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TUA4300G
One Chip car radio, AM/FM Receiver
FS: 04/93
ONE CHIP CAR RADIO
Differences to the last editionPage1
Table of ContentsPage2
Functional Description, ApplicationPage3 ... 4
Circuit DescriptionPage5 ... 6
Block DiagramPage7 ... 10
Pin AssignmentPage11
Pin DescriptionPage12 ...13
Package OutlinePage14
Absolute Maximum RatingsPage15
Operational RangePage16
AC / DC CharacteristicsPage17 ... 30
Test CircuitPage31 ... 32
Application CircuitPage33 ... 34
DiagramsPage35 ... 38
AppendixPage39
FS: 04/93
General Description
The TUA 4300 G is a one chip car radio system consisting of AM/FM receiver, AM-Up/Down conversion, AGC amplifier
/ demodulator, FM-IF limiter amplifier / demodulator and stereodecoder / noiseblanker.
1. AM/FM-Receiver
The TUA 4300 G is an integrated combined AM-FM-receiver with strictly symmetrical RF parts for use in car radios.
FeaturesHigh flexibility with an external preamplifier stage for AM and FMStrictly symmetrical RF partsSeparate mixers for AM and FM modeSym. or asym. mixer inputsOnly one 2-pin-oscillator for the 1st LO (in AM mode the oscillator frequency is divided by 8 or 10)1st LO with LC-tank circuit1st LO at 100 MHz range1st LO decoupled counter output1st LO decoupled divided counter outputLow phase noiseFM/AM field strength output combined
2. FM Mode
A. FM-Receiver
In this mode, the receiverpart is comprised of a mixer, an oscillator, a prestage control and an IF post amplification.
FeaturesIntegrated AGC generation for PIN Diodes and MOSFETsHigh level mixer inputHigh input/output 3.order interceptpoint
B. FM-IF Demodulator
The FM-IF-demodulator has been developed especially for car radio applications.
Features
- 7stage limiter amplifier
- Coincidence demodulator
- Field strength output (combined with AM)
- Fixed mute depth (with full muting typ 80dB)
- Multipath detector with analog output
FS: 04/93
3. Stereodecoder
This part provides the stereo decoder function and noise blanking for FM car radio applications.
Features
- Internal reference voltage source
- Adjustment free oscillator with ceramic resonator 456 kHz
- Pilot dependent mono/stereo switching with hysteresis
- Stereo indicator output
- Analog mono/stereo blend control (stereo noise control, SNC)
- Pilot canceller (19 kHz)
- Adjacent channel noise suppression (114 kHz)
- Mute facility
- Analog deemphasis control (high cut control, HCC)
- Interference noise detector with integrated high-pass filter (IF level signal or MPX input)
- MPX-input low-pass filter
- Noise blanking at MPX -demodulator outputs.
- L, R audio is common to AM.
4. AM Mode
In this mode, the IC is comprised of a mixer, an oscillator with a divider by 8 or 10, a prestage control, an IF post
amplification, 2nd mixer with AGC to convert the 1st IF to the 2nd IF, 2nd local oscillator ( buffer for external source),
automatic gain controlled amplifier and quasisynchronous demodulator.
The same oscillator is used in AM and FM mode.
Features2nd mixer with AGC1st IF amp; use of CER filter or crystal filter possible2nd LO with quartz or external sourceOutput for AM IF counterWide range 2nd IF AGC amplifierQuasi synchronous demodulator for AM modeFast AM search tuning stop featureHCC for AM
FS: 04/93
1. AM/FM-Receiver
The AM/FM-receiver part includes a 2-pin varactor tuned oscillator. In the FM mode the direct oscillator frequency is
fed into the double balanced FM mixer, in the AM mode the divided by 8 or 10 oscillator frequency is fed into the AM
mixer.
The two separate symmetrical input stages of the IC, one optimized for FM-, the other for AM- mode allow symmetrical
and unsymmetrical prestage configuration.
The AM and FM input frequencies are converted to a fix 1st IF in the 10.7 MHz range. The IF is post amplified in
separate IF amplifiers, one optimized for FM, the other for AM. Using of a CER filter or crystal filter is possible.
The TUA 4300 G has been designed to work with a PLL in the 100MHz range in both modes or in the AM- mode with
the divided frequency.
Depending on the input signal strength, the integrated AGC stage for prestage control drives PIN-Diodes as well as
MOSFETs.
