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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 ATR4255
Electrostatic sensitive device. Observe precautions for handling.
Description
The ATR4255 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.
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Figure 1. Block Diagram
AMPLPF MX2OB IF1AMI V3 IF1FMI MX1OA MX1OB IF1REF IF1OUT MX2IN MX2OA 8 AMAGC AMVREG 7 6 AGC
FM
IF2IN 28
V3P 27
IF2OUT 20
43 44
38
39
33
AM
30 29
26
23
24
AM dem. MX1AMA MX1AMB 41 3 V3 AGC AM
32
OPLPF
36 35
IFAGCL IFAGCCH
GNDMX MX1FMB MX1FMA
4 2 1 FM AGC Automatic adjustment
37
FILADJ
OSCOUT
16
Divider Adj. chan . OSC V3 Bus 17 18 19 5 Bandgap 12 25 42 9 METER 22 MX2LO 10 ADJAC
Multipath 11 Soft mute
GNDOSC
15
Stop
FM dem.
MPX
OSCE 14 OSCB 13
INT 21 INT 40 MULTIP 34 SMUTE
Dev. ana. 31 DEV
GND EN DATA FMAGC V57 VS CLK
Pin Configuration
Figure 2. Pinning SSO44
MX1AMA MULTIP IFAGCL IFAGCH MX2OA INT 21 24 30 IF1OUT MX1OB MX1OA SMUTE IF1REF OPLPF IF1AMI IF1FMI MX2OB MX2LO 22 23 FILADJ MX2IN 26 DATA 19 IF2IN GND IF2OUT 20 25
31 DEV
VS
29
44
43
42
41
40
39
38
37
36
35
34
33
V57 12
OSCB 13
32
OSCE 14
GNDOSC 15
OSCOUT 16
EN 17
28
MX1AMB
MX1FMA
MX1FMB
AMPLPF
GNDMX
FMAGC
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AMVREG
AMAGC
METER
ADJAC 10
MPX 11
CLK 18
1
2
3
4
5
6
7
8
9
27
V3P
V3
ATR4255
Pin Description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Symbol MX1FMA MX1FMB MX1AMB GNDMX FMAGC AMVREG AMAGC AMPLPF METER ADJAC MPX V57 OSCB OSCE GNDOSC OSCOUT EN CLK DATA IF2OUT INT MX2LO MX2OB MX2OA GND MX2IN V3P IF2IN V3 IF1OUT DEV OPLPF IF1AMI SMUTE IFAGCH IFAGCL FILADJ IF1FMI IF1REF MULTIP MX1AMA VS MX1OA MX1OB Function 1st mixer FM input A 1st mixer FM input B 1st mixer AM input B Ground 1st mixer, preamplifier AGC FM preamplifier AGC AM control voltage AM preamplifier AGC AM AGC LP filter Field strength output Adjacent channel detection output Multiplex signal 5.7 V reference voltage Oscillator basis Oscillator emitter Oscillator ground Oscillator output 3-wire bus enable 3-wire bus clock 3-wire bus data 2nd IF amplifier output Interrupt, stop signal 10.25 MHz input for 2nd mixer 2nd mixer output B 2nd mixer output A Ground 2nd mixer input 3 V reference for AMPIN, AMIFAGC, Control, IF2IN 2nd IF amplifier input 3 V 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 IF AGC LP filter low time constant Filter adjust 1st IF FM amplifier input 1st IF and MX1OUT reference, MX1AM A, MX1AM B Multipath detection output 1st mixer AM input A Supply voltage 1st mixer output A 1st mixer output B
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Functional Description
The ATR4255 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 softmute 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. The bus protocol and the bit-to-register mapping is described in the section "3-wire Bus Description" on page 17. The meaning of the control bits is mentioned in the following sections.
