This part is a kind of semiconductor called PT2311.

Function of this product has Four-channel Digital Control Audio Processor Utilizing CMOS Technology.

Manufacturers : Princeton Technology

Image and pinout :

Some of the text within the PDF file :

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw 4-Channel Audio Processor PT2311 DESCRIPTION PT2311 is a four-channel digital control audio processor utilizing CMOS Technology. Volume, Bass, Balance, Front/Rear Fader Processor, Selectable Input Gain are incorporated into a single chip having the highest performance and reliability with the least external components. All functions are programmable using the I2C Bus. PT2311 is housed in 28-pin SOP Package. The 28-pin version provides additional Two Band Tone Control and Loudness Function and is pin-to-pin compatible with TDA7313. Pin assignments and application circuits are optimized for easy PCB layout and cost saving advantages. FEATURES • CMOS Technology • Least External Components • T [ ... ]

PT2311 PDF Datasheet Download