CM108B Datasheet | C-Media

DESCRIPTION The CM108B is a highly integrated crystal-free USB audio single chip solution optimized for USB headset, headphone, and dongle applications. The CM108B es with software driver interface which supports Xear TM 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-pliant 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 es with an anti-pop noise circuits design and internal oscillator which can operate without an external crystal oscillator. FEATURES - pliant with USB 2.0 Full Speed Operation - pliant 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 Xear TM Audio Centre Software Driver for Windows OS BLOCK DIAGRAM PWRSEL MODE AREG36 DREG33 DREG18 PDSW MSEL 3.6V 3.3V 1.8V Regulator 5->3.6, 3.3 & 1.8 DR SK EEPROM Interface USBDP USBDN USB TRX USB Interface 48M 12M VOLUP VOLDN MUTER MUTEP DASCLK/ADSCLK DALRCK/ADLRCK LEDO DAMCLK/ADMCLK LEDR GPIOs SDOUT/SDIN Interface Logics I2S Out/In USB Control ISO Out...