Reception Mode
The IC can be operated in four different modes. Mode AM, FM, WB, Standby are selected by means of bit 92 and bit 93 according to Table 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 pin 23, pin 24 is increased and the input of the 2nd IF amplifier can be switched between pin 23, pin 24 and pin 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 1. Operating Mode
AM/FM/Weather Channel Standby FM AM Weather band Bit 93 0 0 1 1 Bit 92 0 1 0 1
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Test Mode
A special test mode is implemented for final production test only. This mode is activated by setting bit 9 = 1. This mode is not intended to be used in customer application. For normal operation, bit 9 has to be set to 0. Bit 18 to bit 30 are deactivated in normal operation mode. Table 2. Test Mode
Mode Normal operation Testmode Bit 9 0 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 U4256BM. The VCO signal is provided at the buffered output pin 16 to be fed to the PLL circuit. 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) 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 bit 64 and bit 65 according to Table 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 by bit 89 to bit 91. Table 3. FM-AGC Threshold
FM-AGC Threshold 104 dBV 101 dBV 98 dBV 92 dBV Bit 65 0 0 1 1 Bit 64 0 1 0 1
FM RF-AGC
Figure 3. FM RF-AGC Bit 92
VS
Pin 42 C111 Pin 5 R115
PIN Diode
AGC
B92
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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 62 and bit 63. 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 4. AM-AGC Threshold
AM-AGC Threshold 99 dBV 102 dBV 104 dBV 105 dBV Bit 63 0 0 1 1 Bit 62 0 1 0 1
FM 1st Mixer AM 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. The AM 1st mixer is used for up-conversion of the AM reception frequency to the 1st 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 according to Table 5. Table 5. Divide Factor of the AM Prescaler
Divider AM Prescaler Divide by 10 Divide by 6 Divide by 7 Divide by 8 Divide by 4 Bit 93 1 1 1 1 1 Bit 92 0 0 0 0 0 Bit 84 x x x x x Bit 83 0 0 0 1 1 Bit 82 0 0 1 0 0 Bit 81 0 1 0 0 1
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 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.
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Table 6. Gain of the FM IF Amplifier
Gain FM IF 20 dB 22 dB 24 dB 26 dB 28 dB 29 dB 30 dB 31 dB Bit 91 0 0 0 0 1 1 1 1 Bit 90 0 0 1 1 0 0 1 1 Bit 89 0 1 0 1 0 1 0 1
Table 7. Temperature Coefficient Setting of FM IF Amplifier
Temperature Coefficient (TC) of the IF Amplifier TKmin TKmax Bit 66 0 1
AM 1st IF Amplifier 2nd Mixer
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.
The 2nd 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 bandwidth of the tank at the mixer output. The output resistance can be selected by bit 60 and bit 61. Table 8. 2nd Mixer Output Resistance in FM Mode
Bit 61 0 0 1 1 Bit 60 0 1 0 1 Output Resistance (Bit 54 = 0) 3.3 k 0.63 k 0.47 k 0.29 k Output Resistance (Bit 54 = 1) ~100 k 0.78 k 0.55 k 0.32 k
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 U4256BM. Table 9. FM Bandwidth Mixer 2
Bit 61 0 0 1 1 Note: Bit 60 0 1 0 1 FM BW Mixer 2 150 kHz 200 kHz 250 kHz 450 kHz
The bandwidth is also depending from the values of the application circuit.
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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, 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 10. 2nd IF Filter in FM Mode
2nd IF Filter Internal filter External and internal filter Bit 54 0 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 11. IF-AGC Time Constant
Mode FM/WB AM reception AM search Bit 92 1 0 0 Bit 88 X 0 1 IF AGC Time Constant IFAGCL (fast) IFAGCH (slow) 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 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.
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 = 1. Table 12. Pin 20 Output Setting
Pin 20 2
nd
Bit 55 0 1
IF output
Multipath field strength
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.
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Figure 4. Automatic IF Center Frequency Adjustment
Pin 22 10.25 MHz
Automatic frequency adjustment + Bits 56 to 59
center freq. center freq.
