WM8756
192kHz, Six Channel SACD™ Compatible Audio DAC
DESCRIPTION
FEATURES
•
•
•
6-Channel DAC with PCM or Bitstream (DSD) operation.
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-
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
Audio, or
6 channels at up to 192kHz for surround
Master or slave operation with Normal or Phase
modulation method of DSD data transfer
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.
•
•
3-Wire Serial Control Interface
Programmable PCM Audio Data Interface Modes
−
−
I2S, 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)
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.
•
•
3.0V – 5.5V Supply (3.3V digital / 5V analogue option)
48-pin TQFP Package
APPLICATIONS
•
•
•
Super Audio CD (SACD™) Players
Universal and Multi-Format disc players
Home theatre systems
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.
BLOCK DIAGRAM
DMCKSEL
CSB
SCKI
ML/I2S MC/IWL MD/DM
DSDB
MODE
MUTE
DMSLV
CONTROL
INTERFACE
PCM/DSD
MUX
SIGMA
DELTA
MODULATOR
LOW
PASS
FILTER
BCKIN
LRCIN
LRCIN2
DIN0
RIGHT
DAC
OUT0R
GR0
PCM
DATA
DIGITAL
FILTERS
SIGMA
DELTA
MODULATOR
LOW
PASS
FILTER
LEFT
DAC
DIN1
MUX
OUT0L
DIN2
PCM/DSD
SIGMA
DELTA
LOW
PASS
FILTER
RIGHT
DAC
MUX
MUX
OUT1R
GR1
MODULATOR
AUDIO
INTERFACE
DIGITAL
FILTERS
SIGMA
DELTA
MODULATOR
LOW
PASS
FILTER
LEFT
DAC
OUT1L
DSDCLK128
DSDCLK64
PCM/DSD
MUX
DSD0
DSD1
DSD2
DSD3
DSD4
DSD5
SIGMA
DELTA
LOW
PASS
FILTER
RIGHT
DAC
OUT2R
GR2
DSD
DATA
MODULATOR
DIGITAL
FILTERS
SIGMA
DELTA
MODULATOR
LOW
PASS
FILTER
LEFT
DAC
MUX
OUT2L
DVDD DGND
AGND1 AGND2 AGND3 AVDD1 AVDD2
Advance Information October 2001, Rev 1.3
Copyright 2001 Wolfson Microelectronics Ltd.
WOLFSON MICROELECTRONICS LTD
www.wolfsonmicro.com
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