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WM8912 Schematic ( PDF Datasheet ) - Wolfson Microelectronics

Teilenummer WM8912
Beschreibung Ultra Low Power DAC
Hersteller Wolfson Microelectronics
Logo Wolfson Microelectronics Logo 




Gesamt 30 Seiten
WM8912 Datasheet, Funktion
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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 ‘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. 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 Wolfson’s 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
3.8mW quiescent power consumption for DAC to
headphone playback
DAC SNR 96dB typical, THD -86dB typical
Class W ground-referenced headphone driver
- 28mW per channel into 30at <1% THD
- 32mW per channel into 15at <1% THD
Dynamic range controller
ReTune™ Mobile parametric equalizer
Integrated control write sequencer for pop minimised start-
up and shutdown
Single register write for default start-up and shutdown
sequences
On-chip FLL provides all necessary clocks
DAC supports standard sample rates from 8kHz to 96kHz
32-pin QFN package (4x4mm, 0.4mm pitch)
APPLICATIONS
Portable multimedia players
Multimedia handsets
Handheld gaming
WOLFSON MICROELECTRONICS plc
Production Data, February 2013, Rev 4.1
Copyright 2013 Wolfson Microelectronics plc






WM8912 Datasheet, Funktion
WM8912
PIN CONFIGURATION
The WM8912 is supplied in a 32-pin QFN package.
Production Data
ORDERING INFORMATION
DEVICE
WM8912CGEFL/V
TEMPERATURE
RANGE
-40°C to +85°C
WM8912CGEFL/RV -40°C to +85°C
Note:
Reel quantity = 3,500
PACKAGE
32-lead QFN
(4x4x0.4mm, lead-free)
32-lead QFN
(4x4x0.4mm, lead-free, tape and reel)
MOISTURE
SENSITIVITY
LEVEL
MSL3
MSL3
PEAK
SOLDERING
TEMPERATURE
260°C
260°C
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PD, Rev 4.1, February 2013
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WM8912 pdf, datenblatt
WM8912
Production Data
POWER CONSUMPTION
The WM8912 power consumption is dependent on many parameters. Most significantly, it depends
on supply voltages, sample rates, mode of operation, and output loading.
The power consumption on each supply rail varies approximately with the square of the voltage.
Power consumption is greater at fast sample rates than at slower ones. When the digital audio
interface is operating in Master mode, the DBVDD current is significantly greater than in Slave mode.
(Note also that power savings can be made by using MCLK as the BCLK source in Slave mode.) The
output load conditions (impedance, capacitance and inductance) can also impact significantly on the
device power consumption.
COMMON TEST CONDITIONS
Unless otherwise stated, the following test conditions apply throughout the following sections:
Ambient temperature = +25°C
Audio signal = quiescent (zero amplitude)
Sample rate = 48kHz
MCLK = 12.288MHz
Audio interface mode = Slave (LRCLK_DIR=0, BCLK_DIR=0)
SYSCLK_SRC = 0 (system clock comes direct from MCLK, not from FLL)
Additional, variant test conditions are quoted within the relevant sections below. Where applicable,
power dissipated in the headphone or line loads is included.
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PD, Rev 4.1, February 2013
12

12 Page





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