FM demod
FM bandfilter Adj. channel sensor
Pin 37
Bits14 to 17 center + freq. Bits 5, 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 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 if bit 4 is set to 1. If bit 4 is set to 0, the default setting is used. Table 13. 2nd IF Center Frequency
IF Center 450.00 kHz 456.25 kHz 461.50 kHz 468.75 kHz 475.00 kHz 481.25 kHz 487.50 kHz 493.75 kHz 450.00 kHz 443.75 kHz 437.50 kHz 431.25 kHz 425.00 kHz 418.75 kHz 412.50 kHz 406.25 kHz Bit 59 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 Bit 58 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 Bit 57 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 Bit 56 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
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Table 14. FM Band Filter Center Frequency Correction
IF Correction -0 kHz -6.25 kHz -12.50 kHz -18.75 kHz -25.00 kHz -31.25 kHz -37.50 kHz -43.75 kHz +0 kHz (default) +6.25 kHz +12.50 kHz +18.75 kHz +25.00 kHz +31.25 kHz +37.50 kHz +43.75 kHz Bit 17 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 Bit 16 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 Bit 15 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 Bit 14 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
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 by bit 0 to 3 (see Table 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 by means of bit 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 = 1) can be used for this purpose. Table 15. Bandwidth of the Integrated FM Band Filter
IF Bandwidth 200 kHz 190 kHz 180 kHz 170 kHz 160 kHz 150 kHz 140 kHz 130 kHz 120 kHz 110 kHz 100 kHz 90 kHz 80 kHz 70 kHz 60 kHz 50 kHz Bit 3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 Bit 2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 Bit 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 Bit 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
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FM Demodulator
For weather band reception, the gain of the FM demodulator is increased and can be adjusted by means of bit 71, bit 72 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. Figure 5. FM Demodulator Automatic Fine Tuning
FM demod
MPX AM AGC B92 IFAGCH V3 (10 nF)
Center freq. + Bit 53
Automatic frequency adjustment
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 active (bit 7 = 1). This adjustment will affect the center frequency of all integrated filters as mentioned before. Table 16. Demodulator Gain in Weather Band Mode
Demodulator Gain in Weather Band Mode Relative to FM Mode 12 dB 15 dB 18 dB 21 dB Bit 72 0 0 1 1 Bit 71 0 1 0 1
Table 17. Demodulator Fine Adjustment
Demodulator Fine Adjustment Fine tuning ON Fine tuning OFF Bit 53 0 1
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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 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 capacitor between pin 34 and pin 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. Table 18. Soft Mute Threshold
Relative Soft Mute Threshold Soft mute OFF -18 dB -15 dB -12 dB -9 dB -6 dB -3 dB 0 dB Bit 70 0 0 0 0 1 1 1 1 Bit 69 0 0 1 1 0 0 1 1 Bit 68 0 1 0 1 0 1 0 1
Table 19. Maximum Soft Mute
Maximum Value of Soft Mute 28 dB 24 dB Bit 67 0 1
Figure 6. Soft Mute
+ FS (pin 9) Pin 34 Bit 67
Gain FM demodulator Bits 68 to 70 Pin 29 V3
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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 bit 1. The bandwidth of the lowpass filter at the MPX output can be set by means of bit 79 to 90 kHz or 180 kHz. Table 20. MPX Output Mute
MPX Output MPX out, pin 11 normal operation Mute ON Bit 7 0 1
Table 21. MPX Output Bandwidth
Bandwidth MPX Lowpass Filter 90 kHz 180 kHz Bit 79 0 1
Receiving Condition Analyzer Field Strength Sensor
The ATR4255 implements several sensors that provide information about the receiving condition of the selected station. 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 by 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 22. Field Strength Selection
