CM119A USB Audio Controller

  1. Breakout of C-Media Chip in a Soundcard
  2. References


The CM119A is a single chip USB audio controller specifically for VoIP (Voice over internet protocol) application. All essential analog modules are embedded in CM119A, including dual DAC and earphone driver, ADC, microphone booster, PLL, regulator, and USB transceiver. It’s also support 8GPIO pins and buzzer output pin for VoIP application. In addition, audio adjustment can be easily controlled via specific HID compliant volume control pins. Many features are programmable with jumper pins or external EEPROM. Vender can customize unique USB VID / PID / Product_String / Manufacture_String to EEPROM for VoIP software authentication.

CM119A Schematic:
Source Documentation Sites:



Breakout of C-Media Chip in a Soundcard




CMedia's CM119 USB Audio Chiopset:

Glenn Lyons VK4PK
Ver:gnl20182018 - pre published v0.9