WM8944B Datasheet, PDF (1/165 Pages) Cirrus Logic – Mono Low-Power CODEC with Video Buffer

WM8944B
Mono Low-Power CODEC with Video Buffer
DESCRIPTION
The WM8944B is a highly integrated low power hi-fi CODEC
designed for portable devices such as digital still cameras.
Up to 2 analogue inputs may be connected; a stereo 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 and DAC signal paths simultaneously. The
DSP functions include 5 notch filters, 5-band EQ, dynamic
range control and the 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 WM8944B is controlled via a I2C or SPI interface.
Additional functions include 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 WM8944B is supplied in 25-ball W-CSP package, ideal
for portable systems.
DCVDD DBVDD
SPKVDD
VBIN
FEATURES
 Hi-fi audio CODEC
- 94dB SNR during ADC recording (‘A’ weighted)
- 96dB SNR during DAC playback (‘A’ weighted)
 2 analogue audio inputs
 Integrated bias reference for electret microphones
 Digital microphone interface (Stereo)
 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
- 3D stereo enhancement (for digital mic input)
 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
 Integrated LDO low-noise voltage regulator
 25-ball W-CSP package (2.41 x 2.41 x 0.55mm, 0.5mm pitch)
APPLICATIONS
 Digital Still Cameras (DSC)
 Multimedia phones
VBREFR VBOUT
CURRENT MODE
VIDEO BUFFER
WM8944B
AUX
IN1/DMICDAT
Analogue Mic
Mux / PGA
DMICDAT
DMICCLK
(GPIO)
Digital Mic
Interface
ADC L
DAC L
ADC /
Record
Digital
Filters
DSP Core
(L/HPF, 3D
Surround,
5-notch filter,
Re-Tune EQ,
Dynamic Range
DAC
Digital
Filters
-1
Control)
OUTPUT
MIXERS
LINEOUT
SPKOUTP
SPKOUTN
Digital Beep
Generator
MICBIAS
Reference
LDO
DIGITAL AUDIO
INTERFACE
FLL
CONTROL
INTERFACE
GPIO
http://www.cirrus.com
Copyright  Cirrus Logic, Inc., 2010–2016
(All Rights Reserved)
Rev 4.3
NOV ‘16