參數(shù)資料
型號(hào)： AK4641
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： 16 BIT CODEC WITH BLUETOOTH INTERFACE
中文描述： 16位編解碼器與藍(lán)牙接口
文件頁(yè)數(shù)： 37/51頁(yè)
文件大?。?/td> 461K
代理商： AK4641
ASAHI KASEI
[AK4641]
MS0301-E-00
2004/05
- 42 -
AUXAD: Switch Control from AUX In to ADC of Stereo CODEC
0: OFF (default)
1: ON
Addr
Register Name
D7
D6
D5
D4
D3
D2
D1
D0
08H
Timer Select
0
ZTM1
ZTM0
WTM1
WTM0
LTM1
LTM0
R/W
RD
R/W
Default
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.
ALC1 Limiter Operation Period
LTM1
LTM0
8kHz
16kHz
44.1kHz
0
0.5/fs
63
s
31
s
11
s
Default
0
1
1/fs
125
s
63
s
23
s
1
0
2/fs
250
s
125
s
45
s
1
4/fs
500
s
250
s
91
s
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.
ALC1 Recovery Operation Waiting Period
WTM1
WTM0
8kHz
16kHz
44.1kHz
0
128/fs
16ms
8ms
2.9ms
Default
0
1
256/fs
32ms
16ms
5.8ms
1
0
512/fs
64ms
32ms
11.6ms
1
1024/fs
128ms
64ms
23.2ms
Table 18. ALC1 Recovery Operation Waiting Period
ZTM1-0: Zero crossing timeout at the write operation by
P, 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
P WRITE operation or ALC1 recovery operation or ALC1 limiter operation (ZELM bit = “0”).
Zero Crossing Timeout Period
ZTM1
ZTM0
8kHz
16kHz
44.1kHz
0
128/fs
16ms
8ms
2.9ms
Default
0
1
256/fs
32ms
16ms
5.8ms
1
0
512/fs
64ms
32ms
11.6ms
1
1024/fs
128ms
64ms
23.2ms
Table 19. Zero Crossing Timeout Period
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