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WM8912GEFL

Ultra Low Power DAC with Headphone Driver for Portable Audio Applications

Wolfson Microelectronics plc 

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WM8912

Ultra Low Power DAC with Headphone Driver

for Portable Audio Applications

DESCRIPTION

The WM8912 is a high performance ultra-low power stereo

DAC optimised for portable audio applications.

The device features stereo ground-referenced headphone

amplifiers using the Wolfson ‘Class-W’ amplifier techniques

- incorporating an innovative dual-mode charge pump

architecture - to optimise efficiency and power consumption

during playback. The ground-referenced outputs eliminate

headphone coupling capacitors. The outputs include

common mode feedback paths to reject ground noise.

Control sequences for audio path setup can be pre-loaded

and executed by an integrated control write sequencer to

reduce software driver development and minimise pops and

clicks via Wolfson’s SilentSwitch™ technology.

A dynamic range controller provides compression and level

control to support a wide range of portable recording

applications. Anti-clip and quick release features offer good

performance in the presence of loud impulsive noises.

ReTuneTM Mobile 5-band parametric equaliser with fully

programmable coefficients is integrated for optimization of

speaker characteristics.

Common audio sampling frequencies are supported from a

wide range of external clocks, either directly or generated

using the integrated FLL.

The WM8912 can operate directly from a single 1.8V

switched supply. For optimal power consumption, the digital

core can be operated from a 1.0V supply.

FEATURES

• 3.8mW quiescent power consumption for DAC to

headphone playback

• DAC SNR 96dB typical, THD -86dB typical

• Class W ground-referenced headphone driver

- 28mW per channel into 30Ω at <1% THD

- 32mW per channel into 15Ω at <1% THD

• Dynamic range controller

• ReTune™ Mobile parametric equalizer

• Integrated control write sequencer for pop minimised start-

up and shutdown

• Single register write for default start-up and shutdown

sequences

• On-chip FLL provides all necessary clocks

• DAC supports standard sample rates from 8kHz to 96kHz

• 32-pin QFN package (4x4mm, 0.4mm pitch)

APPLICATIONS

• Portable multimedia players

• Multimedia handsets

• Handheld gaming

WOLFSON MICROELECTRONICS plc

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Production Data, September 2010, Rev 4.0

Copyright ©2010 Wolfson Microelectronics plc

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