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WM8904ECS/R 参数 Datasheet PDF下载

WM8904ECS/R图片预览
型号: WM8904ECS/R
PDF下载: 下载PDF文件 查看货源
内容描述: 超低功耗编解码器用于便携式音频应用 [Ultra Low Power CODEC for Portable Audio Applications]
分类和应用: 解码器编解码器便携式
文件页数/大小: 188 页 / 1824 K
品牌: WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
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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.
ReTune
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.
TM
WM8904
Ultra Low Power CODEC for Portable Audio Applications
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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http://www.wolfsonmicro.com/enews
Pre-Production, September 2012, Rev 3.3
Copyright
2012
Wolfson Microelectronics plc