2. FM-MODE
A. FM-IF Demodulator
The FM-IF amplifier includes a 7 stage capacitive coupled limiter amplifier with coincidence demodulator and AF
output. The AF output signal can be continuously attenuated to decrease the noise.
There is a field strength output (with min. 76 dB dynamic range, typ. ±1 dB nonlinearity and typ. ±3 dB temperature
drift) and a fixed muting (with full muting typ 80 dB).
A multipath detector with analog output is available. Its input signal is fed from the high pass filter of the stereo-
decoder/noiseblanker and a second 80 kHz 1-pole high pass filter.
3. Stereodecoder
Power supply, reference current:temperature-stable, low noise reference voltage generator is used for better ripple rejection and to generate a
reference current. This current is used as a time base for the deemphasis, the gate time of the pulse former, and the
pilot cancellation, avoiding temperature and tolerance effects .
MPX input, MPX filter:
A 4-pole low-pass filter determines the bandwidth of the MPX signal.
Voltage Controlled Oscillator, Phase Detector:
The 456 kHz oscillator and the frequency dividers are used as walsh function generators (suppression of 3rd
order harmonics) for:38 kHz for the stereo decoder
19 kHz inphase for phase detector and pilot cancellation
19 kHz quadrature for the phase detector.
The phase detector locks the on chip 19 kHz signal to the pilot tone in the MPX signal at 90 deg phase.
Pilot Detector, Pilot Indicator, Pilot Cancellation:
The voltage at the pilot detector output is proportional to the pilot tone input level. If that level is high enough, the pilot
indicator output is activated and the pilot cancellation turned on: a 19 kHz signal proportional to the voltage at the pilot
detector output is added to the MPX signal with inverse polarity, cancelling the 19 kHz pilot tone.
Interference Detector , Noise Detector, Pulse Former:
The signal from the interference input (MPX or field strength signal) passes a 4-pole high-pass filter to the noise
blanking circuitry. The average noise level is stored in an external capacitor. The interference detector compares the
actual noise level with that stored in the capacitor and triggers the pulse former if there is a significant difference. The
pulse former generates a gate pulse for the HCC block. During that pulse time the outputs of the deemphasis circuit
are switched to hold mode.
FS: 04/93
3. AM - MODE
In the AM mode the 1st IF is converted by the 2nd mixer into the 2nd IF in the 450 kHz range. Therefore a 2nd LO,
which is used with quartz or as input for external sources, is part of the IC. An AGC in this mixer increases
sensitivity. The 2nd IF signal passes an automatic gain controlled IF amplifier and is then demodulated to the AF
in a quasisynchronous demodulator. Switching to seek mode, the AGC time constant is reduced by a factor of 5,
the 2nd mixer AGC is forced to high gain, the AM IF counter output is switched on and the AF is muted. The AGC
voltage is used as AM field strength and is fed to the combined field strength output.

FS: 04/93
FS: 04/93Multipath detector rectifier capacitorAnalog multipath detector outputAM seek mode switch; AM IF counter on, 2nd mixer gain high,
AM-AGC fast and AM AF muteAM-IF counter output for search tuning Ground IF and stereodecoder sectionFM limiter input bias decoupling capacitorFM limiter inputAM AGC amplifier bias decoupling capacitorAM AGC amplifier input
10)AM AGC amplifier bias decoupling capacitor
11)2nd AM mixer outputs (open collector)
12)2nd AM mixer outputs (open collector)
