AM/FM Receiver U4255BM-M Description U4255BM-M highly integr

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AM/FM Receiver U4255BM-M Description U4255BM-M highly integr

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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
AM/FM Receiver U4255BM-M
Description
U4255BM-M 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 AF-signal processing. Together with U4256BM, automatically aligned high-performance AM/FM tuner built. These dedicated highly sophisticated radio applications.
Preliminary
Configuration
Figure Pinning SSO44
MX1AMA MULTIP IFAGCL IFAGCH MX2OA IF1OUT MX1OB MX1OA IF1REF SMUTE IF1FMI OPLPF IF1AMI MX2OB MX2LO FILADJ MX2IN DATA IF2IN IF2OUT
OSCOUT
OSCB
OSCE
GNDOSC
MX1FMA
MX1FMB
MX1AMB
GNDMX
AMVREG
AMPLPF
FMAGC
AMAGC
METER
ADJAC
Rev. 4519C-AUDR-07/02
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 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, MX1AM MX1AM Multipath detection output mixer input Supply voltage mixer output mixer output
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Figure Block Diagram
AMPLPF MX1OA IF1FMI MX2OB IF1AMI MX1OB IF1REF IF1OUT MX2IN MX2OA AMAGC AMVREG
IF2IN IF2OUT
dem. MX1AMA MX1AMB
OPLPF
GNDMX MX1FMB MX1FMA Automatic adjustment
IFAGCL IFAGCCH
FILADJ
OSCOUT
Divider Adj. chan Bandgap METER MX2LO ADJAC
Multipath Soft mute
GNDOSC OSCE OSCB
Stop
dem.
MULTIP SMUTE
Dev. ana.
DATA FMAGC
Functional Description
U4255BM-M 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, softmute 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. protocol bit-to-register mapping described section '3-wire Description'. meaning control bits mentioned following sections.
Reception Mode
operated four different modes. Mode Standby selected means according Table mode mixer, RF-AGC amplifier activated. input amplifier connected output amplifier demodulator. output demodulator available output
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mode mixer, RF-AGC amplifier activated. bandwidth output tank increased input amplifier switched between 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 Operating Mode
AM/FM/Weather Channel Standby Weather band
Test Mode
special test mode implemented final production test only. This mode activated setting This mode intended used customer application. normal operation, deactivated normal operation mode. Table Test Mode
Mode Normal operation Testmode
oscillator circuit implemented build proposed application schematic. frequency used generate frequency mixer stages. control voltage usually generated circuit U4256BM. 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 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 according Table in-band threshold referred mixer input (Pin depends gain amplifier adjusted
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Table FM-AGC Threshold
FM-AGC Threshold dBmV dBmV dBmV dBmV
Figure RF-AGC
C111 R115
Diode
RF-AGC
RF-AGC controls current into diodes (Pin source drain voltage MOSFET preamplifier stage (Pin limit level mixer input (Pin 41). This threshold level 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 AM-AGC Threshold
AM-AGC Threshold dBmV dBmV dBmV dBmV
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 according Table
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Table Divide Factor Prescaler
Divider Prescaler Divide Divide Divide Divide Divide
Amplifier
programmable gain amplifier used mode between compensate loss external ceramic band filters. gain this amplifier adjusted input output resistance fits external ceramic filters. different temperature coefficients amplifier selected Table Gain Amplifier
Gain
Table Temperature Coefficient Setting Amplifier
Temperature Coefficient (TC) Amplifier TKmin TKmax
Amplifier Mixer
mode, gain amplifier controlled IF-AGC extend control range IF-AGC. 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 Table Mixer Output Resistance Mode
Output Resistance (Bit 0.63 0.47 0.29 Output Resistance (Bit 0.78 0.55 0.32
frequency mixer (10.25 MHz) applied This signal usually generated circuit U4256BM.
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Table Bandwidth Mixer
Mixer
Remark: bandwidth also depending from values application circuit.
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 Table Filter Mode
Filter Internal filter External internal filter
IF-AGC
IF-AGC controls level signal that passed demodulator input integrated bandfilter output
different time constants IF-AGC selected capacitors (IFAGCH) (IFAGCL). short time constant (IFAGCL) used mode search mode. long time constant (IFAGCH) used reception. Table IF-AGC Time Constant
Mode FM/WB reception search Time Constant IFAGCL (fast) IFAGCH (slow) IFAGCL (fast)
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.
