ak4141 AKM Semiconductor, Inc., ak4141 Datasheet - Page 28

• Manufacturer Part Number: ak4141
• Description: Nicam/a2/eia-j Digital Stereo Decoder
• Manufacturer: AKM Semiconductor, Inc.

3. Example of ALC Operation
Table 18
The following registers should not be changed during the ALC operation.
MS0952-E-00
• LMTH1-0, LMAT1-0, WTM2-0, ZTM1-0, RGAIN1-0, REF7-0, ZELMN, RFST1-0
shows the example of the ALC setting.
Register Name
RGAIN1-0
LMTH1-0
LMAT1-0
WTM2-0
RFST1-0
IREF5-0
ZELMN
ZTM1-0
Table 16. Reference Level at ALC Recovery operation for ALC1/2
RFST1 bit
IREF17-10bits
IREF27-10bits
Table 17. Fast Recovery Speed Setting (N/A: Not available)
0
0
1
1
EFH
F1H
F0H
E1H
92H
91H
90H
2H
1H
0H
*WTM2-0 bits should be the same data
:
:
:
Maximum gain at recovery operation
Limiter zero crossing detection
Zero crossing timeout period
Table 18. Example of the ALC Setting
Recovery waiting period
Limiter detection Level
Recovery GAIN step
Fast Recovery Speed
Limiter ATT step
as ZTM1-0 bits
+30.0(default)
RFST0 bit
GAIN(0dB)
Comment
+35.625
-53.625
+35.25
+0.375
MUTE
-0.375
+36.0
-54.0
0
1
0
1
0.0
:
:
:
- 28 -
Recovery Speed
0.375dB
Step
x 16
N/A
x 4
x 8
Data
28H
100
01
11
00
00
00
0
fs=44.1kHz
(default)
Operation
−4.1dBFS
23.2ms
46.4ms
4 times
Enable
1 step
1 step
+6dB
[AK4141]
2008/05