AK4951AEN Datasheet, PDF (54/105 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/HP/SPK-AMP

[AK4951A]
4. Example of ALC Setting
Table 43 and Table 44 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
Table 43. Example of the ALC Setting (Recording)
Comment
fs=8kHz
Data Operation
Data
Limiter detection Level
010 4.1dBFS 010
Fast Recovery mode
0
Enable
0
Recovery waiting period
01
32ms
11
Maximum gain at recovery operation E1H
+30dB
E1H
fs=48kHz
Operation
4.1dBFS
Enable
21.3ms
+30dB
Gain of IVOL
E1H
+30dB
E1H
+30dB
Recovery GAIN
Fast Recovery GAIN
ALC EQ Frequency
ALC EQ disable
ALC enable
000 0.00424dB 011 0.00106dB (2/fs)
11
0.0127dB
00
0.0032dB
00
fc1=100Hz,
fc2=67Hz
10
fc1=150Hz,
fc2=100Hz
0
Enable
0
Enable
1
Enable
1
Enable
Register
Name
LMTH2-0
FRN
WTM1-0
REF5-0
IVL7-0,
IVR7-0
RGAIN2-0
RFST1-0
EQFC1-0
ALCEQN
ALC
Table 44. Example of the ALC Setting (Playback)
Comment
fs=8kHz
Data Operation
Data
Limiter detection Level
010 4.1dBFS 010
Fast Recovery mode
0
Enable
0
Recovery waiting period
01
32ms
11
Maximum gain at recovery operation 28H
+6dB
28H
Gain of IVOL
91H
0dB
91H
Recovery GAIN
Fast Recovery GAIN
ALC EQ Frequency
ALC EQ disable
ALC enable
000 0.00424dB 011
11
0.0127dB
00
00
fc1=100Hz,
fc2=67Hz
10
0
Enable
0
1
Enable
1
fs=48kHz
Operation
4.1dBFS
Enable
21.3ms
+6dB
0dB
0.00106dB (2/fs)
0.0032dB
fc1=150Hz,
fc2=100Hz
Enable
Enable
016001936-E-00
- 54 -
2016/03