WM8772 Datasheet, PDF (1/70 Pages) Wolfson Microelectronics plc – 24 BIT 192KHZ 6 CHANNEL CODEC WITH VOLUME CONTROL

w
WM8772
24-bit, 192kHz 6-Channel Codec with Volume Control
DESCRIPTION
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.
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.
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.
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 28-pin
SSOP or 32 pin TQFP.
BLOCK DIAGRAM - 28 PIN SSOP
FEATURES
• Audio Performance
− 103dB SNR (‘A’ weighted @ 48kHz) DAC
− 100dB SNR (‘A’ weighted @ 48kHz) ADC (TQFP)
• DAC Sampling Frequency: 8kHz – 192kHz
• ADC Sampling Frequency: 32kHz – 96kHz
• 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
− I²S, Left, Right Justified or DSP
− 16/20/24/32 bit Word Lengths
• Three Independent stereo DAC outputs with independent
digital volume controls
• Master or Slave Audio Data Interface
• 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply
Operation
• 28 pin SSOP or 32 pin TQFP Package
APPLICATIONS
• DVD Players
• Surround Sound AV Processors and Hi-Fi systems
• Automotive Audio
AINL
AINR
VREFN
STEREO
ADC
AUDIO
INTERFACE
&
DIGITAL FILTERS
VREFN VREFP
STEREO
DAC
STEREO
DAC
STEREO
DAC
LOW
PASS
FILTER
LOW
PASS
FILTER
LOW
PASS
FILTER
VOUT1L
VOUT1R
VOUT2L
VOUT2R
VOUT3L
VOUT3R
CONTROL INTERFACE
W
WM8772EDS
WOLFSON MICROELECTRONICS plc
w :: www.wolfsonmicro.com
Production Data, October 2004, Rev 4.1
Copyright 2004 Wolfson Microelectronics plc