AK4640_05 AKM [Asahi Kasei Microsystems], AK4640_05 Datasheet - Page 56

• Manufacturer Part Number: AK4640_05
• Description: 16-Bit ?? CODEC with MIC/HP/SPK-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

ASAHI KASEI
MS0273-E-02
Addr
08H
LTM1-0: ALC1 limiter operation period at zero crossing disable (see Table 25)
WTM1-0: ALC1 Recovery Waiting Period (see Table 26)
ZTM1-0: Zero crossing timeout for the write operation by the µP, ALC1 recovery, and zero crossing enable (ZELM
ROTM:
0: 2048/fs (Default)
1: 512/fs
Register Name
Timer Select
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 performs zero crossing or timeout, the IPGA value is changed by the µP WRITE operation,
ALC1 recovery operation or ALC1 limiter operation (ZELM bit = “0”).
Default is “00” (128/fs).
WTM1
LTM1
ZTM1
Default
bit = “0”) of the ALC1 operation (see Table 27)
Period time for ALC2 Recovery operation
R/W
0
0
1
1
0
0
1
1
0
0
1
1
Table 25. ALC1 Limiter Operation Period at zero crossing disable (ZELM bit = “1”)
WTM0
LTM0
ZTM0
0
1
0
1
0
1
0
1
0
1
0
1
Table 26. 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
Table 27. Zero Crossing Timeout Period
0
0
1/fs
2/fs
4/fs
ALC1 Recovery Operation Waiting Period
ROTM
R/W
ALC1 Limiter Operation Period
D6
Zero Crossing Timeout Period
0
128ms
128ms
125µs
250µs
500µs
8kHz
8kHz
16ms
32ms
64ms
8kHz
16ms
32ms
64ms
63µs
- 56 -
ZTM1
R/W
D5
0
16kHz
16kHz
16kHz
ZTM0
125µs
250µs
16ms
32ms
64ms
16ms
32ms
64ms
31µs
63µs
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
11µs
23µs
45µs
91µs
WTM0
R/W
D2
0
Default
Default
Default
LTM1
R/W
D1
0
[AK4640]
2005/04
LTM0
R/W
D0
0