wm8918 Wolfson Microelectronics plc, wm8918 Datasheet
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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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Ultra Low Power DAC for Portable Audio Applications
Mobile 5-band parametric equaliser with fully
at
http://www.wolfsonmicro.com/enews
FEATURES
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APPLICATIONS
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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
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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
Copyright ©2010 Wolfson Microelectronics plc
Production Data, September 2010, Rev 4.0
WM8918
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