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TEMIC Semiconductors

TDA4445A Datasheet Preview

TDA4445A Datasheet

Quasi Parallel Sound Processing with Quadrature Intercarrier Demodulator

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TELEFUNKEN Semiconductors
TDA4445A/TDA4445B
Quasi Parallel Sound Processing with Quadrature
Intercarrier Demodulator
Technology: Bipolar
Features
D Very high input sensitivity
D Excellent signal to noise ratio
D Fast averaged AGC
D IF amplifier can be switched off for VTR mode
D Output signal stabilized against VS variations
D Very few external components
TDA4445B additional
D Targeting bistandard applications (B/G and L)
D Alignment free AM demodulator
D Low AM distortion
Case: DIP16
Figure 1. Block diagram TDA4445A
Rev. A1: 14.09.1995
Figure 2. Block diagram TDA4445B
1 (8)




TEMIC Semiconductors

TDA4445A Datasheet Preview

TDA4445A Datasheet

Quasi Parallel Sound Processing with Quadrature Intercarrier Demodulator

No Preview Available !

TDA4445A/TDA4445B
TELEFUNKEN Semiconductors
Pin Description
Pin
1–16
3
8–9
11
12
13
2, 4,
7, 10,
14, 15
Symbol
Function
IF input
If AGC time constant
Tuned circuit
Supply voltage
Sound-IF-output
Ground
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
Supply voltage range
Supply current
External voltages
TDA4445A, B
Parameters
TDA4445B only
Power dissipation in soldered position
Junction temperature
Ambient temperature range
Storage temperature range
Pin 11
Pin 11
Pin 3
Pin 12
Pin 5, 6
Thermal Resistance
Junction ambient
Parameters
Symbol
VS
IS
Vext
Ptot
Tj
Tamb
Tstg
Symbol
RthJA
Value
10 ... 15
70
12
8
8
1
125
–25 to +70
–25 to +125
Value
60
Unit
V
mA
V
W
°C
°C
°C
Unit
K/W
2 (8) Rev. A1: 14.09.1995


Part Number TDA4445A
Description Quasi Parallel Sound Processing with Quadrature Intercarrier Demodulator
Maker TEMIC Semiconductors
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TDA4445A Datasheet PDF






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