AM/FM Receiver ATR4255P Electrostatic sensitive device. Observe p

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AM/FM Receiver ATR4255P Electrostatic sensitive device. Observe p

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Double-conversion System Integrated Second Filter with Software-controlled Bandwidth Completely Integrated Demodulator Soft Mute Multipath Noise Cancellation Receiving Condition Analyzer Up/Down-conversion System Preamplifier with Stereo Capability 3-wire Controlled Search Stop Signal Generation Automatic Alignment Possible Lead-free Package
AM/FM Receiver ATR4255P
Electrostatic sensitive device. Observe precautions handling.
Description
ATR4255P highly integrated AM/FM front-end circuit manufactured using Atmel's advanced BiCMOS technology. represents complete, automatically adjustable AM/FM front end, containing double-conversion system up/down-conversion receiver with 10.7 kHz. front suitable digital analog signal processing. Together with ATR4256, automatically aligned high-performance AM/FM tuner built. These designed highly sophisticated radio applications.
Rev. 4883B-AUDR-01/06
Figure 1-1.
Block Diagram
AMPLPF MX1OA IF1FMI MX2OB IF1AMI IF2IN MX1OB IF1REF IF1OUT MX2IN MX2OA IF2OUT
AMAGC AMVREG
dem.
MX1AMA MX1AMB
OPLPF
IFAGCL IFAGCH
GNDMX MX1FMB MX1FMA
Automatic adjustment
FILADJ
OSCOUT
Divider Adjacent channel Band MX2LO ADJAC
Multipath Soft mute
GNDOSC OSCE OSCB
Stop
dem.
MULTIP SMUTE
Dev. analog
DATA FMAGC METER
ATR4255P
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ATR4255P
Configuration
Figure 2-1. Pinning SSO44
MX1FMA MX1FMB MX1AMB GNDMX FMAGC AMVREG AMAGC AMPLPF METER MX1OB MX1OA MX1AMA MULTIP IF1REF IF1FMI FILADJ IFAGCL IFAGCH SMUTE IF1AMI OPLPF IF1OUT IF2IN MX2IN MX2OA MX2OB
ADJAC OSCB OSCE GNDOSC OSCOUT DATA IF2OUT
MX2LO
4883B-AUDR-01/06
Table 2-1.
Description
Symbol MX1FMA MX1FMB MX1AMB GNDMX FMAGC AMVREG AMAGC AMPLPF METER ADJAC OSCB OSCE GNDOSC OSCOUT DATA IF2OUT MX2LO MX2OB MX2OA MX2IN IF2IN IF1OUT OPLPF IF1AMI SMUTE IFAGCH IFAGCL FILADJ IF1FMI IF1REF MULTIP MX1AMA MX1OA MX1OB Function mixer input mixer input mixer input Ground mixer, preamplifier preamplifier control voltage preamplifier filter Field strength output Adjacent channel detection output Multiplex signal 5.7V reference voltage Oscillator basis Oscillator emitter Oscillator ground Oscillator output 3-wire enable 3-wire clock 3-wire data amplifier output Interrupt, stop signal 10.25 input mixer mixer output mixer output Ground mixer input reference AMPIN, AMIFAGC, Control, IF2IN amplifier input reference IF1OUT, MX2IN amplifier output Deviation detect output, test output Operating point amplifier input Soft mute control input filter high time filter time constant Filter adjust amplifier input MX1OUT reference, MX1AMA, MX1AMB Multipath detection output mixer input Supply voltage mixer output mixer output
ATR4255P
4883B-AUDR-01/06
ATR4255P
Functional Description
ATR4255P implements up/down-conversion reception path from input signal AM-demodulated audio frequency output signal, reception, double-conversion reception path from input signal FM-demodulated multiplex signal (MPX). prescaler integrated generate frequency mixer. Automatic gain control (AGC) circuits implemented control preamplifier stages reception path. improved performance, integrated filter with adjustable bandwidth, soft mute feature, automatic multipath noise cancellation (MNC) circuit fully integrated. powerful sensors provided receiving condition analysis stop signal generation. Several register bits (bit used control circuit operation adapt certain circuit parameters specific application. control bits organized 8-bit three 24-bit registers that programmed 3-wire protocol. Section "3-wire Description" page protocol bit-to-register mapping. meaning control bits described following sections.
