USB 2.0 Full Speed Audio

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Lead Time 28 weeks
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Product Information

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Purchase of the Cmedia CM6533DH requires a Dollby License.
The CM6533DH is a USB 2.0 audio chip built-in 8051 for flexible applications. With integrated Tri-Colors PWM LED driver and two-channel ADC/DAC and S/PDIF interface that makes it suitable for headset, docking, speaker and microphone applications. The internal 8051 can also be developed to a lot of different applications, such as Microsoft™ Lync/Skype/VoIP device, Android Phone or Tablet/Slate docking device. The CM6533DH is compatible with USB Audio Class 1.0 and USB 2.0 Full-Speed, thus it can plug & play without any additional software installation on major operating systems. The internal DAC and ADC support from 8 ~ 96 KHz sampling rate and 16/24 bits resolution.

The CM6533DH integrates equalizer on both playback and recording paths to compensate the frequency response of microphone and headphone.

The CM6533DH also integrates 256K Byte flash (Including 32KB F/W programming size) and crystal but requires few passive components to make a finish product. Thus, it can save the total BOM cost and PCB area can be smaller.

Product benefits:

• Supports Dolby® driver
• Two - channel DAC for audio output interface
• Two - channel ADC for audio input interface
• Embedded 1T 8051 with 32K Byte SRAM
• Embedded 256K Byte flash(Including 32KB F/W programming size)
• Embedded oscillator without external crystal
• Supports Digital Microphone interface
• Built-in S/PDIF transmitter
• Built-in 5-Band Hardware Equalizer on both playback and recording paths
• Built-in AGC (Auto Gain Control) on recording path
• Supports dual tone generator
• Supports USB suspend/resume/reset functions
• Supports control, interrupt, bulk, and isochronous data transfers
• Supports OMTP and CTIA auto switch on a 4-pole jack
• Integrated Tri-Colors PWM LED driver
• Master/Slave H/W I2C/SPI/UART control interface for external audio devices or FLASH access
• Built-in 30mW @ R=32? headphone amplifier
• On chip watchdog timer
• Windows® 7/ Windows® 8/ Windows® 8.1 Logo Program compatible

Symmetry Electronics (and its e-commerce division: is an authorized Cmedia distributor.


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USB Compliance
USB spec. 2.0 full-speed compatible and USB-IF certification
USB audio device class spec. 1.0 compliant
USB HID device class spec. 1.1 compliant
USB suspend/resume support
Embedded USB transceiver and power-on reset circuit
256K Byte Flash and 32K Byte programming size supported for flexible customizing
Integrates 5-Band Hardware Equalizer with up-to-4 preset modes
Built-in Automatic Gain Control (AGC) for microphone recording
MCU / Flash / GPIO control via HID / Vender command interface (MCU read/write support 16 bytes data transfer bandwidth)
Supports up to 12 GPIO pins
Single 5V power supply with embedded 5V-to-4.5V and 5V-to-3.3V regulators
Audio I/O
2-channel DAC outputs with 16-ohms headphone amplifier (support from 8 ~ 96 KHz sampling rate and 16/24 bits resolution.)
2-channel ADC inputs (support from 8 ~ 96 KHz sampling rate and 16/24 bits resolution.)
Supports stereo microphone inputs with independent voltage bias pins and analog mixer (monitoring) function
Supports ADC DC offset cancellation high-pass-filter
Supports optional digital S/PDIF output
Configurable USB audio topology to Headset/Speaker/Microphone modes by internal 8051 MCU
Control Interfaces
Featured with Microsoft HID controls including Vol_Up / Vol_Dn / Playback_Mute / Record_Mute / Play_Pause / Stop / Previous / Next hot-key buttons (enabled by default)
Optional analog DC VR volume control pin with internal ADC potentiometer
I2C/SPI/UART master/slave mode control interface
Supports Tri-color PWM LED indicator control pins(GPIO4,GPIO5,GPIO6)
Industrial standard small footprint LQFP-48 green package
Plug & Play on Windows XP / Vista / 7 / Mac OS X / Linux systems that supports standard USB audio class 1.0 device driver
Windows 7 / Windows 8 / Windows 8.1 Logo Program
Dolby Headphone V2 Driver
Pro-Logic IIx


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USB 2.0 Full Speed Audio
Part #: CM6533DH
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