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AK2308LV Datasheet, PDF (14/36 Pages) Asahi Kasei Microsystems – AK2308LV | |||
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ASAHI KASEI
[AK2308LV]
âLF/SF ã®å¤å®æ³
AK2308LVã¯å
¥åãããFSã®âHâæéã«ããLong FrameãShort Frameããèªåçã«å¤æãã¾ãã
FS=âHâã®æé
ãã¬ã¼ã æ§æ
BCLKã®2å¨æ以ä¸
LF
BCLKã®1å¨æ
SF
âã¤ã³ã¿ãã§ã¼ã¹ã¿ã¤ãã³ã°
PCM ãã¼ã¿ã¯ããã¬ã¼ã åæä¿¡å· FS ã«åæãã¦ã1 ãã¬ã¼ã åºé(125μs)æ¯ã« 8 ãããã®ãã¼ã¿ã DX,DR
端åããå
¥åºåããã¾ãã1 ãã¬ã¼ã åºéã«ã¯æ大 32 åã®ã¿ã¤ã ã¹ããã(BCLK=2.048MHz æ)ãããã¾ã
ããï¼ã¿ã¤ã ã¹ãããæ°ï¼BCLK/64kHzï¼AK2308LV ã®ä½¿ç¨ããã¿ã¤ã ã¹ãããã¯åæä¿¡å· FS ãã決ãã
ããåºå®ä½ç½®ã§å
¥åºåããã¾ãã詳ããã¯å¾è¿°ã®ã¿ã¤ãã³ã°å³ãåç
§ä¸ããã
âãã¬ã¼ã åæä¿¡å·ï¼Frame Syncï¼FSï¼
8kHz ã®åºæºå
¥åä¿¡å·ã§ãã1 ãã¬ã¼ã (125μs æ¯)ã« 8 ãããã® PCM ãã¼ã¿ãå
¥åºåããã¾ããBCLK ã¨å
æãã¦ãããã¨ãå¿
è¦ã§ããFS 㯠PLL ã®å
¥åã¨ãªããããããã¨ã«å
é¨ã®åä½ã¯ããã¯ãçæããã¾ãã
âBCLK
PCM ãã¼ã¿ã¬ã¼ããå®ãã¾ãã64kHzï½2.048MHz ã®ç¯å²ã® 64kHzÃN(N=1ï½32)ã®ã¬ã¼ãã«å¯¾å¿ã§ãã¾
ãã
LongFrame
FS
BCLK
DX
1 2 3 4 5 6 78
DR
Donât
care
1
2
3
4
5
6
7
8
Hi-Z
Donât care
ShortFrame
FS
BCLK
DX
DR
Donât
care
1 2 3 4 5 6 78
12345678
Hi-Z
Donât care
ï¼æ³¨æäºé
ï¼éè¦ï¼
FS 㨠BCLK ã®ä¾çµ¦ãåæ¢ããªãã§ä¸ããã
FS 㨠BCLK ã®ã©ã¡ãããåæ¢ãã㨠AK2308LV ã® PLL ã¯èªèµ°å¨æ³¢æ°ã§åä½ããæ£ç¢ºãª 8kHz å¨æã®åä½
ããããã¨ãåºæ¥ã¾ããã
<AK2308LV>
14
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