Field Strength Narrow Band/Wide Band Fieldstrength at pin 26 (wide band) Fieldstrength from IF-AGC (narrow band) Bit 80 0 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 by bit 85 to bit 87 in the range of 0.5 kHz to 80 kHz. 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 bit 73 to bit 78. The inverted STOP signal is available at pin 21 according to Table 25 on page 14. The frequency of 10.25 MHz at pin 22 is used as time reference.
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Table 23. Search Stop Detector Measurement Time
Time Window for Stop Signal 1 x 3.1969 ms ..... 63 x 3.1969 ms 1 1 1 1 1 1 Bit 78 0 Bit 77 0 Bit 76 0 Bit 75 0 Bit 74 0 Bit 73 1
Table 24. Search Stop Window
Search Stop Window 0.5 kHz 1.1 kHz 2.3 kHz 4.8 kHz 10 kHz 20 kHz 40 kHz 80 kHz Bit 87 0 0 0 0 1 1 1 1 Bit 86 0 0 1 1 0 0 1 1 Bit 85 0 1 0 1 0 1 0 1
Table 25. Signals Available at Digital Output Pin 21
Bit 88 0 0 1 1 Bit 92 0 (AM) 1 (FM/WB) 0 (AM) 1 (FM/WB) INT (Pin 21) 1 NOT MPINT NOT STOP 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 lowpass-filtered MPX signal (see Figure 7). The output voltage at pin 31 is proportional to the frequency deviation in FM/WB or the modulation depth in AM respectively. Figure 7. Deviation Sensor
+
MPX 4k Pin 31
25k
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Adjacent Channel Sensor
The adjacent channel sensor is active in FM mode only 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 2 nd IF frequency (bit 5, bit 6), it can be determined whether the disturbance signal is located above or below the reception frequency (see Table 28 on page 16). The bandwidth of the band filter used in the adjacent channel sensor can be changed by means of bit 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. Figure 8. Adjacent Channel Sensor
IF intergr. FM bandfilter
+
+ log
4k
50k
Pin 10
log
Table 26. Bandwidth of the Adjacent Channel Detector Filter
BW Adjustment 3 kHz 16 kHz 32 kHz 50 kHz 65 kHz 80 kHz 95 kHz 110 kHz 50 kHz 65 kHz 80 kHz (default) 95 kHz 110 kHz 130 kHz 145 kHz 160 kHz Bit 13 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 Bit 12 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 Bit 11 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Bit 10 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
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Table 27. Center Frequency Adjacent Channel Sensor
Center Frequency 450 kHz 300 kHz 700 kHz Filter OFF Bit 6 0 0 1 1 Bit 5 0 1 0 1
Table 28. Output Voltage of Adjacent Channel Sensor for Different Receiving Conditions and Center Frequencies
Adjacent Channel Disturbance no below above 300 kHz high high low 450 kHz low high high 600 kHz high low 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 9. Multipath Sensor
+
4k
Pin 40
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 a threshold adjustable by bit 81 to bit 84 (see Table 30 on page 17), the MPX signal may be muted and this situation (MPINT) can be signalized at pin 21 (INT) according to Table 25 on page 14. Muting of the MPX signal during multipath disturbances can be activated be setting bit 8. Table 29. Multipath Noise Canceller
Multipath Noise Canceller Active Not active Bit 8 0 1
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Table 30. Sensitivity of the MNC
Sensitivity MNC (Threshold) Off Low (-18 dB) Bit 93 x x x x x x x Normal (-12 dB) x x x x x x x x High (-9 dB) x Bit 92 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Bit 84 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 Bit 83 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 Bit 82 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 Bit 81 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
3-wire Bus Description
The register settings of ATR4255 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 31 on page 19) 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 ATR4255 are compatible to the addressing used in U4256BM. That means ATR4255 and U4256BM can be operated on the same 3-wire bus as shown in the application circuit.
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Figure 10. Pulse Diagram
8-bit command
EN DATA CLK
LSB BYTE 1 MSB
24-bit command
EN DATA CLK
LSB BYTE 1 MSB LSB BYTE 2 MSB LSB BYTE 3 MSB
Figure 11. Bus Timing
tR tF
Enable tS tR Data tHDA tS tR Clock tF tF tHEN
tH tL
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Data Transfer
Table 31. Control Registers
