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AK4495SEQ Datasheet, PDF (22/58 Pages) Asahi Kasei Microsystems – Quality-oriented Premium 32-Bit 2ch DAC | |||
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[AK4495S]
9. æ©è½èª¬æ
â D/Aå¤æã¢ã¼ã
AK4495Sã¯PCMãã¼ã¿ã¨DSDãã¼ã¿ã®ä¸¡æ¹ãD/Aå¤æãããã¨ãå¯è½ã§ããDSD modeæã¯ãDCLK,
DSDL, DSDRã®åãã³ããDSDãã¼ã¿ãå
¥åã§ãã¾ããPCM modeã§ã¯BICK, LRCK, SDATAã®åãã³ã
ãPCMãã¼ã¿ãå
¥åãã¾ããã¢ã¼ãåãæ¿ãã¯D/P bitã§è¡ãã¾ããD/P bitã§PCM/DSD modeãåãæ¿ã
ãå ´åã¯RSTN bitã§ãªã»ãããã¦ä¸ãããåãæ¿ãã«ã¯2 ~ 3/fsç¨åº¦ãããã¾ãããã©ã¬ã«ã¢ã¼ãæã¯PCM
ãã¼ã¿ã®ã¿ã«å¯¾å¿ãã¾ãã
D/P bit Interface
0
PCM
1
DSD
Table 1. PCM/DSD Mode Control
ã¾ããDP bit= â0âã®å ´åãå
é¨Digital Filterã¨å¤é¨Digital Filter I/Fãé¸æãããã¨ãå¯è½ã§ããå¤é¨Digital
Filter I/F使ç¨æ(EX DF I/F mode)ã¯ãMCLK, BCK, WCK, DINL, DINRã®åãã³ãããã¼ã¿ãå
¥åãã¾ãã
ã¢ã¼ãåæ¿ã¯EXDF bitã§è¡ãã¾ããEXDF bitã§å
é¨Digital Filterã¨å¤é¨Digital Filter I/Fãåæ¿ããå ´åã¯
RSTN bitã§ãªã»ãããã¦ä¸ãããåãæ¿ãã«ã¯2 ~ 3/fsç¨åº¦ãããã¾ãã
EXDF bit Interface
0
PCM
1
EX DF I/F
Table 2. Digital Filter Control (DP bit = â0â)
â ã·ã¹ãã ã¯ããã¯
[1] PCM mode
AK4495Sã«å¿
è¦ãªã¯ããã¯ã¯ãMCLK, BICK, LRCKã§ããMCLKã¨LRCKã¯åæããå¿
è¦ã¯ããã¾ãã
ä½ç¸ãåãããå¿
è¦ã¯ããã¾ãããMCLKã¯ã¤ã³ã¿ã¼ãã¬ã¼ã·ã§ã³ãã£ã«ã¿ã¨ïïå¤èª¿å¨ã«ä½¿ç¨ããã¾
ããMCLKå¨æ³¢æ°ãè¨å®ããæ¹æ³ã¯(Manual Setting Mode) ã¨ããã¤ã¹å
é¨ã§èªåè¨å®ããæ¹æ³ (Auto
Setting Mode) ã®ï¼ã¤ãããã¾ããManual Setting Mode (ACKS pin = âLâ, Normal Speed mode)ã§ã¯ãMCLK
å¨æ³¢æ°ã¯èªåè¨å®ããã¾ã(Table 4)ããªã»ãã解é¤æ (PDN pin = âïâ) ã¯Auto Setting Mode ã«è¨å®ããã¾
ãã Auto Setting Mode (ACKS pin = âHâ) ã§ã¯ããµã³ããªã³ã°ã¹ãã¼ãã¨MCLKå¨æ³¢æ°ã¯èªåæ¤åºãã
(Table 5)ãå
é¨ã¯ããã¯ã¯é©åãªå¨æ³¢æ° (Table 6) ã«èªåè¨å®ããã¾ãã
åä½ä¸ã«MCLKã¾ãã¯LRCKãæ¢ã¾ã£ãå ´åã¯ãAK4495Sã¯èªåçã«ãªã»ããç¶æ
ã«ãªããã¢ããã°åº
åã¯AVDD/2é»å§(typ)ãåºåãã¾ããMCLKã¨LRCKãåå
¥åå¾ããªã»ããç¶æ
ã解é¤ããåä½ãåéã
ã¾ããé»æº ON æ 㯠MCLKã¨LRCKãå
¥åãããã¾ã§ãã¯ã¼ãã¦ã³ç¶æ
ã§ãã
åã¹ãã¼ãã§ã®MCLKå¨æ³¢æ°ã¯Table 3ã§ç¤ºãããå¨æ³¢æ°ãå¤é¨ããä¾çµ¦ãã¦ä¸ããã
(1) ãã©ã¬ã«ã¢ã¼ã (PSN pin = âHâ)
1. Manual Setting Mode (ACKS pin = âLâ)
åã¹ãã¼ãã§ã®MCLKå¨æ³¢æ°ã¯Table 3ã§ç¤ºãããå¨æ³¢æ°ãå¤é¨ããä¾çµ¦ãã¦ä¸ãããDFS1 bitã¯â0âã«åº
å®ããã¾ãããã®ã¢ã¼ãã¯ã4åéã«ã¯å¯¾å¿ãã¦ãã¾ããã
MS1560-J-01
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2013/11
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