WM8741
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24-bit 192kHz DAC with Advanced Digital Filtering
DESCRIPTION FEATURES
Advanced Ultra High Performance Multi-bit Sigma-Delta
The WM8741 is a very high performance stereo DAC
Architecture
designed for audio applications such as professional
128dB SNR (A-weighted mono @ 48kHz)
recording systems, A/V receivers and high specification CD,
125dB SNR (A-weighted stereo @ 48kHz)
DVD and home theatre systems. The device supports PCM
123dB SNR (non-weighted stereo @ 48kHz)
data input word lengths from 16 to 32-bits and sampling
-100dB THD @ 48kHz
rates up to 192kHz. The WM8741 also supports DSD bit-
Differential analogue voltage outputs
stream data format, in both direct DSD and PCM-converted
High tolerance to clock jitter
DSD modes.
PCM Mode
The WM8741 includes fine resolution volume and soft mute
Sampling frequency: 32kHz to 192kHz
control, digital de-emphasis and a range of advanced digital
Input data word length support: 16 to 32-bit
filter responses, followed by a digital interpolation filter,
Supports all standard audio interface formats
multi-bit sigma delta modulator and stereo DAC. Wolfsons
Selectable advanced digital filter responses
patented architecture optimises the linearity of the DAC and
Includes linear/minimum phase and range of
provides maximum insensitivity to clock jitter.
tailored characteristics
Enables low pre-ringing, minimal latency
The digital filters include several selectable roll-off and
Optional interface to industry standard external filters
performance characteristics. The user can select between
Digital volume control in 0.125dB steps with soft ramp
standard sharp or slow roll-off responses. In addition, the
and soft mute
WM8741 includes a selection of advanced digital filter
Anti-clipping mode to prevent distortion even with input
characteristics including non-half band filters and minimum
signals recorded up to 0dB
phase filters.
Selectable de-emphasis support
This flexibility provides a range of benefits, such as Zero Flag output
significantly reduced pre-ringing and minimal group delay. DSD Mode
The internal digital filters can also be by-passed and the DSD bit-stream support for SACD applications
WM8741 used with an external digital filter. Support for normal or phase modulated bit-streams
Direct or PCM converted DSD paths (DSD Plus)
The WM8741 supports two connection schemes for audio
DSD mute
DAC control. The 2/3 wire serial control interface provides
Hardware or software control modes:
access to all features. A range of features can also be
2 and 3 wire serial control interface support
accessed by hardware control interface.
Pin compatible with WM8740
4.5V to 5.5V analogue, 3.15V to 3.6V digital supply
The WM8741 is available in a convenient 28-SSOP
operation
package, and is pin compatible with the WM8740.
28-lead SSOP Package
APPLICATIONS
Professional audio systems
CD, DVD, SACD audio
Home theatre systems
A/V receivers
WOLFSON MICROELECTRONICS plc Production Data, February 2013, Rev 4.3
Copyright 2013 Wolfson Microelectronics plc
WM8741 Production Data
BLOCK DIAGRAM
CONTROL INTERFACE
PCM
SIGMA DELTA
ATTENUATION / VMIDL
MODULATOR
MUTE
PCM
PCM DIGITAL FILTERS
BCLK/DSD64CLK
PCM
SIGMA DELTA
FSEL/DINR ATTENUATION / VOUTLP
MODULATOR
MUTE DAC
AUDIO
DIN/DINL
LEFT
INTERFACE
LRCLK/DSDL VOUTLN
IWO/DOUT
OSR/DSDR
DSD
DSD TO PCM
ATTENUATION / VOUTRP
CONVERTOR
MUTE DAC
RIGHT
DSD
VOUTRN
VMIDR
WM8741
PD, Rev 4.3, February 2013
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2
MUTEB/SDOUT
MODE/LRSEL
CSB/SADDR/I2S
SDIN/DEEMPH
SCLK/DSD
ZFLAG
MCLK DIFFHW
PCM/DSD MUX
AVDDR AVDDL
AGNDR AGNDL
AVDD
AGND