Output
after gain-controlled amplifier available Pin20 (Bit mode, this signal used external stereo decoder. Alternatively, signal corresponding logarithmic field strength after integrated band filter, which used multipath detection, switched setting
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Table Output Setting
output Multipath field strength
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 Automatic Center Frequency Adjustment
Automatic Frequency adjustment
10.25MHz
center freq. center freq. 14.17 center freq.
FM-Demod
56.59
FMbandfilter adj.channel Sensor
fine tuning, center frequency these integrated active filters (band filter, demodulator adjacent channel sensor) shifted steps 6.25 means Additionally, center frequency band filter adjusted separately means default setting used. Table 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
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Table Band Filter Center Frequency Correction
Correction 6.25 12.50 18.75 25.00 31.25 37.50 43.75 (default) 6.25 12.50 18.75 25.00 31.25 37.50 43.75
Integrated Band Filter reception band filter with variable bandwidth integrated front
demodulator provide channel selectivity bandwidth this filter adjusted (see Table 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 means (Bit field strength after integrated band filter that available (Bit55 used this purpose. Table Bandwidth Integrated Band Filter.
Bandwidth
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Demodulator
weather band reception, gain demodulator increased adjusted means 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 Figure Demodulator Automatic Fine Tuning
Demod
center freq.
IFAGCH (10nF)
Automatic Frequency adjustment
center frequency demodulator adjusted means center frequency, voltage output equal offset voltage that measured while mute active (Bit This adjustment will affect center frequency integrated filters mentioned before. Table Demodulator Gain Weather Band Mode
Demodulator Gain Weather Band Mode Relative Mode
Table Demodulator Fine Adjustment
Demodulator Fine Adjustment Fine tuning Fine tuning
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Soft Mute
soft mute functionality implemented reduce output level demodulator input signal levels limit noise output this case. 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 maximum value soft mute selected steepness time constant soft mute adjusted resistor capacitor between field strength signal available used soft mute. Therefore, soft mute threshold referred input mixer depends gain from mixer input field strength sensor. Table Soft Mute Threshold
Relative Soft Mute Threshold Soft mute
Table Maximum Soft Mute
Maximum Value Soft Mute
Figure Soft Mute
(Pin9) Gain FM-Demodulator 68.70
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Output
output demodulator mode) output demodulator (FM/WB mode) available output (Pin 11). output signal muted setting bandwidth lowpass filter output means kHz. Table Output Mute
Output out, normal operation Mute
Table Output Bandwidth
Bandwidth Lowpass Filter
Receiving Condition Analyzer
U4255BM-M implements several sensors that provide information about receiving condition selected station.
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 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 Field Strength Selection
Field Strength Narrow Band Wide Band Fieldstrength (wide band) Fieldstrength from IF-AGC (narrow band)
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 kHz. frequency signal measured counting number periods signal during measurement time which determined inverted STOP signal available according Table frequency 10.25 used time reference.
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Table Search Stop Detector Measurement Time
Time Window Stop Signal 3.1969 3.1969
Table Search Stop Window
Search Stop Window
Table Signals Available Digital Output
(AM) (FM/WB) (AM) (FM/WB) (Pin MPINT STOP (STOP MPINT)
Deviation Sensor
deviation sensor active FM/WB mode measures modulation signal. implemented peak detector lowpass-filtered signal (see Figure output voltage proportional frequency deviation FM/WB modulation depth respectively. Figure Deviation Sensor
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Adjacent Channel Sensor
adjacent channel sensor active mode only measures field strength outside reception band. setting center frequency band filter adjacent channel sensor below above frequency (Bit determined whether disturbance signal located above below reception frequency (see Table 28). bandwidth band filter used adjacent channel sensor changed means default bandwidth setting used. output adjacent channel sensor independent bandwidth setting integrated band filter. Figure Adjacent Channel Sensor
intergr. bandfilter
Table Bandwidth Adjacent Channel Detector Filter
Adjustment (default)
Table Center Frequency Adjacent Channel Sensor
Center Frequency Filter
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Table Output Voltage Adjacent Channel Sensor Different Receiving Conditions Center Frequencies
Adjacent Channel Disturbance below above high high high high high high
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 Multipath Sensor
Pin40
Multipath Noise Canceller (MNC) implemented reduce disturbance received signal multipath reception conditions. difference between momentary averaged field strength falls below threshold adjustable (see Table 30), signal muted this situation (MPINT) signalized (INT) according Table Muting signal during multipath disturbances activated setting
Table Multipath Noise Canceller
Multipath Noise Canceller Active active
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Table Sensitivity
Sensitivity (Threshold) (-18 Normal (-12 High
3-wire Description
register settings U4255BM-M 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 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 U4255BM-M compatible addressing used U4256BM. That means U4255BM-M U4256BM operated same 3-wire shown application circuit.
