AK4631 Datasheet, PDF (53/69 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4631]
Addr Register Name
D7
D6
D5
D4
D3
D2
D1
D0
09H Input PGA Control
0
IPGA6 IPGA5 IPGA4 IPGA3 IPGA2 IPGA1 IPGA0
Default


0
0
0
1
0
0
0
0
IPGA6-0: ೖྗΞφϩάPGA (see Table 39)
ظॳ஋͸“10H”Ͱ͢ɻIPGAͷήΠϯΛ੾Γସ͑Δ৔߹͸ɺPMMIC bit = “1”͔ͭ ALC1 bit = “0”ͷঢ়
ଶͰॻ͖ࠐΜͰԼ͍͞ɻ·ͨɺPMMIC bit = “1” ޙɺ2/fs (250µs@fs=8kHz)ͷ࣌ؒΛ଴ͬͯ IPGA ΁
ॻ͖ࠐΈΛߦ͍ͬͯͩ͘͞ɻ IPGAͷήΠϯ͸ɺPMMIC bit = “0”ͷͱ͖Ϧηοτ͞ΕɺॳظԽ͞Ε·
͢ɻALC1 bit “1” Æ “0”ͱͨ࣌͠ɺIPGAͷήΠϯ͸ALC1ಈ࡞ʹΑΓࣗಈઃఆ͞Εͨ࠷ऴ஋Λอ࣋
͠·͢ɻ


Addr
0AH
ϚχϡΞϧϞʔυͷ৔߹ɺIPGA͸೚ҙͷ஋ʹઃఆ͢Δ͜ͱ͕Ͱ͖·͢ɻIPGA஋Λมߋͨ͠৔߹ͷ
θϩΫϩελΠϜΞ΢τ࣌ؒ͸ZTM1-0 bitͰઃఆ͢Δ͜ͱ͕Ͱ͖·͢ɻIPGAͷίϯτϩʔϧϨδ
ελʹॻ͖ࠐΈΛߦ͏ͱɺθϩΫϩεΧ΢ϯλ͸Ϧηοτ͞ΕɺΧ΢ϯτ͕։࢝͞Ε·͢ɻೖྗ
৴߸͕θϩΫϩε͢Δ͔ɺ·ͨ͸θϩΫϩελΠϜΞ΢τͨ࣌͠ʹॳΊͯॻ͖ࠐ·Εͨ஋͕༗ޮ
ʹͳΓ·͢ɻ
DATA (HEX) GAIN (dB)
STEP
47
+27.5
46
+27.0
45
+26.5
:
:
36
+19.0
:
:
10
+0.0
Default
:
:
0.5dB
06
−5.0
05
−5.5
04
−6.0
03
−6.5
02
−7.0
01
−7.5
00
−8.0
Table 39. Input Gain Setting
Register Name
Digital Volume Control
Default
D7
DVOL7
0
D6
DVOL6
0
D5
DVOL5
0
D4
DVOL4
1
D3
DVOL3
1
D2
DVOL2
0
D1
DVOL1
0
D0
DVOL0
0
DVOL7-0: ग़ྗσΟδλϧϘϦϡʔϜ(see Table 40)
AK4631͸MUTEΛؚΉ0.5dBεςοϓɺ256ϨϕϧͷσΟδλϧग़ྗϘϦϡʔϜ(DVOL)Λ಺ଂ͠·
͢ɻ͜ͷϘϦϡʔϜ͸DACͷલஈʹ͋ΓɺೖྗσʔλΛ+12dB͔Β−115dBݮͰ·ਰɺ·ͨ͸ϛϡ
ʔτ͠·͢ɻϘϦϡʔϜؒͷભҠ͸1061/fs (= 133ms @ fs = 8kHz) ·ͨ͸256/fs (= 32ms @ fs = 8kHz)
ͰιϑτભҠʹߦΘΕ·͢ɻιϑτભҠ࣌ؒ͸ DVTM bit Ͱઃఆ͠·͢ɻ
DVOL7-0
Gain
00H
+12.0dB
01H
+11.5dB
02H
+11.0dB
•
•
18H
0dB
•
•
FDH
−114.5dB
FEH
−115.0dB
FFH
MUTE (−∞)
Table 40. Digital Volume Code Table
Default
MS0317-J-01
- 53 -
2004/11