A24_100 MSB ADDR. 1 0 0 BYTE 3 AM/FM/ WB AM B93 FM B92 B91 B90 B89 B88 B87 B86 B85 B84 B83 B82 B81 B80 B79 B78 B77 B76 B75 B74 B73 LSB Gain FM IF amplifier MSB BYTE 2 LSB MSB BYTE 1 Time window stop signal LSB OSC divider/multipath Field BWM sensitivity strength PX
Search Width of window
A24_101 MSB ADDR. 1 0 1 B72 B71 B70 B69 B68 B67 B66 B65 B64 B63 B62 B61 B60 B59 B58 B57 B56 B55 B54 B53 BYTE 3 WBDemodGain LSB Start Smute MSB Smute TkFM IF BYTE 2 FM-AGC AM-AGC LSB MSB FM BW 2nd mixer BYTE 1 MP FS FM ext LSB Dem. Not Adj. used x B52
IF2 center frequency
A24_111 MSB ADDR. 1 1 1 B30 B29 B28 B27 B26 B25 B24 BYTE 3 LSB MSB used in test mode only x B23 x B22 B21 B20 B19 B18 BYTE 2 LSB MSB BYTE 1 LSB center frequency of bandfilter 1 B17 0 B16 0 0 bandwidth adj. channel sensor 0 1 B12 0 B11 1 B10
B15 B14 B13
A8_100 MSB ADDR. 1 0 0 BYTE 1 Test MPoff Mute 0 B9 B8 B7 B6 B5 LSB Adj. channel sensor
A8_101 MSB ADDR. 1 0 1 B4 B3 B2 B1 B0 BYTE 1 Optimize Band width LSB
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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 Supply voltage, pin 42 Power dissipation Junction temperature Ambient temperature range Storage temperature range Symbol VS Ptot Tj Tamb Tstg Value 10 1000 150 -40 to +85 -50 to +150 Unit V mW C C C
Thermal Resistance
Parameters Junction ambient, soldered to PCB Symbol RthJA Value 60 Unit K/W
Operating Range
All voltages are referred to GND (pin 25). Parameters Supply voltage range, pin 42 Ambient temperature Symbol VS Tamb Min. 7.5 -40 Typ. 8.5 Max. 10 +85 Unit V C
Electrical Characteristics
Test conditions (unless otherwise specified): VS = 8.5 V, Tamb = 25C. No. 1 1.1 1.2 1.3 2 2.1 2.2 2.3 2.4 2.5 Parameters Power Supply Supply voltage Supply current Supply current VCO Frequency range DC bias voltage Buffer output voltage Buffer output resistance Buffer output DC voltage fosc = 120 MHz 13 16 16 16 2.8 fVCO 70 2.8 130 3.0 150 70 3.0 3.2 160 3.2 250 MHz V mVrms V D A A D A Standby mode (bit 92 = 0, bit 93 = 0) Other operation modes 42 42 42 VS IStby IS 7.5 8.5 20 50 10 25 60 V mA mA C A A Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
20
ATR4255
4837A-AUDR-10/04
ATR4255
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): VS = 8.5 V, Tamb = 25C. No. 3 3.1 3.2 3.3 3.4 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6 6.1 6.2 Parameters FM RF-AGC Saturation voltage Saturation voltage Threshold level Maximum threshold level No input signal No input signal In-band signal Out-of-band signal (110 MHz), bit 64, 65 = 0 No input signal No input signal Bit 92 = 1 Bit 92 = 1 V(pin 8) = 3 V V(pin 8) = 3 V V(pin 8) = 6 V Bits 62, 63 = 0 5 5 30 1 100 8.3 VS - 0.2 110 102 104 V V dBV dBV A B D A Test Conditions Pin Symbol Min. Typ. Max. Unit Type*
AM RF-AGC, AM Mode (Bit 92 = 0, Bit 93 = 1) Saturation voltage Saturation voltage Output voltage for minimum gain Output voltage for minimum gain Maximum control voltage Maximum control voltage Minimum control voltage Minimum threshold level 7 7 7 7 6 6 6 41 97 6.5 8.3 VS - 0.2 6.5 6.8 VS - 1.7 7.0 VS - 1.5 0.2 99 0.7 101 7.5 7.1 V V V V V V V dBV A B A B A B A A
AM Mixer, AM Mode (Bit 92 = 0, Bit 93 = 1) Supply current Conversion conductance 3rd-order input intercept point Noise figure (SSB) Input bias DC voltage Input resistance Input capacitance Maximum output voltage Output resistance FM Mixer (FM Mode (Bit 92 = 1, Bit 93 = 0) Supply current Conversion conductance Sum of current in pins 43, 44 43, 44 1, 2, 43, 44 15 17.5 7 20 mA mS A D Differential Single-ended, pin 39 AC-grounded Pin 3 AC-grounded Generator resistance 2.5 k (pin 41) Sum of current in pins 43, 44 43, 44 3, 41, 43, 44 41 43, 44 3, 41 3, 41 3, 41 43, 44 43, 44 12 100 IP3AMmix NFAMmix 2.4 14 16 4.1 132 14 2.6 2.5 3 2.9 20 mA mS dBV dB V k pF Vpp k A D C C A D D D D
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
21
4837A-AUDR-10/04
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): VS = 8.5 V, Tamb = 25C. No. 6.3 6.4 6.5 6.6 6.7 6.8 7 7.1 7.2 7.3 7.4 7.5 7.6 8 8.1 8.2 8.3 8.4 8.5 8.6 9 9.1 9.2 9.3 9.4 9.5 9.6 Parameters 3 -order intercept point Noise figure (DSB) Input resistance Input capacitance Maximum differential output vltage Output resistance
st rd
Test Conditions
Pin 1, 2
Symbol IP3FMmix NFFMmix
Min.
Typ. 120 10 1.6 5
Max.
