AK4753 Datasheet, PDF (46/85 Pages) Asahi Kasei Microsystems – 2-in, 4-out CODEC with DSP Functions

[AK4753]
REF7-0 bits
GAIN(dB)
Step (dB)
F1H
0
(default)
F0H
-0.375
EFH
-0.75
:
:
A0H
-30.375
9FH
-30.75
9EH
-31.125
:
:
0.375
50H
-60.375
4FH
-60.75
4EH
-61.125
:
:
02H
-89.625
01H
-90.0
00H
MUTE
Table 36. Reference Level at Recovery Operation
RFST1 bit
RFST0 bit
Recovery Speed
0
0
4 times
(default)
0
1
8 times
1
0
16times
1
1
N/A
Table 37. Fast Recovery Speed Setting (N/A: not available)
3. Example of the Limiter Operation Setup
An example of the limiter setting is shown in Table 38.
Register Name Comment
fs=8kHz
Data
Operation
LMTH1-0
Limiter detection Level
01
−4.1dBFS
ZELMN
Limiter zero crossing detection
0
Enable
ZTM1-0
Zero crossing timeout period
01
32ms
Recovery waiting period
WTM2-0
*WTM2-0 bits should be the same or 001
32ms
longer data as ZTM1-0 bits.
REF7-0
Reference level at recovery operation F1H
0dB
LMAT1-0
Limiter ATT step
00
1 step
RGAIN1-0
Recovery GAIN step
00
1 step
RFST1-0
Fast Recovery Speed
00
4 times
Table 38. Example of the Limiter Operation Setting
fs=44.1kHz
Data
Operation
01
−4.1dBFS
0
Enable
11
23.2ms
011
23.2ms
F1H
0dB
00
1 step
00
1 step
00
4 times
MS1311-E-00
- 46 -
2011/07