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这个要先从DAC下手,,
5 M; C1 j5 h3 ~: {. SAKM 的DAC都自带音量调节功能,,# ~% c% { R- e9 D
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1 l3 y: p+ _% p7 c8 h3 G, I) }! N. d
AP192也是这样的" R6 V; x4 n2 b4 Y' \4 t
AP192调节音量,,不是利用控制IO芯片的,,
8 y+ Y0 U, k; j8 `8 t而且利用控制DAC来实现的
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http://www.asahi-kasei.co.jp/akm/en/product/ak4358/ak4358.html
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Sampling Rate Ranging from 8kHz to 192kHz
3 |2 L! m0 L. D24Bit 8 times Digital Filter with Slow roll-off option
5 N% g, G& _( e, z8 fTHD+N: -94dB
! z: w1 e l% E* UDR, S/N: 112dB
( t9 b% |; Z# nHigh Tolerance to Clock Jitter & j! w+ p* A9 f: k i" E
Low Distortion Differential Output
' w# L9 Q% M8 ]DSD Data input available b" V& {# v3 M, a
Digital De-emphasis for 32, 44.1 & 48kHz sampling # ] V( U5 }8 F2 F# T# x
Zero Detect function
$ {/ D! R+ m' Z7 |2 _+ hChannel Independent Digital Attenuator with soft-transition (3 Speed mode)
4 Z C% K+ t' q, s4 }. t% |Soft Mute * U6 I& Y7 c# A
3-wire Serial and I2C Bus µP I/F for mode setting ) K* i1 k! I x. s2 M, x) N
I/F format: MSB justified, LSB justified (16bit, 20bit, 24bit), I2S, TDM or DSD
( @& m+ Z4 r/ \Master clock: 256fs, 384fs, 512fs or 768fs (PCM Normal Speed Mode)
`" }7 ~, l. O128fs, 192fs, 256fs or 384fs (PCM Double Speed Mode)
) T7 p" n! L/ q4 u( v128fs or 192fs (PCM Quad Speed Mode)
) T& ]7 P9 q0 ?2 }( d! s" ^/ H; `512fs or 768fs (DSD Mode) . H7 R% U* t5 [0 @3 F
Power Supply: 4.75 to 5.25V % i) Q. n) P: j! v9 x5 O" m4 f4 R* ?. K
48pin LQFP Package
' F9 q2 q. X3 M, ` fEvaluation Board: AKD4358 |
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