WM8945 Datasheet, PDF (1/169 Pages) Wolfson Microelectronics plc – Mono Low-Power CODEC with Video Buffer and Touch Panel Controller

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WM8945
Mono Low-Power CODEC with
Video Buffer and Touch Panel Controller
DESCRIPTION
FEATURES
The WM8945 is a highly integrated low power hi-fi CODEC
designed for portable devices such as digital still cameras.
Up to 4 analogue inputs may be connected; a digital microphone
interface is also provided. Flexible output mixing options support
single-ended and differential configurations, with outputs derived
from the digital audio paths or from analogue bypass paths.
Mono line output and mono BTL headphone/speaker drive is
supported.
Flexible digital mixing and powerful DSP functions are available.
Programmable filters and other processes may be applied to the
ADC or DAC signal paths. The DSP functions include 5 notch
filters, 5-band EQ, dynamic range control and the Wolfson
ReTune™ feature.
The ReTune™ feature is a sophisticated digital filter that can
compensate for imperfect characteristics of the housing,
loudspeaker or microphone components in an application. The
ReTune™ algorithm can provide acoustic equalisation and
selective phase (delay) control of specific frequency bands.
The WM8945 is controlled via an I2C or SPI interface. Additional
functions include 4-wire Touch Panel controller, Auxiliary ADC,
Digital beep generator, Video buffer, programmable GPIO
functions, Frequency Locked Loop (FLL) for flexible clocking
support and integrated LDO for low noise supply regulation.
The WM8945 is supplied in 36-ball W-CSP package, ideal for
portable systems.
 Hi-fi audio CODEC
- 94dB SNR during ADC recording (‘A’ weighted)
- 96dB SNR during DAC playback (‘A’ weighted)
 4 analogue audio inputs
 Integrated bias reference for electret microphones
 Digital microphone interface
 Powerful digital mixing / DSP functions:
- 5-notch filters
- 5-band equalizer (EQ)
- ReTune™ parametric filter
- Dynamic range control and noise gate
- Low-pass/High-pass filters
- Direct Form 1 (DF1) programmable digital filter
 Digital beep generator
 Mono line output
 Mono BTL headphone/speaker output driver
 I2S digital audio interface - sample rates 8kHz to 48kHz
 Frequency Locked Loop (FLL) frequency conversion / filter
 Video buffer function
 4-wire Touch Panel interface controller
 Auxiliary ADC for DC measurement or battery monitoring
 Integrated LDO low-noise voltage regulator
 36-ball W-CSP package (2.96 x 3.06 x 0.7mm, 0.5mm pitch)
APPLICATIONS
 Digital Still Cameras (DSC)
 Multimedia phones
DCVDD DBVDD
XP
YN
TOUCH PANEL
YP
INTERFACE
XN
SPKVDD
AUX ADC
VBIN
VBREFR VBOUT
CURRENT MODE
VIDEO BUFFER
W
WM8945
AUX1
AUX2
IN1L/DMICDAT
IN2L
Analogue Mic
Mux / PGA
DMICDAT
DMICCLK
(GPIO)
Digital Mic
Interface
ADC L
DAC L
-1
ADC /
Record
Digital
Filters
DSP Core
(Re-Tune EQ,
Dynamic Range
Control)
DAC
Digital
Filters
OUTPUT
MIXERS
LINEOUTL
SPKOUTL
SPKOUTR
Digital Beep
Generator
MICBIAS
Reference
LDO
DIGITAL AUDIO
INTERFACE
FLL
CONTROL
INTERFACE
GPIO
WOLFSON MICROELECTRONICS plc
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Production Data, May 2011, Rev 4.1
Copyright 2011 Wolfson Microelectronics plc