Reception Mode
operated four different modes; modes Weather band (WB), Standby selected means bits shown Table 3-1. mode, mixer, RF-AGC amplifier activated. input amplifier connected output amplifier demodulator. output demodulator available output mode, mixer, RF-AGC amplifier activated. bandwidth output tank pins increased input amplifier switched between pins output amplifier integrated bandfilter demodulator. output demodulator available output, mode similar mode, input amplifier fixed range bandwidth control integrated band filter shifted lower bandwidth, gain demodulator increased. Standby mode, mixers, amplifiers circuits deactivated reduce current consumption.
Table 3-1.
Operating Mode
AM/FM/Weather Channel Standby Weather band (WB)
4883B-AUDR-01/06
Test Mode
special test mode implemented final production test only. This mode activated setting "1". This mode intended used customer applications. normal operation, "0". Bits deactivated normal operation mode.
Table 3-2.
Test Mode
Mode Normal operation Test mode
oscillator circuit implemented build proposed application schematic. frequency used generate frequency mixer stages. control voltage usually generated circuit ATR4256. signal provided buffered output circuit.
RF-AGC
RF-AGC circuit includes wideband level detector input, mixer, in-band level detector output amplifier (pin 30). outputs these level detectors used control current into diode (see Figure 3-1) order limit signal level mixer input following stages. maximum diode current determined R115 time constant control loop adjusted changing value C111. threshold level input mixer adjusted bits shown Table 3-3. in-band threshold referred mixer input (pin depends gain amplifier adjusted using bits Figure 3-1. RF-AGC
C111 R115
Diode
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ATR4255P
Table 3-3. FM-AGC Threshold
FM-AGC Threshold dBµV dBµV dBµV dBµV
RF-AGC
RF-AGC controls current into diodes (pin source drain voltage MOSFET preamplifier stage (pin limit level mixer inputs (pin 41). This threshold level bits (Table 3-4). level mixer input exceeds selected threshold, current into diodes increased. this step sufficient, source drain voltage MOSFET decreased. time constant control loop adjusted changing value capacitor
Table 3-4.
AM-AGC Threshold
AM-AGC Threshold dBµV dBµV dBµV dBµV
Mixer
mixer stage, reception frequency down converted frequency. frequency used frequency mixer.
Mixer
mixer used up-conversion reception frequency frequency. Therefore, prescaler implemented generate necessary frequency from frequency. divide factor prescaler selected shown Table 3-5.
Table 3-5.
Divide Factor Prescaler
Divider Prescaler Divide Divide Divide Divide Divide
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Amplifier
programmable gain amplifier used mode between compensate loss external ceramic band filters. gain this amplifier adjusted bits (Table 3-6). input output resistance 330, fits external ceramic filters. different temperature coefficients (TC) amplifier selected setting (Table 3-7).
Table 3-6.
Gain Amplifier
Gain
Table 3-7.
Temperature Coefficient Setting Amplifier
Temperature Coefficient (TC) Amplifier TKmin TKmax
Amplifier
mode, gain amplifier controlled IF-AGC extend control range IF-AGC.
3.10
Mixer
mixer used mode. mixer input input resistance connected directly external ceramic filter. mode, high output resistance second mixer reduced increase bandwidth tank mixer output. output resistance selected bits (Table 3-8). Table 3-8.
Mixer Output Resistance Mode
Output Resistance (Bit 0.63 0.47 0.29 Output Resistance (Bit ~100 0.78 0.55 0.32
frequency mixer (10.25 MHz) applied This signal usually generated circuit ATR4256.
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ATR4255P
Table 3-9.
Note:
Bandwidth (BW) Mixer
Mixer
bandwidth also depends values application circuit.
