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Advanced Ultra High Performance Multi-bit Sigma-Delta Architecture 7 i( }9 a, }" P; z: k
- 128dB SNR (‘A’-weighted mono @ 48kHz)
0 H+ A* O# s/ R- 125dB SNR (‘A’-weighted stereo @ 48kHz) 9 I0 |, ~8 h' o5 N' M3 [
- 123dB SNR (non-weighted stereo @ 48kHz)
' o4 P2 Y8 A4 [* Y# q+ i- -100dB THD @ 48kHz R+ ?7 q/ V/ B, S
- Differential analogue voltage outputs % ^# k/ t+ J1 A% @
- High tolerance to clock jitter5 k! y8 j+ w, i# J
PCM Mode
9 { t# k2 p) C; U- Sampling frequency: 32kHz to 192kHz 3 w V/ N2 r% ]7 t
- Input data word length support: 16 to 32-bit 2 f9 E3 M& J3 {, o5 K
- Supports all standard audio interface formats
% d, L+ E* @$ j9 c) V8 B) a+ g. F- Selectable advanced digital filter responses ' ~$ J; K, D; g% C
- Includes linear/minimum phase and range of tailored characteristics
% p: j, H1 M' k5 t6 ~4 `- Enables low pre-ringing, minimal latency
* r( L" z5 S# `% M' o% X- Optional interface to industry standard external filters 8 Z( X) Z( E1 Z+ F# I
- Digital volume control in 0.125dB steps with soft ramp and soft mute / D/ C* n! m( x$ m. |# s3 Y
- Anti-clipping mode to prevent distortion even with input signals recorded up to 0dB 5 ~6 {( }* ?# i9 N. X
- Selectable de-emphasis support 0 }$ W3 a" q- @. s* i
- Zero Flag output% P. ?; ~! t h+ k8 U
DSD Mode
8 y7 ]* k! t5 ^8 E5 h" q- DSD bit-stream support for SACD applications 7 N0 k6 j; d) K: s. g" q
- Support for normal or phase modulated bit-streams 2 p; M1 D8 [! ^5 k& O1 `4 W0 T
- Direct or PCM converted DSD paths (DSD Plus) ! D+ B- X0 y6 p
- DSD mute% t" f$ y# e+ M% b
Hardware or software control modes: : V/ [: u7 k7 o' T1 q+ r
- 2 and 3 wire serial control interface support4 I( O" u7 {& i: L2 `% `
Pin compatible with WM8740
1 G7 t) W# [( c& `/ \, J4.5V to 5.5V analogue, 3.0V to 3.6V digital supply operation; B9 C8 |* ?1 T: M% `+ T% ?
28-lead SSOP Package
$ M( }( u! v- f* O 描述0 d7 H- c9 \" S% B
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. $ l# ]6 c8 C1 j
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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.
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5 k! d7 p; [/ V; L! F/ x( mThe 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. G$ p% l4 c, @" |
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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. ' X1 J1 O# \! {: B
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The WM8741 is available in a convenient 28-SSOP package, and is pin compatible with the WM8740.+ F- v* r- i( @ T
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[ 本帖最后由 sd-iori 于 2008-1-1 17:04 编辑 ] |
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发表于 2008-1-1 16:48
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