ak4538 AKM Semiconductor, Inc., ak4538 Datasheet - Page 52

• Manufacturer Part Number: ak4538
• Description: 16bit ?? Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
MS0198-E-01
Addr
08H
LTM1-0: ALC1 limiter operation period at zero crossing disable (ZELM bit = “1”) (see Table 27)
WTM1-0: ALC1 Recovery Waiting Period (see Table 28)
ZTM1-0: Zero crossing timeout for the write operation by the P, ALC1 recovery, and zero crossing enable (ZELM bit
ROTM: Period time for ALC2 Recovery operation
The IPGA value is changed immediately. When the IPGA value is changed continuously, the change is done by the
period specified by the LTM1-0 bits. Default is “00” (0.5/fs).
A period of recovery operation when any limiter operation does not occur during the ALC1 operation.
Default is “00” (128/fs).
When the IPGA of each L/R channels perform zero crossing or timeout independently, the IPGA value is changed
by the P WRITE operation, ALC1 recovery operation or ALC1 limiter operation (ZELM bit = “0”).
Default is “00” (128/fs).
0: 2048/fs (Default)
1: 512/fs
Register Name
Timer Select
LTM1
ZTM1
ZTM1
= “0”) of the ALC1 operation. (see Table 29)
Default
R/W
0
0
1
1
0
0
1
1
0
0
1
1
Table 27. ALC1 Limiter Operation Period at zero crossing disable (ZELM bit = “1”)
LTM0
ZTM0
ZTM0
0
1
0
1
0
1
0
1
0
1
0
1
Table 28. ALC1 Recovery Operation Waiting Period
1024/fs
1024/fs
RD
128/fs
256/fs
512/fs
128/fs
256/fs
512/fs
D7
0.5/fs
0
0
Table 29. Zero Crossing Timeout Period
1/fs
2/fs
4/fs
ALC1 Recovery Operation Waiting Period
ROTM
R/W
D6
0
128ms
128ms
125 s
250 s
500 s
8kHz
8kHz
8kHz
16ms
32ms
64ms
16ms
32ms
64ms
63 s
ALC1 Limiter Operation Period
- 52 -
Zero Crossing Timeout Period
ZTM1
R/W
D5
0
16kHz
16kHz
16kHz
125 s
250 s
ZTM0
16ms
32ms
64ms
16ms
32ms
64ms
31 s
63 s
R/W
8ms
8ms
D4
0
WTM1
R/W
D3
0
44.1kHz
44.1kHz
44.1kHz
11.6ms
23.2ms
11.6ms
23.2ms
2.9ms
5.8ms
2.9ms
5.8ms
11 s
23 s
45 s
91 s
WTM0
R/W
D2
0
Default
Default
Default
LTM1
R/W
D1
0
[AK4538]
LTM0
R/W
2003/5
D0
0