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/ q8 {6 t1 G1 \4 n0 ]Advanced Ultra High Performance Multi-bit Sigma-Delta Architecture + p, B7 ~( _+ ~; I7 ]* W3 H" H4 y
- 128dB SNR (‘A’-weighted mono @ 48kHz)
+ n* C0 O6 X* z7 F5 i- 125dB SNR (‘A’-weighted stereo @ 48kHz) - B7 P# b; ^* X" I8 u+ v: R
- 123dB SNR (non-weighted stereo @ 48kHz)
% m; P; s" x4 `8 T% x; X9 s- -100dB THD @ 48kHz
3 [3 Z! N% p0 z7 [7 C; y Z: v H- Differential analogue voltage outputs [9 S% e$ W% l3 e
- High tolerance to clock jitter* K- i! k% C5 n8 r$ j
PCM Mode
- [+ [& {' `' N) P- Sampling frequency: 32kHz to 192kHz : ]. |3 G K1 l; m% r2 C3 `
- Input data word length support: 16 to 32-bit
8 F) i, L N. j1 n* G: _- o; B8 b0 G- Supports all standard audio interface formats % I; J: b7 e3 E6 Z/ e6 d5 {- X
- Selectable advanced digital filter responses
2 x$ N- [6 g( s9 W5 Q0 e3 l1 C% ^- Includes linear/minimum phase and range of tailored characteristics 2 c0 M% }) H" Y6 ?/ L: v7 z
- Enables low pre-ringing, minimal latency
0 J0 B$ ^7 ^: [& c6 W2 Y- Optional interface to industry standard external filters * ?9 g3 c$ z+ j5 t4 t
- Digital volume control in 0.125dB steps with soft ramp and soft mute & Z0 X# g( X9 ]9 B! Q. z: Y
- Anti-clipping mode to prevent distortion even with input signals recorded up to 0dB 1 }8 y0 `7 |5 @* |
- Selectable de-emphasis support 8 ]4 R4 _. Q- I4 S% v* s
- Zero Flag output$ e) `6 ?5 E3 E4 a2 p9 s
DSD Mode
. g6 a8 }& S( J# p( r4 G3 j( Q- DSD bit-stream support for SACD applications
/ H3 [3 d, C1 T- Support for normal or phase modulated bit-streams
4 e2 G3 H1 `+ i- Direct or PCM converted DSD paths (DSD Plus) 2 ~, a Y) m! a% M
- DSD mute* p& D4 A" X- q1 A I3 D9 `6 f6 `
Hardware or software control modes: $ t9 Y$ p9 v: V9 r" X* w
- 2 and 3 wire serial control interface support
# Z1 f6 ?" h2 N! h. dPin compatible with WM8740
9 A6 Y: [ \% E4.5V to 5.5V analogue, 3.0V to 3.6V digital supply operation# \& D H/ L# y; w. n: S$ G
28-lead SSOP Package+ p5 d( V$ a7 b& r3 i7 l
描述
) C! l, p1 h) v4 a- R( |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.
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2 q& T0 Z: v' s/ i: }* b0 ?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. # H% d( R! q( ^3 Y8 G
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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. ' R/ e2 W( h" N; f" n; R$ y$ b$ h+ P
* [# |+ Z- V$ Q, N+ {$ t. ^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. 1 F4 ~ x2 [" S1 t: `9 p
7 G. J7 B* D! s8 E8 sThe WM8741 is available in a convenient 28-SSOP package, and is pin compatible with the WM8740.
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/ \' O$ w; c8 g[ 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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