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8 D2 u( j/ P$ ^, a R/ }8 H4 oAdvanced Ultra High Performance Multi-bit Sigma-Delta Architecture % u' `. D) Y' g
- 128dB SNR (‘A’-weighted mono @ 48kHz) : C' M- h, ~& J% o
- 125dB SNR (‘A’-weighted stereo @ 48kHz) - d) c5 i E* d- I/ ], B$ S
- 123dB SNR (non-weighted stereo @ 48kHz)
- P% |5 Y/ c3 ?) Z9 m- -100dB THD @ 48kHz
) R' @/ h% T% Q* z% R- Differential analogue voltage outputs
: \. a3 `% T+ k' s- High tolerance to clock jitter
3 w' E1 P: V" X lPCM Mode
- g4 F) y* E" J+ s2 e; @$ c. B- Sampling frequency: 32kHz to 192kHz 4 L9 Q( \- D5 h) j5 r
- Input data word length support: 16 to 32-bit " j6 T& ]! o: e' ?8 ^5 S0 f
- Supports all standard audio interface formats % \, J+ n, z( l
- Selectable advanced digital filter responses * Z4 L4 k; @+ q$ Q1 q5 Q5 _2 P N
- Includes linear/minimum phase and range of tailored characteristics
2 {+ c; a/ R7 C- m1 D! U9 ~- Enables low pre-ringing, minimal latency
! L6 A1 {; F& e% F8 N9 S1 r- Optional interface to industry standard external filters
5 o; |6 j; {' @2 l$ j. D- Digital volume control in 0.125dB steps with soft ramp and soft mute
( f: I; t O( p' V% A( q# c' I* i- Anti-clipping mode to prevent distortion even with input signals recorded up to 0dB - _' W. n5 N; b) t$ {! D6 _0 L/ Q
- Selectable de-emphasis support ' u" s: ]: v4 _7 `8 }
- Zero Flag output# y9 z* n {* K; I% [3 K7 N$ X
DSD Mode 7 }1 G5 ] E" _% m1 `1 S z
- DSD bit-stream support for SACD applications
8 _! Z1 r8 j6 W: a) T- Support for normal or phase modulated bit-streams ' a' ~% g* T5 H2 a, F7 N1 `9 I$ G1 Y% u
- Direct or PCM converted DSD paths (DSD Plus) 6 |, @, e0 R _( ?( [& X6 |
- DSD mute7 @0 ~3 I5 z$ V0 O" n t9 F0 c x" D
Hardware or software control modes: " c2 l9 ~/ K5 L/ U1 X% r* r4 A4 J
- 2 and 3 wire serial control interface support5 M- H/ l0 _9 d; |- L O/ d+ L
Pin compatible with WM8740' }; r+ I, P" C% N) ^) {$ z
4.5V to 5.5V analogue, 3.0V to 3.6V digital supply operation
0 Y- G. \2 R* ?6 X; E0 w }5 ^28-lead SSOP Package' c0 C @. d4 a Y% j
描述
/ x l7 r4 W9 F! HThe 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. - p/ ~' k. L. i3 J" }- ?
% I8 O' P6 K' x4 Y7 NThe 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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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. ; E! @* y( T1 }% @) f2 _6 h
+ y |* ]/ i: P- nThe 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.
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" h- g$ n/ J# H7 n- w4 sThe WM8741 is available in a convenient 28-SSOP package, and is pin compatible with the WM8740., Z6 E: W# m5 c* _7 S7 C+ J' U
6 M4 A6 j& @1 y( m" D8 K# p+ Y& }, \+ H[ 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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