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Partno	Mfg	Dc	Qty	Available	Descript
TDA4445	TEMIC	N/a	6800	avai	SOUND IF AMPLIFIER
TDA4445A	THOMSON	N/a	25	avai	Quasi Parallel Sound Processing with Quadrature Intercarrier Demodulator
TDA4445A	ST	N/a	20	avai	Quasi Parallel Sound Processing with Quadrature Intercarrier Demodulator
TDA4445B	ST	N/a	250	avai	Quasi Parallel Sound Processing with Quadrature Intercarrier Demodulator
TDA4445B	TFK	N/a	4769	avai	Quasi Parallel Sound Processing with Quadrature Intercarrier Demodulator

TDA4445 ,SOUND IF AMPLIFIERTDA4445ATDA4445BSOUND IF AMPLIFIER.QUADRATURE INTERCARRIER DEMODU-LATOR.VERY HIGH INPUT SENSITIVITY ..
TDA4445A ,Quasi Parallel Sound Processing with Quadrature Intercarrier DemodulatorGENERAL DESCRIPTION essing, independentfrom AM.Linear quadrature demodulatorThis circuit includes t ..
TDA4445A ,Quasi Parallel Sound Processing with Quadrature Intercarrier Demodulatorapplications (B/G and L)No adjustmentof the AM demodulatorLow AM distortionPIN CONNECTIONSIF INPUT ..
TDA4445B ,Quasi Parallel Sound Processing with Quadrature Intercarrier DemodulatorBLOCK DIAGRAMSTDA4445ATDA4445B
TDA4445B ,Quasi Parallel Sound Processing with Quadrature Intercarrier DemodulatorBLOCK DIAGRAMSTDA4445ATDA4445B
TDA4470 ,Multi-standard video IF (neg/pos) and quasi parallel sound processing (FM, NICAM, AM)TDA4470Multistandard Video-IF + Quasi Parallel Sound ProcessingDescriptionThe TDA4470 is an integra ..
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TF252TH-4-TL-H , Electret Condenser Microphone Applications
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TF2-H-5V , SMALL POLARIZED RELAY WITH HIGH SENSITIVITY
TF2-L2-5V , SMALL POLARIZED RELAY WITH HIGH SENSITIVITY