Unit dBV dB k pF Vpp k
Type* C C D D D D A D D D D D
Generator resistance 200 Pin 2 AC-grounded VS = 8.5 V
43, 44 1, 2 1 43, 44 43, 44
12 100 19 TKmin TKmax 21 0.039 0.044 270 270 330 5 330 400 400 23
1 IF FM Amplifier, FM Mode (Bit 92 = 1, Bit 93 = 0) Minimum voltage gain Temperature coefficient of gain Temperature coefficient of gain Input resistance Input capacitance Output resistance
st
Bits 89, 90, 91 = 0 Bit 66 = 0 Bit 66 = 1 Pin 39 AC-grounded Pin 39 AC-grounded
38, 30
dB dB/K dB/K pF
38 38 30
1 IF AM Amplifier, AM Mode (Bit 92 = 0, Bit 93 = 1) Maximum voltage gain Gain control range Noise figure Input resistance Input capacitance Output resistance 2
nd
330 load at pin 30
30, 33
16 26
dB dB dB k
D D C D D D A D D C C D
Generator resistance 2.5 k 33 Pin 39 AC-grounded 33 30 Bit 92 = 1, bit 93 = 0 Bit 92 = 0, bit 93 = 1 23, 24 23, 24 26, 23, 24 Generator resistance 330 (pin 26) 23, 24 26 Bit 92 = 0, bit 93 = 1 23, 24
NFIFAM 10
20
1 270 10 8 330 14 10 2 NFMix2 IP3Mix2 100 23 132 400 16 12
pF mA mA mS dB dBV k
Mixer
FM supply current AM/WB supply current Conversion conductance Noise figure (SSB) 3rd-order input intercept point AM/WB output resistance Maximum differential output voltage AM/WB
9.7
VS = 8.5 V
23, 24
12
Vpp
D
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
22
ATR4255
4837A-AUDR-10/04
ATR4255
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): VS = 8.5 V, Tamb = 25C. No. 9.8 9.9 9.10 9.11 9.12 10 10.1 10.2 10.3 10.4 10.5 10.6 10.7 11 11.1 Parameters Maximum differential output voltage FM Input resistance LO input voltage LO input resistance LO input bias voltage 2nd IF Amplifier (Bit 55 = 0) Input resistance Maximum voltage gain Gain control range Maximum voltage gain DC output voltage AC output voltage Output impedance Unmodulated signal, 82 dBV at pin 1 (IF AGC active) Small signal Deviation = 75 kHz, fmod = 1 kHz Deviation = 75 kHz, fmod = 38 kHz (reference: 1 kHz) Deviation = 75 kHz, fmod = 1 kHz Dev. = 22.5 kHz, fmod = 1 kHz, 50 s de-emphase, signal input at 450 kHz Bit 67 = 0, V (pin 34) = 2 V Bit 67 = 1, V (pin 34) = 2 V Bits 89 to 91 = 0, Bits 68 to 70 = 1 Modulation depth = 80%, fmod = 1 kHz Modulation depth = 80%, fmod = 1 kHz, V(pin 35) = const. Pin 27 AC-grounded AM/WB mode (Bit 93 = 1) AM/WB mode (Bit 93 = 1) FM mode (bit 92 = 1, bit 93 = 0, bit 54 = 0) 23, 24 20 20 20 20 3.1 145 28 28, 20 44 3 47 44 37 3.4 175 70
nd
Test Conditions
Pin 23, 24 26 22 22 22
Symbol
Min. 1 270 80
Typ.
Max.
Unit Vpp
Type* D D D D A D A D D A A D
330 1
400 500
mVpp k V k
2.8
3.0
3.2
50
dB dB dB
3.7 200
V mVrms
FM Demodulator Integrated Bandfilter, FM Mode (Bit 92 = 1, Bit 93 = 0), BW Setting 2 AC output voltage 11 420 480
IF Filter = 120 kHz 540 mVrms A
11.2
Stereo roll-off Total harmonic distortion Maximum signal-tonoise ratio
11
-2.3
-2.0
-1.7
dB
A
11.3
11
THDFM
0.4
0.7
%
A
11.4
11
(S/N)FM
62
65
dB
A
12 12.1 12.2 12.3 13 13.1
Soft Mute, FM Mode (Bit 92 = 1, Bit 93 = 0, Bit 80 = 0) Mute gain Mute gain Soft mute threshold 11 11 1 -31 -26 50 -28 -24 53 -26 -22 56 dB dB dBV A A B
AM Demodulator, AM Mode (Bit 92 = 0, Bit 93 = 1) AC output voltage Total harmonic distortion 11 350 400 450 mVrms A
13.2
11
THDAM
0.6
2
%
A
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
23
4837A-AUDR-10/04
