WM8904 데이터 시트보기 (PDF) - Wolfson Microelectronics plc

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WM8904

Ultra Low Power CODEC for Portable Audio Applications

Wolfson Microelectronics plc 

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WM8904

Ultra Low Power CODEC for Portable Audio Applications

DESCRIPTION

The WM8904 is a high performance ultra-low power stereo

CODEC 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.

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. 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 WM8904 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

 3.0mW quiescent power consumption for DAC to

headphone playback

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

 ADC SNR 91dB typical, THD -80dB 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

- Self-clocking modes allow processor to sleep

- All standard sample rates from 8kHz to 96kHz

 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 (4 x 4mm, 0.4mm pitch)

 36-ball WLCSP package (2.6 x 2.5mm, 6 x 6 ball grid,

0.4mm pitch)

APPLICATIONS

 Portable multimedia players

 Multimedia handsets

 Handheld gaming

 Wireless headsets

 Mobile internet devices

 Netbooks

WOLFSON MICROELECTRONICS plc

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Pre-Production, September 2012, Rev 3.3

Copyright 2012 Wolfson Microelectronics plc

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