AK4633EN Datasheet, PDF (47/83 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

[AK4633]
3. The Volume at the ALC Operation
The current volume value at the ALC operation is reflected by VOL7-0 bits. It is enable to check the current volume value
with reading the register value of VOL7-0 bits.
VOL7-0bits
GAIN(0dB)
0EH
+36.0
0FH
+35.625
10H
+35.25
:
:
3AH
+19.5
:
:
6DH
+0.375
6EH
0.0
6FH
-0.375
:
:
FDH
-53.625
FEH
-54.0
FFH
MUTE
Table 31. Value of VOL7-0 bits
4. Example of the ALC Operation for Recording Operation
Table 32 shows the examples of the ALC setting for a microphone recording.
Register Name
LMTH
ZELM
ZTM1-0
WTM1-0
IREF7-0
IVOL7-0
LMAT1-0
RGAIN1-0
ALC
FRSL1-0
Comment
fs=8kHz
Data
Operation
Limiter detection Level
01
4.1dBFS
Limiter zero crossing detection
0
Enable
Zero crossing timeout period
00
16ms
Recovery waiting period
*WTM1-0 bits should be the same data 00
16ms
as ZTM1-0 bits
Maximum gain at recovery operation C5H
19.5dB
Gain of IVOL
C5H
19.5dB
Limiter ATT step
11
1/2/4/8 step
Recovery GAIN step
00
1 step
ALC enable
1
Enable
Speed of Fast Recovery
00
4 times
Table 32. Example of the ALC Setting (Recording)
fs=16kHz
Data
Operation
01
4.1dBFS
0
Enable
01
16ms
01
16ms
C5H
19.5dB
C5H
19.5dB
11
1/2/4/8 step
00
1 step
1
Enable
10
4times
MS0447-E-06
- 47 -
2015/10