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): VS = 8.5 V, Tamb = 25C. No. 13.3 14 14.1 14.2 14.3 15 15.1 15.2 15.3 15.4 16 16.1 16.2 17 17.1 17.2 Parameters Maximum signal-to-noise ratio MPX Output DC output voltage Mute gain Output resistance LOW saturation voltage LOW output resistance HIGH saturation voltage HIGH output resistance Offset voltage Output voltage FM dev. = 0 kHz FM dev. = 75 kHz, fmod = 1 kHz No signal Unmodulated signal 84 dBV at pin 1 Bit 7 = 1 Bit 7 = 1, FM dev. = 75 kHz, fmod = 1 kHz Small signal 11 11 11 2.15 2.25 -70 60 2.4 -50 V dB A A D Test Conditions Modulation depth = 80%, fmod = 1 kHz, 74 dBV at pin 41 Pin 11 Symbol (S/N)AM Min. 52 Typ. 54 Max. Unit dB Type* A
Search Stop Detector, INT Output 21 21 21 21 4.5 0 0.3 4.75 1 5.0 0.5 V k V k A D A D
Deviation Sensor, FM Mode (Bit 92 = 1, Bit 93 = 0) 31 31 1.7 20 2.0 150 2.5 mV V A A
Field Strength Sensor, FM Mode (Bit 92 = 1, Bit 93 = 0, Bit 89-91 = 0, Bit 80 = 0) Offset voltage Output voltage 9 9 0.4 2.7 0.75 3.0 1.1 3.3 V V A A
Field Strength Sensor, AM Mode (Bit 92 = 0, Bit 93 = 1, Bit 80 = 1) 17.3 17.4 18 18.1 Output voltage LOW field strength Output voltage HIGH field strength 63 dBV at pin 28 94 dBV at pin 28 9 9 0.7 2.3 0.9 2.5 1.1 2.7 V V A A
Multipath Sensor, FM Mode (Bit 92 = 1, Bit 93 = 0) Offset voltage Unmodulated signal, 60 dBV at pin 1 AM modulation depth = 60%, fmod = 20 kHz, 60 dBV at pin 1 Unmodulated signal FM dev. = 50 kHz, fmod = 1 kHz 40 20 200 mV A
18.2
Output voltage
40
1.4
1.8
2.2
V
A
19 19.1 19.2
Adjacent Channel Sensor, FM Mode (Bit 92 = 1, Bit 93 = 0), Bit 4 = 0 (Default BW Setting) Offset voltage Output voltage 10 10 100 0.6 300 1.0 mV V A A
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
24
ATR4255
4837A-AUDR-10/04
ATR4255
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): VS = 8.5 V, Tamb = 25C. No. Parameters Test Conditions Desired FM dev. = 75 kHz, fmod = 1 kHz undesired: unmodulated RF level undesired/desired: +30 dB frequency offset = -150 kHz Pin Symbol Min. Typ. Max. Unit Type*
19.3
Output voltage
10
1.0
1.2
1.6
V
A
20 20.1 20.2 20.3 20.4 20.5
3-wire Bus Input voltage LOW Input voltage HIGH Leakage current Clock frequency Period of CLK HIGH LOW Rise time EN, DATA, CLK Fall time EN, DATA, CLK Set-up time Hold time EN Hold time DATA Internally Generated Reference Voltages Output voltage Output voltage Output voltage Output voltage 12 29 27 39 5.5 5.7 3.0 3.0 3.0 6.0 V V V V A D D D V = 0 V, 5 V 17, 18, 19 17, 18, 19 17, 18, 19 18 tH tL tr tf ts tHEN tHDA 100 250 0 250 250 400 100 2.7 10 1.0 0.8 V V A MHz ns ns ns ns ns ns ns D D D D D
20.6 20.7 20.8 20.9 20.10 21 21.1 21.2 21.3 21.4
D D D D D
*) Type means: A =100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
25
4837A-AUDR-10/04
Diagrams
The following data was measured with the application board (see Figure 20). 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 output 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 12. FM Demodulator
1.0 0.9 1 0.9 0.8
+85C
MPX Output Voltage (Vrms)
0.8 0.7 0.6 0.5
MPX -40C
0.7
0.5 0.4 0.3
0.4 0.3 0.2 0.1 0.0 0 10 20 30 40 50 60
+85C
THD
-40C
0.2 0.1 0 100
70
80
90
Frequency Deviation (kHz)
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 13. Multipath Sensor
5.0 4.5
Sensor Output Voltage (V)
4.0 3.5 3.0 +85C 2.5 2.0 +25C 1.5 1.0 0.5 0.0 0 20 40 60 80 100 -40C
AM Modulation Depth (%)
Note:
AM modulation frequency 20 kHz; generator level 40 dBV.
26
ATR4255
4837A-AUDR-10/04
THD (%)
0.6
ATR4255
Figure 14. Multipath Sensor Frequency Response
5.0 4.5 90% at +85C 90% at +25C 90% at -40C
Sensor Output Voltage (V)
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 100 1000 10000
60% at +85C 60% at +25C 60% at -40C
100000
AM Modulation Frequency (Hz)
Note:
Generator level 40 dBV.
