
w
WM8768
24-bit, 192kHz 8-Channel DAC
DESCRIPTION
WOLFSON MICROELECTRONICS plc
w :: www.wolfsonmicro.com
Production Data, March 2005, Rev 4.1
Copyright
2005 Wolfson Microelectronics plc
The WM8768 is a multi-channel audio DAC ideal for DVD
and surround sound processing applications for home hi-fi,
automotive and other audio visual equipment.
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 volume and mute control.
The audio data interface supports I
2
S, left justified, right
justified and DSP digital audio formats.
The device is controlled either via a 3 wire serial interface or
directly using the hardware interface. These interfaces
provide access to features including channel selection,
volume
controls,
mutes,
management facilities. The device is available in a 28-pin
SSOP.
de-emphasis
and
power
FEATURES
8-Channel DAC with PCM.
Audio Performance
103dB SNR (‘A’ weighted @ 48kHz) DAC
DAC Sampling Frequency: 8kHz – 192kHz
3-Wire SPI Serial or Hardware Control Interface
Programmable Audio Data Interface Modes
I
2
S, Left, Right Justified or DSP
16/20/24/32 bit Word Lengths
Four 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 Package
APPLICATIONS
DVD Players
Surround Sound AV Processors and Hi-Fi systems
Automotive Audio
BLOCK DIAGRAM
VOUT1L
VOUT1R
VOUT2L
VOUT2R
VOUT3L
VOUT3R
V
V
V
DIGITAL AUDIO
INTERFACE
&
DIGITAL FILTERS
VREFP
STEREO
DAC
STEREO
DAC
D
A
D
CONTROL INTERFACE
M
M
M
WM8768
LOW
PASS
FILTER
LOW
PASS
FILTER
LOW
PASS
FILTER
M
M
STEREO
DAC
VREFN
W
BCLK
LRCLK
DIN3
DIN4
DIN2
DIN1
MCLK
T
VOUT4L
VOUT4R
STEREO
DAC
LOW
PASS
FILTER
A