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# O1 A( @' v; |6 F. ~Advanced Ultra High Performance Multi-bit Sigma-Delta Architecture
1 b+ ^/ ~( A$ B1 `# x- 128dB SNR (‘A’-weighted mono @ 48kHz) 8 o) v3 A" }7 W
- 125dB SNR (‘A’-weighted stereo @ 48kHz)
0 b* t( O4 \* O1 F- 123dB SNR (non-weighted stereo @ 48kHz) 7 f: F$ E1 }: j6 P! ?' B7 t& L$ L
- -100dB THD @ 48kHz 1 n4 P* {$ k: U F7 l
- Differential analogue voltage outputs 4 R& l8 W! H4 M8 c
- High tolerance to clock jitter
2 M" u$ D/ R' b% x: r2 {/ ?; V) rPCM Mode
& ~% K/ O& d. ?- Sampling frequency: 32kHz to 192kHz
2 W6 ~( q' v, n. k i! r P- Input data word length support: 16 to 32-bit
2 C2 s5 R, c! E( @- Supports all standard audio interface formats 8 ~% P5 {; ^/ z6 K, ~) I+ `: b! k
- Selectable advanced digital filter responses
6 S# a3 ?* E1 u" ?+ T0 o8 A- Includes linear/minimum phase and range of tailored characteristics ' b) | ~2 `# D- ^3 s' s
- Enables low pre-ringing, minimal latency 5 ^: X9 T( W, u, Y" F# [) ^
- Optional interface to industry standard external filters 7 s8 ]* t1 Z+ I2 \
- Digital volume control in 0.125dB steps with soft ramp and soft mute " ~! r4 { m6 J9 Y+ r: q
- Anti-clipping mode to prevent distortion even with input signals recorded up to 0dB % u6 w5 f7 p" y: W5 Q
- Selectable de-emphasis support
; G1 ~0 S8 ]( H) y; _% I3 G- Zero Flag output8 G7 J0 ^$ g, o' v) n# i3 j
DSD Mode ! V9 f) m) ~' C4 q( L9 y
- DSD bit-stream support for SACD applications
" j) U: k' s7 j7 {- Support for normal or phase modulated bit-streams * ~, [: d7 a$ _9 Q- J
- Direct or PCM converted DSD paths (DSD Plus) " v6 Y$ e. Q' G
- DSD mute
$ a( ]3 | a0 ]- G5 UHardware or software control modes:
/ Y! v( f" o( M7 }- 2 and 3 wire serial control interface support/ `' i3 o" Q/ W
Pin compatible with WM8740
# U" i, C2 E2 @% V* q! X* l4.5V to 5.5V analogue, 3.0V to 3.6V digital supply operation
5 |, D+ I& d8 q! x1 G28-lead SSOP Package# C, L- c: I1 L1 q
描述
; Z' A+ h, {. 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.
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2 g+ j$ ^3 t9 y9 Q+ B7 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. ) w2 D9 H" Q1 H4 x
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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. 5 d& l- x" J2 H1 h6 }4 U# t
, S! D2 [3 v5 l6 D/ z+ d- DThe 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. + f9 O8 v4 M& o1 j$ Q
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The WM8741 is available in a convenient 28-SSOP package, and is pin compatible with the WM8740.
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" m$ V* l2 L0 w k+ y[ 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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