WM8772
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24-bit, 192kHz 6-Channel Codec with Volume Control
DESCRIPTION
FEATURES
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Audio Performance
The WM8772 is a multi-channel audio codec ideal for DVD
and surround sound processing applications for home hi-fi,
automotive and other audio visual equipment.
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−
103dB SNR (‘A’ weighted @ 48kHz) DAC
100dB SNR (‘A’ weighted @ 48kHz) ADC (TQFP)
•
•
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DAC Sampling Frequency: 8kHz – 192kHz
ADC Sampling Frequency: 32kHz – 96kHz
A stereo 24-bit multi-bit sigma delta ADC is used. Digital
audio output word lengths from 16-32 bits and sampling
rates from 32kHz to 96kHz are supported. The 32-lead
version allows separate ADC and DAC samples rates.
ADC and DAC can run at different sample rates (32 pin
TQFP version only)
•
•
3-Wire SPI Serial or Hardware Control Interface
Programmable Audio Data Interface Modes
Three 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 volume and mute control.
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I2S, Left, Right Justified or DSP
16/20/24/32 bit Word Lengths
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Three Independent stereo DAC outputs with independent
digital volume controls
The audio data interface supports I2S, left justified, right
justified and DSP digital audio formats.
•
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Master or Slave Audio Data Interface
2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply
Operation
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 28-pin
SSOP or 32 pin TQFP.
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28 pin SSOP or 32 pin TQFP Package
APPLICATIONS
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DVD Players
Surround Sound AV Processors and Hi-Fi systems
Automotive Audio
BLOCK DIAGRAM - 28 PIN SSOP
VREFNVREFP
LOW
PASS
FILTER
VOUT1L
VOUT1R
STEREO
DAC
VREFN
AUDIO
INTERFACE
AINL
AINR
VOUT2L
VOUT2R
LOW
PASS
FILTER
STEREO
ADC
STEREO
DAC
&
DIGITAL FILTERS
VOUT3L
VOUT3R
LOW
PASS
FILTER
STEREO
DAC
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WM8772EDS
CONTROL INTERFACE
WOLFSON MICROELECTRONICS plc
Production Data, October 2004, Rev 4.1
w :: www.wolfsonmicro.com
Copyright 2004 Wolfson Microelectronics plc