Figure 15. Deviation Sensor
5
4
Deviation Sensor Output Voltage (V)
3
+85C
2
-40C
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 16. Deviation Sensor Frequency Response
1.0
Sensor Output Voltage (V)
0.5
0.0 100 1000 10000 100000
FM Modulation Frequency (Hz)
Note:
FM frequency deviation: 22.5 kHz.
27
4837A-AUDR-10/04
Figure 17. FM Input Level Sweep
10 0 Signal -10 4 3.5 3 2.5 2 Noise -60 -70 -20 0 20 40 60 80 100 1.5 1 120 5 4.5
-20 -30 -40 -50
Sensor output
Input Level (dBV)
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 18. Selectivity
20 10
Pdes/Pundes
4.5 4 3.5 3 2.5 2
Adjacent
0 -10 -20 -30 -40 -50 -60 -70 -250
1.5 1 0.5 0 250
-200
-150
-100
-50
0
50
100
150
200
Frequency Offset (kHz)
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.
28
ATR4255
4837A-AUDR-10/04
Adjacent Channel Output Voltage (V)
Pdes/Pundes ( dB )
Fieldstrength Sensor Output Voltage (V)
MPX Output (dB)
ATR4255
Figure 19. Test Circuit
Test Point 1 330 4n7 VS 2 3 1k 100 4 5 600 6 100p 7 8 100n 15p 10 2n2 10n P41 11 12 6p8 47p 14 10k 1n V 16 10k Bus U4256BM Pin15 10k 17 18 19 Pin19 10n 20 21 22 25 24 VS 10n 23 2k2 29 220n 28 27 220n 26 Pin1 5k6 22p 15 30 P29 22n 10k 31 100n 13 9 10n 10 35 36 100n 41 40 39 100n 38 37 100n P29 P41 10n 43 42 VS 270 2k2 44 VS
ATR4255
100n 34 200k 33 100n 32 P29
P31
82p
29
4837A-AUDR-10/04
Figure 20. Application Circuit
30
R407 VS (+8.5 V to 10.5 V) 10 MULTIP DEV R34 27 KR202 X301 KF302 R305 1k5 C in F201 C206 10n C205 220n 1n 30 29 28 27 26 25 24 23 33 32 31 10 35 34 C207 C310 10n C312 R152 10 220n 220n C208 C309 F302 C113 100n 100p 1 C204 470n C111 44 43 42 41 40 39 38 37 36 470n 10n R111 200k C202 C307 R303 1k R106 10 F201 C209 100n 10n C201 KR201 R304 1k3 R29 10 C308 100n C112 10
ATR4255
ATR4255
1 R313 22u 220n 47p F131 C314 10n C110 4n7 BB804 R121 68k R131 5k6 20 10p C56 27p T101 BFR93A F101 BB804 R122 D101 C102 D103 C103 10n 68k C158 10n C159 10n C157 10n MPX ADJAC C115 100n C116 100n METER C104 10n C134 19 18 17 16 15 14 D131 C156 10n 22p DATA CLK EN GND C155 100n C153 C154 12p* Q151 13 12 11 12p* 10.25 MHz *depends on Q151 390 C108 C109 1n C107 D102 18p BB804 R104 470 R112 47k 6p8 C133 6p8 C203 C114 C131 C132 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 INT IF2OUT R102 68k F102
L302
C319
100H
C306
6p8
12p
R311
2k2
L303 2m2
R105 100
R115 1k
T102 BC858
T302 BC848
C316
R308
T301
220n
2k2
BC 858C
R306 470k
T111 J109
R307 47 C106 L102 22
C315 C302
220n
10n
U4256BM
1n 1 2 3 C151 R151 8k2 C152 330p 10n DAC3 SWO1 SWO3 SWO2 SWO4 4 5 6 7 8 9 10
C117
10n
L301
D301
47 3p9 S391D
Ant
S391D
FM 75
D302
C311
S391D
100n
R103 1k
4837A-AUDR-10/04
ATR4255
Ordering Information
Extended Type Number ATR4255-ILSH ATR4255-ILQH Package SSO44 SSO44 Remarks Tube, lead-free Taped and reeled, lead-free
Package Information
Package SSO44
Dimensions in mm
18.05 17.80 9.15 8.65 7.50 7.30
2.35 0.3 0.8 16.8 44 23 0.25 0.10
0.25 10.50 10.20
technical drawings according to DIN specifications
1
22
31
4837A-AUDR-10/04
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