C Media 
USB 2.0 audio chip with integrated 8051
The cmedia CM6500B is a USB 2.0 audio chip with integrated 8051 for flexible applications. With an internal 2-channel ADC and DAC and S/PDIF interface makes the CM6500B suitable for Headset, Docking, Speaker and Mic applications. The internal 8051 can be also developed for a lot of different applications, such as Lync device, iDevice docking or even Android Phone or Tablet/Slate docking device.
CM6500B is compatible with USB audio Class 1.0, and can plug & play without additional software installation on the major operation systems. The internal DAC/ADC and S/PDIF out interface support 48K/44.1KHz sampling rate and 16bit resolution.
- USB 2.0 full-speed compliant
- USB Audio Class 1.0 compliant
- USB Human Interface Device (HID) Class 1.1 compliant
- 2 channel DAC for audio output interface
- 2 channel ADC for audio input interface
- Build in 48K/44.1KHz and 16bit S/PDIF transmitter
- Build in AGC on recording path
- Support USB suspend/resume/reset functions
- Support control, interrupt, bulk, and isochronous data transfers
- Embedded 8051
- Master I2C control interface for external audio devices or EEPROM access
- 14 GPIO pins
- USB Compliance
- USB 2.0 full-speed compliant
- USB Audio Class 1.0 compliant
- USB Human Interface Device (HID) Class 1.1 compliant
- Supports USB suspend/resume/reset functions
- Supports control, interrupt, bulk, and isochronous data transfers
- Playback Streams:
- -Stereo DAC
- *Sample Rates: 8K/11.025K/16K/22.05K/32K/44.1K/48K
- *Supports Bit Length: 16 bit
- -Builds in S/PDIF transmitter
- *Sample Rates: 44.1K/48K
- *Supports Bit Length: 16 bits
- Recording Streams:
- -Stereo ADC
- *Sample Rates: 8K/11.025K/16K/22.05K/32K/44.1K/48K
- lSupports Bit Length: 16 bits
- Embedded 8051 micro-processor to handle the comment/protocol transactions
- Connects to an external EEPROM memory for firmware codes
- HID interrupts can be implemented via firmware codes
- Provides maximum HW configuration flexibility with firmware code upgrade
- VID/PID/Product String can be customized via firmware code programming
- Control Interface
- Master I2C control interface for external audio devices or EEPROM access
- Max. 14 GPIO pins can be configured via firmware programming
- GPIOs are configured as HID key and LED indicators
- Hardware pins for mode configuration including Headset, Speaker, Docking and Mic
- Hardware pin for A-A path enable/disable
- Only single 12MHz crystal input is required (embedded PLL function)
- Single 5V power supply (embedded 5V to 1.8V regulator for digital core, 5V to 3.3V regulator for digital IO, 5V to 3.5V regulator for analog codec)
- 3.3V digital I/O pads with 5V tolerance
- Industrial standard LQFP-48 package (7x7mm)
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