13)AM AGC amplifier time constant capacitor
14)Oscillator input for 2nd AM mixer
15) Oscillator input for 2nd AM mixer
16)2nd AM mixer bias decoupling capacitor
17)2nd AM mixer input
18)10.7 MHz IF amplifier output AM (open collector)
19)10.7 MHz IFamplifier output FM
20)AM prestage AGC buffered voltage output with fast attack, slow decay feature
21)FM prestage AGC current output for PIN diode
22)10.7 MHz IF amplifier operation point
23)10.7 MHz IF amplifier input AM
24)AM 1st local oscillator divider control for dividing by 10 for long wave and
medium wave receiving or dividing by 8 for short wave receiving
25)Supply voltage RF section
26)Ground RF section
27)FM mixer outputs (open collector)
28)FM mixer outputs (open collector)
29)AM mixer outputs (open collector)
30)AM mixer outputs (open collector)
31)AM prestage AGC time constant capacitor
32)FM prestage AGC time constant capacitor; output for MOS FET Gate 2
33)AM 1st mixer symmetrical inputs
FS: 04/93
34)AM 1st mixer symmetrical inputs
35)FM 1st mixer symmetrical inputs
36)FM 1st mixer symmetrical inputs
37)Reference voltage RF section (4.8 V)
38)1st local AM/FM oscillator circuit
39)1st local AM/FM oscillator circuit
40)1st local oscillator divided by 8/10 counter output (disabled in FM mode)
41)1st local oscillator counter output
42)2nd AM mixer AGC time constant capacitor
43)Timing capacitor for Noisedetector monoflop (gate time)
AM/FM mode control; low voltage activates AM section
and disables stereodecoder VCO, Phase detector, Pilot detector, SNC and FM section
44)Hold capacitor for Noise detector average level
low voltage applied mutes the stereo decoder outputs
45)HCC timing / hold capacitor, deemphasis right
46)HCC timing / hold capacitor, deemphasis left
47)AF output left
48)AF output right
49)Control voltage HCC (high cut control)
50)Control voltage SNC (stereo noise control)
51)Pilot indicator output, active high (open collector)
52)Pilot detector capacitor, low voltage activates mono state
53)Stereo decoder MPX signal input
54)Stereo decoder PLL phasedetector, loop filter
55)VCO pin for ceramic resonator
56)Reference current pin, external reference resistor
57)Noise detector input
58)FM MPX signal and AM demodulator signal output
59)Dynamic FM mute control blocking capacitor
60)Demodulator circuit FM
61)Demodulator circuit FM
62)Supply voltage IF and stereodecoder section
63)AM/FM fieldstrength combined output
64 )Auxiliary multipath detector input (in parallel to internal connection)

Junction temperatureTJ-40150°CStorage temperatureTS-40125°CThermal resistanceRthSA54K/WESD-voltage, HBMVESD-4+4kV *)100pF, 1500 Ω∗) 4 kV ESD protection is not valid for pin 14, 15 and 37.
Supply voltageVS89VAmbient temperatureTA-4085°C
Supply voltageVS=8.5 V
Ambient temperatureTamb= 25 °CCurrent consumptionISFMFM mode180100120mASAMAM mode17695114mAFrequency rangef1st LO180140MHzFrequency rangef1st LOQfactor of coil >90Lab50150MHzCounter outputV41RL41=330Ω1100130mVrms 4Divided counter output V40 RL40=330Ω1100130mVrms5Output impedanceR40 Lab0.811.2kΩOutput impedanceR41 Lab240300360ΩFrequencyf1st LOVtuning=0VtbfMHzfIF1= 10.7 MHzDC input voltageV2314.44.75.0VInput resistanceR23 AM/FM11.51.82.2kΩOutput resistanceR18open Collector1100kΩOutput resistanceR19 1265330396ΩVoltage gainA23-19FM, R19=330ΩLab242730dBVoltage gainA23-18AM, R18=165ΩLab81114dBNoise figureFAMRG=330ΩLab6dBNoise figureFFMRG=330ΩLab7dBReference voltageV3714.54.85.1VOutput CurrentI3711mAfIF1= 10.7 MHzIF2= 450 kHz33-34= 1 MHz43=1V
Mixer 1 InterceptpointIP3 Lab134dBμV