3.11
Amplifier
mode, input second amplifier which externally connected mixer tank through ceramic filter achieve channel selectivity. During normal operation (bit input second amplifier connected mixer output (pin integrated band filter used channel selectivity only. possible additional external filter between mixer tank mode setting "1". Filter Mode
Filter Internal filter External internal filter
Table 3-10.
3.12
IF-AGC
IF-AGC controls level signal that passed demodulator input integrated bandfilter, output (pin 20). different time constants IF-AGC selected capacitors (IFAGCH) (IFAGCL). short time constant (IFAGCL) used mode search mode. long time constant (IFAGCH) used reception.
Table 3-11.
IF-AGC Time Constant
Time Constant IFAGCL (fast) IFAGCH (slow) IFAGCL (fast)
Mode FM/WB reception search
FM/WB mode, output signal demodulator applied series resistor about This low-pass filtered output signal demodulator used demodulator fine adjustment, muting reference deviation sensor.
4883B-AUDR-01/06
3.13
Output
after gain-controlled amplifier available (bit mode, this signal used external stereo decoder. Alternatively, signal corresponding logarithmic field strength after integrated band filter, which used multipath detection, switched setting "1".
Table 3-12.
Output Setting
output Multipath field strength
3.14
Automatic Center Frequency Adjustment
Integrated active filters used band filter, demodulator, adjacent channel sensor. center frequency these filters automatically adjusted second frequency kHz. frequency 10.25 used reference this alignment. Figure 3-2. Automatic Center Frequency Adjustment
Automatic frequency adjustment
10.25
Center freq. Center freq. Center freq.
demod.
band filter Adj. channel sensor
Bits
fine tuning, center frequency these integrated active filters (band filter, demodulator, adjacent channel sensor) shifted steps 6.25 using bits (Table 3-13 page 11). Additionally, center frequency band filter adjusted separately means bits "1". "0", default setting used.
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Table 3-13.
Center Frequency
Center 450.00 456.25 461.50 468.75 475.00 481.25 487.50 493.75 450.00 443.75 437.50 431.25 425.00 418.75 412.50 406.25
Table 3-14.
Band Filter Center Frequency Correction
-6.25 -12.50 -18.75 -25.00 -31.25 -37.50 -43.75
Correction
(default) +6.25 +12.50 +18.75 +25.00 +31.25 +37.50 +43.75
4883B-AUDR-01/06
3.15
Integrated Band Filter
reception, band filter with variable bandwidth integrated front demodulator provide channel selectivity bandwidth this filter adjusted using bits (Table 3-15) suitable present receiving condition. mode, bandwidth integrated filter shifted lower bandwidth values, while necessary channel selectivity achieved external ceramic filter. center frequency integrated band filter adjusted using bits (bit "1"). field strength after integrated band filter that available (bit "1") used this purpose.
Table 3-15.
Bandwidth Integrated Band Filter
Bandwidth
3.16
Demodulator
weather band reception, gain demodulator increased adjusted means bits (Table 3-16 page order increase output voltage compensate frequency deviation weather band. integrated demodulator fine adjustment allows automatic fine tuning demodulator center frequency average frequency received signal. This feature implemented weather band mode, activated setting "0".
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ATR4255P
Figure 3-3. Demodulator Automatic Fine Tuning
demod.
Center freq.
IFAGCH
Automatic frequency adjustment
center frequency demodulator adjusted means bits center frequency, voltage output equal offset voltage that measured while mute active (bit This adjustment will affect center frequency integrated filters mentioned before.
Table 3-16.
Demodulator Gain Weather Band Mode
Demodulator Gain Weather Band Mode Relative Mode
Table 3-17.
Demodulator Fine Adjustment
Demodulator Fine Adjustment Fine tuning Fine tuning
3.17
Soft Mute
soft mute functionality implemented reduce output level demodulator input signal levels, limit noise output input signal levels. input level falls below adjustable threshold, continuously output demodulator continuously muted with decreasing input level until maximum mute value reached. threshold start soft mute maximum mute adjusted. signal level mute means bits maximum value soft mute selected steepness time constant soft mute adjusted resistor capacitor between pins field strength signal available used soft mute. Therefore, soft mute threshold referred input mixer depends gain from mixer input field strength sensor.
