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AK5730VQ_17 Datasheet, PDF (20/50 Pages) Asahi Kasei Microsystems – 4-Channel Differential Audio ADC for Line & Mic Inputs | |||
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[AK5730]
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â ã·ã¹ãã ã¯ããã¯
ãã¹ã¿ã¢ã¼ãã¨ã¹ã¬ã¼ãã¢ã¼ãã®åãæ¿ãã¯MSN pin ã§è¡ãã¾ããMSN pin = âHâ ã§ãã¹ã¿ã¢ã¼ããâLâ ã§ã¹ã¬ã¼ãã¢ã¼
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ã¹ã¬ã¼ãã¢ã¼ãæãAK5730ã«å¿
è¦ã¨ãããã¯ããã¯ã¯å
èµã®PLLã使ç¨ããå ´åã¨ããªãå ´åï¼PLL1-0 bitsï¼ ã§
ç°ãªãã¾ãã
(1) PLLã使ç¨ããªãå ´å
ã¯ããã¯ã¨ãã¦MCLKI, BICK, LRCK (fs)ãå
¥åãã¾ããMCLKIã¨LRCKã¯åæããå¿
è¦ã¯ããã¾ãããä½ç¸
ãåãããå¿
è¦ã¯ããã¾ãããé»æºãç«ã¡ä¸ããªã»ãã解é¤ããå¾ã¯ãMCLKI, LRCK, BICKãå
¥åãããã¾ã§ãã¯
ã¼ãã¦ã³ã¢ã¼ãã§ãã
(2) PLLã使ç¨ããå ´å
ã¯ããã¯ã¨ãã¦BICKã¨LRCKãå
¥åãã¾ããé»æºãç«ã¡ä¸ããªã»ãã解é¤ããå¾ã¯ãBICK , LRCKãå
¥åãããã¾
ã§ãã¯ã¼ãã¦ã³ã¢ã¼ãã§ãã
Table 1 ã«ãµã³ããªã³ã°å¨æ³¢æ°fsã¨ãã¹ã¿ã¯ããã¯MCLKå¨æ³¢æ°ããããã¯ããã¯BICKå¨æ³¢æ°ã®é¢ä¿ãè¨ãã¾ãããµã³ããª
ã³ã°ã¬ã¼ãã¯FS0 bit 㨠FS1 bit ã§è¨å®ãã¾ã (Table 3)ã
ãã¹ã¿ã¢ã¼ãæãAK5730ã«å¿
è¦ã¨ãããã¯ããã¯ã¯MCLKI ã®ã¿ã§ããCKS 1-0 bit ã§ãã¹ã¿ã¯ããã¯å¨æ³¢æ°
ã(Table 2)ãFS1-0 bitã§ãµã³ããªã³ã°å¨æ³¢æ°ãè¨å®ãã¾ããé»æºãç«ã¡ä¸ããªã»ãã解é¤ããå¾ã¯ãMCLKI ãå
¥
åãããã¾ã§ãã¯ã¼ãã¦ã³ã¢ã¼ãã§ããTDM256 modeã®ã¨ãã¯ãã¹ã¿ã¯ããã¯å¨æ³¢æ°ã256fsã¨ãã¦ãã ããã
LRCK
fs
8kHz
32kHz
44.1kHz
48kHz
256fs
2.048
8.192
11.2896
12.288
MCLK (MHz)
384fs
3.072
12.288
16.9344
18.432
512fs
4.096
16.384
22.5792
24.576
BICK (MHz)
64fs
0.512
2.048
2.8224
3.072
Table 1. ã·ã¹ãã ã¯ããã¯ä¾
CKS1 bit CKS0 bit
Clock Speed
0
0
256fs
0
1
384fs
1
0
512fs
(default)
1
1
(reserved)
Table 2. ãã¹ã¿ã¯ããã¯ã³ã³ããã¼ã« (Master Mode)
FS1 bit
0
0
1
1
FS0 bit
Sampling Rate
0
24kHz â 48kHz
1
12kHz â 24kHz
0
8kHz â 12kHz
1
8kHz â 12kHz (reserved)
Table 3. ãµã³ããªã³ã°ã¬ã¼ã (fs)
(default)
MS1577-J-03
- 20 -
2015/11
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