USB audio DAC with Class-AB speaker amp

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Lead Time 28 weeks
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CM102-A+/102S+ series is a highly integrated single chip for USB stereo speakers application. Minimum external components are needed for building an USB speaker system, which makes CM102-A+/102S+ a simple and very cost-effective solution. Since no driver is necessary for audio playback on all major OS. CM102-A+/102S+ provides a truly plug-and-play feature for external digital audio playback.
For energy saving, USB suspend mode and resume is supported by CM102-A+/102S+. With power amplifier enable pin and volume control VR input pin, a traditional speaker front panel design can be built. 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. More flexible and customized design is possible with GPIO pin, which is accessible by USB vendor specific request.
This one chip solution not only embedded USB transceiver, ADC, DAC component but also integrated digital control power amplifier function for USB digital sound application. The Dynamic Range Control function can support high efficiency volume output to get loudness sound effect similar D class amplifier capability. Vender can just using single chip to saving external amplifier component and getting a better listen experience when listen to a music source with wide dynamic range.
Unify Power Adapter via USB Power 
Portable Plug and Play via Single USB Plug without External Power
Digital Audio Signal to Reduce Analog Noises
Synchronized Digital Volume Control with PC or Laptop
2CH DAC with Class AB 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 operation with suspend mode support
USB audio function topology has 1 input terminal, 1 output terminal, and 1 feature unit
Embedded high performance 16 bit stereo audio DAC
Embedded Digital Control Power Amplifier for Speaker Driving
Embedded power on reset block and Power amplifier enable / disable control pin
Embedded X2 Modulation for Higher Audio Quality
Embedded Anti-Pop Circuit with Internal Feedback Structure
Embedded 5V to 3.3V Regulator with Voltage Level Detector for Single 5V External Power Supply
Alternate zero bandwidth setting for releasing bandwidth on USB bus during inactive operation
Single 12MHz crystal input with on-chip PLL and embedded USB transceiver
Support Dynamic Range Control (DRC) Feature to Provide a Better Listen Experience
Volume control input with simple external VR circuit
Isochroous transfer using adaptive synchronization with internal PLL
High performance 16-Bit Stereo, 48 / 44.1 KHz Sampling Rate for Audio Playback
3.3V IO with 5V tolerance; 3.3V core logics design
GPIO pin for application specific usage
Support S/PDIF output interface
LED Indicator Pin During Playback
Compatible with Win 98SE / Win ME / Win 2000 / Win XP / Vista, and Mac OS X without additional driver
Compact 18 pin PDIP and SOP package


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Cmedia Datasheet

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