This part is a kind of semiconductor called 7442.

Function of this product has TONE CONTROL AND SURROUND DIGITALLY CONTROLLED AUDIO PROCESSOR.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

® TDA7442 TDA7442D TONE CONTROL AND SURROUND DIGITALLY CONTROLLED AUDIO PROCESSOR 4 STEREO INPUTS INPUT ATTENUATION CONTROL IN 0.5dB STEP TREBLE AND BASS CONTROL TWO SURROUND MODE AVAILABLE WITH 4 SELECTABLE RESPONSES: - MUSIC - SIMULATED STEREO TWO SPEAKER ATTENUATORS: - 2 INDEPENDENT SPEAKER CONTROLS IN 1dB STEPS FOR BALANCE FACILITY - INDEPENDENT MUTE FUNCTION ALL FUNCTIONS PROGRAMMABLE VIA SERIAL BUS 2 MONITOR OUTPUT (ONLY FOR TDA7442) DESCRIPTION The TDA7442/42D is volume tone (bass and treble) balance (Left/Right) processors for quality audio applications in TV and Hi-Fi systems. It reproduces surround sound by using a proPIN CONNECTIONS SO28 SDIP32 ORDERING NUMBER: TDA7442D (SO28) TDA7442 (SDIP32) grammable phase shifter. Control of all the functions is accomplished by serial [ ... ]

7442 PDF Datasheet Download