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AK4645AEZ Datasheet, PDF (36/85 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP | |||
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[AK4645A]
â ALCà²à¡
ALC bit = â1âͷͱÍɺALCÏϩοΫʹÎÎɺALCà²à¡ÍߦÎÎÎ͢ɻDACÍ·Îà²à¡ÍͤÎà§ß¹Éºà ¶à©Ïεʹ
à¬°Í Í¯ALCà²à¡ÍߦÎÎÎ͢ɻͦÎÒÖÍ·à§à¬¶Í°Í¸à¿¥Ô»ÏÎµÍ´à¬°Í Í¯ALCà²à¡ÍߦÎÎÎ͢ɻ
PMADL bit, PMADR bit
â00â
â01â, â10â or â11â
PMDAC bit LOOP bit
à§à¬¶
0
x
ÏÏ«Êμ΢ϯ
1
x
à ¶à©
0
x
à¿¥Ô»
1
0
à¿¥Ô», à ¶à©
1
à¿¥Ô»ÏÏλÊà ¶à©
Table 20. ALCà²à¡àªà° (x: Donât care)
ALC
ÏÏ«Êμ΢ϯ
à ¶à©Ïε
à¿¥Ô»Ïε
à¿¥Ô»Ïε
à¿¥Ô»Ïε
(default)
1. ALCϦÏολà²à¡
ALCϦÏολà²à¡Í°Í¸Lch, RchÍ·à¥à¾Ï¨ÏϧͷͲͪÎÍÒ°à¹Í°ÎALCϦÏολÝà¥àªà°Ï¨Ïϧ(Table 21)ÎÓ½
Íͨà§ß¹ÉºLMAT1-0 bitsÍ°àªà°Í ͨà®(Table 22)Í©ÍɺIVL, IVRà®(L/RÚ௨)Îà£à²à°¤Í´Ý®à¨°ÍͤÎ͢ɻ
ZELMN bit = â0â(θϩΫϩεÝà¥à¼Þ®)ͷͱÍɺALCϦÏολà²à¡Í´ÎÎIVL, IVRà®ÍมßÍÎÎͷ͸ɺL/R
ಠཱʹͦÎͧÎθϩΫϩε͢ÎÍθϩΫϩελΠÏÎ΢ÏÍ Í¨Í±ÍͰ͢ɻθϩΫϩελΠÏÎ΢Ïà£Ø͸
ZTM1-0 bitsʹͯàªà°Í°ÍÎÍ¢(Table 23)É»
ZELMN bit = â1â(θϩΫϩεÝà¥à»Þ®)ͷͱÍɺALCϦÏολà²à¡Í´ÎÎIVL, IVRà®Í¸à¥ à£(पظ: 1/fs)ʹมß
ÍÎÎ͢ɻϦÏολà²à¡Í·Ý®à¨°à¾Í¸LMAT1-0 bitsÍ·àªà°Í´ÍÍÎÎÍ£1 stepÝ»à°Í°Í¢É»
ݮਰà²à¡à¤´à¾Í°ÞÎALC bitÎ â0âݶÍÍ³Í Í´ÎÉºà ¶Í¼à¥à¾Ï¨ÏϧÍALCϦÏολÝà¥Ï¨ÏϧÎÓ½ÍÎ͹ɺÍ
ͷݮਰà²à¡Í¸ÜÎฦÍÎÎ͢ɻ
LMTH1
0
0
1
1
LMTH0 ALCϦÏολÝà¥Ï¨Ïϧ ALCϦΧÏϦ଴ػΧ΢ϯλϦηοÏϨÏϧ
0
ALC Output ⥠â2.5dBFS
1
ALC Output ⥠â4.1dBFS
â2.5dBFS > ALC Output ⥠â4.1dBFS
â4.1dBFS > ALC Output ⥠â6.0dBFS
0
ALC Output ⥠â6.0dBFS
1
ALC Output ⥠â8.5dBFS
â6.0dBFS > ALC Output ⥠â8.5dBFS
â8.5dBFS > ALC Output ⥠â12dBFS
Table 21. ALC ϦÏολÝà¥Ï¨ÏϧÊϦΧÏϦ଴ػΧ΢ϯλϦηοÏϨÏϧ
(default)
ZELMN LMAT1 LMAT0 ALC ϦÏολATTεÏοÏ
0
0
1 step
0.375dB (default)
0
0
1
2 step
0.750dB
1
0
4 step
1.500dB
1
1
8 step
3.000dB
1
x
x
1step
0.375dB
Table 22. ALC ϦÏολATTεÏοÏÍ·àªà° (x: Donât care)
ZTM1
0
0
1
1
ZTM0
θϩΫϩελΠÏÎ΢Ïà£Ø
8kHz
16kHz
44.1kHz
0
128/fs
16ms
8ms
2.9ms
1
256/fs
32ms
0
512/fs
64ms
16ms
32ms
5.8ms
11.6ms
1
1024/fs
128ms
64ms
23.2ms
Table 23. ALCθϩΫϩελΠÏÎ΢Ïà£ØÍ·àªà°
(default)
MS0986-J-00
- 36 -
2008/07
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