AK4641 Datasheet, PDF (42/51 Pages) Asahi Kasei Microsystems – 16 BIT CODEC WITH BLUETOOTH INTERFACE

ASAHI KASEI
[AK4641]
AUXAD: Switch Control from AUX In to ADC of Stereo CODEC
0: OFF (default)
1: ON
Addr
08H
Register Name
Timer Select
R/W
Default
D7
D6
D5
D4
D3
D2
D1
D0
0
0
ZTM1 ZTM0 WTM1 WTM0 LTM1 LTM0
RD
RD
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
LTM1-0: ALC1 limiter operation period at zero crossing disable (ZELM bit = “1”)
The IPGA value is changed immediately. When the IPGA value is changed continuously, the change is done by
the period specified by LTM1-0 bits.
LTM1 LTM0
ALC1 Limiter Operation Period
8kHz
16kHz
44.1kHz
0
0
0.5/fs
63µs
31µs
11µs
Default
0
1
1/fs
125µs
63µs
23µs
1
0
2/fs
250µs
125µs
45µs
1
1
4/fs
500µs
250µs
91µs
Table 17. ALC1 Limiter Operation Period at zero crossing disable (ZELM bit = “1”)
WTM1-0: ALC1 Recovery Waiting Period
WTM1-0 bits set a period of recovery operation when any limiter operation does not occur during ALC1 operation.
When the output signal level exceeds auto recovery waiting counter reset level set by LMTH bit, the auto recovery
waiting counter is reset. The waiting timer starts when the output signal level becomes below the auto recovery
waiting counter reset level.
WTM1
0
0
1
1
WTM0
ALC1 Recovery Operation Waiting Period
8kHz
16kHz
44.1kHz
0
128/fs
16ms
8ms
2.9ms
1
256/fs
32ms
16ms
5.8ms
0
512/fs
64ms
32ms
11.6ms
1
1024/fs
128ms
64ms
23.2ms
Table 18. ALC1 Recovery Operation Waiting Period
Default
ZTM1-0: Zero crossing timeout at the write operation by µP, ALC1 recovery operation and zero crossing enable
(ZELM bit = “0”) of the ALC1 operation
When IPGA of each L/R channels perform zero crossing or timeout independently, the IPGA value is changed by
µP WRITE operation or ALC1 recovery operation or ALC1 limiter operation (ZELM bit = “0”).
ZTM1
0
0
1
1
ZTM0
0
1
0
1
Zero Crossing Timeout Period
8kHz
16kHz
128/fs
16ms
8ms
256/fs
32ms
16ms
512/fs
64ms
32ms
1024/fs
128ms
64ms
Table 19. Zero Crossing Timeout Period
44.1kHz
2.9ms
5.8ms
11.6ms
23.2ms
Default
MS0301-E-00
- 42 -
2004/05