Overview
The TDA 4390-2X is a single-chip audio sound system. The circuit can be partitioned into two functional blocks.

FEATUREs
1. Stereo sound processing
    • Four stereo AF inputs
    • Input/Output interface for external equalizer
    • Max. gain switchable between 0 dB and 6 dB
    • Bass and treble control
    • Four independent attenuators for volume balance and fader control
2. Control part
    • I2C Bus interface compatible for standard and fast mode
    • Control of sound processing