AK4637 Datasheet, PDF (54/96 Pages) Asahi Kasei Microsystems – 24bit Mono CODEC with MIC - SPK-AMP

[AK4637]
4. Example of ALC Setting
Table 37 and Table 38 show the examples of the ALC setting for recording and playback path.
Register
Name
LMTH2-0
FRN
WTM1-0
REF7-0
IVL7-0,
IVR7-0
RGAIN2-0
RFST1-0
EQFC1-0
ALCEQN
ALC
Comment
Limiter detection Level
Fast Recovery mode
Recovery waiting period
Maximum gain at recovery operation
fs=8kHz
Data Operation
010 4.1dBFS
0
Enable
01
32ms
E1H
+30dB
Data
010
0
11
E1H
fs=48kHz
Operation
4.1dBFS
Enable
21.3ms
+30dB
Gain of IVOL
E1H
+30dB
E1H
+30dB
Recovery GAIN
000 0.00424dB 011
Fast Recovery GAIN
11
0.0127dB
00
ALC EQ Frequency
00
fc1=100Hz,
fc2=67Hz
10
ALC EQ disable
0
Enable
0
ALC enable
1
Enable
1
Table 37. Example of the ALC Setting (Recording)
0.00106dB
(2/fs)
0.0032dB
fc1=150Hz,
fc2=100Hz
Enable
Enable
Register
Name
LMTH2-0
FRN
WTM1-0
REF5-0
IVL7-0,
IVR7-0
RGAIN2-0
RFST1-0
EQFC1-0
ALCEQN
ALC
Comment
Limiter detection Level
Fast Recovery mode
Recovery waiting period
Maximum gain at recovery operation
fs=8kHz
Data Operation
010 4.1dBFS
0
Enable
01
32ms
28H
+6dB
Data
010
0
11
28H
fs=48kHz
Operation
4.1dBFS
Enable
21.3ms
+6dB
Gain of IVOL
91H
0dB
91H
0dB
Recovery GAIN
000 0.00424dB 011
Fast Recovery GAIN
11
0.0127dB
00
ALC EQ Frequency
00
fc1=100Hz,
fc2=67Hz
10
ALC EQ disable
0
Enable
0
ALC enable
1
Enable
1
Table 38. Example of the ALC Setting (Playback)
0.00106dB
(2/fs)
0.0032dB
fc1=150Hz,
fc2=100Hz
Enable
Enable
015010680-E-00
- 54 -
2015/09