Low-Power CODEC. WM8944B Datasheet

WM8944B CODEC. Datasheet pdf. Equivalent

Part WM8944B
Description Mono Low-Power CODEC
Feature WM8944B Mono Low-Power CODEC with Video Buffer DESCRIPTION The WM8944B is a highly integrated low.
Manufacture Cirrus Logic
Datasheet
Download WM8944B Datasheet



WM8944B
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)
- ReTuneparametric 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
ADC /
Record
Digital
Filters
DSP Core
(L/HPF, 3D
Surround,
5-notch filter,
Re-Tune EQ,
Dynamic Range
Control)
DAC
Digital
Filters
DAC L
-1
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., 20102018
(All Rights Reserved)
Rev 4.4
JUL ‘18



WM8944B
WM8944B
TABLE OF CONTENTS
DESCRIPTION................................................................................................................ 1
FEATURES ..................................................................................................................... 1
APPLICATIONS.............................................................................................................. 1
TABLE OF CONTENTS.................................................................................................. 2
BLOCK DIAGRAM ......................................................................................................... 5
PIN CONFIGURATION ................................................................................................... 6
ORDERING INFORMATION........................................................................................... 6
PIN DESCRIPTION......................................................................................................... 7
ABSOLUTE MAXIMUM RATINGS ................................................................................. 8
RECOMMENDED OPERATING CONDITIONS.............................................................. 8
THERMAL PERFORMANCE.......................................................................................... 9
ELECTRICAL CHARACTERISTICS ............................................................................ 10
TERMINOLOGY ....................................................................................................................... 13
TYPICAL PERFORMANCE .......................................................................................... 14
TYPICAL POWER CONSUMPTION ........................................................................................ 15
AUDIO SIGNAL PATHS DIAGRAM ............................................................................. 16
SIGNAL TIMING REQUIREMENTS ............................................................................. 17
SYSTEM CLOCK TIMING........................................................................................................ 17
AUDIO INTERFACE TIMING ................................................................................................... 17
MASTER MODE ............................................................................................................................................................................17
SLAVE MODE................................................................................................................................................................................18
CONTROL INTERFACE TIMING ............................................................................................. 19
DEVICE DESCRIPTION ............................................................................................... 21
INTRODUCTION ...................................................................................................................... 21
ANALOGUE INPUT SIGNAL PATH ......................................................................................... 22
INPUT PGA ENABLE ....................................................................................................................................................................22
INPUT PGA CONFIGURATION ....................................................................................................................................................23
MICROPHONE BIAS CONTROL ..................................................................................................................................................23
INPUT PGA GAIN CONTROL .......................................................................................................................................................24
DIGITAL MICROPHONE INTERFACE .................................................................................... 26
ANALOGUE-TO-DIGITAL CONVERTER (ADC)...................................................................... 27
ADC VOLUME CONTROL.............................................................................................................................................................28
ADC HIGH PASS FILTER .............................................................................................................................................................30
DSP CORE............................................................................................................................... 31
DSP CONFIGURATION MODES ..................................................................................................................................................31
LOW-PASS / HIGH-PASS FILTER (LPF/HPF)..............................................................................................................................32
3D SURROUND.............................................................................................................................................................................33
5-NOTCH FILTER..........................................................................................................................................................................34
DF1 FILTER...................................................................................................................................................................................35
HPF................................................................................................................................................................................................35
RETUNE FILTER...........................................................................................................................................................................36
5-BAND EQ....................................................................................................................................................................................36
DYNAMIC RANGE CONTROL (DRC) ...........................................................................................................................................37
SIGNAL ENHANCEMENT REGISTER CONTROLS.....................................................................................................................37
DYNAMIC RANGE CONTROL (DRC) ..................................................................................... 38
DRC COMPRESSION / EXPANSION / LIMITING.........................................................................................................................39
GAIN LIMITS..................................................................................................................................................................................43
GAIN READBACK .........................................................................................................................................................................44
DYNAMIC CHARACTERISTICS ...................................................................................................................................................45
ANTI-CLIP CONTROL ...................................................................................................................................................................46
2 Rev 4.4





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