wm8946 Wolfson Microelectronics plc, wm8946 Datasheet

wm8946

Manufacturer Part Number

wm8946

Description

Stereo Low-power Codec With Video Buffer

Manufacturer

Wolfson Microelectronics plc

Datasheet

1.WM8946.pdf (7 pages)

Current page: 1 of 7
Download datasheet (322Kb)

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.

The ReTune

compensate for imperfect characteristics of the housing,

loudspeaker or microphone components in an application. The

ReTune

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.

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WOLFSON MICROELECTRONICS plc

IN1L/ DMICDAT

algorithm can provide acoustic cancellation and

MICBIAS

AUX1

AUX2

IN1R

IN2R

IN2L

feature is a sophisticated digital filter that can

Stereo Low-Power CODEC with Video Buffer

DMICCLK

DCVDD

( GPIO )

DMICDAT

Analogue Mic

DBVDD

Mux

Mux PGA

PGA

Reference

Digital Mic

Interface

http://www.wolfsonmicro.com/enews

SPKVDD

LDO

ADC R

ADC L

Filters

Digital

ADC

VBIN

DIGITAL AUDIO

INTERFACE

CURRENT MODE

VIDEO BUFFER

(3 D surround,

Re- Tune EQ,

Dynamic Range

DSP Core

FEATURES

•

APPLICATIONS

•

Control )

Hi-fi audio CODEC

6 analogue audio inputs

Integrated bias reference for electret microphones

2-channel digital microphone interface

Powerful digital mixing / DSP functions:

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)

Digital Still Cameras (DSC)

Multimedia phones

VBREFR

94dB SNR during ADC recording (‘A’ weighted)

98dB SNR during DAC playback (‘A’ weighted)

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

Filters

DAC

Digital Beep

Generator

FLL

VBOUT

DAC L

DAC R

parametric filter

INTERFACE

CONTROL

-1

Product Brief, October 2009, Rev 1.1

OUTPUT

MIXERS

WM8946

GPIO

WM8946

LINEOUTL

LINEOUTR

SPKOUTL

SPKOUTR

Related parts for wm8946

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 ...

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