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AK5701KN_17 Datasheet, PDF (36/64 Pages) Asahi Kasei Microsystems – PLL & MIC-AMP内蔵16-Bit Stereo ADC | |||
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[AK5701]
2. ALCãªã«ããªåä½
ALCãªã«ããªåä½ã¯ãWTM1-0ã§è¨å®ãããæé(Table 25)å¾
æ©ãè¡ãããã®éãåºåä¿¡å·ãALCãªã«ããªå¾
æ©ã«ã¦ã³ã¿ãªã»ããã¬ãã«(Table 22)ãè¶ããã¨ããªããã°ALCãªã«ããªåä½ãè¡ãã¾ãããã®ALCãªã«ããª
åä½ã¯è¨å®ãããåºæºã¬ãã«(Table 27) ã¾ã§ZTM1-0ã§è¨å®ããæé(Table 24)ã§ã¼ãã¯ãã¹æ¤åºåä½ãè¡ã
ãªãããRGAIN1-0 bitã§è¨å®ããå¤(Table 26)ã ãIVL, IVRå¤(L/Rå
±é)ãèªåçã«å¢å ããã¾ãããã®ALCãª
ã«ããªåä½ã¯WTM1-0ã§è¨å®ããå¨æã§è¡ããã¾ãããã ããWTM1-0ã®è¨å®ããZTM1-0ã®è¨å®ãé·ããä¿¡
å·ãã¼ãã¯ãã¹ããªãå ´åãZTM1-0ã®å¨æã§ALCãªã«ããªåä½ãè¡ããã¾ãã
ä¾ãã°ãç¾å¨ã®IVL, IVRå¤ã30Hã®å ´åãRGAIN1-0 bit = â01â(2 steps)ã«è¨å®ãã¦ããã¨ãALCãªã«ããªåä½
ã«ãã£ã¦IVL, IVRå¤ã¯32Hã«å¤æ´ããã0.75dB(0.375dB x 2)å¢å ããã¾ããIVL, IVRå¤ãåºæºã¬ãã« (REF7-0)
ã«éããå ´åãIVL, IVRå¤ã®å¢å ã¯è¡ãã¾ããã
ã¾ããALCãªã«ããªå¾
æ©ä¸ã«
(ãªã«ããªå¾
æ©ã«ã¦ã³ã¿ãªã»ããã¬ãã«) ï£ Output Signal < (ãªããã¿æ¤åºã¬ãã«)
ã¨ãªã£ã¦ããå ´åãå¾
æ©ã¿ã¤ãã¯ãªã»ããããã¾ãããã®ããã
(ãªã«ããªå¾
æ©ã«ã¦ã³ã¿ãªã»ããã¬ãã«) > Output Signal
ã¨ãªã£ãæãããå¾
æ©æéã®ã«ã¦ã³ããéå§ããã¾ãã
ã¾ããALCåä½ã¯ã¤ã³ãã«ã¹æ§ã®ãã¤ãºã«ã対å¿ããALCã«ãªã£ã¦ãã¾ããã¤ã³ãã«ã¹æ§ã®ãã¤ãºãå
¥åã
ããå ´åãé常ã®ãªã«ããªåä½ãããæ©ããµã¤ã¯ã«ã§ãªã«ããªåä½ãè¡ãã¾ããä¾ãã°ããã¤ã¯ããã©ã³ã«
ç¬éçã«å¤§ããªé³ãå
¥åãããå ´åããã®åä½ã«ãã大ããªé³ã«åãããå°ä¿¡å·ãæ¹åãããã¨ãã§ãã¾
ãã
WTM1
0
0
1
1
WTM0
0
1
0
1
ALCãªã«ããªå¨æ
8kHz
16kHz
44.1kHz
128/fs
16ms
8ms
2.9ms
256/fs
32ms
16ms
5.8ms
512/fs
64ms
32ms
11.6ms
1024/fs
128ms
64ms
23.2ms
Table 25. ALCãªã«ããªå¾
æ©æéã®è¨å®
(default)
RGAIN1 RGAIN0
GAIN STEP
0
0
1 step
0.375dB
0
1
2 step
0.750dB
1
0
3 step
1.125dB
1
1
4 step
1.500dB
Table 26. ALC ãªã«ããªã²ã¤ã³éã®è¨å®
(default)
REF7-0
GAIN(dB)
Step
F1H
+36.0
F0H
+35.625
EFH
+35.25
:
:
E2H
+30.375
E1H
+30.0
0.375dB (default)
E0H
+29.625
:
:
03H
ï53.25
02H
ï53.625
01H
ï54.0
00H
MUTE
Table 27. ALCãªã«ããªåä½æã®åºæºå¤è¨å®
MS0404-J-04
- 36 -
2015/10
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