Description
The audioprocessor TDA7437N 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 either via the serial bus (Mute byte, bit D0), or directly on pin 28 through an I/O line of the microcontroller Very low DC stepping is obtained by use of a BICMOS technology.

Features
■ Input multiplexer
   – Four stereo, one mono input, and one differential input
   – Selectable input gain for optimal adaptation to different sources
■ Fully programmable loudness function
■ Volume control in 1dB steps including gain up to 16dB
■ Zero crossing mute, soft mute and direct mute
■ Bass and treble control
■ Four speaker attenuators- four independent
   speakers control in 1dB steps for balance and fader facilities
■ Pause detector programmable threshold
■ All functions programmable via serial I2C bus