參數(shù)資料
型號(hào)： AK4566
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： 20bit Stereo CODEC with built-in IPGA & HP-AMP
中文描述： 20位立體聲編解碼器內(nèi)置單親遺傳算法
文件頁(yè)數(shù)： 30/45頁(yè)
文件大?。?/td> 454K
代理商： AK4566
ASAHI KASEI
AKM CONFIDENTIAL
[AK4566]
REV 0.5
2002/2
- 30 -
Addr Register Name
02H
Timer Select
D7
0
0
D6
0
0
D5
ZTM1
0
D4
ZTM0
0
D3
D2
D1
LTM1
0
D0
LTM0
0
WTM1
0
WTM0
0
Default
LTM1-0: ALC limiter operation period (Table 6)
When zero crossing is disabled (ZELMN = “1”), the IPGA value is changed immediately by ALC limiter
operation. When the IPGA value is changed continuously, the change is done by the period specified by
LTM1-0 bits. Default: “00”.
ALC Limiter Operation Period
8kHz
16kHz
63
μ
s
31
μ
s
125
μ
s
63
μ
s
250
μ
s
125
μ
s
500
μ
s
250
μ
s
Default
LTM1
LTM0
44.1kHz
11
μ
s
23
μ
s
45
μ
s
91
μ
s
0
0
1
1
0
1
0
1
0.5/fs
1/fs
2/fs
4/fs
Table 6. ALC Limiter Operation Period at zero crossing disable (ZELMN bit= “1”)
WTM1-0: ALC Recovery Waiting Period (Table 7)
WTM1-0 bits set a period of recovery operation when any limiter operation does not occur during ALC
operation. Default: “00”.
ALC Recovery Operation Waiting Period
8kHz
16kHz
16ms
8ms
32ms
16ms
64ms
32ms
128ms
64ms
Table 7. ALC Recovery Operation Waiting Period
Default
WTM1
WTM0
44.1kHz
2.9ms
5.8ms
11.6ms
23.2ms
0
0
1
1
0
1
0
1
128/fs
256/fs
512/fs
1024/fs
ZTM1-0: ALC Zero Crossing Timeout Period (Table 8)
When IPGA output detects zero crossing or timeout, the IPGA value is changed by
μ
P WRITE operation,
ALC recovery operation, or ALC limiter operation. Default: “00”.
Zero Crossing Timeout Period
8kHz
16kHz
16ms
8ms
32ms
16ms
64ms
32ms
128ms
64ms
Table 8. Zero Crossing Timeout Period
Default
ZTM1
ZTM0
44.1kHz
2.9ms
5.8ms
11.6ms
23.2ms
0
0
1
1
0
1
0
1
128/fs
256/fs
512/fs
1024/fs
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