured with the application board (Figure 8-9 on page 32). In the measurement setup, a 50Ω generator is terminated by 50Ω and connected to the antenna input by a 50Ω series resistor to achieve 75Ω termination at the antenna input. The generator level specified is the output voltage of this 50Ω generator at 50Ω load. If the application board is replaced by a 75Ω resistor, the voltage at this resistor is 6 dB below the specified voltage level of the 50Ω generator. FM Demodulator 1.0 1 0.9 0.9 0.8 0.8 +85˚C 0.7 0.7 0.6 0.6 -40˚C 0.5 0.5 MPX 0.4 0.4 THD 0.3 THD (%) MPX Output Voltage (Vrms) Figure 8-1. 0.3 -40˚C 0.2 0.2 +85˚C 0.1 0.1 0.0 0 10 20 30 40 50 60 70 80 90 0 100 Frequency Deviation (kHz) Note: Integrated bandfilter BW setting: 120 kHz, bits 0 to 2 = 0, bit 3 = 1; 1 kHz modulation frequency; 50 µs de-emphasis (THD). Figure 8-2. Multipath Sensor 5.0 Sensor Output Voltage (V) 4.5 4.0 3.5 3.0 +85˚C -40˚C 2.5 2.0 +25˚C 1.5 1.0 0.5 0.0 0 20 40 60 80 100 AM Modulation Depth (%) Note: 28 AM modulation frequency 20 kHz; generator level 40 dBµV. ATR4255P 4883B–AUDR–01/06 ATR4255P Figure 8-3. Multipath Sensor Frequency Response Sensor Output Voltage (V) 5.0 4.5 90% at +85˚C 90% at +25˚C 4.0 90% at -40˚C 3.5 3.0 2.5 60% at +85˚C 60% at +25˚C 60% at -40˚C 2.0 1.5 1.0 0.5 0.0 100 1000 10000 100000 AM Modulation Frequency (Hz) Note: Generator level 40 dBµV. Figure 8-4. Deviation Sensor 5 Deviation Sensor Output Voltage (V) 4 +85˚C 3 2 -40˚C 1 0 0 20000 40000 60000 80000 100000 Frequency Deviation (Hz) Note: FM modulation frequency: 1 kHz; BW setting 2nd IF filter = 120 kHz. Figure 8-5. Deviation Sensor Frequency Response Sensor Output Voltage (V) 1.0 0.5 0.0 100 1000 10000 100000 FM Modulation Frequency (Hz) Note: FM frequency deviation: 22.5 kHz. 29 4883B–AUDR–01/06 FM Input Level Sweep 10 5 0 4.5 MPX Output (dB) Signal -10 4 -20 3.5 Sensor output -30 3 -40 2.5 -50 2 Noise -60 Field Strength Sensor Output Voltage (V) Figure 8-6. 1.5 -70 -20 0 20 40 60 80 100 1 120 Input Level (dBµV) 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 20 4.5 Pdes/Pundes (dB) 10 4 Pdes/Pundes 0 3.5 -10 3 -20 2.5 -30 2 -40 1.5 Adjacent -50 1 -60 0.5 -70 -250 -200 -150 -100 -50 0 50 100 150 200 Adjacent Channel Output Voltage (V) Note: 0 250 Frequency Offset (kHz) Note: 30 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. ATR4255P 4883B–AUDR–01/06 ATR4255P Figure 8-8. Test Circuit Test Point 1 44 2 43 3 42 VS 4 41 P41 10n 5 40 6 39 7 38 8 37 9 36 10 35 11 34 330 VS VS 4n7 1k 270 2k2 100 600 100n 100p P29 100n 10 15p 100n 10n 2n2 100n 10n 100n 12 6p8 100n 13 ATR4255P P41 200k 33 100n 32 47p 10k 5k6 P29 P31 14 31 15 30 16 29 22p 1n V P29 22n 10k 220n 10k Bus 17 28 18 27 19 26 20 25 21 24 220n Pin1 ATR4256 Pin19 Pin15 10n 10k VS 10n 22 82p 2k2 23 31 4883B–AUDR–01/06 32 4µ7 L301 220n C315 R306 470k 220n C316 S391D FM 75Ω D302 Ant R307 47 T111 J109 T302 BC848 L303 2m2 2k2 R311 6p8 C319 S391D D301 10n C302 2k2 R308 R105 100 100n C311 BC 858C T301 T102 BC858 100 µH L302 2µ2 C106 L102 10p C113 100n 3p9 C102 F201 2 43 1n C56 D101 S391D 10n D103 C103 F101 10n BB804 27p C104 18p C107 6p8 C108 C109 1 44 100p C in F201 BB804 D102 T101 BFR93A R112 47k R104 470 F102 68k R102 390 R313 470n C111 C112 10µ R103 1k 10n C117 R115 1k 12p C306 10n C209 R29 10 4 41 68k R122 68k R121 C314 10n C110 4n7 3 42 10n C307 100n C201 5 40 C308 100n 6 39 R34 27 7 38 9 C116 100n 12 R151 8k2 14 15 30 22p 1n C152 330p C134 R131 5k6 BB804 F131 47p 1 20 C131 C132 13 31 220n C207 220n C208 32 D131 C133 6p8 220n C114 11 100n 10 33 X301 ATR4255P 10µ 35 34 C205 10n C206 1k5 R305 C115 22µ C203 8 36 470n C204 R111 200k C202 37 1µ KR201 R304 1k3 3 18 17 28 C158 10n 10n C151 2 19 16 29 KR202 4 17 18 27 16 19 26 20 25 10n C159 DAC3 5 21 15 6 1n 10n C312 8 13 9 12 Q151 12p* 10 11 12p* 10.25 MHz C153 C154 22 23 F302 R106 10 10n C157 SWO1 SWO3 SWO2 SWO4 7 14 100n R303 1k C310 24 C155 C156 10n C309 220n ATR4256 KF302 GND EN CLK DATA IF2OUT INT DEV MULTIP VS (+8.5V to 10.5V) METER ADJAC MPX *depends on Q151 R152 10 10 R407 Figure 8-9. Application Circuit ATR4255P 4883B–AUDR–01/06 ATR4255P 9. Ordering Information Extended Type Number Package Remarks ATR4255P-ILSY SSO44 Tube, lead-free ATR4255P-ILQY SSO44 Taped and reeled, lead-free 10. Package Information 9.15 8.65 Package SSO44 Dimensions in mm 18.05 17.80 7.50 7.30 2.35 0.3 0.25 0.10 0.8 16.8 44 0.25 10.50 10.20 23 technical drawings according to DIN specifications 1 22 33 4883B–AUDR–01/06 Atmel Corporation 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 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 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 1150 East Cheyenne Mtn. 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