TDA4445A-TDA4445B データシートの表示（PDF） - STMicroelectronics

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TDA4445A-TDA4445B

SOUND IF AMPLIFIER

STMicroelectronics 

TDA4445A - TDA4445B

BLOCK DIAGRAMS

TDA4445A

TDA4445B

.GENERAL DESCRIPTION

This circuit includes the following functions :

Three symmetrical and gain controlled wide

.. band amplifier stages, which are extremely sta-

ble by quasi DC coupling without feedback.

Averaging AGC with discharge control circuit

AGC voltage generator

.Quasi parallel sound operation :

High phase accuracy of the carrier signal proc-

2/6

.. essing, independentfrom AM

Linear quadrature demodulator

Sound-IF-amplifier stage with impedance con-

verter

AM-Demodulation (only TDA4445B) :

. Carrier controlled demodulator

. Audio frequency stage with impedance con-

verter

. Averaging low pass AGC

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