TEA7532 ST Microelectronics, Inc., TEA7532 Datasheet - Page 6

• Manufacturer Part Number: TEA7532
• Description: Monitor Amplifier With Anti-larsen Function And Adjustment (full Duplex)
• Manufacturer: ST Microelectronics, Inc.

TEA7532
CIRCUIT DESCRIPTION
TEA7532 is a 16 pin DIL integrated circuit providing
the following facilities :
1.1. LOUDSPEAKER AMPLIFIER
Figure 11.
The amplifier is divided into 3 main sections.
a) The AGC section is used for the antilarsen and
antidistortion system.
Figure 12.
6/16
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When used in a telephone set to avoid larsen ef-
fect the AGC automatically decreases loud-
speaker amplifier gain.
When the required output level exceeds the
capabilities of the available current, the AGC
Loudspeaker amplifier
Automatic Gain Control (AGC)
Preamplifier
Push-pull amplifier (bridge structure)
b) The preamplifier permits step control of amplifier
gain in steps of 6 dB, using pins PG0 and PG1,
which may be controlled using switches or by a mi-
croprocessor. The amplifier may be muted using the
ON/OFF control signal (pin 16).
c) The output amplifier uses a double push-pull con-
figuration (H bridge) to get maximum dynamic range
under limited supply conditions.
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decreases the loudspeaker amplifier gain to
avoid distortion.
Antiacoustic feed-back system
(antilarsen system)