General Description The ET2354 is a 4 stereo inputs/2-channel outputs digital control audio processor for the low voltage operation. Volume, tone(bass and treble), and balance(left/right) processor are incorporated into a single chip. The ET2354 also has the loudness function and selectable input gain. These functions can be built a Hi-Fi audio system easily. All functions are programmable via the serial I2 C bus. The default states of the chip as the power is on are: the volume is -78.75dB, the stereo 4 is selected, all the speakers are mute and the gains of the input stage, the bass and the treble are 0dB. Features z Operation range: 2.7V~5V z 4 stereo inputs with selectable input gain z 2 independent speaker controls for balance z Tone controls (treble and bass) z Loudness and independent mute function z Volume control in 1.25dB/step z I 2 C interface z Components less and good PSRR z Housed in SOP28,TSSOP28(ET2354V) package Applications z Portable audio device z Car stereo audio z Hi-Fi audio system