AK4564 Datasheet, PDF (41/48 Pages) Asahi Kasei Microsystems – 16BIT CODEC WITH BUILT-IN ALC AND MIC/HP/SPK-AMP

ASAHI KASEI
[AK4564]
ALC Mode Control 2
Addr
Register Name
08H ALC Mode Control 2
Default
D7
D6
D5
D4
D3
0
FSTM
0
0
0
0
0
0
0
0
LMTH1-0: ALC1 Limiter Detection Level / Recovery Counter Reset Level
D2
D1
D0
FR LMTH1 LMTH0
1
1
0
LMTH1 LMTH0 ALC1 Limier Detection Level ALC1 Recovery Waiting Counter Reset Level
0
0
ALC1 Output ≥ -2.5dBFS
-2.5dBFS > ALC1 Output ≥ -4.1dBFS
0
1
ALC1 Output ≥ -4.1dBFS
-4.1dBFS > ALC1 Output ≥ -6.0dBFS
1
0
ALC1 Output ≥ -6.0dBFS
-6.0dBFS > ALC1 Output ≥ -8.5dBFS ^Default
1
1
ALC1 Output ≥ -8.5dBFS
-8.5dBFS > ALC1 Output ≥ -12dBFS
Table 21. ALC1 Limiter Detection Level / Recovery Counter Reset Level
FR: Enable ALC1 Fast Recovery Operation
0: Disable
1: Enable (Default)
If the impulse noise is supplied, the ALC1 recovery operation becomes the faster period than a set of
ZTM1-0 and WTM1-0 bits.
FSTM: This data determines the time of ALC1 recovery period (WTM1-0 bit), IVOL zero crossing timeout period
(ZTM1-0 bit), OATT zero crossing timeout period (TM1-0 bit) and FADEIN/OUT period (FDTM1-0 bit)
0: fs = 48kHz (Default)
1: fs = 32kHz
MS0140-E-01
- 41 -
2002/07