AK4631 Datasheet, PDF (33/69 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4631]
„ ϚχϡΞϧϞʔυ
AK4631͸ALC1 bit = “0”ͷ࣌ɺϚχϡΞϧϞʔυʹͳΓ·͢ɻ͜ͷϞʔυ͸ҎԼͷ৔߹ʹ࢖༻͠·͢ɻ
1. ϦηοτղআޙɺALC1ಈ࡞ʹؔ͢ΔϨδελઃఆʢZTM1-0, LMTHͳͲʣΛߦ͏৔߹
2. αϯϓϦϯάप೾਺ͷมߋʹ൐͍ɺϦϛολʗϦΧόϦपͲͳظALC1ಈ࡞ʹؔ͢ΔϨδελͷมߋ
Λߦ͏৔߹
3. IPGAΛϚχϡΞϧϘϦϡʔϜͱͯ͠࢖༻͢Δ৔߹
ϚχϡΞϧಈ࡞Ϟʔυ࣌ʹ IPGA6-0 bits ΁ॻ͖ࠐΈΛߦ͏ͱɺθϩΫϩεΧ΢ϯλ͸Ϧηοτ͞ΕΧ΢ϯτ
͕։࢝͞Ε·͢ɻೖྗ৴߸͕θϩΫϩε͢Δ͔ɺ·ͨ͸θϩΫϩελΠϜΞ΢τͨ࣌͠ʹॳΊͯॻ͖ࠐ·Ε
ͨ஋͕༗ޮʹͳΓ·͢ɻθϩΫϩελΠϜΞ΢τ࣌ؒ͸ ZTM1-0 bits ͰઃఆͰ͖·͢ɻ
IPGA6-0 bit΁ͷॻ͖ࠐΈ͸θϩΫϩελΠϜΞ΢τ࣌ؒҎ্ͷִؒΛ͚͋ͯߦͬͯԼ͍͞ɻ
„ MIC – ALC ಈ࡞
ALC1 bit = “1”ͷ࣌ɺALC1ϒϩοΫʹΑΓɺϚΠΫೖྗͷALCಈ࡞͕ߦΘΕ·͢ɻ
[1] ALC1Ϧϛολಈ࡞
ALC1Ϧϛολಈ࡞Ͱ͸ɺIPGAͷग़ྗϨϕϧ͕ALC1Ϧϛολݕग़ઃఆϨϕϧ(LMTH)Λӽ͑ͨ৔߹ɺALC1
ϦϛολATTεςοϓ(LMAT1-0 bit)෼͚ͩࣗಈతʹIPGA஋Λݮਰͤ͞·͢ɻ
ZELM bit=“1”ͷ࣌ɺ͜ͷݮਰಈ࡞͸LTM1-0 bitͰઃఆ͞ΕͨपͰظɺIPGAͷग़ྗϨϕϧ͕LMTHҎԼʹͳΔ
·Ͱ࿈ଓతʹߦΘΕ·͢ɻ·ͨɺݮਰಈ࡞ऴྃͰޙ΋ALC1 bitΛ“0”ݶ͍ͳ͠ʹΓɺ࠶ͼIPGAͷग़ྗϨϕϧ
͕LMTHΛӽ͑Ε͹ɺ͜ͷݮਰಈ࡞͸܁Γฦ͞Ε·͢ɻ
ZELM bit=“0”ͷ࣌ɺALC1Ϧϛολಈ࡞͸ZTM1-0 bitͰઃఆͨ࣌ؒ͠ͰθϩΫϩεݕग़ಈ࡞Λߦ͍ͳ͕Βɺ
IPGA஋Λࣗಈతʹݮਰͤ͞·͢ɻ
[2] ALC1ϦΧόϦಈ࡞
ALC1ϦΧόϦಈ࡞͸ɺWTM1-0 bitͰઃఆ͞Ε͚ͨ࣌ؒͩ଴ػΛߦ͍ɺ͜ͷؒɺIPGAͷग़ྗ৴߸͕ϦΧόϦ
଴ػΧ΢ϯλϦηοτϨϕϧΛӽ͑Δ͜ͱ͕ͳ͚Ε͹ɺALC1ϦΧόϦಈ࡞Λߦ͍·͢ɻ͜ͷALC1ϦΧόϦ
ಈ࡞͸ઃఆ͞Εͨج४Ϩϕϧ(REF6-0 bit)·ͰɺZTM1-0 bitͰઃఆͨ࣌ؒ͠ͰθϩΫϩεݕग़ಈ࡞Λߦ͍ͳ͕
ΒɺIPGA஋Λࣗಈతʹ૿Ճͤ͞·͢ɻ͜ͷALC1ϦΧόϦಈ࡞͸WTM1-0 bitͰઃఆͨ͠पߦͰظΘΕ·͢ɻ
WTM1-0 bitͰઃఆͨؒ͠ظதʹθϩΫϩεಈ࡞͕ऴྃͨ͠৔߹ɺWTM1-0 bitͰઃఆͨ͠Ͱ·ؒظ଴ͯ͠ػɺ
࣍ͷϦΧόϦಈ࡞ʹೖΓ·͢ɻ
ALC1ϦΧόϦಈ࡞தɺIPGAͷग़ྗϨϕϧ͕ALC1Ϧϛολݕग़ઃఆϨϕϧ(LMTH)Λӽ͑ͨ৔߹ɺ௚ͪʹ
ALC1Ϧϛολಈ࡞ʹೖΓ·͢ɻ
·ͨɺALC1ϦΧόϦ଴ػதʹ
(ϦΧόϦ଴ػΧ΢ϯλϦηοτϨϕϧ) ≤ ʢIPGAग़ྗϨϕϧʣ < (Ϧϛολݕग़Ϩϕϧ)
ͱͳ͍ͬͯΔ৔߹ɺ଴ػλΠϚ͸Ϧηοτ͞Ε·͢ɻͦͷͨΊɺ
(ϦΧόϦ଴ػΧ΢ϯλϦηοτϨϕϧ) > ʢIPGAग़ྗϨϕϧʣ
ͱͳ͔ͬͨ࣌Βɺ଴ؒ࣌ػͷΧ΢ϯτ͕։࢝͞Ε·͢ɻ
·ͨɺALC1ಈ࡞͸ΠϯύϧεੑͷϊΠζʹ΋ରԠͨ͠ALCʹͳ͍ͬͯ·͢ɻΠϯύϧεੑͷϊΠζ͕ೖྗ
͞Εͨ৔߹ɺ௨ৗͷϦΧόϦಈ࡞ΑΓ΋ૣ͍αΠΫϧͰϦΧόϦಈ࡞Λߦ͍·͢ɻ
MS0317-J-01
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2004/11