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Advanced Ultra High Performance Multi-bit Sigma-Delta Architecture ; @8 e* f7 x+ g/ }
- 128dB SNR (‘A’-weighted mono @ 48kHz) ( ^8 O' L5 n( ^* x' [8 c
- 125dB SNR (‘A’-weighted stereo @ 48kHz)
% j; Y% t' P& V" e- 123dB SNR (non-weighted stereo @ 48kHz)
0 h& K e7 [- {0 t- -100dB THD @ 48kHz & l! b, ~* o! u0 t) i
- Differential analogue voltage outputs ( O# o+ b& ^, H/ v! B
- High tolerance to clock jitter2 U$ y5 t9 P) s' m; L3 G T
PCM Mode ' T, V. O' ^+ K5 [4 k+ S0 E1 h
- Sampling frequency: 32kHz to 192kHz 7 i' P* z8 U. e! D$ H! `
- Input data word length support: 16 to 32-bit
4 t. a% G( i7 [, j* } u- Supports all standard audio interface formats
, _; _/ z. o8 W* W1 M- Selectable advanced digital filter responses
( p; Q( a: |% ~ ~- Includes linear/minimum phase and range of tailored characteristics 1 E7 W: O9 I; b% i: e
- Enables low pre-ringing, minimal latency
, [( f$ M% Y' T& m5 }- Optional interface to industry standard external filters 0 X" ^. ~) \/ L. `% I& q
- Digital volume control in 0.125dB steps with soft ramp and soft mute ' }" y" h7 I+ s. B1 H& J3 S* o
- Anti-clipping mode to prevent distortion even with input signals recorded up to 0dB
/ z7 H! m; |! Y/ S7 U- Selectable de-emphasis support
0 J9 T5 c" x' |$ X3 W( x K- Zero Flag output! C- K* o3 y5 P) @6 ]
DSD Mode 8 L; W% O1 m I6 u4 f# q
- DSD bit-stream support for SACD applications 7 \! X9 P! f& ?% P0 |6 d* A
- Support for normal or phase modulated bit-streams
- D7 W* }- q+ B$ B3 r% `- Direct or PCM converted DSD paths (DSD Plus) & H# x- o V+ \* i' h+ A
- DSD mute
: V# k; R D3 [6 N, J& c! }Hardware or software control modes:
& F8 R- u7 u3 O+ u/ ]; j. p- 2 and 3 wire serial control interface support6 U( ^( i0 v1 Q! w. }
Pin compatible with WM8740
- ?# v0 c# _" E" b4.5V to 5.5V analogue, 3.0V to 3.6V digital supply operation
3 r2 x$ z( y3 ~- ], Y28-lead SSOP Package
+ z5 _2 @: D6 ~+ m. Q. h* K+ n 描述/ m' a; V; X% F3 Q; t( W
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. 5 T" d8 q" T1 Y2 u
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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. ' P/ R5 I. a! K% M+ p
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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. + A" x" b2 U" B6 D5 V7 W
8 K4 p- Q6 C9 P( Q0 p! HThe 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. 3 L. `5 f: @* K' J* X Y0 `
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The WM8741 is available in a convenient 28-SSOP package, and is pin compatible with the WM8740.7 J6 V0 ~/ `. y: G
! d. u0 T e5 U: S- r' T: F[ 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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