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DESCRIPTION
The WM8741 is a very high performance stereo DAC
designed for audio applications such as professional
recording systems, A/V receivers and high specification CD,
DVD and home theatre systems. The device supports PCM
data input word lengths from 16 to 32-bits and sampling
rates up to 192kHz. The WM8741 also supports DSD bit-
stream data format, in both direct DSD and PCM-converted
DSD modes.
The WM8741 includes fine resolution volume and soft mute
control, digital de-emphasis and a range of advanced digital
filter responses, followed by a digital interpolation filter,
multi-bit sigma delta modulator and stereo DAC. Wolfson’s
patented architecture optimises the linearity of the DAC and
provides maximum insensitivity to clock jitter.
The digital filters include several selectable roll-off and
performance characteristics. The user can select between
standard sharp or slow roll-off responses. In addition, the
WM8741 includes a selection of advanced digital filter
characteristics including non-half band filters and minimum
phase filters.
This flexibility provides a range of benefits, such as
significantly reduced pre-ringing and minimal group delay.
The internal digital filters can also be by-passed and the
WM8741 used with an external digital filter.
The WM8741 supports two connection schemes for audio
DAC control. The 2/3 wire serial control interface provides
access to all features. A range of features can also be
accessed by hardware control interface.
The WM8741 is available in a convenient 28-SSOP
package, and is pin compatible with the WM8740.
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WM8741
24-bit 192kHz DAC with Advanced Digital Filtering
FEATURES
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Advanced Ultra High Performance Multi-bit Sigma-Delta
Architecture
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128dB SNR (‘A’-weighted mono @ 48kHz)
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125dB SNR (‘A’-weighted stereo @ 48kHz)
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123dB SNR (non-weighted stereo @ 48kHz)
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-100dB THD @ 48kHz
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Differential analogue voltage outputs
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High tolerance to clock jitter
PCM Mode
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Sampling frequency: 32kHz to 192kHz
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Input data word length support: 16 to 32-bit
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Supports all standard audio interface formats
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Selectable advanced digital filter responses
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Includes linear/minimum phase and range of
tailored characteristics
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Enables low pre-ringing, minimal latency
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Optional interface to industry standard external filters
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Digital volume control in 0.125dB steps with soft ramp
and soft mute
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Anti-clipping mode to prevent distortion even with input
signals recorded up to 0dB
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Selectable de-emphasis support
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Zero Flag output
DSD Mode
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DSD bit-stream support for SACD applications
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Support for normal or phase modulated bit-streams
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Direct or PCM converted DSD paths (DSD Plus)
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DSD mute
Hardware or software control modes:
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2 and 3 wire serial control interface support
Pin compatible with WM8740
4.5V to 5.5V analogue, 3.0V to 3.6V digital supply operation
28-lead SSOP Package
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APPLICATIONS
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Professional audio systems
CD, DVD, SACD audio
Home theatre systems
A/V receivers
WOLFSON MICROELECTRONICS plc
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Production Data, October 2009, Rev 4.2
Copyright
©2009
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
