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WM8773

24-bit, 96kHz ADC with 8 Channel I/P Multiplexer

DESCRIPTION

The WM8773 is a high performance, stereo audio ADC with

an 8 channel input selector. The WM8773 is ideal for

digitising multiple analogue sources for surround sound

processing applications for home hi-fi, automotive and other

audio visual equipment.

A stereo 24-bit multi-bit sigma delta ADC is used with an

eight stereo channel input selector. Each channel has

analogue domain mute and programmable gain control.

Digital audio output word lengths from 16-32 bits and

sampling rates from 8kHz to 96kHz are supported.

The audio data interface supports I

2

S, left justified, right

justified and DSP digital audio formats.

The device is controlled via a 3 wire serial interface. The

interface provides access to all features including channel

selection, volume controls, mutes, de-emphasis and power

management facilities. The device is available in a 64-pin

TQFP package.

FEATURES

鈥?/div>

Audio Performance

鈭?/div>

102dB SNR (鈥楢鈥?weighted @ 48kHz) ADC

ADC Sampling Frequency: 8kHz 鈥?96kHz

3-Wire SPI MPU Serial Control Interface

Master or Slave Clocking Mode

Programmable Audio Data Interface Modes

鈭?/div>

鈥?/div>

I

2

S, Left, Right Justified or DSP

鈭?/div>

16/20/24/32 bit Word Lengths

Analogue Record Monitor Outputs

Eight stereo ADC inputs with analogue gain adjust from

+19dB to 鈥?2dB in 1dB steps

2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply

Operation

5V tolerant digital inputs

APPLICATIONS

鈥?/div>

Surround Sound AV Processors and Hi-Fi systems

Automotive Audio

BLOCK DIAGRAM

VMIDADC

AINVGR

AGND1

AVDD1

REFADC

AINVGL

AIN1L

AIN1R

AIN2L

AIN2R

AIN3L

AIN3R

AIN4L

AIN4R

AIN5L

AIN5R

AIN6L

AIN6R

AIN7L

AIN7R

AIN8L

AIN8R

WM8773

INPUT SOURCE SELECTOR

AUDIO INTERFACE

STEREO

ADC

AND

DIGITAL FILTERS

MCLK

DOUT

ADCLRC

BCLK

AINOPL

AINOPR

RECL

RECR

MUTE

CONTROL INTERFACE

CL

CE

DGND

DVDD

WOLFSON MICROELECTRONICS LTD

w :: www.wolfsonmicro.com

RESETB

DI

Product Preview, April 2002, Rev 1.0

Copyright

餂?002

Wolfson Microelectronics Ltd.

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WM8773 Datasheet

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