4883B-AUDR-01/06
Table 3-18.
Soft Mute Threshold
Relative Soft Mute Threshold Soft mute
Table 3-19.
Maximum Soft Mute
Maximum Value Soft Mute
Figure 3-4.
Soft Mute
(Pin
Gain demodulator Bits
3.18
Output
output demodulator mode) output demodulator (FM/WB mode) available output (pin 11). output signal muted setting (Table 3-20). bandwidth low-pass filter output using (Table 3-21 page 15).
Table 3-20.
Output Mute
Output
out, normal operation Mute
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ATR4255P
Table 3-21. Output Bandwidth
Bandwidth Low-pass Filter
3.19
Receiving Condition Analyzer
ATR4255P implements several sensors that provide information about receiving condition selected station.
3.20
Field Strength Sensor
field strength sensor provides voltage which represents logarithmic field strength signal reception band. field strength information retrieved either from level detector input mixer (pin from IF-AGC depending setting bandwidth field strength detection smaller than when using level detector because additional selectivity between mixer amplifier particularly field strength detection limited range. Usually field strength from level detector used mode field strength used mode.
Table 3-22.
Field Strength Selection
Field Strength Narrow Band/Wide Band Field strength (wide band) Field strength from IF-AGC (narrow band)
3.21
Search Stop Detector
search stop detector available FM/WB mode. STOP condition signaled frequency signal within window around center frequency kHz. width this search stop window range using bits frequency signal measured counting number periods signal during measurement time which determined value bits inverted STOP signal available shown Table 3-25 page frequency 10.25 used time reference.
Table 3-23.
Search Stop Detector Measurement Time
3.1969 3.1969
Time Window Stop Signal
4883B-AUDR-01/06
Table 3-24.
Search Stop Window
Search Stop Window ±0.5 ±1.1 ±2.3 ±4.8
Table 3-25.
Signals Available Digital Output
(AM) (FM/WB) (AM) (FM/WB) (Pin MPINT STOP (STOP MPINT)
3.22
Deviation Sensor
deviation sensor active FM/WB mode measures modulation signal. implemented peak detector low-pass-filtered signal (see Figure 3-5). output voltage proportional frequency deviation FM/WB modulation depth Figure 3-5. Deviation Sensor
3.23
Adjacent Channel Sensor
adjacent channel sensor active only mode, measures field strength outside reception band. setting center frequency band filter adjacent channel sensor below above frequency (bits determined whether disturbance signal located above below reception frequency (see Table 3-28 page 18). bandwidth band filter used adjacent channel sensor changed means bits default bandwidth setting used. output adjacent channel sensor independent bandwidth setting integrated band filter.
ATR4255P
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ATR4255P
Figure 3-6. Adjacent Channel Sensor
Intergrated band filter
Table 3-26.
Bandwidth (BW) Adjacent Channel Detector Filter
Adjustment (default)
Table 3-27.
Center Frequency Adjacent Channel Sensor
Center Frequency Filter
4883B-AUDR-01/06
Table 3-28.
Output Voltage Adjacent Channel Sensor Different Receiving Conditions Center Frequencies
High High High High High High
Adjacent Channel Disturbance Below Above
3.24
Multipath Sensor
multipath sensor active mode only measures disturbance multipath reception. multipath sensor detects drops field strength after integrated band filter calculating difference between averaged maximum field strength current field strength. maximum depth these drops represented voltage peak detector (MULTIP). level this voltage represents degree disturbance received signal. Figure 3-7. Multipath Sensor
multipath noise canceller (MNC) implemented reduce disturbance received signal multipath reception conditions. difference between momentary averaged field strength falls below adjustable threshold (adjustable setting bits Table 3-30 page 19), signal muted this situation (MPINT) signaled (INT) shown Table 3-25 page Muting signal during multipath disturbances activated setting (Table 3-29).
Table 3-29.
