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Description

The audioprocessor TDA7342 is an upgrade of the TDA731X audioprocessor family.

Due to a highly linear signal processing, using CMOS-switching techniques instead of standard bipolar multipliers, very low distortion and very low noise are obtained. Several new features like softmute, and zero-crossing mute are implemented. The soft Mute function can be activated in two ways:

1. Via serial bus (Mute byte, bit D0)

2. Directly on pin 21 through an I/O line of the microcontroller

Very low DC stepping is obtained by use of a BICMOS technology.

Features

■ Input multiplexer

– Two stereo and one mono inputs

– One quasi differential input

– Selectable input gain for optimal adaptation to different sources

■ Fully programmable loudness function

■ Volume control in 0.3dB steps including gain up to 20dB

■ Zero crossing mute, soft mute and direct mute

■ Bass and treble control

■ Four speaker attenuators

– Four independent speakers control in 1.25dB steps for balance and fader facilities

– Independent mute function

■ All functions programmable via serial I2C bus