|
WM8912 Datasheet, PDF (1/129 Pages) Wolfson Microelectronics plc – Ultra Low Power DAC with Headphone Driver for Portable Audio Applications | |||
|
w
WM8912
Ultra Low Power DAC with Headphone Driver
for Portable Audio Applications
DESCRIPTION
The WM8912 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 âClass-Wâ 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. The 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 Wolfsonâs SilentSwitch⢠technology.
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.
Common audio sampling frequencies are supported from a
wide range of external clocks, either directly or generated
using the integrated FLL.
The WM8912 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
ï· 3.8mW quiescent power consumption for DAC to
headphone playback
ï· DAC SNR 96dB typical, THD -86dB typical
ï· Class W ground-referenced headphone driver
- 28mW per channel into 30ï at <1% THD
- 32mW per channel into 15ï at <1% THD
ï· Dynamic range controller
ï· ReTune⢠Mobile parametric equalizer
ï· Integrated control write sequencer for pop minimised start-
up and shutdown
ï· Single register write for default start-up and shutdown
sequences
ï· On-chip FLL provides all necessary clocks
ï· DAC supports standard sample rates from 8kHz to 96kHz
ï· 32-pin QFN package (4x4mm, 0.4mm pitch)
APPLICATIONS
ï· Portable multimedia players
ï· Multimedia handsets
ï· Handheld gaming
WOLFSON MICROELECTRONICS plc
Production Data, February 2013, Rev 4.1
Copyright ï2013 Wolfson Microelectronics plc
|
▷ |