Multipath Noise Canceller
Multipath Noise Canceller Active active
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ATR4255P
Table 3-30. Sensitivity
Sensitivity (Threshold) (-18 Normal (-12 High
3.25
3-wire Description
register settings ATR4255P programmed 3-wire protocol. protocol consists separate commands. defined number bits transmitted sequentially during each command. command used program bits register. different registers available (see Table 3-31 page addressed length command (number transmitted bits) three address bits that unique each register given length. 8-bit registers programmed 8-bit commands 24-bit registers programmed 24-bit commands. Each command starts with rising edge enable line (EN) ends with falling edge kept HIGH during command. sequence transmitted bits during command starts with first byte ends with last byte register addressed. DATA evaluated rising edges CLK. number HIGH transitions during HIGH period used determine length command. protocol register addressing ATR4255P compatible addressing used ATR4256. That means ATR4255P ATR4256 operated same 3-wire shown application circuit.
4883B-AUDR-01/06
Figure 3-8.
Pulse Diagram
8-bit command
DATA BYTE
24-bit command
DATA BYTE BYTE BYTE
Figure 3-9.
Timing
Enable Data tHDA Clock tHEN
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ATR4255P
3.26 Data Transfer
Control Registers
BYTE AM/FM/ Gain amplifier BYTE BYTE Time window stop signal
Table 3-31.
A24_100 ADDR.
divider/multipath Field Search Width window sensitivity strength
A24_101 ADDR. BYTE WBDemodGain Start soft mute Soft mute BYTE Tk-FM FM-AGC AM-AGC mixer BYTE Dem. Adj. used
center frequency
A24_111 ADDR. BYTE Used test mode only BYTE BYTE Center frequency bandfilter Bandwidth adj. channel sensor
A8_100 ADDR. BYTE Test MPoff Mute Adj. channel sensor
A8_101 ADDR. BYTE Optimize Bandwidth
4883B-AUDR-01/06
Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. This stress rating only functional operation device these other conditions beyond those indicated operational sections this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability. voltages refer (pin 25). Parameters Supply voltage, Power dissipation Junction temperature Ambient temperature range Storage temperature range Symbol Ptot Tamb Tstg Value 1000 +150 Unit
Thermal Resistance
Parameters Junction ambient, soldered Symbol RthJA Value Unit
Operating Range
voltages referred (pin 25). Parameters Supply voltage range, Ambient temperature Symbol Tamb Min. Typ. Max. Unit
Electrical Characteristics
Test conditions (unless otherwise specified): 8.5V, Tamb 25°C. Parameters Power Supply Supply voltage Supply current Supply current Frequency range bias voltage Buffer output voltage Buffer output resistance Buffer output voltage fosc fVCO mVrms Standby mode (bit Other operation modes IStby Test Conditions Symbol Min. Typ. Max. Unit Type*
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
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ATR4255P
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): 8.5V, Tamb 25°C. Parameters RF-AGC Saturation voltage Saturation voltage Threshold level Maximum threshold level input signal input signal In-band signal Out-of-band signal (110 MHz), input signal input signal V(pin V(pin V(pin Bits dBµV dBµV Test Conditions Symbol Min. Typ. Max. Unit Type*
RF-AGC, Mode (Bit Saturation voltage Saturation voltage Output voltage minimum gain Output voltage minimum gain Maximum control voltage Maximum control voltage Minimum control voltage Minimum threshold level dBµV
Mixer, Mode (Bit Supply current Conversion conductance 3rd-order input intercept grounded point Noise figure (SSB) Input bias voltage Input resistance Input capacitance Maximum output voltage Output resistance Mixer Mode (Bit Supply current Conversion conductance current pins 17.5 Differential Single-ended, grounded Generator resistance (pin current pins IP3AMmix NFAMmix dBµV
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
4883B-AUDR-01/06
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): 8.5V, Tamb 25°C. 9.10 Parameters -order intercept point Noise figure (DSB) Input resistance Input capacitance Maximum differential output voltage Output resistance
Test Conditions Generator resistance grounded 8.5V
Symbol IP3FMmix NFFMmix
Min.
