WM8581: Multi CODEC with S/PDIF transceiver


The WM8581 is a multi-channel audio CODEC with S/PDIF transceiver. The WM8581 is ideal for DVD and surround sound processing applications for home hi-fi, automotive and other audiovisual equipment.

Integrated into the device is a stereo 24-bit multi-bit sigma delta ADC with support for digital audio output word lengths from 16-bit to 32-bit, and sampling rates from 8kHz to 192kHz.

Also included are four stereo 24-bit multi-bit sigma delta DACs, each with a dedicated oversampling digital interpolation filter. Digital audio input word lengths from 16-bits to 32-bits and sampling rates from 8kHz to 192kHz are supported. Each DAC channel has independent digital volume and mute control.

Two independent audio data interfaces support I2S, Left Justified, Right Justified and DSP digital audio formats. Each audio interface can operate in either Master Mode or Slave Mode.

The S/PDIF transceiver is IEC-60958-3 compatible and supports frame rates from 32k/s to 192k/s. It has four multiplexed inputs and one output. Status and error monitoring is built-in and results can reported over the serial interface or via GPO pins. S/PDIF Channel Block configuration is also supported.

The device has two PLLs that can be configured independently to generate two system clocks for internal or external use.

Device control and setup is via a 2-wire or 3-wire (SPI compatible) serial interface. The serial interface provides access to all features including channel selection, volume controls, mutes, de-emphasis, S/PDIF control/status, and power management facilities. Alternatively, the device has a Hardware Control Mode where device features can be enabled/disabled using selected pins.

The device is available in a 48-lead TQFP package.


  • Mutli-channel CODEC with 4 Stereo DACs and 1 Stereo ADC
  • Integrated S/PDIF / IEC-60958-3 transceiver
  • Audio Performance
  • 103dB SNR (’A’ weighted @ 48kHz) DAC
  • -90dB THD (48kHz) DAC
  • 100dB SNR (’A’ weighted @ 48kHz) ADC
  • -90dB THD (48kHz) ADC
  • DAC Sampling Frequency: 8kHz - 192kHz
  • ADC Sampling Frequency: 8kHz - 192kHz
  • Independent ADC and DAC Sample Rates
  • 2 and 3-Wire Serial Control Interface with readback, or Hardware Control Interface
  • GPO pins allow visibility of user selected status flags
  • Programmable Audio Data Interface Modes
  • I2S, Left, Right Justified or DSP
  • 16/20/24/32 bit Word Lengths
  • Four independent stereo DAC outputs with independent digital volume controls
  • Two Independent Master or Slave Audio Data Interfaces
  • Flexible Digital Interface Routing with Clock Selection Control
  • 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital Supply Operation
  • 48-lead TQFP Package