AK4646EZ Datasheet, PDF (41/78 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/SPK-AMP

[AK4646EZ]
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)
F1H
+36.0
F0H
+35.625
EFH
+35.25
:
:
C5H
+19.5
:
:
92H
+0.375
91H
0.0
90H
-0.375
:
:
2H
-53.625
1H
-54.0
0H
MUTE
Table 31. 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.
Register Name
LMTH1-0
ZELMN
ZTM1-0
WTM2-0
IREF7-0
IVL7-0,
IVR7-0
LMAT1-0
LFST
RGAIN1-0
RFST1-0
ALC1
Comment
fs=8kHz
Data
Operation
Limiter detection Level
01
−4.1dBFS
Limiter zero crossing detection
0
Enable
Zero crossing timeout period
01
32ms
Recovery waiting period
*WTM2-0 bits should be the same data 001
32ms
as ZTM1-0 bits
Maximum gain at recovery operation E1H
+30dB
Gain of IVOL
E1H
+30dB
Limiter ATT step
00
1 step
Fast Limiter Operation
1
ON
Recovery GAIN step
00
1 step
Fast Recovery Speed
00
4 times
ALC enable
1
Enable
Table 32. Example of the ALC setting (Recording)
fs=44.1kHz
Data
Operation
01
−4.1dBFS
0
Enable
11
23.2ms
100
46.4ms
E1H
+30dB
E1H
+30dB
00
1 step
1
ON
00
1 step
00
4 times
1
Enable
MS0630-E-00
- 41 -
2007/06