D/A Converter with Integrated Class AB/D Amplifier

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.

Technology

Audio Amplifiers

Features

  • 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

Input Type Analog;
I²S
Channels Headphone Driver;
1 x Mono Class AB/D;
Speaker Driver
Output Power (V) 2.6 W into 4 ohm
SNR (dB) 92
THD+N @ 1 W (dB) 0.03
Power Supply (V) 2.7-5.5
Analog Power Supply (V) 2.7-3.6
Supply Current (µA) 1.71-3.6
Package 28 QFN

Technical Documents

WM9081 Product Data Sheet

Jan 6, 2017, v4.0 : 2.3 Mb

WM9081 Product Flyer

Jan 1, 2009 : 1000 Kb

6222 EV1 REV1 Schematic and Layout

Nov 1, 2008, v1.0 : 3200 Kb

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