AK4631 Datasheet, PDF (62/69 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4631]
„ εϐʔΧग़ྗ

FS3-0 bits
(Addr:05H,
D5,D2-0)
XXXX
DACM bit
(Addr:02H, D3)
ALC2S bit
(Addr:02H, D5)
(1)
(2)
ALC2 bit
(Addr:07H, D6)
DVOL7-0 bits
(Addr:0AH, D7-0)
PMDAC bit
(Addr:00H, D2)
PMSPK bit
(Addr:00H, D4)
SPPS bit
(Addr:02H, D7)
0
(3)
0001100
(4)
(5)
(6)
SPP pin
Hi-Z
XXXX
X
XXXXXXX
(7)
Normal Output
(8)
(9)
Hi-Z
Example:
PLL, Master Mode
Audio I/F Format :DSP Mode, BCKP=MSBS= “0”
Sampling Frequency: 8kHz
Digital Volume: -8dB
ALC2 : Enable
(1) Addr:05H, Data:00H
(2) Addr:02H, Data:28H
(3) Addr:07H, Data:40H
(4) Addr:0AH, Data:28H
(5) Addr:00H, Data:54H
(6) Addr:02H, Data:A8H
Playback
(7) Addr:02H, Data:28H
SPN pin
Hi-Z
SVDD/2 Normal Output SVDD/2 Hi-Z
(8) Addr:00H, Data:40H
Figure 48. Speaker-Amp Output Sequence
<खॱྫ>
ʮΫϩοΫͷઃఆʯͷ߲Λࢀর͠ɺΫϩοΫΛͯ͠څڙԼ͍͞ɻ
(1) αϯϓϦϯάप೾਺(FS3-0 bit)Λઃఆͯ͠Լ͍͞ɻPLLϞʔυͷ৔߹ɺαϯϓϦϯάप೾਺Λมߋ͔ͯ͠Βͷ
PLLϩοΫ࣌ؒΛߟྀ͠ɺ(5)ͷDACͼٴεϐʔΧͷύϫʔΞοϓΛߦͬͯԼ͍͞ɻ
(2) DAC Æ SPK-Ampͷύεͷઃఆɻ
DACM = ALC2S bit: “0” → “1”
(3) ALC2 ͷ༗ޮʗແޮ(ALC2bit)ͷઃఆɻ
(4) σΟδλϧϘϦϡʔϜ(ΞυϨε0AH)ͷઃఆɻ
DAC͕ύϫʔΞοϓ͞ΕͨޙɺDefault஋ (0dB) ͔Βઃఆͨ͠஋ʹιϑτભҠ͍͖ͯ͠·͢ɻ
(5) DACͼٴεϐʔΧͷύϫʔΞοϓ : PMDAC bit = PMSPK bit = “0” → “1”
ALC2 bit = “1”ͷ৔߹ɺॳظԽαΠΫϧத (512/fs =64ms (@fs=8kHz, ROTM bit = “0”)ɺALC2͸σΟη
ʔϒϧঢ়ଶʢALC2ͷήΠϯ͸ “–2dBݻఆ”ʣͰɺॳظԽαΠΫϧ͕ऴྃ͢ΔͱALC2͸ “–2dB”͔Β
ಈ࡞Λ։࢝͠·͢ɻ
(6) εϐʔΧͷύϫʔηʔϒϞʔυͷղআ : SPPS bit = “0” → “1”
(6) ͷ۠ؒ͸ɺMIN pin ͷೖྗ఍߅ ͱ MIN pin – MOUT pin ؒʹ઀ଓ͞ΕΔίϯσϯαͷ࣌ఆ਺ʹΑͬͯ
ܾఆͯ͠Լ͍͞ɻMIN-Amp (ALC2)ͷೖྗ͕҆ఆ͢ΔલʹSPK-Ampͷग़ྗΛEnableʹ͢ΔͱɺϙοϓԻ͕
ੜ͡ΔՄೳੑ͕͋Γ·͢ɻ
e.g. Input Impedance of MIN pin =36kΩ (max), C=0.1µFͷ৔߹: ਪ঑଴ͪ࣌ؒ 5τ = 18ms Ҏ্
(7) εϐʔΧͷύϫʔηʔϒϞʔυ΁Ҡߦ : SPPS bit = “1” → “0”
(8) DAC Æ SPK-AmpͷύεͷDisableɻ
DACM = ALC2S bit: “1” → “0”
(9) DACͼٴεϐʔΧͷύϫʔμ΢ϯ : PMDAC bit = PMSPK bit = “1” → “0”
MS0317-J-01
- 62 -
2004/11