TDA7342

® TDA7342 DIGITALLY CONTROLLED AUDIO PROCESSOR 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 I2 CBUS 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 TQFP 32 ORDERING NUMBER: TDA7342 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. November 1999 1/14 OUT(L) BIN(L) TREBLE(L) SPKR ATT 25 MUTE ZERO CROSS + MUTE LOUD+ VOL BASS SPKR ATT 23 MUTE 28 SOFT MUTE SERIAL BUS DECODER + LATCHES 27 26 SPKR ATT R3 24 M R2 R1 ZERO CROSS + MUTE LOUD+ VOL MUTE TREBLE BASS TREBLE L3 17 32 16 21 18 15 9 IN(L) LOUD(L) SM C1 L1 L2 M L1 13 BOUT(L) 2/14 C17 100nF C11 C13 47nF C19 2.7nF C18 100nF R2 4.7K ...