TDA4445-TDA4445A-TDA4445B
SOUND IF AMPLIFIER
TDA4445A
TDA4445B
SOUND IF AMPLIFIER INPUT
NOT TOBE CONNECTED AGC TIME CONSTANT
NOT TOBE CONNECTED
REFERENCE L.C. NETWORK REFERENCE L.C. NETWORK
NOTTOBE CONNECTED
SUPPLY VOLTAGE MODULATED SOUND OUTPUT
GROUND INPUT
NOTTOBE CONNECTED
NOTTOBE CONNECTED
NOT TOBE CONNECTED
NOTTOBE CONNECTEDFOR TDA4445A
AVERAGING CAPACITOR FOR TDA4445B
NOTTOBE CONNECTEDFOR TDA4445A
A.F. SOUND OUTPUTFOR TDA4445B
PIN CONNECTIONS
DIP16
(Plastic Package)
ORDER CODE: TDA4445A- TDA4445B
.QUADRATURE INTERCARRIER DEMODU-
LATOR.VERY HIGH INPUT SENSITIVITY.GOOD SIGNAL TO NOISE RATIO. FASTAVERAGING AGC.IF AMPLIFIER CAN BE SWITCHED OFF FOR
VTR MODE.GOOD AM SUPPRESSION.OUTPUT SIGNAL STABILIZED AGAINST
SUPPLY VOLTAGE VARIATIONS.VERY FEW EXTERNAL COMPONENTS
DESCRIPTION
TDA4445A:
SoundIF amplifier, with FM processing for quasi
parallel sound system.
TDA4445B:
SoundIF amplifier, with FM processing and AM
demodulator, for multi-standard sound TV appli-
ances.
TDA4445B additionnal:
Bistandard applications (B/G andL) adjustmentof the AM demodulator
Low AM distortion
4445-02.EPS
4445-03.EPS
BLOCK DIAGRAMS
GENERAL DESCRIPTION
This circuit includes the following functions:.Three symmetrical and gain controlled wide
band amplifier stages, which are extremely sta-
bleby quasi DC coupling without feedback..Averaging AGC with discharge control circuit.AGC voltage generator
essing, independentfrom AM. Linearquadraturedemodulator. Sound-IF-amplifier stage with impedance con-
verter
AM-Demodulation (only TDA4445B):. Carrier controlled demodulator. Audio frequency stage with impedance con-
TDA4445A
TDA4445B
TDA4445A- TDA4445B
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
VCC Supply Voltage Range Pin11 15 V
ICC Supply Current Pin11 70 mA
Vext External Voltages Pin3
Pin12
Vext External Voltages TDA4445A- TDA4445B
TDA4445B
Pin5
Pin6
Ptot Power Dissipation 1 W Junction Temperature 125 °C
Tamb Ambient Temperature Range 0,+70 °C
Tstg Storage Temperature Range –25,+ 125 °C
4445-01.TBL
THERMAL DATA
Symbol Parameter Value Unit
Rth(j-a) Junction-ambient Thermal Resistance 70 °C/W
4445-02.TBL
ELECTRICAL OPERATING CHARACTERISTICS
Tamb =+25°C, VCC= 12V (unless otherwise specified)
Symbol Parameter Min. Typ. Max. Unit CHARACTERISTICS
VCC Supply Voltage Pin13 10 12 15 V
ICC Supply Current (V3= 3.5V) Pin11 45 60 mA DC Output Voltage (V3= 3.5V) Pin12 4.25 5 5.75 V Output DC Current(V3= 3.5VV11= 12V) Pin12 1 2 mA Input Impedance Pins 1-16 2 kΩ Input Impedance Pins 1-16 2 pF Switchoff Control Voltagefor VTR Mode Pin3 9 10 V Switchoff Control Currentfor VTR Mode Pin3 150 μA
AGC CHARACTERISTICS
ΔGIF IF AGC Range 62 dB
QUASI PARALLEL SOUND OPERATION
(fPC= 38.9MHz, fSC1= 33.4MHz, fSC2= 33.16MHz, PC/SC1= 13dB, PC/SC2= 20dB, PC unmodulated) Min. Input Voltage (5.5MHz- Output Signal- 3dB) Pins 1-16 70 μVeff Max. Input Voltage (5.5MHz- Output Signal+ 1dB) Pins 1-16 90 mVeff Sound-IF-output Voltage (V1-16= 20mVeff SC unmodulated)
5.5MHz Output Voltage
5.74MHz Output Voltage
Pin12
mVeff
mVeff+N
Signalto noise ratio measured accordingto CCIR 468-2
Picture Modulation Ratio 90%, Reference signal (V1-16= 10mV),
FM-frequency deviation30kHz� Out1 350mVRMS
fmod= 1kHz, measuredat audio-output Out2 350mVRMS
Black Screen(1. Channel/2. Channel)
Grid Screen(1. Channel/2. Channel)
Pin12
55/50
45/40 DEMODULATI0N (TDA4445B only) (fSC= 39.2MHz,m= 80%, fmod= 1kHz) Min. Input Voltage (Audio Output Signal- 3dB) Pins 1-16 70 μVeff Output DC Voltage (V1-16= 10mVeff unmodulated) Pin6 3.3 4.5 V Output DC Current(V6= 7.5V,V3= 3.5V) Pin6 0.3 1.2 mA
TDA4445A- TDA4445B
4445-04.TIF
TYPICAL APPLICA TION
Figure1: Quasi Parallel Sound Operation
TDA4445A- TDA4445B
4445-05.TIF
TYPICAL APPLICA TION
Figure2: Bistandard Operation (FM stereo sound+ AM sound)
TDA4445A- TDA4445B
PM-DIP16.EPS
PACKAGE MECHANICAL DATA PINS- PLASTICDIP
Information furnishedis believedtobe accurate andreliable.However, SGS-THOMSON Microelectronics assumes noresponsibility
forthe consequencesof useof such information norfor any infringement ofpatents orotherrightsof third partieswhich mayresult
from itsuse.No licence isgrantedby implication orotherwise under anypatentor patent rightsof SGS-THOMSONMicroelectronics.
Specifications mentionedin this publicationare subjectto change without notice. This publication supersedes and replacesall
information previously supplied. SGS-THOMSON Microelectronics productsarenot authorizedforuseas criticalcomponentsinlife
support devicesor systems withoutexpress written approvalof SGS-THOMSON Microelectronics. 1994 SGS-THOMSON Microelectronics-All Rights Reserved
PurchaseofI2C Componentsof SGS-THOMSON Microelectronics, conveysa license underthe Philips2C Patent.Rights touse these componentsinaI2C system, isgranted provided thatthe system conformsto
theI2C Standard Specificationsas definedby Philips.
SGS-THOMSON Microelectronics GROUP OFCOMPANIES
Dimensions Millimeters Inches
Min. Typ. Max. Min. Typ. Max. 0.51 0.020 0.77 1.65 0.030 0.065 0.5 0.020 0.25 0.010 20 0.787 8.5 0.335 2.54 0.100 17.78 0.700 7.1 0.280 5.1 0.201 3.3 0.130 1.27 0.050
DIP16.TBL
TDA4445A- TDA4445B

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