D/A Converter with Integrated Class AB/D

The WM9081 is a mono D/A converter with an integrated Class AB/Class D amplifier that provides high power output at low distortion levels for portable applications. Mobile parametric EQ with fully programmable coefficients is integrated for optimization of speaker characteristics. Programmable dynamic range control is available for maximizing loudness and protecting speakers from clipping and preventing premature shutdown due to battery droop. Digital input enables the power drivers to be located close to the speakers in multi-channel systems eliminating the need for output filter components and reducing PCB track lengths while minimizing emissions. The digital input can also help to minimize crosstalk to the speaker output signal from high gain microphone inputs to enhance stability and reduce the risk of ‘howling’ during speakerphone operation.



Audio Amplifiers


  • Speaker common mode boost maximizes power for SPKVDD/AVDD ratios
  • Low power FLL provides all necessary internal clocks at 32 kHz to 27 MHz input frequency
  • All common sample rates from 8 to 96 kHz supported
  • Standard two-wire, three-wire, four-wire and hardware control modes
  • Data formats: LJ, RJ, I²S, DSP, all with TDM support
  • Thermal shutdown interrupt
  • Extended temp operating range: -40°C to 85°C

Parametric Specifications

Discontinued Product

Technical Documents

WM9081 Product Data Sheet

Jan 6, 2017, v4.0 : 2.3 Mb

WM9081 Product Flyer

Jan 1, 2009 : 1 Mb

6222 EV1 REV1 Schematic and Layout

Nov 1, 2008, v1.0 : 3.2 Mb

Design Resources

AN-0454 RC Snubber for Class-D Audio Amplifiers

Apr 3, 2018, AN0454 rev 1 : 683 Kb

WAN-0118 Guidelines

Sep 1, 2014, WAN_0118 rev 2.5 : 740 kb

WAN_0207 Wolfson Control Write Sequencer

Nov 1, 2010, WAN0207 rev 1.0 : 147 Kb

WAN_0204 WM9081 Control Write Sequencer Default Sequences

May 1, 2009, WAN0204 rev 1.1 : 160 Kb

Software and Tools


Jan 14, 2021, v3.12.0.5 : 43.2 Mb


Comprehensive Solutions