AK4631 Datasheet, PDF (52/69 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4631]


ALC1: ALC1Πωʔϒϧϑϥά
0: ALC1 Disable (Default)
1: ALC1 Enable
“1”ͰALC1ΛΠωʔϒϧ͠·͢ɻॳظ஋͸“0”(Disable)Ͱ͢ɻ
ALC2: ALC2Πωʔϒϧϑϥά
0: ALC2 Disable
1: ALC2 Enable (Default)
ظॳԽαΠΫϧ(512/fs=64ms@fs=8kHz, ROTM bit = “0”)ऴྃޙɺALC2͸ΠωʔϒϧʹͳΓ·͢ɻ
͜ͷॳظԽαΠΫϧ͸ɺPDN pinΛ“L”͔Β“H”·ͨ͸PMSPK bitΛ“0”͔Β“1”ʹมߋͨ࣌͠ɺ։࢝
͞Ε·͢ɻॳظ஋͸“1”(Enable)Ͱ͢ɻ




Addr Register Name
D7
D6
D5
D4
D3
D2
D1
D0
08H ALC Mode Control 2
0
REF6 REF5 REF4 REF3 REF2 REF1 REF0
Default
0
0
1
1
0
1
1
0


REF6-0: ALC1ϦΧόϦಈ࡞࣌ͷج४஋ͷઃఆ(see Table 38)
ALC1ϦΧόϦಈ࡞தɺIPGA஋͕REF6-0 bitͰઃఆ͞Εͨج४஋ʹୡͨ͠৔߹ɺج४஋Ҏ্ͷήΠ
ϯಈ࡞͸ߦ͍·ͤΜɻ
ྫ͑͹ɺREF=30H, RATT=2 step, IPGA=2FHͷ࣌ɺΦʔτϦΧόϦಈ࡞ʹΑΓɺIPGA͸2FH + 2step
= 31HʹͳΖ͏ͱ͠·͕͢ɺREF=30HͰ͢ͷͰɺIPGA஋͸30HʹͳΓ·͢ɻॳظ஋͸“36H”Ͱ͢ɻ
DATA (HEX) GAIN (dB)
STEP
47
+27.5
46
+27.0
45
+26.5
:
:
36
+19.0
Default
:
:
10
+0.0
:
:
0.5dB
06
−5.0
05
−5.5
04
−6.0
03
−6.5
02
−7.0
01
−7.5
00
−8.0
Table 38. Setting Reference Value at ALC1 Recovery Operation




MS0317-J-01
- 52 -
2004/11