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AK4645AEZ Datasheet, PDF (41/85 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP
[AK4645A]
IVL7-0, IVR7-0 bitsͷॻ͖ࠐΈΛଓ͚ͯߦ͏৔߹͸ɺθϩΫϩελΠϜΞ΢τ࣌ؒҎ্ͷִؒΛ͚͋ͯߦͬͯ
Լ͍͞ɻॴఆͷִؒΛ͚͋ͳ͍Ͱॻ͖ࠐΈΛߦ͏ͱɺθϩΫϩεΧ΢ϯλ͕ຖճϦηοτ͞ΕϘϦϡʔϜ͕
੾ΓସΘΓ·ͤΜɻͨͩ͠ɺॻ͖ࠐΉϨδελ஋͕લճͱಉ͡஋ͷ৔߹͸θϩΫϩεΧ΢ϯλ͸Ϧηοτ͞
Εͳ͍ͷͰɺθϩΫϩελΠϜΞ΢τ࣌ؒΑΓ୹ִ͍ؒͰॻ͖ࠐΈΛߦ͏͜ͱ͕Ͱ͖·͢ɻ
ALC bit
ALC Status
Disable
Enable
Disable
IVL7-0 bits
E1H(+30dB)
IVR7-0 bits
C6H(+20dB)
Internal IVL
Internal IVR
E1H(+30dB)
C6H(+20dB)
E1(+30dB) --> F1(+36dB)
(1)
E1(+30dB) --> F1(+36dB)
E1(+30dB)
(2)
C6H(+20dB)
Figure 30. ALCಈ࡞தͷIVOLಈ࡞ྫ
(1) ALC։࢝࣌ʹIVLͱIVRͷ஋͕ҟͳ͍ͬͯΔ৔߹͸ɺIVLͷ஋͕ελʔτ஋ʹͳΓ·͢ɻALC bit = “1”Λ
ॻ͖ࠐΜͰ͔ΒIVL7-0 bitsͷ஋ͰALCಈ࡞Λ։࢝͢Δ·Ͱͷ଴ͪ࣌ؒ͸࠷େͰϦΧόϦ଴ؒ࣌ػ
(WTM2-0 bits) + θϩΫϩελΠϜΞ΢τ࣌ؒ(ZTM1-0 bits)Ͱ͢ɻ
(2) ALCಈ࡞த͸ɺIVL, IVRͷϨδελ(09H, 0CH)ʹॻ͖ࠐΈΛߦͬͯ΋൓ө͞Ε·ͤΜɻALC͕Disable͞
ΕͨޙɺθϩΫϩε·ͨ͸θϩΫϩελΠϜΞ΢τ࣌ʹͦͷ஋͕൓ө͞Ε·͢ɻ࠶౓ALCΛEnable͢Δ
৔߹͸ɺALC bit = “0”ͷޙɺθϩΫϩελΠϜΞ΢τ࣌ؒҎ্ͷִؒΛۭ͚ͯALC bit = “1”Λઃఆͯ͠Լ
͍͞ɻ
MS0986-J-00
- 41 -
2008/07