TEA7530
CIRCUIT DESCRIPTION
TEA7530 is a 8 pin DIP integrated circuit provid-
ing the following facilities:
♦ Loudspeaker amplifier
♦ Antidistortion feed-back system (limited line
current compensation)
1.1. LOUDSPEAKER AMPLIFIER
The amplifier is divided into 2 main sections.
- Automatic Gain Control (AGC)
- Push-pull amplifier (bridge structure)
Figure 9
a) The AGC section is used for the antidistortion
system.
♦When used in a telephone set to avoid larsen
effect the AGC automatically decreases loud-
speaker amplifier gain.
♦When the required output level exceeds the
capabilities of the available current, the AGC
decreases the loudspeaker amplifier gain to
avoids distortion.
b) The output amplifier uses a double push-pull
configuration (H bridge) to get maximum dynamic
range under limited supply conditions.
Figure 10
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