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这个要先从DAC下手,,; I3 Y$ m" m1 m4 U
AKM 的DAC都自带音量调节功能,,
; x& ?9 }9 [& }* d6 Y很多专业卡,,用AKM的DAC,,其中一个原因,,就是看上这个音量调节4 U s; C! g& C! |/ u1 v
AP192也是这样的, h+ q9 ?) j2 f# X, M8 c* D' G( t! Q
AP192调节音量,,不是利用控制IO芯片的,,
, q0 s( G# [, K, H. B而且利用控制DAC来实现的) N0 c0 t. a9 t) ?! ?" j
% I8 w; D# l& O9 d1 c. P* j2 W. Nhttp://www.asahi-kasei.co.jp/akm/en/product/ak4358/ak4358.html8 s) b' @9 {2 f1 q
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Sampling Rate Ranging from 8kHz to 192kHz
0 S1 ~( H8 n. j( @, `/ ?5 U8 a$ |24Bit 8 times Digital Filter with Slow roll-off option 2 d) F) Y- `. _& I
THD+N: -94dB
* K* S+ p B! U1 i1 S0 wDR, S/N: 112dB
5 g; ^5 w6 ~: s+ m7 a0 Y8 R/ r7 Z ZHigh Tolerance to Clock Jitter 8 d. b1 c" w; h. G% @, c
Low Distortion Differential Output
" x' m% W3 l/ o6 Y. L8 b& bDSD Data input available
4 @6 [6 a, [% [$ d* A: wDigital De-emphasis for 32, 44.1 & 48kHz sampling 6 {0 Y& ]* w4 x/ l) c) t6 Z
Zero Detect function
7 F! L N5 E" b R4 ^" B+ nChannel Independent Digital Attenuator with soft-transition (3 Speed mode)
, W# Y4 I/ u( a$ Y0 l Q! jSoft Mute
3 r- W& M6 [$ I+ d" b7 F3-wire Serial and I2C Bus µP I/F for mode setting
4 \0 _) o3 P' q8 HI/F format: MSB justified, LSB justified (16bit, 20bit, 24bit), I2S, TDM or DSD
2 K9 t3 o; ]7 I2 j9 G* CMaster clock: 256fs, 384fs, 512fs or 768fs (PCM Normal Speed Mode)
: H2 {# i% q0 G' X128fs, 192fs, 256fs or 384fs (PCM Double Speed Mode)" X6 }/ f( N3 H8 U8 @ F2 {/ r
128fs or 192fs (PCM Quad Speed Mode)
$ h& }. j( u" Z7 Q: e0 e6 L0 q' [2 E512fs or 768fs (DSD Mode) , R) }; N: H0 `4 h+ t0 e
Power Supply: 4.75 to 5.25V : I8 J9 ]! b4 `
48pin LQFP Package
: j+ ]# A6 p c! U. sEvaluation Board: AKD4358 |
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