ak4537 AKM Semiconductor, Inc., ak4537 Datasheet - Page 55

• Manufacturer Part Number: ak4537
• Description: 16-bit 6 Stereo Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
MS0202-E-04
Addr
0AH
ALC1: ALC1 Enable Flag
ALC2: ALC2 Enable Flag
REF6-0:
0: ALC1 Disable (Default)
1: ALC1 Enable
0: ALC2 Disable
1: ALC2 Enable (Default)
Register Name
ALC Mode Control 2
ALC1 is enabled when ALC1 bit is “1”. Default is “0”(Disable).
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).
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”.
Default
Reference value at ALC1 Recovery Operation (see Table 31)
R/W
DATA (HEX)
47
46
45
36
2F
10
06
05
04
03
02
01
00
:
:
:
:
Table 31. Setting Reference Value at ALC1 Recovery Operation
RD
D7
0
0
MIC Input
+27.5
+27.0
+26.5
+19.0
+15.5
+0.0
5.0
5.5
6.0
6.5
7.0
7.5
8.0
:
:
:
:
REF6
R/W
GAIN (dB)
D6
0
- 55 -
LINE Input
REF5
R/W
D5
1
+12.0
+11.5
+11.0
-15.5
+3.5
+0.0
20.5
21.0
21.5
22.0
22.5
23.0
23.5
:
:
:
:
REF4
R/W
D4
1
STEP
0.5dB
REF3
R/W
D3
0
REF2
Default
R/W
D2
1
REF1
R/W
D1
1
[AK4537]
2005/04
REF0
R/W
D0
0