AK4950 Datasheet, PDF (52/106 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP & mini DSP

[AK4950]
4. Example of ALC Setting
Table 35 and Table 36 show the examples of the ALC setting for recording and playback path.
Register Name
LMTH1-0
WTM1-0
IREF7-0
IVL7-0,
IVR7-0
RGAIN2-0
RFST1-0
ALC
Comment
Limiter detection Level
Recovery waiting period
Maximum gain at recovery operation
fs=8kHz
Data
Operation
01
−4.1dBFS
01
32ms
E1H
+30dB
Gain of IVOL
E1H
+30dB
Recovery GAIN
011
0.0005dB
Fast Recovery GAIN
00
0.0032dB
ALC enable
1
Enable
Table 35. Example of the ALC Setting (Recording)
fs=48kHz
Data
Operation
01
−4.1dBFS
11
21.3ms
E1H
+30dB
E1H
+30dB
011
0.0005dB
00
0.0032dB
1
Enable
Register Name
LMTH1-0
WTM1-0
OREF7-0
OVL7-0,
OVR7-0
RGAIN2-0
RFST1-0
ALC
Comment
Limiter detection Level
Recovery waiting period
Maximum gain at recovery operation
fs=8kHz
Data
Operation
01
−4.1dBFS
01
32ms
A1H
+6dB
Gain of IVOL
91H
0dB
Recovery GAIN
011
0.0005dB
Fast Recovery GAIN
00
0.0032dB
ALC enable
1
Enable
Table 36. Example of the ALC Setting (Playback)
fs=48kHz
Data
Operation
01
−4.1dBFS
11
21.3ms
A1H
+6dB
91H
0dB
011
0.0005dB
00
0.0032dB
1
Enable
MS1320-E-00
- 52 -
2011/10