WM8771 Datasheet, PDF (1/44 Pages) Wolfson Microelectronics plc – 24-bit, 192kHz 8-Channel Codec

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WM8771
24-bit, 192kHz 8-Channel Codec
DESCRIPTION
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.
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.
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.
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.
BLOCK DIAGRAM
FEATURES
• Audio Performance
− 108dB SNR (‘A’ weighted @ 48kHz) DAC
− 97dB SNR (‘A’ weighted @ 48kHz) ADC
• DAC Sampling Frequency: 8kHz – 192kHz
• ADC Sampling Frequecncy: 8kHz – 96kHz
• 3-Wire SPI or CCB MPU Serial Control Interface
• Master or Slave Clocking Mode
• Programmable Audio Data Interface Modes
− I²S, Left, Right Justified or DSP
− 16/20/24/32 bit Word Lengths
• Four Independent Stereo DAC Audio Outputs
• Eight stereo ADC inputs with analogue gain adjust from
+19dB to –12dB in 1dB steps
• 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply
Operation
• 5V tolerant digital inputs
• 64-Pin TQFP Package
APPLICATIONS
• Surround Sound Processors
• Automotive Audio
AIN1L
AIN1R
AIN2L
AIN2R
AIN3L
AIN3R
AIN4L
AIN4R
AIN5L
AIN5R
AIN6L
AIN6R
AIN7L
AIN7R
AIN8L
AIN8R
AINOPL
AINOPR
REC1L
REC1R
REC2L
REC2R
REC3L
REC3R
MUTE
MUTE
MUTE
STEREO
ADC
AUDIO INTERFACE
&
DIGITAL FILTERS
CONTROL INTERFACE
DIGITAL
FILTERS
DIGITAL
FILTERS
DIGITAL
FILTERS
DIGITAL
FILTERS
STEREO
DAC
STEREO
DAC
STEREO
DAC
STEREO
DAC
LOW
PASS
FILTERS
LOW
PASS
FILTERS
LOW
PASS
FILTERS
LOW
PASS
FILTERS
VOUT1L
VOUT1R
VOUT2L
VOUT2R
VOUT3L
VOUT3R
VOUT4L
VOUT4R
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WM8771
CCB is a trademark of SANYO ELECTRIC CO., LTD
WOLFSON MICROELECTRONICS LTD
w :: www.wolfsonmicro.com
CCB is SANYO’s original bus format and all the bus addresses are controlled by SANYO.
Product Preview, December 2001, Rev 2.0
Copyright 2001 Wolfson Microelectronics Ltd.