wm8946

Manufacturer Part Numberwm8946
DescriptionStereo Low-power Codec With Video Buffer
ManufacturerWolfson Microelectronics plc
wm8946 datasheet
 
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Stereo Low-Power CODEC with Video Buffer
DESCRIPTION
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 and DAC signal paths simultaneously. The DSP
functions include 3D-stereo enhancement, notch filters, 5-band
EQ, dynamic range control and the Wolfson ReTune™ feature.
TM
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
TM
ReTune
algorithm can provide acoustic cancellation and
selective phase (delay) control of specific frequency bands.
The WM8946 is controlled via a I2C or SPI interface. Additional
functions include 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 WM8946 is supplied in 36-ball W-CSP package, ideal for
portable systems.
DCVDD
DBVDD
AUX1
AUX2
Analogue Mic
IN1L/ DMICDAT
Mux
PGA
/
IN2L
Analogue Mic
IN1R
Mux PGA
/
IN2R
DMICDAT
Digital Mic
Interface
DMICCLK
( GPIO )
MICBIAS
Reference
WOLFSON MICROELECTRONICS plc
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FEATURES
Hi-fi audio CODEC
-
94dB SNR during ADC recording (‘A’ weighted)
-
98dB 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)
-
ReTune
-
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 (2.96 x 3.06 x 0.7mm, 0.5mm pitch)
APPLICATIONS
Digital Still Cameras (DSC)
Multimedia phones
SPKVDD
VBIN
VBREFR
CURRENT MODE
VIDEO BUFFER
ADC L
DSP Core
ADC
(3 D surround,
Digital
Re- Tune EQ,
Filters
Dynamic Range
Control )
ADC R
DIGITAL AUDIO
INTERFACE
LDO
http://www.wolfsonmicro.com/enews
WM8946
TM
parametric filter
VBOUT
W
WM8946
LINEOUTL
DAC L
LINEOUTR
-1
OUTPUT
DAC
MIXERS
Digital
Filters
SPKOUTL
DAC R
SPKOUTR
-1
Digital Beep
Generator
CONTROL
FLL
GPIO
INTERFACE
Product Brief, October 2009, Rev 1.1
Copyright ©2009 Wolfson Microelectronics plc

wm8946 Summary of contents

  • Page 1

    ... ReTune algorithm can provide acoustic cancellation and selective phase (delay) control of specific frequency bands. The WM8946 is controlled via a I2C or SPI interface. Additional functions include 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 ...

  • Page 2

    ... WM8946 BLOCK DIAGRAM w Product Brief Product Brief, October 2009, Rev 1.1 2 ...

  • Page 3

    ... Product Brief PIN CONFIGURATION The WM8946 is supplied in a 36-pin CSP format. The pin configuration is illustrated below, showing the top-down view from above the chip SPKVDD B SPKOUTR C LINEOUTL D VBREFR E VBIN F MCLK ORDERING INFORMATION ORDER CODE TEMPERATURE RANGE WM8946ECS/R -40°C to +85°C ...

  • Page 4

    ... WM8946 PIN DESCRIPTION PIN NO NAME A1 SPKVDD A2 LDOVOUT A3 LDOVDD A4 VMIDC A5 DNC A6 DNC B1 SPKOUTR B2 SPKOUTL B3 GND B4 DNC B5 DNC B6 AUX1 C1 LINEOUTL C2 LINEOUTR C3 ADCDAT C4 MICBIAS C5 AUX2 C6 IN2L D1 VBREFR D2 VBOUT D3 CS ¯ ¯ /GPIO2 D4 IN1L/DMICDAT D5 IN1R D6 IN2R E1 VBIN E2 BCLK E3 LRCLK E4 SDOUT/GPIO4 E5 DCVDD E6 SDA F1 MCLK F2 DACDAT F3 GPIO1 ...

  • Page 5

    ... Storage temperature after soldering RECOMMENDED OPERATING CONDITIONS PARAMETER Digital supply range (Core) Digital supply range (I/O) Analogue supply Speaker supply range Ground w SYMBOL MIN DCVDD 1.71 DBVDD 1.71 LDOVDD 2.4 SPKVDD 1.71 GND WM8946 MIN MAX -0.3V 2.5V -0.3V 4.5V -0.3V DBVDD +0.7V -0.3V LDOVDD +0.7V -40ºC +85ºC -40ºC +150ºC -65ºC +150ºC TYP MAX UNIT 1 ...

  • Page 6

    ... WM8946 PACKAGE DIMENSIONS B: 36 BALL W-CSP PACKAGE 2.960 DETAIL 2 BOTTOM VIEW bbb Dimensions (mm) Symbols NOM MIN A 0.615 0.7 0.219 0.244 A1 A2 0.361 0.386 2.960 BSC D D1 2.500 BSC E 3.060 BSC E1 2.500 BSC e 0.500 BSC f1 0 ...

  • Page 7

    ... Wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by any person. ADDRESS: Wolfson Microelectronics plc 26 Westfield Road Edinburgh EH11 2QB United Kingdom Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: sales@wolfsonmicro.com w WM8946 Product Brief, October 2009, Rev 1.1 7 ...