AK4642VN Datasheet, PDF (39/82 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Stereo CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4642]
„ ೖྗσΟδλϧϘϦϡʔϜ (ϚχϡΞϧϞʔυ࣌)
ALC bit = “0”ͷͱ͖ɺೖྗσΟδλϧϘϦϡʔϜ͸ϚχϡΞϧϞʔυʹͳΓ·͢ɻ͜ͷϞʔυ͸ҎԼͷ৔߹
ʹ࢖༻͠·͢ɻ
1. ϦηοτղআޙɺALCಈ࡞ʹؔ͢ΔϨδελઃఆ(ZTM1-0, LMTHͳͲ)Λߦ͏৔߹ɻ
2. αϯϓϦϯάप೾਺ͷมߋʹ൐͍ɺϦϛολʗϦΧόϦपͲͳظALCಈ࡞ʹؔ͢ΔϨδελมߋΛ
ߦ͏৔߹ɻ
3. ೖྗσΟδλϧϘϦϡʔϜΛϚχϡΞϧϘϦϡʔϜͱͯ͠࢖༻͢Δ৔߹ɻ
ೖྗσΟδλϧϘϦϡʔϜͷήΠϯྔ͸IVL7-0, IVR7-0 bitͰઃఆ͠·͢(Table 28)ɻϘϦϡʔϜมߋ࣌ɺL/R
ಠཱʹθϩΫϩεݕग़ಈ࡞Λߦ͍·͢ɻθϩΫϩελΠϜΞ΢τ࣌ؒ͸ZTM1-0 bitͰઃఆ͢Δ͜ͱ͕Ͱ͖·
͢ɻ
PMADL = PMADR bits = “0”ͷͱ͖ʹIVL7-0, IVR7-0 bitsʹॻ͖ࠐΈΛߦ͏ͱɺPMADL bit = “1” or PMADR bit
= “1”͔ͯ͑׵͖ॻʹΒADCͷॳظԽαΠΫϧʹޙɺͦͷઃఆ஋ͰIVOL͕ಈ࡞Λ։࢝͠·͢ɻ
࿥Ի͔Β࠶ੜʹ੾Γସ͑ͨ৔߹ɺ࿥Ի࣌ͷઃఆ͕อ࣋͞Ε͍ͯΔͷͰɺIVL7-0 = IVR7-0 bits = “91H” (0dB)
ʹઃఆͯ͠Լ͍͞ɻ
IVL7-0
IVR7-0
GAIN (dB)
Step
F1H
+36.0
F0H
+35.625
EFH
+35.25
:
:
E2H
+30.375
E1H
+30.0
0.375dB Default
E0H
+29.625
:
:
03H
−53.25
02H
−53.625
01H
−54
00H
MUTE
Table 28. ೖྗσΟδλϧϘϦϡʔϜͷઃఆ஋
MS0358-J-02
- 39 -
2005/04