wm8918 Wolfson Microelectronics plc, wm8918 Datasheet

wm8918

Manufacturer Part Number

wm8918

Description

Ultra Low Power Dac For Portable Audio Applications

Manufacturer

Wolfson Microelectronics plc

Datasheet

1.WM8918.pdf (175 pages)

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DESCRIPTION

The WM8918 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 headphone and

line outputs eliminate AC coupling capacitors, and both

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.

The analogue input stage can be configured for single

ended or differential inputs. Up to 3 stereo microphone or

line inputs may be connected. The input impedance is

constant with PGA gain setting.

A stereo digital microphone interface is provided, with a

choice of two inputs. The analogue or digital microphone

inputs can be mixed into the headphone or line output

paths.

A dynamic range controller provides compression and level

control to support a wide range of portable recording

applications in conjunction with the digital microphone

interface. Anti-clip and quick release features offer good

performance in the presence of loud impulsive noises.

ReTune

programmable coefficients is integrated for optimization of

speaker characteristics. Programmable dynamic range

control is also available for maximizing loudness, protecting

speakers from clipping and preventing premature shutdown

due to battery droop.

Common audio sampling frequencies are supported from a

wide range of external clocks, either directly or generated

via the FLL.

The WM8918 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.

WOLFSON MICROELECTRONICS plc

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FEATURES

•

APPLICATIONS

•

3.8mW quiescent power consumption for DAC to

headphone playback

DAC SNR 96dB typical, THD -86dB typical

2.4mW quiescent power consumption for analogue bypass

playback

Control write sequencer for pop minimised start-up and

shutdown

Single register write for default start-up sequence

Integrated FLL provides all necessary clocks

Stereo digital microphone input

3 single ended inputs per stereo channel

1 fully differential mic / line input per stereo channel

Digital Dynamic Range Controller (compressor / limiter)

Digital sidetone mixing

Ground-referenced headphone driver

Ground-referenced line outputs

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

Wireless headsets

Portable multimedia players

Handheld gaming

Self-clocking modes allow processor to sleep

All standard sample rates from 8kHz to 96kHz

Production Data, September 2010, Rev 4.0

WM8918

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