Power DAC. WM8912 Datasheet

WM8912 DAC. Datasheet pdf. Equivalent

WM8912 Datasheet
Recommendation WM8912 Datasheet
Part WM8912
Description Ultra Low Power DAC
Feature WM8912; w WM8912 Ultra Low Power DAC with Headphone Driver for Portable Audio Applications DESCRIPTION Th.
Manufacture Wolfson Microelectronics
Datasheet
Download WM8912 Datasheet




Wolfson Microelectronics WM8912
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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



Wolfson Microelectronics WM8912
WM8912
BLOCK DIAGRAM
Production Data
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PD, Rev 4.1, February 2013
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Wolfson Microelectronics WM8912
Production Data
TABLE OF CONTENTS
WM8912
DESCRIPTION....................................................................................................... 1 
FEATURES ............................................................................................................ 1 
APPLICATIONS..................................................................................................... 1 
BLOCK DIAGRAM ................................................................................................ 2 
TABLE OF CONTENTS......................................................................................... 3 
PIN CONFIGURATION .......................................................................................... 6 
ORDERING INFORMATION.................................................................................. 6 
PIN DESCRIPTION................................................................................................ 7 
ABSOLUTE MAXIMUM RATINGS ........................................................................ 8 
RECOMMENDED OPERATING CONDITIONS..................................................... 8 
ELECTRICAL CHARACTERISTICS ..................................................................... 9 
TERMINOLOGY .............................................................................................................. 9 
COMMON TEST CONDITIONS ...................................................................................... 9 
OUTPUT SIGNAL PATH ............................................................................................... 10 
CHARGE PUMP ............................................................................................................ 11 
FLL ................................................................................................................................ 11 
OTHER PARAMETERS ................................................................................................ 11 
POWER CONSUMPTION.................................................................................... 12 
COMMON TEST CONDITIONS .................................................................................... 12 
POWER CONSUMPTION MEASUREMENTS .............................................................. 13 
SIGNAL TIMING REQUIREMENTS .................................................................... 14 
COMMON TEST CONDITIONS .................................................................................... 14 
MASTER CLOCK .......................................................................................................... 14 
AUDIO INTERFACE TIMING ........................................................................................ 15 
MASTER MODE ............................................................................................................................................................ 15 
SLAVE MODE................................................................................................................................................................ 16 
CONTROL INTERFACE TIMING .................................................................................. 17 
DIGITAL FILTER CHARACTERISTICS .............................................................. 18 
DAC FILTER RESPONSES .......................................................................................... 19 
DE-EMPHASIS FILTER RESPONSES ......................................................................... 20 
DEVICE DESCRIPTION ...................................................................................... 21 
INTRODUCTION ........................................................................................................... 21 
DYNAMIC RANGE CONTROL (DRC)........................................................................... 22 
COMPRESSION/LIMITING CAPABILITIES .................................................................................................................. 22 
GAIN LIMITS.................................................................................................................................................................. 24 
DYNAMIC CHARACTERISTICS ................................................................................................................................... 24 
ANTI-CLIP CONTROL ................................................................................................................................................... 25 
QUICK RELEASE CONTROL ....................................................................................................................................... 26 
GAIN SMOOTHING ....................................................................................................................................................... 26 
INITIALISATION ............................................................................................................................................................ 27 
RETUNETM MOBILE PARAMETRIC EQUALIZER (EQ)................................................ 28 
DEFAULT MODE (5-BAND PARAMETRIC EQ) ........................................................................................................... 28 
RETUNETM MOBILE MODE........................................................................................................................................... 29 
EQ FILTER CHARACTERISTICS ................................................................................................................................. 29 
DIGITAL MIXING ........................................................................................................... 31 
DAC INTERFACE ROUTING AND CONTROL ............................................................................................................. 31 
DAC INTERFACE VOLUME BOOST ............................................................................................................................ 31 
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