U4255BM-M
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Figure Pulse Diagram
8-bit command
DATA
BYTE
24-bit command
DATA
BYTE BYTE BYTE
Figure Timing
Enable Data tHDA Clock tHEN
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Data Transfer
Table Control Registers
A24_100
ADDR. BYTE Gain amplifier BYTE divider/multipath sensitivity Field stren BYTE
AM/FM/WB
Sear
Width window
Time window stop signal
A24_101
ADDR. BYTE WBDemodGain BYTE mixer BYTE Adj.
Start Smute
TkFM
FM-AGC
AM-AGC
center frequency
A24_111
ADDR. BYTE BYTE BYTE bandwidth adj. channel sensor
used test mode only
center frequency bandfilter
A8_100 ADDR. BYTE Adj. channel sensor
A8_101 ADDR. BYTE Optimi Band width
U4255BM-M
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Absolute Maximum Ratings
voltages referred (Pin
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
Parameters Supply voltage range Ambient temperature Symbol Tamb Min. Typ. Max. Unit
Electrical Characteristics
Test conditions (unless otherwise specified): 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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Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): 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 VS-0.2 dBµV dBmV 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 Supply current Conversion conductance 3rd-order input intercept 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, AC-grounded AC-grounded Generator resistance (Pin VS-0.2 VS-1.7 VS-1.5 dBµV
Mixer, Mode (Bit current Pins IP3AMmix NFAMmix dBµV
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
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Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): Tamb 25°C.
Parameters -order intercept point Noise figure (DSB) Input resistance Input capacitance Maximum differential output vltage Output resistance Minimum voltage gain Temperature coefficient gain Temperature coefficient gain Input resistance Input capacitance Output resistance Maximum voltage gain Gain control range Noise figure Input resistance Input capacitance Output resistance
Test Conditions
Symbol IP3FMmix NFFMmix
Min.
Typ.
Max.
Unit dBmV
Type*
Generator resistance AC-grounded
TKmin TKmax 0.039 0.044
Amplifier, Mode (Bit Bits AC-grounded AC-grounded load dB/K dB/K
Amplifier, Mode (Bit Generator resistance AC-grounded Generator resistance (Pin NFMix2 IP3Mix2 NFIFAM dBµV
Mixer
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
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
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Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): Tamb 25°C.
9.10 9.11 9.12 10.1 10.2 10.3 10.4 10.5 10.6 Parameters Maximum differential output voltage Input resistance input voltage input resistance input bias voltage Amplifier (Bit Input resistance Maximum voltage gain Gain control range Maximum voltage gain output voltage output voltage Unmodulated signal, dBµV active) Small signal Deviation kHz, fmod Deviation kHz, fmod (reference: kHz) Deviation kHz, fmod Dev. 22.5 kHz, fmod kHz, de-emphase, signal input (Pin (Pin Bits 89-91 Bits 68-70 Modulation depth 80%, fmod Modulation depth 80%, fmod kHz, V(Pin const. AC-grounded AM/WB mode (Bit AM/WB mode (Bit mode (Bit
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
Type*
mVpp
mVrms
10.7 11.1 11.2
Output impedance output voltage Stereo roll-off
Demodulator Integrated Bandfilter, Mode (Bit Setting
Filter mVrms
-2.3
-2.0
-1.7
11.3 11.4
Total harmonic distortion Maximum signal-tonoise ratio
THDFM
(S/N)FM
12.1 12.2 12.3 13.1 13.2
Soft Mute, Mode (Bit Mute gain Mute gain Soft mute threshold dBµV
Demodulator, Mode (Bit output voltage Total harmonic distortion mVrms
THDAM
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
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Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): Tamb 25°C.
13.3 Parameters Maximum signal-tonoise ratio Output output voltage Mute gain dev. kHz, fmod Small signal 2.15 2.25 Test Conditions Modulation depth 80%, fmod kHz, dBµV Symbol (S/N)AM Min. Typ. Max. Unit Type*
14.1 14.2
14.3 15.1 15.2 15.3 15.4 16.1 16.2 17.1 17.2
Output resistance saturation voltage output resistance HIGH saturation voltage HIGH output resistance Offset voltage Output voltage
Search Stop Detector, Output 4.75
Deviation Sensor, Mode (Bit dev. dev. kHz, fmod signal Unmodulated signal dBµV dBµV dBµV
Field Strength Sensor, Mode (Bit 89-91 Offset voltage Output voltage 0.75
Field Strength Sensor, Mode (Bit 17.3 17.4 18.1 18.2 Output voltage field strength Output voltage HIGH field strength Offset voltage Output voltage
Multipath Sensor, Mode (Bit Unmodulated signal, dBµV modulation depth 60%, fmod kHz, dBµV Unmodulated signal dev. kHz, fmod
19.1 19.2
Adjacent Channel Sensor, Mode (Bit (Default Setting) Offset voltage Output voltage
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
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Electrical Characteristics (Continued)
Test conditions (unless otherwise specified): Tamb 25°C.
