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AK4642VN Datasheet, PDF (73/82 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Stereo CODEC with MIC/HP/SPK-AMP | |||
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ASAHI KASEI
[AK4642]
 ÏΠΫà³à¾à¿¥Ô» εÏϨΦ
FS3-0 bits X,XXX
(Addr:05H, D5&D2-0)
(1)
MIC Control
(Addr:02H, D2-0)
ALC Control 1
(Addr:06H)
ALC Control 2
(Addr:08H)
001
(2)
XXH
(3)
XXH
(4)
ALC Control 3
(Addr:0BH)
ALC Control 4
(Addr:07H)
ALC State
XXH
(5)
XXH
(6)
ALC Disable
1,111
101
28H
E1H
00H
21H
ALC Enable
01H
(9)
ALC Disable
PMADL/R bit
(Addr:00H&10H, D0)
ADC Internal
State
Power Down
1059 / fs
(7)
(8)
Initialize Normal State Power Down
Example:
PLL Master Mode
Audio I/F Format:MSB justified (ADC & DAC)
Sampling Frequency:44.1kHz
Pre MIC AMP:+20dB
MIC Power On
ALC setting:Refer to Figrure 23
ALC bit=â1â
(1) Addr:05H, Data:27H
(2) Addr:02H, Data:05H
(3) Addr:06H, Data:28H
(4) Addr:08H, Data:E1H
(5) Addr:0BH, Data:00H
(6) Addr:07H, Data:21H
(7) Addr:00H, Data:41H
Addr:10H, Data:01H
Recording
(8) Addr:00H, Data:40H
Addr:10H, Data:00H
(9) Addr:07H, Data:01H
Figure 50. MIC Input Recording Sequence
<à¤à¥±à¾«>
fs=44.1kHzà£Í·ALCÍ·àªà°à¾«Í°Í¢É»ALCÍ·ÏÏ¥ÏÊλÎมßÍ¢Îà§ß¹Í¸Éº âFigure 24. ALCà²à¡àªà°à¤à¥±
ྫâÎà¢à¦°Í ͯԼÍÍÉ»
ʮΫϩοΫͷàªà°Ê¯Í·ß²Îà¢à¦°Í ɺΫϩοΫÎÍ¯Í Ú
ÚÔ¼ÍÍÉ»
(1) αϯÏϦϯάप೾਺(FS3-0 bits)Îàªà°Í ͯԼÍÍÉ»PLLÏÊÏ
Í·à§ß¹ÉºÎ±Ï¯ÏϦϯάप೾਺ÎมßÍ
ͯÍÎÍ·PLLϩοΫà£ØÎßà¾Í ɺ(7)Í·ÏΠΫͼٴADCÍ·ÏÏ«ÊÎοÏÎߦͬͯԼÍÍÉ»
(2) ÏΠΫà³à¾(ÎÏ
Ϩε 02H)Í·àªà°É»
(3) ALC Timer (ÎÏ
Ϩε 06H)Í·àªà°
(4) ALC REFà®(ÎÏ
Ϩε 08H)Í·àªà°
(5) LMTH1, RGAIN1 bitsÍ·àªà°(ÎÏ
Ϩε 0BH)
(6) LMTH0, RGAIN0, LMAT1-0, ALC bitsÍ·àªà°(ÎÏ
Ϩε 07H)
(7) ÏΠΫͼٴADCÍ·ÏÏ«ÊÎÎ¿Ï : PMADL = PMADR bits = â0â â â1â
ADCͷॳظԽαΠΫϧ͸1059/fs=24ms@fs=44.1kHzͰ͢ɻ
ALC͸à³à¾ÏÎδλϧÏϦϡÊÏ(IVL/R7-0 bits)ͷॳظà®(+30dB)ÍÎà²à¡ÎÖà¢Í Î͢ɻ
ظॳԽαΠΫϧऴà¾ÞɺΦÏηοÏిѹÍऩà¬Í¢ÎÎÍ°Í·à£Ø͸ÎÏϩάà³à¾ÏϯÍίÏϯిѹʹ
ऩà¬Í¢ÎÎÍ°à£ØͱÏÎδλϧHPFÍ·à£à°à¨ºÍ´Òà¬Í Î͢ɻऩà¬à£ØÎà¹à¥Í¢Îʹ͸ɺPMVCM bit =
â1âÍ´à¬ÍͯPMMP bit = â1âÎàªà°Í ɺÎÏϩάà³à¾Í·ACΧοÏϦϯάίϯÏϯαͱ60k(typ)ͰܾÎ
Îà£à°à¨ºÍ·4à´Ü¦Õ¡ÞɺADCÎPower-upÍ¢Îà¹à¹ÍÍÎÎ͢ɻ
(8) ÏΠΫͼٴADCÍ·ÏÏ«Êμ΢ϯ: PMADL = PMADR bits = â1â â â0â
ÏΠΫͼٴADCÎÏÏ«Êμ΢ϯ͢ÎÍͱͰALCÎDisableà§à¬¶Í´Í³ÎÎ͢ɻαϯÏϦϯάप೾਺Îม
ßÍ ÉºALCÍ·àªà°ÎมßÍ¢Îà§ß¹Í¸ÉºÏÏÏ¡ÎϧÏÊÏ
(ALC bit = â0â) ÍÎÍ͸ÏΠΫͼٴADCÎÏ
Ï«Êμ΢ϯ(PMADL = PMADR bits = â0â)Í Í¯ÍÎߦͬͯԼÍÍÉ»ÎͨɺPMADL = PMADR bits = â0â
ͷͱÍɺà³à¾ÏÎδλϧÏϦϡÊÏ(IVL/R7-0 bits)ͷήΠϯ͸ϦηοÏÍÎͣɺà£Í·ÏÏ«ÊÎοÏà£
͸ίϯÏÏ©ÊϧϨδελͷàªà°à®Í°à²à¡ÎÖà¢Í Î͢ɻ
(9) ALC Disable: ALC bit = â1â â â0â
MS0358-J-02
- 73 -
2005/04
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