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TDA4445B Datasheet(PDF) 2 Page - TEMIC Semiconductors

Part # TDA4445B
Description  Quasi Parallel Sound Processing with Quadrature Intercarrier Demodulator
PDF  8 Pages
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Manufacturer  TEMIC [TEMIC Semiconductors]
Direct Link  http://www.temic.de
Logo TEMIC - TEMIC Semiconductors

TDA4445B Datasheet(HTML) 2 Page - TEMIC Semiconductors

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TELEFUNKEN Semiconductors
TDA4445A/TDA4445B
Rev. A1: 14.09.1995
2 (8)
Pin Description
Pin
Symbol
Function
1–16
IF input
3
If AGC time constant
8–9
Tuned circuit
11
Supply voltage
12
Sound-IF-output
13
Ground
2, 4,
7, 10,
14, 15
not connected
TDA4445B additional
Pin
Symbol
Function
5
Average capacitor
6
AF output
Circuit Description
This circuit includes the following functions
D Three symmetrical and gain controlled wide band
amplifier stages, which are extremely stable by quasi
DC coupling without feedback
D Averaged AGC with discharge control circuit
D AGC voltage generator
Quasi parallel sound operation
D High phase accuracy of the carrier signal processing,
independent from AM
D Linear quadrature demodulator
D Sound–IF–amplifier stage with impedance converter
AM–Demodulation (TDA4445B only)
D Carrier controlled demodulator
D Audio frequency stage with impedance converter
D Averaged low pass AGC
Absolute Maximum Ratings
Reference point pin 3, unless otherwise specified
Parameters
Symbol
Value
Unit
Supply voltage range
Pin 11
VS
10 ... 15
V
Supply current
Pin 11
IS
70
mA
External voltages
TDA4445A, B
Pin 3
Pin 12
TDA4445B only
Pin 5, 6
Vext
12
8
8
V
Power dissipation in soldered position
Ptot
1
W
Junction temperature
Tj
125
°C
Ambient temperature range
Tamb
–25 to +70
°C
Storage temperature range
Tstg
–25 to +125
°C
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient
RthJA
60
K/W



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