參數(shù)資料
型號： AK5702VN
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： 4-Channel ADC with PLL & MIC-AMP
中文描述： 4通道ADC，帶鎖相環(huán)
文件頁數(shù)： 42/76頁
文件大?。?/td> 933K
代理商： AK5702VN
[AK5702]
MS0623-E-00
2007/06
- 42 -
ZELMNA/B
LMATA/B1
0
0
1
1
x
LMATA/B0
0
1
0
1
x
Table 29. ALC Limiter ATT Step
Zero Crossing Timeout Period
8kHz
128/fs
16ms
256/fs
32ms
512/fs
64ms
1024/fs
128ms
Table 30. ALC Zero Crossing Timeout Period
ALC Limiter ATT Step
1 step
2 step
4 step
8 step
1step
(default)
0.375dB
0.750dB
1.500dB
3.000dB
0.375dB
0
1
(default)
ZTMA/B1
ZTMA/B0
16kHz
8ms
16ms
32ms
64ms
44.1kHz
2.9ms
5.8ms
11.6ms
23.2ms
0
0
1
1
0
1
0
1
2. ALC Recovery Operation
The ALC recovery operation waits for the WTMA/B2-0 bits (Table 31) to be set after completing the ALC limiter
operation. If the input signal does not exceed “ALC recovery waiting counter reset level” (Table 28) during the wait time,
the ALC recovery operation is done. The IVAL and IVAR values are automatically incremented by RGA/B1-0 bits
(Table 32) up to the set reference level (Table 33) with zero crossing detection which timeout period is set by ZTMA/B1-0
bits (Table 30). Then the IVA/BL and IVA/BR are set to the same value for both channels. The ALC recovery operation
is done at a period set by WTMA/B2-0 bits. If ZTMA/B1-0 is longer than WTMA/B2-0 and no zero crossing occurs, the
ALC recovery operation is done at a period set by ZTMA/B1-0 bits.
For example, when the current IVOL value is 30H and RGA/B1-0 bits are set to “01”, IVOL is changed to 32H by the
auto limiter operation and then the input signal level is gained by 0.75dB (=0.375dB x 2). When the IVOL value exceeds
the reference level (REFA/B7-0), the IVOL values are not increased.
When
“ALC recovery waiting counter reset level (LMTHA/B1-0)
≤
Output Signal < ALC limiter detection level
(LMTHA/B1-0)”
during the ALC recovery operation, the waiting timer of ALC recovery operation is reset. When
“ALC recovery waiting counter reset level (LMTHA/B1-0) > Output Signal”,
the waiting timer of ALC recovery operation starts.
The ALC operation corresponds to the impulse noise. When the impulse noise is input, the ALC recovery operation
becomes faster than a normal recovery operation. When large noise is input to microphone instantaneously, the quality of
small level in the large noise can be improved by this fast recovery operation. The speed of fast recovery operation is
setted by RFSTA/B1-0 bits (Table 34).
WTMA/B2 WTMA/B1
WTMA/B0
0
0
0
128/fs
0
0
1
256/fs
0
1
0
512/fs
0
1
1
1024/fs
1
0
0
2048/fs
1
0
1
4096/fs
1
1
0
8192/fs
1
1
1
16384/fs
Table 31. ALC Recovery Operation Waiting Period
ALC Recovery Operation Waiting Period
8kHz
16kHz
16ms
8ms
32ms
16ms
64ms
32ms
128ms
64ms
256ms
128ms
512ms
256ms
1024ms
512ms
2048ms
1024ms
44.1kHz
2.9ms
5.8ms
11.6ms
23.2ms
46.4ms
92.9ms
185.8ms
371.5ms
(default)
相關(guān)PDF資料
PDF描述
AK6002A Circular Connector; No. of Contacts:8; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:16-8 RoHS Compliant: No
AK6002AF Circular Connector; No. of Contacts:23; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:16-99 RoHS Compliant: No
AK6002AV The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each
AK6004A Circular Connector; No. of Contacts:26; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:16-26 RoHS Compliant: No
AK6004AF The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each
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