USB audio codec with I2S and driver

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There is an updated version of the CM108AH USB Audio Codec. Please visit the CM108B page for more infomartion.
CM108AH is a highly integrated single chip USB audio solution. All essential analog modules are embedded in CM108AH, including dual DAC and headphone amplifier, ADC, microphone booster, PLL, regulator, and USB transceiver. 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 CM108AH via I2S pin for further processing. 3 GPIO pins can be accessed with customer application software for additional value added application.
Portable and Plug & Play
Isolate the Noise Interference from PC / Laptop system
Synchronized Digital Volume Control with PC or Laptop
2CH DAC with Headphone amplifier


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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
Single 12MHz Crystal Input with On-chip PLL and Embedded USB Transceiver
Jumper Pin for Speaker Mode (Playback Only) or Headset Mode (Playback + Recording)
For Headset Mode, USB Audio Function Topology has 2 Input Terminals, 2 Output Terminals, 1 Mixer Unit, 1 Selector Unit, and 3 Feature Units
Jumper Pin for Mixer Unit Enable / Disable under Headset Mode
For Speaker Mode, USB Audio Function Topology has 1 Input Terminal, 1 Output Terminal, and 1 Feature Unit
Support One Control Endpoint, One Isochronous Out Endpoint, One Isochronous In Endpoint, and One Interrupt In Endpoint
Alternate Zero Bandwidth Setting for Releasing Playback Bandwidth on USB Bus when this Device is Inactive
Supports AES/EBU, IEC60958, S/PDIF Consumer Formats for Stereo PCM Data at S/PDIF Output
Volume Up, Volume Down, and Playback Mute Pins support USB HID device class for Host Control Synchronization
Record Mute Pin with LED Indicator for Record Mute Status
External EEPROM Interface for Vendor Specific USB VID, PID, and Serial Number
EEPROM Write Function via Vendor Specific request for Mass Production Convenience
Customized Embedded VID, PID, Product String, Manufacture String and Volume Settings by Customer Request
3 GPIO Pins with Read/Write via HID Interface
Jumper Pin to Set the Power Mode (100mA or 500mA, Bus Power or Self Power)
Isochronous Transfer uses Adaptive Mode with Internal PLL for Synchronization
48K / 44.1KHz Sampling Rate for Both Playback and Recording
Soft Mute Function
Embedded High Performance 16-Bit Audio DAC with Earphone Phone Amplifier
Host Side Data Loss Noise Reduction Function
Embedded 16-Bit ADC Input with Microphone Boost
Embedded Power-On-Reset Block
Embedded 5V to 3.3V Regulator for Single External 5V Operation
Compatible with Win 2K / Win XP / Vista / 7, Linux, and Mac OS X without Additional Driver (WinCE / Win Mobile supported with C-Medias own Driver)
48 Pin LQFP Package


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Cmedia Datasheet

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