3rd orderSpecial testcircuit necessaryMixer gainAM1V33,34=80mVrms ;Vout=V23Lab-2dB
( XF=1k5//5p;aF=-2dB)Over all gainAM IFV33,34=80mVrms ; Vout=VIF10.7 1159dBMax. input voltageV33-34SINAD> 34dB;m=80%111001400mVpp5Noise figure (10 MHz)FRg opt=700ΩLab7dBInput impedance R33-34sym.Lab3.244.8kΩInput impedance C33-34sym.Lab1.622.4pFInput impedance R33-34asym.Lab1.622.4kΩInput impedance C33-34asym.Lab3.244.8pF1st LO divided by 8V24Low100.7V
Prestage AGC outputAGC-voltage AMV20V33,34 =50mVrms167VAGC-voltage AMV20V33,34 =200mVrms100.5VAGC-voltage FMV32V33,34=50mVrms100.15VAGC-current FMI21V33,34=50mVrms100.1mAIntegrator CurrentI31*V33,34=50mVrms Vm=3V1-30- 38-49μAIntegrator CurrentI31*V33,34=200mVrms Vm=3V1+32 +40+51μA
Mixer 2Max. Mixer gainAM2 V17 =1mV; Vout=VIF4501172023dB
f17=10.7 MHz; f14=10.25 MHzMixer AGC-range ΔAΔA=AV17=1mV - AV17=100 mV1172023dBMixer gain seek mode onV17=1mV; V3=0.7V1172023dBNoise figureFLab10dBIntegrator CurrentI42*V17=0 Vm=3V1+80 +150+230μAIntegrator CurrentI42*V17=100mVrms Vm=3V1- 190- 270- 380μA
2nd LOOperational frequency f1419.2510.2511.25MHzExternal force voltageV14Rg=600Ω;Ck= 100pF130mVrmsInput Imp. Crystal Osc.Z14Lab-500-600-400ΩCrystal ResistanceRC1PTOTC=50μW; Fundamental100ΩSpurious Harm. Cryst.aSPPTOTC=50μW; F<30 MHz-20dBfIF=10.7 MHz
f35-36=100 MHz
V43=open
Mixer 1InterceptpointIP3Lab125dB μV
3rd orderspecial testcircuit necessaryNoise figure (10 MHz)FRg opt=500ΩLab6dBMixer gainAM1V35-36=10mVrms; Vout =V23Lab9dB
(RF=330Ω ;aF=-4dB)Over all gainAM IFV35,36=10mVrms ; Vout=VIF10.71263238dBInput impedance R35-36sym.Lab3.244.8kΩInput impedance C35-36sym.Lab1.622.4pFInput impedance R35-36asym.Lab1.622.4kΩInput impedance C35-36asym.Lab3.244.8pF
Prestage AGC output AGC voltage FMV32V35,36=0mVrms15.66.47.2VAGC voltage FMV32V35,36=50mVrms100.1VAGC current FMI21V35,36=0 mVrms19.51214.5mAAGC current FMI21V35,36=50mVrms100.1mAAGC voltage AMV28V35,36=0100.5VIntegrator CurrentI32*V35=0 Vm=4.8V1- 12- 25- 46μA
Measuring condition:
fiIF=10.7 MHz; Δf= ±75 kHz; fmod= 1 kHz;V7 =10 mVrms
V44=open; Deemphasis= 100 μsField strength outputV63
-dynamic rangesee Diagram D116672dB
-nonlinearitysee Diagram D21±1dB
-temperature driftsee Diagram D31±3dB
-load capacitance50pF
-load resistance1kΩ
V63V7=200mVrms144.65.2V
V63V7=1mVrms11.51.92.3V
V63V7=0mVrms101VAF-output voltageV58 FMRL>10kΩ; Deemph.=100 μs1400500600mVrms AF-output voltageV58 FMRL>10kΩ; no Deemph.Lab600mVrms Input voltage forV7V58=V58 FM - 3dB13342μVrms
limiter thresholdTotal harmonicTHD111.2%
distortionAM-suppressionaAMm=30 %17080dBSignal-to-noise ratioaS/N17280dBAF muteaAFV59=01101214dBf57=200 kHzAttack currentI1 *)V64AC=1Vpp , Vm=5.0 V16008001000μARecovery currentI1 *)V64AC=0; Vm=3.6 V1- 6- 9-12μAStart voltageV2DefV57AC=0V14.44.7VDetector characteristicV2f57=25kHz; V57=100mVpp1 V2Def-0.14V V2Def-0.1V V2Def-0.07VVDetector characteristicV2f57=200kHz; V57=100mVpp1V2Def-1.8V V2Def-1.6V V2Def-1.4VV
Measuring condition:53=600mVrms; f=1 kHz; 15kHz LP with 19kHz Notch; see appendix
Total harmonicTHD47,48f= 1 kHz10.10.3%
distortionSignal to noise ratioS/N47,48 Stereo16575dBChannel separationaSep12840dBAF output voltageV47,48Stereo 1310390470mVrmsOverdrive marginV47,48 max THD= 1%148dBAF output DC voltageVDC 47,4812.533.5VDifference of outputΔV47,4812dB
voltage levelsMuting depthA47,48V44=017075dBMuting depthA47,48V44=0.7V17075dBDC-offset at muteΔDC 47,481-1000100mVDC-offset stereo on/off ΔDC 47,481-1000100mV

Partno	Mfg	Dc	Qty	Available	Descript
TUA4300G	SIMENS	N/a	390	avai	One Chip car radio, AM/FM Receiver