WM8771
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24-bit, 192kHz 8-Channel Codec
DESCRIPTION
FEATURES
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Audio Performance
The WM8771 is a high performance, multi-channel audio
codec. The WM8771 is ideal for surround sound processing
applications for home hi-fi, automotive and other audio
visual equipment.
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108dB SNR (‘A’ weighted @ 48kHz) DAC
97dB SNR (‘A’ weighted @ 48kHz) ADC
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•
•
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DAC Sampling Frequency: 8kHz – 192kHz
ADC Sampling Frequecncy: 8kHz – 96kHz
3-Wire SPI or CCB MPU Serial Control Interface
Master or Slave Clocking Mode
A stereo 24-bit multi-bit sigma delta ADC is used with a
three 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.
Programmable Audio Data Interface Modes
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I2S, Left, Right Justified or DSP
Four stereo 24-bit multi-bit sigma delta DACs are used with
oversampling digital interpolation filters. Digital audio input
word lengths from 16-32 bits and sampling rates from 8kHz
to 192kHz are supported. Each DAC channel has
independent digital attenuation and mute control. The audio
data interface supports I2S, left justified, right justified and
DSP digital audio formats.
16/20/24/32 bit Word Lengths
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Four Independent Stereo DAC Audio Outputs
Eight stereo ADC inputs with analogue gain adjust from
+19dB to –12dB in 1dB steps
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2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply
Operation
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5V tolerant digital inputs
64-Pin TQFP Package
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.
APPLICATIONS
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Surround Sound Processors
Automotive Audio
BLOCK DIAGRAM
AIN1L
AIN1R
VOUT1L
VOUT1R
LOW
PASS
FILTERS
DIGITAL
FILTERS
STEREO
DAC
AIN2L
AIN2R
AIN3L
AIN3R
VOUT2L
VOUT2R
LOW
PASS
FILTERS
AIN4L
AIN4R
DIGITAL
FILTERS
STEREO
DAC
AUDIO INTERFACE
&
AIN5L
AIN5R
STEREO
ADC
AIN6L
AIN6R
VOUT3L
VOUT3R
DIGITAL FILTERS
LOW
PASS
FILTERS
DIGITAL
FILTERS
STEREO
DAC
AIN7L
AIN7R
AIN8L
AIN8R
VOUT4L
VOUT4R
LOW
PASS
FILTERS
DIGITAL
FILTERS
STEREO
DAC
AINOPL
AINOPR
REC1L
REC1R
MUTE
MUTE
MUTE
CONTROL INTERFACE
REC2L
REC2R
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REC3L
REC3R
WM8771
CCB is a trademark of SANYO ELECTRIC CO., LTD
CCB is SANYO’s original bus format and all the bus addresses are controlled by SANYO.
WOLFSON MICROELECTRONICS LTD
Product Preview, December 2001, Rev 2.0
Copyright 2001 Wolfson Microelectronics Ltd.
w :: www.wolfsonmicro.com