Cmedia CM6620A a USB2.0 high-speed audio processor that can support the latest USB Audio Class 2.0 and 7.1-channel true high-definition audio and Line-In/Mic-In (all up to 192KHz/24bit). CM6620A solution integrates CM9882A as the default codec to provide high-fidelity 106dB SNR (48KHz@24bit) and ~-95dB THD+N (@1KHz) line output. It could also support 192KHz/24bit S/PDIF transmitter and receiver and also a USB2.0 MIDI I/O device for music creation applications. CM6620A has an embedded 8051 compatible microprocessor that can provide the best flexibility and functionality with the external upgradable 32KB NOR Flash ROM codes. With Cmedia versatile software technologies, CM6620A is a powerful audio core for high-value USB Audio Class 2.0 applications.


USB Compliance

  • USB Spec. Rev.2.0 high-speed/full-speed mode compatible
  • Latest USB Audio Device Class Definition Release 2.0/1.0 compatible (UAC2.0)
  • USB Human Interface Device (HID) Class Definition Release 1.1 compliant
  • Supports USB suspend/resume/reset functions
  • Supports control, interrupt, bulk, and isochronous data transfers

Audio Engine

  • Output capability (With CMEDIA CM9882A/A HD Audio Codec)
    -Up to 7.1 channel output
    -Sample Rate: 44.1K/48K/96K/192KHz (96K/192KHz are available only in USB Audio Class 2.0/High-speed mode)
    -Bit Resolution: 16/24 bit
    -Supports S/PDIF output via CM9882A/A codec
  • Input capability (With CMEDIA CM9882A/A HD Audio Codec):
    -2-channel input for Line-In & Mic-In
    -Supported Sample Rate: 44.1K/48K/96K/192KHz (192KHz are available only in USB Audio Class 2.0/High-speed mode)
    -Bit Resolution: 16/24 bit
    -Supports S/PDIF input
  • Embedded one USB MIDI I/O engine

Audio I/O

  • Integrated Intel HD-Audio codec compatible controller supports external HDA codec
  • One pair of USB MIDI I/O interface for pro-audio application

Integrated 8051 Micro-processor

  • Embedded 8051 micro-processor to handle the comment/protocol transactions
  • Connects to an external parallel NOR Flash/EEPROM memory (Max. 32KB, 55ns access time is required) for firmware ROM codes
  • HID interrupts can be implemented via firmware codes
  • Provides maximum HW configuration flexibility with upgradable firmware codes
  • VID/PID/Product String can be customized via firmware code programming

Control Interface

  • Slave I2C control interface for external master device communication
  • Interrupt pin for external master device read transaction
  • 6 GPIO pins


  • Embedded USB2.0 transceiver (up to 480MB bandwidth)
  • Auto detection for high-speed/full-speed
  • GPIO pin for USB Audio Class 2.0 and 1.0 application mode configuration
  • Only single 12MHz crystal input is required (embedded PLL function)
  • Only single 3.3V power supply required (embedded 3.3V to 2.5V regulator for digital core)
  • 3.3V digital I/O pads with 5V tolerance
  • Industrial standard LQFP-64 package

Value-added Software Features:

  • Supports USB Audio Class 2.0 and high-speed mode with Cmedia vendor drivers
  • USB Audio class 1.0 with full-speed/high-speed modes compatible with Windows® UAA driver, Mac OS X and Linux embedded USB audio drivers
  • For Windows, Cmedia drivers provide the following Key Features:
    -layback feedback endpoints to control the data transmission accuracy and to maximize the audio quality
    -Xear™ Pro
     *Supports ASIO2.2 driver 
    -Xear™ Living 
      *27 global environment effects
      *10-band Equalizer with 12 preset modes
      *7.1 virtual speaker shifter
      *Smart volume normalize(SVN)
      *FlexBass II(bass management and enhancement)
    -Xear™ Surround
      *Surround headphone(virtual 5.1 surround and 3D positional sounds, natural stereo music out-of-head to reduce fatigue)
      *Surround speaker(virtual 5.1 surround and 3D positional sounds, widening stereo 3D sound stage)
    -Xear™ new GUI
      *User profile setting
      *Customizable graphics and layout
  • Dolby® Options
  • ASIO2.2 Available
USB Audio,PCIe audio,USB audio ic,USB sound chip