AK4646EN AKM [Asahi Kasei Microsystems], AK4646EN Datasheet - Page 41

• Manufacturer Part Number: AK4646EN
• Description: Stereo CODEC with MIC/SPK-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

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 ALC Operation
Table 32 and Table 33 show the examples of the ALC setting for recording and playback path.
MS0557-E-02
Register Name
LMTH1-0
ZELMN
ZTM1-0
WTM2-0
IREF7-0
IVL7-0,
IVR7-0
LMAT1-0
LFST
RGAIN1-0
RFST1-0
ALC1
Comment
Limiter detection Level
Zero crossing timeout period
Recovery waiting period
*WTM2-0 bits should be the same data
Maximum gain at recovery operation
Gain of IVOL
Limiter ATT step
Fast Limiter Operation
Recovery GAIN step
Fast Recovery Speed
ALC enable
Limiter zero crossing detection
as ZTM1-0 bits
Table 32. Example of the ALC setting (Recording)
Table 31. Value of VOL7-0 bits
VOL7-0bits
EFH
C5H
F1H
F0H
92H
91H
90H
2H
1H
0H
:
:
:
- 41 -
Data
E1H
E1H
001
GAIN(0dB)
01
01
00
00
00
0
1
1
+35.625
-53.625
+35.25
+0.375
MUTE
-0.375
+36.0
+19.5
-54.0
0.0
:
:
:
fs=8kHz
− 4.1dBFS
Operation
4 times
Enable
Enable
+30dB
+30dB
1 step
1 step
32ms
32ms
ON
Data
E1H
E1H
100
01
00
00
11
00
0
1
1
fs=44.1kHz
Operation
− 4.1dBFS
23.2ms
46.4ms
4 times
Enable
+30dB
+30dB
Enable
1 step
1 step
ON
[AK4646]
2007/05