WM8756
192kHz, Six Channel SACD™ Compatible Audio DAC
DESCRIPTION
The WM8756 is a high performance 6-channel DAC
designed for audio applications such as SACD™ players,
DVD-V and DVD-A, home audio and theatre systems. The
device supports data input word lengths from 16 to 32-bits
and sampling rates up to 192kHz. The WM8756 can
implement 2 or 6 channels at 192kHz for high-end DVD-
Audio, or 6 channels at up to 192kHz for surround
applications. Additionally 64x DSD bitstream support is
offered on all 6 channels. The WM8756 consists of a serial
interface port, digital interpolation filters, multi-bit sigma
delta modulators and 6 DACs in a 48-pin TQFP package.
The WM8756 also includes a digitally controllable mute and
attenuator function on each channel, accessible during
PCM operation. An on-chip multiplexer selects between
PCM or DSD audio data input pins.
The WM8756 supports hardware or software connection
schemes for audio DAC control. The serial control interface
provides access to a wide range of features including on-
chip mute, attenuation and phase reversal. Hardware pin-
controllable operation is also available.
The WM8756 is an ideal device for all surround sound
applications supporting the SACD™ audio format, such as
SACD
players,
multi-format
players
and
home
entertainment systems.
FEATURES
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6-Channel DAC with PCM or Bitstream (DSD) operation.
DSD 64x Bitstream Support for Super Audio CD™
Independent input pins for PCM and DSD data with on-
chip multiplexer
THD –96dB, SNR 106dB (‘A’ weighted @ 48kHz)
PCM mode Sampling Rate: 8kHz – 192kHz
Master or slave operation with Normal or Phase
modulation method of DSD data transfer
3-Wire Serial Control Interface
Programmable PCM Audio Data Interface Modes
−
I
2
S, Left, Right Justified or DSP
−
16/20/24/32 bit Word Lengths
Independent Digital Volume Control on Each Channel with
127.5dB Range in 0.5dB Steps (in PCM mode)
3.0V – 5.5V Supply (3.3V digital / 5V analogue option)
48-pin TQFP Package
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APPLICATIONS
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Super Audio CD (SACD™) Players
Universal and Multi-Format disc players
Home theatre systems
BLOCK DIAGRAM
CSB
SCKI
ML/I2S
MC/IWL
MD/DM
DSDB
MODE
MUTE
DMSLV DMCKSEL
CONTROL
INTERFACE
PCM/DSD
BCKIN
LRCIN
LRCIN2
DIN0
DIN1
DIN2
PCM
DATA
DIGITAL
FILTERS
SIGMA
DELTA
MODULATOR
MUX
RIGHT
DAC
LOW
PASS
FILTER
LOW
PASS
FILTER
OUT0R
GR0
SIGMA
DELTA
MODULATOR
MUX
PCM/DSD
SIGMA
DELTA
MODULATOR
AUDIO
INTERFACE
DSDCLK128
DSDCLK64
PCM/DSD
DSD0
DSD1
DSD2
DSD3
DSD4
DSD5
DSD
DATA
DIGITAL
FILTERS
SIGMA
DELTA
MODULATOR
MUX
RIGHT
DAC
LOW
PASS
FILTER
LOW
PASS
FILTER
OUT2R
GR2
SIGMA
DELTA
MODULATOR
MUX
LEFT
DAC
OUT2L
DIGITAL
FILTERS
RIGHT
DAC
LOW
PASS
FILTER
LOW
PASS
FILTER
LEFT
DAC
OUT0L
MUX
OUT1R
GR1
SIGMA
DELTA
MODULATOR
MUX
LEFT
DAC
OUT1L
DVDD
DGND
AGND1 AGND2 AGND3 AVDD1 AVDD2
WOLFSON MICROELECTRONICS LTD
www.wolfsonmicro.com
Advance Information October 2001, Rev 1.3
Copyright
2001
Wolfson Microelectronics Ltd
.
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
