USB Audio Codec improved on CM108AH with crystal-less design

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Lead Time 28 weeks
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Unit Price:$1.64
Minumum Qty: 1
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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.

Cmedia CM108_001.jpg

Symmetry Electronics (and its e-commerce division: is an authorized Cmedia distributor.


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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
EEPROM Write Function via Vendor Specific request for Mass Production Convenience
External EEPROM Interface for Vendor Specific USB VID, PID, and Serial Number


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Cmedia CM108B Datasheet
Product Selector Guide

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