CRD5381

The combination of the CS5381 Analog-to-Digital Converter and CS8421 Asynchronous Sample Rate Converter creates an analog-to-digital conversion system with an asynchronous digital decimation filter that is virtually immune to interface or network jitter. In addition, the CS8421 adds a multi-channel Time Division Multiplexed (TDM) output format option. These unique features address many of the issues and design challenges associated with networked audio systems and other high-performance applications. In addition to the standard 24-bit audio data, the CS8421 adds the functionality to output properly dithered 32, 20, or 16-bit data.The CRD5381 was designed as a platform for easy evaluation of the jitter rejection, sample rate conversion, and time-division multiplexing capabilities of the CS8421 in the context of a A/D conversion system with an asynchronous decimation filter. The CRD5381 accepts four channels of balanced, analog audio input and provides four channels of PCM data output. The data output can be either a four-channel TDM format or two independent stereo left-justified data outputs. The PCM data output is synchronous to the serial left-right clock and bit clock that the user supplies. The CRD5381 also provides status indicators including ADC overflow and SRC unlock, and it accepts an external reset signal. The only system power requirements for the design include +/- 12 Volts and +3.3 Volts. The required input signals are a left/right or word clock and serial clock for the audio data output.

• Advanced Multi-bit Delta-sigma Architecture
• 125 dB Stop-band Rejection
• Output Sample Rate Determined by Input Word, Left/Right, or Fsync Clock