Low-Power CODEC. WM8946 Datasheet

WM8946 CODEC. Datasheet pdf. Equivalent

Part WM8946
Description Stereo Low-Power CODEC
Feature WM8946 Stereo Low-Power CODEC with Video Buffer DESCRIPTION FEATURES The WM8946 is a highly inte.
Manufacture Cirrus Logic
Datasheet
Download WM8946 Datasheet



WM8946
WM8946
Stereo Low-Power CODEC with Video Buffer
DESCRIPTION
FEATURES
The WM8946 is a highly integrated low power hi-fi CODEC
designed for portable devices such as digital still cameras.
Up to 6 analogue inputs may be connected; a 2-channel 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. Twin stereo outputs or stereo line and mono BTL
headphone/speaker drive may be 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 3D-stereo
enhancement, 5 notch filters, 5-band EQ, dynamic range control
and the ReTune™ feature.
The ReTunefeature is a sophisticated digital filter that can
compensate for imperfect characteristics of the housing,
loudspeaker or microphone components in an application. The
ReTunealgorithm can provide acoustic equalisation and
selective phase (delay) control of specific frequency bands.
The WM8946 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 WM8946 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)
6 analogue audio inputs
Integrated bias reference for electret microphones
2-channel digital microphone interface
Powerful digital mixing / DSP functions:
- 3D-stereo enhancement
- 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
Digital beep generator
4 analogue audio outputs
Stereo 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
36-ball W-CSP package (2.97 x 3.07 x 0.7mm, 0.5mm pitch)
APPLICATIONS
Digital Still Cameras (DSC)
Multimedia phones
DCVDD DBVDD
SPKVDD
VBIN
VBREFR VBOUT
CURRENT MODE
VIDEO BUFFER
WM8946
AUX1
AUX2
IN1L/DMICDAT
IN2L
Analogue Mic
Mux / PGA
IN1R
IN2R
Analogue Mic
Mux / PGA
DMICDAT
DMICCLK
(GPIO)
Digital Mic
Interface
ADC L
ADC R
ADC /
Record
Digital
Filters
DSP Core
(3D surround,
Re-Tune EQ,
Dynamic Range
Control)
DAC
Digital
Filters
DAC L
DAC R
Digital Beep
Generator
-1
-1
OUTPUT
MIXERS
LINEOUTL
LINEOUTR
SPKOUTL
SPKOUTR
MICBIAS
Reference
LDO
DIGITAL AUDIO
INTERFACE
FLL
CONTROL
INTERFACE
GPIO
http://www.cirrus.com
Copyright Cirrus Logic, Inc., 20102016
(All Rights Reserved)
Rev 4.5
MAY ‘16



WM8946
WM8946
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
INPUT PATH / OUTPUT PATH 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 ............................................................................................... 22
INTRODUCTION ...................................................................................................................... 22
ANALOGUE INPUT SIGNAL PATH ......................................................................................... 23
INPUT PGA ENABLE ....................................................................................................................................................................24
INPUT PGA CONFIGURATION ....................................................................................................................................................24
MICROPHONE BIAS CONTROL ..................................................................................................................................................25
INPUT PGA GAIN CONTROL .......................................................................................................................................................25
DIGITAL MICROPHONE INTERFACE .................................................................................... 28
ANALOGUE-TO-DIGITAL CONVERTER (ADC)...................................................................... 29
ADC VOLUME CONTROL.............................................................................................................................................................30
ADC HIGH PASS FILTER .............................................................................................................................................................32
DSP CORE............................................................................................................................... 33
DSP CONFIGURATION MODES ..................................................................................................................................................33
LOW-PASS / HIGH-PASS FILTER (LPF/HPF)..............................................................................................................................34
3D SURROUND.............................................................................................................................................................................35
5-NOTCH FILTER..........................................................................................................................................................................36
DF1 FILTER...................................................................................................................................................................................37
RETUNETM FILTER........................................................................................................................................................................37
5-BAND EQ....................................................................................................................................................................................38
DYNAMIC RANGE CONTROL (DRC) ...........................................................................................................................................38
SIGNAL ENHANCEMENT REGISTER CONTROLS.....................................................................................................................39
DYNAMIC RANGE CONTROL (DRC) ..................................................................................... 40
DRC COMPRESSION / EXPANSION / LIMITING.........................................................................................................................41
GAIN LIMITS..................................................................................................................................................................................43
GAIN READBACK .........................................................................................................................................................................44
DYNAMIC CHARACTERISTICS ...................................................................................................................................................44
2 Rev 4.5





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