USB Audio Codec improved on CM119A with crystal-less design

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CM119 is a highly integrated single chip USB audio controller specifically for VoIP (Voice over internet protocol) application. All essential analog modules are embedded in CM119, including dual DAC and earphone driver, ADC, microphone booster, PLL, regulator, and USB transceiver. 8 GPIO pins can constitute a 24 key matrix directly support keypad control function without MCU. It’s also support 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 customized unique USB VID/PID to EEPROM for VoIP software authentication. Moreover, individual unique phone number for each device is possible via serial number stored in external EEPROM. Moreover, CM119 provided I2C interface with MCU application for LCM integrated and advanced functions.

VoIP applications are becoming increasing popular as VoIP can provide free or low-cost calling worldwide. To provide a VoIP experience that is the same as using a regular phone and eliminate the poor call quality that results from using the PC audio, C-Media has developed CM119 USB Controller that enables a regular phone, handset, or headset which is interfaced to the USB port on the PC. With the C-Media OEMs can quickly bring to market a family of low cost high quality VoIP products.

Product benefit:

• Entry Level Solution for Cost Effective Products
• Stereo DAC Output with build-in Class-AB Amplifier for Headphone
• Mono ADC Microphone Input with Optional +20dB Booster
• Synchronized Digital Volume Control Buttons with PC or Laptop
• Plug and Play via Single USB Plug without External Power
• Low Power Consumption
• USB IF Certified, High Compatibility

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 Operation System Mixer Unit Enable/Disable under Headset Mode


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Cmedia CM119B Datasheet

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