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AK4495SEQ Datasheet, PDF (32/58 Pages) Asahi Kasei Microsystems – Quality-oriented Premium 32-Bit 2ch DAC | |||
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[AK4495S]
â D/Aå¤æã¢ã¼ãåãæ¿ãã¿ã¤ãã³ã°
RSTN bit
D/A Mode
D/A Data
ï³4/fs
PCM Mode
DSD Mode
ï³0
PCM Data
DSD Data
Figure 10. D/A Mode Switching Timing (PCM to DSD)
RSTN bit
D/A Mode
D/A Data
DSD Mode
PCM Mode
ï³4/fs
DSD Data
PCM Data
Figure 11. D/A Mode Switching Timing (DSD to PCM)
Note. DSD modeæã¯25%ãã75%ãã¥ã¼ãã£ãä¿¡å·ã¬ã³ã¸ã¨ãã¾ããSACDãã©ã¼ãããããã¯(Scarlet
Book)ã§ã¯ãDSDä¿¡å·ã®ãã¼ã¯ã¬ãã«ããã®ãã¥ã¼ãã£ãè¶ãããã¨ã¯æ¨å¥¨ããã¦ãã¾ããã
â ãã£ã¨ã³ãã¡ã·ã¹ãã£ã«ã¿
IIRãã£ã«ã¿ã«ãã3å¨æ³¢æ°(32kHz, 44.1kHz, 48kHz)対å¿ã®ãã£ã¨ã³ãã¡ã·ã¹ãã£ã«ã¿(50/15ïsç¹æ§)ãå
èµãã¦ãã¾ãã256fs/384fs ã¨128fs/192fs ã®æã«ã¯ãã£ã¨ã³ãã¡ã·ã¹ãã£ã«ã¿ã¯OFFã§ããDSD modeæã«
ã¯DEM1-0 bitã¯ç¡å¹ã§ããPCM modeã¨DSD modeãåãæ¿ãã¦ãè¨å®å¤ã¯ä¿æããã¾ãã
DEM1 DEM0
Mode
0
0
44.1kHz
0
1
OFF (default)
1
0
48kHz
1
1
32kHz
Table 21. De-emphasis Control
â åºåããªã¥ã¼ã (PCM, DSD)
AK4495Sã¯ããã£ã³ãã«ç¬ç«ã®ãã£ã¸ã¿ã«åºåããªã¥ã¼ã (ATT)ãå
èµãã¦ãããMUTEãå«ã0.5dBã¹ãããã
256ã¬ãã«å¯å¤ã§ãã¾ãããã®ããªã¥ã¼ã ã¯DACã®å段ã«é
ç½®ãããå
¥åãã¼ã¿ã0dBãã-127dBã¾ã§ã¢ããã
ã¼ã·ã§ã³ãã¾ãã¯ãã¥ã¼ãã§ãã¾ããè¨å®å¤éã®é·ç§»ã¯ã½ããé·ç§»ãæ¡ç¨ãã¦ããã®ã§é·ç§»ä¸ã«ã¹ã¤ããã³ã°ãã¤ãº
ã¯çºçãã¾ãããFFH(dB)ãã00H(MUTE)ã¾ã§ã«ã¯7424/fsãããã¾ããã¤ãã·ã£ã«ãªã»ããããã¨ã¢ãããã¼ã·ã§
ã³ã¬ãã«ã¯FFHã«åæåããã¾ããRSTN bit = â0âã«è¨å®ããã¨ãATTå¤ã¯FFHã«åæåããããã®å¾ãRSTN
bit = â1âã«è¨å®ããã¨ãATTå¤ã¯ããããã®è¨å®å¤ã¸å¾©å¸°ãã¾ããPCM mode ã¨DSD mode ãåãæ¿ãã¦ãã¬ã¸
ã¹ã¿è¨å®å¤ã¯ä¿æããã¾ãã
Sampling Speed
é·ç§»æé
0dB to MUTE
fs = 44.1kHz
168.3ms
fs = 96kHz
77.3ms
fs = 192kHz
38.6ms
Table 22. ATT é·ç§»æé
MS1560-J-01
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2013/11
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