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AK5701KN_17 Datasheet, PDF (39/64 Pages) Asahi Kasei Microsystems – PLL & MIC-AMP内蔵16-Bit Stereo ADC | |||
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[AK5701]
IVL7-0, IVR7-0 bitã®æ¸ãè¾¼ã¿ãç¶ãã¦è¡ãå ´åã¯ãã¼ãã¯ãã¹ã¿ã¤ã ã¢ã¦ãæé以ä¸ã®ééãããã¦è¡ã£ã¦
ä¸ãããæå®ã®ééããããªãã§æ¸ãè¾¼ã¿ãè¡ãã¨ãã¼ãã¯ãã¹ã«ã¦ã³ã¿ãæ¯åãªã»ããããããªã¥ã¼ã ã
åãæ¿ããã¾ããããã ããæ¸ãè¾¼ãã¬ã¸ã¹ã¿å¤ãååã¨åãå¤ã®å ´åã¯æ¸ãè¾¼ã¿ãç¡è¦ãããã¼ãã¯ãã¹
ã«ã¦ã³ã¿ã¯ãªã»ãããããªãã®ã§ãã¼ãã¯ãã¹ã¿ã¤ã ã¢ã¦ãæéããçãééã§æ¸ãè¾¼ã¿ãè¡ããã¨ãã§ã
ã¾ãã
ALC bit
ALC Status
Disable
Enable
Disable
IVL7-0 bits
E1H(+30dB)
IVR7-0 bits
C6H(+20dB)
Internal IVL
Internal IVR
E1H(+30dB)
C6H(+20dB)
E1(+30dB) --> F1(+36dB)
(1)
E1(+30dB) --> F1(+36dB)
E1(+30dB)
(2)
C6H(+20dB)
Figure 40. ALCåä½ä¸ã®IVOLåä½ä¾
(1) ALCéå§æã«IVLã¨IVRã®å¤ãç°ãªã£ã¦ããå ´åã¯ãIVLã®å¤ãã¹ã¿ã¼ãå¤ã«ãªãã¾ããALC bit = â1âã
æ¸ãè¾¼ãã§ããIVL7-0 bitsã®å¤ã§ALCåä½ãéå§ããã¾ã§ã®å¾
ã¡æéã¯æ大ã§ãªã«ããªå¾
æ©æé
(WTM1-0 bits) + ã¼ãã¯ãã¹ã¿ã¤ã ã¢ã¦ãæé(ZTM1-0 bits)ã§ãã
(2) ALCåä½ä¸ã¯ãIVL, IVRã®ã¬ã¸ã¹ã¿(18H, 19H)ã«æ¸ãè¾¼ã¿ãè¡ã£ã¦ãåæ ããã¾ãããALCãDisableãã
ãå¾ãã¼ãã¯ãã¹ã¾ãã¯ã¼ãã¯ãã¹ã¿ã¤ã ã¢ã¦ãæã«ãã®å¤ãåæ ããã¾ããå度ALCãEnableããå ´
åã¯ãALC bit = â0âã®å¾ãã¼ãã¯ãã¹ã¿ã¤ã ã¢ã¦ãæé以ä¸ã®ééã空ãã¦ALC bit = â1âãè¨å®ãã¦ä¸ã
ãã
â ã·ã¹ãã ãªã»ãã
é»æºç«ã¡ä¸ãæã«ã¯ãPDN pinã«ä¸åº¦ âLâãå
¥åãã¦ãªã»ãããè¡ã£ã¦ä¸ãããã·ã¹ãã ãªã»ãããè¡ããã
ã¨ãAK5701ã®å
é¨ã¬ã¸ã¹ã¿ã¯å
¨ã¦åæå¤ã«ãªãã¾ãã
PMADL=PMADR bits = â0âã®ç¶æ
ããPMADL bitã¾ãã¯PMADR bitã â0â ï® â1âã«å¤æ´ãããã¨ã§ãADCã®å
æåãµã¤ã¯ã«ãéå§ããã¾ããåæåãµã¤ã¯ã«ã¯HPF1-0 bits = â00âã®ã¨ã3088/fs=70.0ms@fs=44.1kHzã§ã
(Table 30)ãåæåãµã¤ã¯ã«ä¸ã®ADCåºåãã¼ã¿ã¯2âsã³ã³ããªã¡ã³ãã® â0âã§ããåæåãµã¤ã¯ã«çµäºå¾ãADC
ã®åºåã¯ã¢ããã°å
¥åä¿¡å·ã«ç¸å½ãããã¼ã¿ã«ã»ããªã³ã°ãã¾ãã
HPF1 bit
0
0
1
1
HPF0 bit
0
1
0
1
Cycle
3088/fs
1552/fs
Init Cycle
fs=44.1kHz
fs=22.05kHz
70.0ms
(æ¨å¥¨å¤)
140.0ms
35.2ms
70.4ms
(æ¨å¥¨å¤)
784/fs
17.8ms
35.6ms
N/A
N/A
N/A
Table 30. ADCåæåãµã¤ã¯ã«è¨å® (N/A: Not available)
fs=11.025kHz
280.1ms
140.8ms
71.1ms
(æ¨å¥¨å¤)
N/A
(default)
MS0404-J-04
- 39 -
2015/10
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