ASAHI KASEI
[AK4537]
MS0202-E-04
2005/04
-
55
-
ALC1: ALC1 Enable Flag
0:
ALC1
Disable
(Default)
1: ALC1 Enable
ALC1 is enabled when ALC1 bit is “1”. Default is “0”(Disable).
ALC2: ALC2 Enable Flag
0:
ALC2
Disable
1:
ALC2
Enable
(Default)
ALC2 is enabled after initialization cycle(2048/fs=46.4ms@fs=44.1kHz). This initialization cycle starts when
PMSPK bit is changed from “0” to “1”. Default is “1”(Enable).
Addr
Register
Name
D7 D6 D5 D4 D3 D2 D1 D0
0AH
ALC Mode Control 2
0
REF6
REF5 REF4 REF3 REF2 REF1 REF0
R/W
RD R/W R/W R/W R/W R/W R/W R/W
Default
0 0 1 1 0 1 1 0
REF6-0: Reference value at ALC1 Recovery Operation (see Table 31)
During the ALC1 recovery operation, if the IPGA value exceeds the setting reference value by gain operation,
then the IPGA does not become larger than the reference value. For example, when REF7-0 = “30H”, RATT
= 2step, IPGA = 2FH, even if the input signal does not exceed the “ALC1 Recovery Waiting Counter Reset
Level”, the IPGA does not change to 2FH + 2step = 31H, and keeps 30H. Default is “36H”.
GAIN (dB)
DATA (HEX)
MIC Input
LINE Input
STEP
47 +27.5
+12.0
46 +27.0
+11.5
45 +26.5
+11.0
: : :
36 +19.0 +3.5
Default
: : :
2F +15.5 +0.0
: : :
10 +0.0
-15.5
: : :
06
5.0
20.5
05
5.5
21.0
04
6.0
21.5
03
6.5
22.0
02
7.0
22.5
01
7.5
23.0
00
8.0
23.5
0.5dB
Table 31. Setting Reference Value at ALC1 Recovery Operation
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