USB Class-D amp with digital volume control

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Lead Time 28 weeks
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CM6120S series is a highly integrated single chip for USB speaker application with 2-Channel Class-D output. Minimum external components are needed for building an USB speaker system, which makes CM6120S a simple and very cost-effective solution. Since no driver is necessary for audio playback on all major OS. CM6120S provides a truly plug-and-play feature for external digital audio playback.
For energy saving, USB suspend mode and resume is supported by CM6120S. This new single chip not only support 44.1KHz and 48KHz sampling rate playback but also with X2 modulation for hi-frequency quality. Better yet, simplify anti-pop noise solution was embedded on chip for general pop noise issues. All of the functions have been approved by USB IF certification program. This one chip solution not only embedded USB transceiver but also integrated digital control power amplifier function for USB digital sound application.
CM6120S support USB standard HID interface which provide Volume_up / Volume_dn / Play_mute / buttons for pure digital volume and media play control. CM6120S also provide EEPROM (24c02) connection interface for customers to define vendor specific VID / PID / Manufacture String / Product String / default volume setting, and even special hardware configuration.
  • Windows® Vista™ / 7 WHQL Certification
  • Unify Power Adapter via USB Power
  • Portable Plug and Play via Single USB Plug without External Power
  • Isolate the Noise Interference from PC / Laptop system
  • Synchronized Digital Volume Control with PC or Laptop
  • 2CH DAC with Class D amplifier


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USB 2.0 Full speed compatible and USB IF certification
USB audio device class specification v1.0 compatible
USB bus powered 500mA, with no need for external power supply
High performance 16-Bit stereo, 44.1 / 48 KHz sampling rate for audio playback
High efficiency high performance 2W x 2-CH Class D amplifier, differential output with no pop-noise
Embedded Power-On-Reset block
Embedded 5V to 3.3V regulator for single 5V external power supply
Self power / Bus power selectable (by EEPROM)
Single 12MHz crystal input with embedded PLL
Isochronous transfer using adaptive synchronization with internal PLL
External 24c02 EEPROM interface for vendor specific VID / PID / Manufacture string / Product string / and Hardware configuration (volume for DAC / Line-in AA, etc.)
EEPROM Read / Write function via vendor command or HID command
USB HID digital volume control input for Volume_up / Volume_dn / Play_mute buttons and remote wakeup with HID buttons
Playback with soft-mute function
Digital volume boost function
Integration circuits quality meet Vista Hardware Logo requirement
3.3V IO with 5V tolerance.
Compact 28 pin TSOP package in CM6120S

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