C0402C225M9PAC 데이터 시트보기 (PDF) - Wolfson Microelectronics plc
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C0402C225M9PAC Datasheet PDF : 178 Pages
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WM8903
Ultra Low Power CODEC for Portable Audio Applications
DESCRIPTION
The WM8903 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 outputs eliminate
headphone coupling capacitors. Both headphone and line
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 sequencer to reduce
software driver development and eliminate 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, which can
also be mixed with the mic/line signals at the output mixers.
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.
Common audio sampling frequencies are supported from a
range of external clocks, either directly or generated via the
Frequency Locked Loop (FLL).
The WM8903 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
4.5mW power consumption for DAC to headphone
playback
DAC SNR 96dB typical, THD -86dB typical
ADC SNR 92dB typical, THD -80dB typical
Control sequencer for pop minimised start-up and shut-
down
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
Stereo differential line driver for direct interface to WM9001
speaker driver
40-pin QFN package (5x5mm)
APPLICATIONS
Portable multimedia players
Multimedia handsets
Handheld gaming
WOLFSON MICROELECTRONICS plc
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Production Data, June 2012, Rev 4.5
Copyright 2012 Wolfson Microelectronics plc
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