AK4631 Datasheet, PDF (38/69 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4631]
SPK-Amp
ZD
≥10Ω
SPP
SPN
≥10Ω
ZD
Figure 34. SPKग़ྗճ࿏(ѹిεϐʔΧͱ઀ଓ͢Δ৔߹)
ʻεϐʔΧΞϯϓͷίϯτϩʔϧγʔέϯεʼ
PMSPK bitͰεϐʔΧϒϩοΫ(MOUT, ALC2, SPK-AMP)ͷPower-up/downΛ͢Δ͜ͱ͕Ͱ͖·͢ɻPMSPK bit
͕“0”ͷ৔߹ɺMOUT, SPP, SPN pin͸Hi-ZʹͳΓ·͢ɻ
PMSPK bit ͕ “1”ͷ࣌ɺSPPS bitΛ“0”ʹ͢ΔͱεϐʔΧΞϯϓ͸ύϫʔηʔϒϞʔυʹͳΓ·͢ɻ͜ͷ࣌ɺ
SPP pin͸Hi-ZɺSPN pin͸SVDD/2Λग़ྗ͠·͢ɻ
ݯి౤ೖޙɺPDN pinΛ“L”͔Β“H”ʹมߋ͠ɺPMSPK bitΛ“1”ʹ͢ΔͱɺSPP, SPN pin͸ύϫʔηʔϒϞʔυ
Ͱ্ཱ͕ͪΓ·͢ɻ͜ͷ࣌ɺSPP pin͸Hi-Zʹɺ SPN pin͸SVDD/2ʹͳΓ·͕͢ɺύϫʔηʔϒϞʔυͰཱͪ
্͛ΔͱɺϙοϓԻΛ௿ͤ͞ݮΔ͜ͱ͕Ͱ͖·͢ɻ·ͨɺPower-down࣌ (PMSPK bit=“0”)΋ύϫʔηʔϒϞ
ʔυΛܦ༝͢Δ͜ͱͰɺಉ༷ʹϙοϓԻΛ௿ͤ͞ݮΔ͜ͱ͕Ͱ͖·͢ɻ
PMSPK bit
SPPS bit
SPP pin
Hi-Z
Hi-Z
SPN pin _Hi-Z ^SVDD/2
SVDD/2
Hi-Z
>t1(Note)
>0
Figure 35. Power-up/Power-down Timing for Speaker-Amp
(Note)
“t1” ͸ MIN pin ͷೖྗ఍߅ ͱ MOUT pin – MIN pin ؒʹ઀ଓ͞ΕΔίϯσϯαͷ࣌ఆ਺ʹΑܾͬͯ·Γ·͢ɻ
MIN-Amp (ALC2)ͷೖྗ͕҆ఆ͢ΔલʹSPK-Ampͷग़ྗΛEnableʹ͢ΔͱɺϙοϓԻ͕ੜ͡ΔՄೳੑ͕͋Γ·
͢ɻ
Ex) MOUT pin – MIN pin ؒͷίϯσϯα=0.1 µF, MIN pin ͷೖྗ఍߅ 36kΩ(Max) ͷ৔߹: t1 = 5τ = 18ms
͜ͷ࣌ͷ MOUT pin – MIN pin ؒͷίϯσϯαͱ MIN pin ͷೖྗ఍߅(Rin)ʹΑͬͯߏ੒͞ΕΔ HPF ͷ
ΧοτΦϑप೾਺(fc)͸ҎԼͷΑ͏ʹͳΓ·͢ɻ
fc = 66Hz@Rin=24kΩ(typ), 133Hz@Rin=12kΩ(min), 44Hz@Rin=36kΩ(max)
MS0317-J-01
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2004/11