Typ.
Max.
Unit dBµV
Type*
TKmin TKmax 0.039 0.044
Amplifier, Mode (Bit Minimum voltage gain Bits dB/K dB/K NFMix2 IP3Mix2 dBµV mVpp Temperature coefficient gain Temperature coefficient gain Input resistance Input capacitance Output resistance
grounded grounded
Amplifier, Mode (Bit Maximum voltage gain Gain control range Noise figure Input resistance Input capacitance Output resistance
load Generator resistance
NFIFAM
grounded
Mixer Generator resistance (pin 8.5V
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 Maximum differential output voltage Input resistance input voltage
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
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ATR4255P
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): 8.5V, Tamb 25°C. 9.11 9.12 10.1 10.2 10.3 10.4 10.5 10.6 10.7 11.1 Parameters input resistance input bias voltage Amplifier (Bit Input resistance Maximum voltage gain Gain control range Maximum voltage gain output voltage output voltage Output impedance Unmodulated signal, dBµV active) Small signal Deviation kHz, fmod Deviation kHz, fmod (reference: kHz) Deviation kHz, fmod Dev. ±22.5 kHz, fmod kHz, deemphasize, signal input (pin (pin Bits Bits Modulation depth 80%, fmod Modulation depth 80%, fmod kHz, V(pin const. Modulation depth 80%, fmod kHz, dBµV grounded AM/WB mode (bit AM/WB mode (bit mode (bit
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
Type*
mVrms
Demodulator Integrated Bandfilter, Mode (Bit Setting output voltage
Filter mVrms
11.2
Stereo roll-off Total harmonic distortion Maximum signal-to-noise ratio (SNR)
-2.3
-2.0
-1.7
11.3
THDFM
11.4
(S/N)FM
12.1 12.2 12.3 13.1
Soft Mute, Mode (Bit Mute gain Mute gain Soft mute threshold dBµV
Demodulator, Mode (Bit output voltage Total harmonic distortion Maximum signal-to-noise ratio (SNR) mVrms
13.2
THDAM
13.3
(S/N)AM
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
4883B-AUDR-01/06
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): 8.5V, Tamb 25°C. 14.1 14.2 14.3 15.1 15.2 15.3 15.4 16.1 16.2 17.1 17.2 Parameters Output output voltage Mute gain Output resistance saturation voltage output resistance HIGH saturation voltage HIGH output resistance Deviation Sensor, Mode (Bit Offset voltage Output voltage dev. dev. kHz, fmod signal Unmodulated signal dBµV dev. kHz, fmod Small signal 2.15 2.25 4.75 Test Conditions Symbol Min. Typ. Max. Unit Type*
Search Stop Detector, Output
Field Strength Sensor, Mode (Bit Bits Offset voltage Output voltage 0.75
Field Strength Sensor, Mode (Bit 17.3 17.4 18.1 Output voltage field strength Output voltage HIGH field strength dBµV dBµV
Multipath Sensor, Mode (Bit Offset voltage Unmodulated signal, dBµV modulation depth 60%, fmod kHz, dBµV Unmodulated signal dev. kHz, fmod Desired dev. kHz, fmod Undesired: unmodulated level Undesired/desired: frequency offset -150
18.2
Output voltage
19.1 19.2
Adjacent Channel Sensor, Mode (Bit (Default Setting) Offset voltage Output voltage
19.3
Output voltage
3-wire
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
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ATR4255P
Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): 8.5V, Tamb 25°C. 20.1 20.2 20.3 20.4 20.5 Parameters Input voltage Input voltage HIGH Leakage current Clock frequency Period HIGH Rise time DATA, Fall time DATA, Set-up time Hold time Hold time DATA Internally Generated Reference Voltages Output voltage Output voltage Output voltage Output voltage Test Conditions tHEN tHDA Symbol Min. Typ. Max. Unit Type*
20.6 20.7 20.8 20.9 20.10 21.1 21.2 21.3 21.4
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
4883B-AUDR-01/06
Diagrams
following data measured with application board (Figure page 32). measurement setup, generator terminated connected antenna input series resistor achieve termination antenna input. generator level specified output voltage this generator load. application board replaced resistor, voltage this resistor below specified voltage level generator. Figure 8-1. Demodulator
+85°C +85°C -40°C -40°C
Output Voltage (Vrms)
Frequency Deviation (kHz)
Note:
Integrated bandfilter setting: kHz, bits modulation frequency; de-emphasis (THD).
