DESCRIPTION

The CM108B is a highly integrated crystal-free USB audio single chip solution optimized for USB headset,headphone,and dongle applications.The CM108B comes with software driver interface which supports XearTM sound effects for multimedia entertainments.All essential analog modules are embedded in the CM108B,including dual DAC and earphone driver,ADC,microphone booster,PLL,regulator and USB transceiver modules.Many features are programmable with jumper pins or by external EEPROM.Audio adjustments are easily controlled via specific HID-compliant volume control pins.An external codec or audio DSP can be connected to the CM108B via I2S pin for further processing.Vendors can customize unique USB VID/PID/Product String/Manufacture String and min/max/initial volumes to EEPROM.The CM108B also comes with an anti-pop noise circuits design and internal oscillator which can operate without an external crystal oscillator.

FEATURES

Compliant with USB 2.0 Full Speed Operation

Compliant with USB Audio Device Class Specification v1.0

Supports USB Suspend/Resume Mode and Remote Wakeup with Volume Control pins

On-chip oscillator that provides reference sources for PLL and embedded USB transceiver

Jumper pin for Headset Mode(Playback+Recording)and Speaker/Headphone Mode(Playback Only)

Jumper pin for Mixer Unit enable/disable under Headset Mode and Power Mode setting

I2S interfaces for external CODEC

Anti-pop noise design for plugged and vice-versa

Support XearTM Audio Centre Software Driver forWindows OS