CM108 Datasheet – USB Audio Controller – C-Media

Part Number: CM108


High Integrated USB Audio I/O Controller

Package: 48 Pin LQFP Type ( 7mm×7mm×1.4mm )

Manufacturer: C-MEDIA ELECTRONICS ( )




The CM108 is a highly integrated single chip USB audio solution. All essential analog modules are embedded in CM108, including dual DAC and earphone driver, ADC, microphone booster, PLL, regulator, and USB transceiver. It is very suitable for USB headset, USB earphone or USB audio interface box application. Many features are programmable with jumper pins or external EEPROM. In addition, audio adjustment can be easily controlled via specific HID compliant volume control pins. For value added application, external codec or audio DSP can be connected to CM108 via I2S pin for further processing. 4 GPIO pins can be accessed with customer application software for additional value added application.



1. Compliant with USB 2.0 Full Speed Operation

2. Compliant with USB Audio Device Class Specification v1.0

3. Supports USB Suspend / Resume Mode and Remote Wakeup with Volume Control Pins

4. Single 12MHz Crystal Input with On-chip PLL and Embedded USB Transceiver

5. Jumper Pin for Speaker Mode (Playback Only) or Headset Mode (Playback + Recording)

6. For Headset Mode, USB Audio Function Topology has 2 Input Terminals, 2 Output Terminals, 1 Mixer Unit, 1 Selector Unit, and 3 Feature Units

7. Jumper Pin for Mixer Unit Enable / Disable under Headset Mode

8. For Speaker Mode, USB Audio Function Topology has 1 Input Terminal, 1 Output Terminal, and 1 Feature Unit

9. Support One Control Endpoint, One Isochronous Out Endpoint, One Isochronous In Endpoint, and One Interrupt In Endpoint






CM108 Datasheet


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