Figure 8-2.
Multipath Sensor
Sensor Output Voltage
+85°C +25°C -40°C
Modulation Depth
Note:
modulation frequency kHz; generator level dBµV.
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Figure 8-3. Multipath Sensor Frequency Response
+85°C +25°C -40°C
Sensor Output Voltage
1000 10000
+85°C +25°C -40°C
100000
Modulation Frequency (Hz)
Note:
Generator level dBµV.
Figure 8-4.
Deviation Sensor
Deviation Sensor Output Voltage
+85°C
-40°C
20000 40000 60000 80000 100000
Frequency Deviation (Hz)
Note:
modulation frequency: kHz; setting filter kHz.
Figure 8-5.
Deviation Sensor Frequency Response
Sensor Output Voltage
1000 10000 100000
Modulation Frequency (Hz)
Note:
frequency deviation: 22.5 kHz.
4883B-AUDR-01/06
Figure 8-6.
Input Level Sweep
Signal Noise
Output (dB)
Sensor output
Input Level (dBµV)
Note:
Soft mute threshold, bits soft mute gain, gain amplifier, bits
Figure 8-7.
Selectivity
Pdes/Pundes
Pdes/Pundes (dB)
-250
Adjacent
-200
-150
-100
Frequency Offset (kHz)
Note:
Integrated bandfilter setting: Desired signal level adjusted without undesired signal, undesired signal level adjusted SNR.
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Adjacent Channel Output Voltage
Field Strength Sensor Output Voltage
ATR4255P
Figure 8-8. Test Circuit
Test Point 100p 100n 100n 100n 100n 100n
ATR4255P
100n
200k 100n 220n 220n
Pin19
Pin1
ATR4256 Pin15
4883B-AUDR-01/06
Figure 8-9.
R407 (+8.5V 10.5V) MULTIP
KR202 X301 KF302 R305 F201 C307 C206 C205 220n C207 C310 220n 220n C312 R152 C208 C309 F302 100p C204 470n C111 470n R115 R111 200k C202 C113 100n R303 F201 C201 C209 100n C306 C112 KR201 R304 C308 100n
R106
ATR4255P
Application Circuit
ATR4255P
R313 220n C108 C109 F131 C314 C110 BB804 R121 D131 R131 C104 T101 BFR93A F101 BB804 R122 D101 C102 S391D D103 C103 C159 C158 C157 ADJAC C115 100n C116 100n METER R151 C152 330p C151 DAC3 SWO1 SWO3 SWO2 SWO4 C106 L102 C117 C134 C156 C107 D102 BB804 R104 R112 C133 DATA C155 100n C153 C154 12p* Q151 12p* 10.25 *depends Q151 C203 C114 C131 C132 IF2OUT R102 F102
L302
C319
R311
R105
L303
T102 BC858
T302 BC848
C316
R308
T301
220n
858C
R306 470k
T111 J109
R307
C315
C302
220n
ATR4256
L301
D301
R103
S391D
D302
C311
S391D
100n
4883B-AUDR-01/06
ATR4255P
Ordering Information
Extended Type Number ATR4255P-ILSY ATR4255P-ILQY Package SSO44 SSO44 Remarks Tube, lead-free Taped reeled, lead-free
Package Information
Package SSO44
Dimensions
18.05 17.80 9.15 8.65 7.50 7.30
2.35 16.8 0.25 0.10
0.25 10.50 10.20
technical drawings according specifications
4883B-AUDR-01/06
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4883B-AUDR-01/06

AM/FM Receiver ATR4255P Electrostatic sensitive device. Observe p

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