TDA4445A Datasheet, PDF (2/6 Pages) STMicroelectronics – SOUND IF AMPLIFIER

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}