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AK5701KN_17 Datasheet, PDF (35/64 Pages) Asahi Kasei Microsystems – PLL & MIC-AMP内蔵16-Bit Stereo ADC | |||
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[AK5701]
â ALCåä½
ALC bit = â1âã®ã¨ããALCãããã¯ã«ãããALCåä½ãè¡ããã¾ãã
1. ALCãªããã¿åä½
ALCãªããã¿åä½ã§ã¯Lch, Rchã®åºåã¬ãã«ã®ã©ã¡ããä¸æ¹ã§ãALCãªããã¿æ¤åºè¨å®ã¬ãã«(Table 22)ãè¶
ããå ´åãLMAT1-0 bitã§è¨å®ããå¤(Table 23)ã ããIVL, IVRå¤(L/Rå
±é)ãèªåçã«æ¸è¡°ããã¾ãã
ZELMN bit = â0â(ã¼ãã¯ãã¹æ¤åºæå¹)ã®ã¨ããALCãªããã¿åä½ã«ããIVL, IVRå¤ãå¤æ´ãããã®ã¯ãL/Rç¬
ç«ã«ããããã¼ãã¯ãã¹ãããã¼ãã¯ãã¹ã¿ã¤ã ã¢ã¦ãããã¨ãã§ããã¼ãã¯ãã¹ã¿ã¤ã ã¢ã¦ãæéã¯ALC
ãªã«ããªæéã¨å
±éã§ãZTM1-0 bitã«ã¦è¨å®ã§ãã¾ã(Table 24)ã
ZELMN bit = â1â(ã¼ãã¯ãã¹æ¤åºç¡å¹)ã®ã¨ããALCãªããã¿åä½ã«ããIVL, IVRå¤ã¯ç¬æ(å¨æ: 1/fs)ã«å¤æ´ã
ãã¾ãããªããã¿åä½ã®æ¸è¡°éã¯LMAT1-0 bitã®è¨å®ã«ããããã1 stepåºå®ã§ãã
æ¸è¡°åä½çµäºå¾ã§ãALC bitã â0âã«ããªãéããåã³åºåã¬ãã«ãALCãªããã¿æ¤åºã¬ãã«ãè¶ããã°ãã
ã®æ¸è¡°åä½ã¯ç¹°ãè¿ããã¾ãã
LMTH1
0
0
1
1
LMTH0 ALCãªããã¿æ¤åºã¬ãã« ALCãªã«ããªå¾
æ©ã«ã¦ã³ã¿ãªã»ããã¬ãã«
0
ALC Output ï³ ï2.5dBFS
ï2.5dBFS > ALC Output ï³ ï4.1dBFS
1
ALC Output ï³ ï4.1dBFS
ï4.1dBFS > ALC Output ï³ ï6.0dBFS
0
ALC Output ï³ ï6.0dBFS
ï6.0dBFS > ALC Output ï³ ï8.5dBFS
1
ALC Output ï³ ï8.5dBFS
ï8.5dBFS > ALC Output ï³ ï12dBFS
Table 22. ALC ãªããã¿æ¤åºã¬ãã«ï¼ãªã«ããªå¾
æ©ã«ã¦ã³ã¿ãªã»ããã¬ãã«
(default)
ZELMN LMAT1 LMAT0 ALC ãªããã¿ATTã¹ããã
0
0
1 step
0.375dB (default)
0
0
1
1
2 step
0.750dB
0
4 step
1.500dB
1
1
8 step
3.000dB
1
x
x
1step
0.375dB
Table 23. ALC ãªããã¿ATTã¹ãããã®è¨å® (x: Donât care)
ZTM1
0
0
1
1
ZTM0
ã¼ãã¯ãã¹ã¿ã¤ã ã¢ã¦ãæé
8kHz
16kHz
44.1kHz
0
128/fs
16ms
8ms
2.9ms
1
256/fs
32ms
16ms
5.8ms
0
512/fs
64ms
32ms
11.6ms
1
1024/fs
128ms
64ms
23.2ms
Table 24. ALCã¼ãã¯ãã¹ã¿ã¤ã ã¢ã¦ãæéã®è¨å®
(default)
MS0404-J-04
- 35 -
2015/10
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