ak4633 AKM Semiconductor, Inc., ak4633 Datasheet - Page 47

• Manufacturer Part Number: ak4633
• Description: 16-bit ?? Mono Codec With Alc & Mic/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
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.
4. Example of the ALC Operation for Recording Operation
Table 32 shows the examples of the ALC setting for mic recording.
MS0447-E-03
Register Name
LMTH
ZELM
ZTM1-0
WTM1-0
IREF7-0
IVOL7-0
LMAT1-0
RGAIN1-0
ALC
FRSL1-0
Comment
Limiter detection Level
Limiter zero crossing detection
Zero crossing timeout period
Recovery waiting period
*WTM1-0 bits should be the same data
Maximum gain at recovery operation
Gain of IVOL
Limiter ATT step
Recovery GAIN step
ALC enable
Speed of Fast Recovery
as ZTM1-0 bits
Table 32. Example of the ALC Setting (Recording)
Table 31. Value of VOL7-0 bits
VOL7-0bits
3AH
6DH
FDH
0EH
6EH
FEH
FFH
0FH
10H
6FH
:
:
:
- 47 -
Data
C5H
C5H
GAIN(0dB)
01
00
00
11
00
00
0
1
+35.625
-53.625
+35.25
+0.375
MUTE
-0.375
+19.5
+36.0
-54.0
0.0
:
:
:
fs=8kHz
1/2/4/8 step
−4.1dBFS
Operation
19.5dB
19.5dB
4 times
Enable
Enable
1 step
16ms
16ms
Data
C5H
C5H
01
01
01
11
00
10
0
1
fs=16kHz
1/2/4/8 step
Operation
−4.1dBFS
19.5dB
19.5dB
Enable
Enable
4times
1 step
16ms
16ms
[AK4633]
2006/04