WM8728: Stereo DAC and volume control


The WM8728 is a high performance stereo DAC designed for audio applications such as DVD, home theatre systems, and digital TV. The WM8728 supports PCM data input word lengths from 16 to 32-bits and sampling rates up to 192kHz. The WM8728 consists of a serial interface port, digital interpolation filters, multi-bit sigma delta modulators and stereo DAC in a small 20-lead SSOP package. The WM8728 also includes a digitally controllable mute and attenuate function for each channel.

The WM8728 supports a variety of connection schemes for audio DAC control. The 2 or 3-wire MPU serial port provides access to a wide range of features including on-chip mute, attenuation and phase reversal. A hardware controllable interface is also available

The WM8728 is an ideal device to interface to AC-3™, DTS™, and MPEG audio decoders for surround sound applications, or for use in DVD players supporting DVD-A.


  • Stereo DAC with 24 bit PCM
  • Audio Performance
  • -   106dB SNR (‘A’ weighted @ 48kHz) DAC
  • -   -97dB THD
  • DAC Sampling Frequency: 8kHz - 192kHz
  • 2 or 3-Wire Serial Control Interface or Hardware Control
  • Programmable Audio Data Interface Modes
  • -   I2S, Left, Right Justified, DSP
  • -   16/20/24/32 bit Word Lengths
  • Independent Digital Volume Control on Each Channel with 127.5dB Range in 0.5dB Steps
  • 3.0V - 5.5V Supply Operation
  • 20-lead SSOP Package
  • Exceeds Dolby Class A Performance Requirements