19.3 Parameters Output voltage Test Conditions Desired dev. kHz, fmod undesired: unmodulated level undesired/desired: frequency offset -150 Symbol Min. Typ. Max. Unit Type*
20.1 20.2 20.3 20.4 20.5
3-wire 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
20.6 20.7 20.8 20.9 20.10 21.1 21.2 21.3 21.4
tHEN tHDA
Type means: =100% tested, 100% correlation tested, Characterized samples, Design parameter
U4255BM-M
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Diagrams
following data measured with application board (see Figure 20). measurement setup, 50-W generator terminated connected antenna input 50-W series resistor achieve 75-W termination antenna input. generator level specified output voltage this 50-W generator load. application board replaced 75-W resistor, voltage this resistor below specified voltage level generator.
Figure Demodulator
Integrated bandfilter setting: kHz, Bits modulation frequency; de-emphasis (THD)
+85°C
output voltage Vrms
-40°C
-40°C +85°C
Frequency deviation
Figure Multipath Sensor
modulation frequency kHz; generator level dBmV
Sensor Output Voltage
+85°C +25°C -40°C
Modulation Depth
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Figure Multipath Sensor Frequency Response
Generator level dBmV
+85°C +25°C -40°C
Sensor Output Voltage
1000 10000
+85°C +25°C -40°C
100000
Modulation Frequency (Hz)
Figure Deviation Sensor
modulation frequency: kHz; setting filter
Deviation sensor output voltage
+85°C
-40°C
20000 40000 60000 80000 100000
Frequency deviation (Hz)
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Figure Deviation Sensor Frequency Response
frequency deviation: 22.5
Sensor output voltage
1000 10000 100000
modulation frequency (Hz)
Figure Input Level Sweep
Soft mute threshold Bits soft mute gain gain amplifier Bits
Signal Noise
Sensor output
Input level (dBµV)
Fieldstrength sensor output voltage
output (dB)
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Figure Selectivity
Integrated bandfilter setting: desired signal level adjusted without undesired signal undesired signal level adjusted
Pdes/Pundes
-250
Adjacent
-200
-150
-100
Frequency offset
U4255BM-M
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Adjacent channel output voltage
Pdes/Pundes
U4255BM-M
Figure Test Circuit
Test Point 100p 100n U4256BM Pin15 Pin19 220n 220n Pin1 100n 100n 100n 100n
U4255BM-B
100n 200k 100n
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Figure Application Circuit
R407 KR202 X301 KF302 R305 F201 C206 C205 220n C207 C310 220n 220n C312 R152 C208 C309 F302 C113 100n 100p C204 470n C111 470n R115 R111 200k C202 C307 R303 R106 F201 C201 C209 100n C306 C112 KR201 R304 C308 100n MULTIP (+8,5V.10,5V)
U4255BM-M
U4255BM
R313 R102 C107 D102 R121 BB804 R104 R112 C106 L102 T101 BFR93A F101 BB804 D101 C102 S391D D103 C103 R122 C158 C159 C157 ADJAC C115 100n C116 100n METER R151 C152 330p C117 C104 D131 R131 C134 BB804 C110 F102 C314 C156 C108 C109 F131 C133 DATA C155 100n C153 C154 12p* Q151 12p* 10,25MHz *depends Q151 220n C203 C114 C131 C132 IF2OUT
L302
C319
100uH
R311
R105
L303
T102 BC858
T302 BC848
C316
R308
T301
220n
858C
R306 470k
T111 J109
R307
C315
C302
220n
U4256BM
C151 DAC3 SWO1 SWO3 SWO2 SWO4
L301
D301
R103
S391D
D302
C311
S391D
100n
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U4255BM-M
Ordering Information
Extended Type Number U4255BM-MFN U4255BM-MFNG3 Package SSO44 SSO44 Remarks Tube Taped reeled
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
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4519C-AUDR-07/02

AM/FM Receiver U4255BM-M Description U4255BM-M highly integr

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