C Media

USB 2.0 high-speed audio processor

USB Compliance

• USB specification 2.0 high-speed-compatible
• Latest USB audio device class 2.0/1.0-compatible
• USB human interface device (HID) Class 1.1-compliant
• Supports USB suspend/resume/reset functions
• Asynchronous synchronization transfer to reduce clock jitter
• Supports control/interrupt/bulk/isochronous data transfers

Audio Engine

• 3 Independent playback streams:
  -Supported sample rate: 44.1K/48K/88.2K/96K/176.4K/192KHz (192K/176.4KHz are available only in USB Audio Class 2.0/High-speed mode)
  -Supported bit length: 16/24/32-bit
  -PDMA#A supports max. 8-ch to I2S output
  -PDMA#B supports S/PDIF output
  -PDMA#C supports 2-ch to I2S output
• 3 Independent capture streams:
  -Supported sample rate: 44.1K/48K/88.2K/96K/176.4K/192KHz (192K/176.4KHz are available only in USB Audio Class 2.0/High-speed mode)
  -Supported bit length: 16/24/32-bit
  -RDMA#A supports 2-ch from I2S input
  -RDMA#B supports 2-ch from I2S input
  -RDMA#C supports S/PDIF input (192KHz receiving supports only Crystal and PLL clock sources)

Audio I/O

• Five pairs of I2S or left-justified serial audio output interfaces (8+2-ch out)
• Two pairs of I2S or left-justified serial audio input interfaces (2+2-ch in)
• All the I2S input/out interfaces support master/slave mode
• Built-in 192K/176.4K/96K/88.2K/48K/44.1KHz, and 16/24-bit S/PDIF transmitter
• Integrated 192K/176.4K/96K/88.2K/48K/44.1KHz, and 16/24-bit S/PDIF receiver
• Supports S/PDIF IN-to-OUT loop-back path for signal transforming between TOSLINK and RCA connections

Integrated 8051 Micro-processor

• Embedded 8051 micro-processor handles comment/protocol transactions
• Connects to an external parallel Flash/EEPROM memory (64kb, 55ns access time is required) for firmware ROM codes
• HID interrupts can be implemented via firmware codes
• Provides maximum HW configuration flexibility with a 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
• Slave I2C control interface for external MCU communication
• 9 GPIO pins and 6 GPI pins

General

• Embedded USB 2.0 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 configurations
• Single 12MHz crystal input is required (embedded PLL function), or optional oscillator inputs for 49.152 or 24.576MHz (for x48KHz) and 45.158 or 22.5792MHz (for x44.1KHz)
• Single 3.3V power supply (embedded 3.3V to 2.5V regulator for digital core)
• 3.3V digital I/O pads with 5V tolerance
• Industry-standard LQFP-100 package (16 x 16mm)

Optional Value-added Software Features

• Cmedia vendor drivers supports USB Audio Class 2.0 and high-speed mode on Windows® XP, Windows® Vista, Windows® 7, Windows® 8 and Mac OS X 10.5.7 (or later) with Cmedia vendor drivers
• USB audio class 1.0 with full-speed/high-speed modes compatible with the Windows® XP, Windows® Vista, Windows® 7 and Windows® 8 UAA driver, Mac OS X and Linux embedded USB audio drivers
• For Windows, Cmedia drivers provide the following key features:                                 

             -Playback feedback endpoints to control data transmission accuracy and   maximize audio quality
             -Xear™ Pro
              *Support ASIO2.2 driver