參數(shù)資料
型號(hào)： AD9898
廠商： Analog Devices, Inc.
英文描述： CCD Signal Processor with Precision Timing⑩ Generator
中文描述： CCD信號(hào)處理器精確定時(shí)⑩發(fā)生器
文件頁(yè)數(shù)： 43/52頁(yè)
文件大小： 557K
代理商： AD9898
REV. 0
AD9898
–43–
MSHUT High Precision Operation
The MSHUTPOS_HP register allows more precise control of
the MSHUT position within a line. Under normal MSHUT
operation when MSHUTPOS_HP = 0, the MSHUT polarity
changes from high to low on the negative edge of the HD pulse,
as shown in Figure 44. By using the MSHUTPOS_HP register,
the rising and falling edges of MSHUT can be delayed by mul-
tiples of the OL counter length, which has been set in the OLEN
VD
HD
VSG1–
VSG2
MSHUT
t
EXP
MSHUTPOS = 3
MSHUTPAT = 0, MSHUTLEN = 5
1
2
3
1
2
3
5
4
6
SUBCK
COOL
COOL
COOL
COOL
Figure 46. Example of MSHUT High Precision Timing—MSHUTEN = 1 and MSHUTPOS_HP = 3
VD
HD
VSG1–
VSG2
MSHUT
1
t
EXP
MSHUTPOS = 3
MSHUTPAT = 0, MSHUTLEN = 5
1
2
3
1
2
3
5
4
6
SUBCK
DELAY = 3 OL
COUNTER LENGTHS
NOTES
1
MSHUT OUTPUT IN NORMAL OPERATION WITH MSHUTPOS_HP = 0
2
MSHUT OUTPUT IN HIGH PRECISION OPERATION WITH MSHUTPOS_HP = 3
MSHUT
2
Figure 47. Example of MSHUT High Precision Timing—MSHUTEN = 1, MSHUTPOS_HP = 3, with
SUBCKMODE_HP = 1, SUBCKNUM_HP = 3
register. For example, if MSHUTPOS_HP = 3, the MSHUT
rising and falling edges will be delayed by three OL counter
cycles after the falling edge of HD, as shown in Figure 46.
Figure 46 provides an example of high precision MSHUT and
SUBCK timing. In this example, the length of the OL counter
is shorter. This provides very precise control of the placement
of the MSHUT pulse within a line.
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