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參數(shù)資料
| 型號： | AD9995KCPZRL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 21/60頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CCD SIGNAL PROCESSOR 56-LFCSP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | CCD 信號處理器，12 位 |
| 輸入類型： | 邏輯 |
| 輸出類型： | 邏輯 |
| 接口： | 3 線串口 |
| 電流 - 電源： | 30mA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 56-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 56-LFCSP-VQ（8x8） |
| 包裝： | 帶卷 (TR) |
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AD9995
–28–
It is possible to independently trigger the readout operation
without triggering the exposure operation.This will cause the
readout to occur at the next VD, and the SUBCK output will be
suppressed according to the value of the READOUT register.
The TRIGGER register is also used to control the STROBE,
MSHUT, and VSUB signal transitions. Each of these signals are
individually controlled, although they will be dependent on the
triggering of the exposure and readout operation.
See Figure 32 for a complete example of triggering the exposure
and readout operations.
VSUB Control
The CCD readout bias (VSUB) can be programmed to accom-
modate different CCDs. Figure 29 shows two different modes
that are available. In Mode 0, VSUB goes active during the field
of the last SUBCK when the exposure begins. The On position
(rising edge in Figure 29) is programmable to any line within
the field. VSUB will remain active until the end of the image
readout. In Mode 1, the VSUB is not activated until the start of
the readout.
An additional function called VSUB KEEP-ON is also available.
When this bit is set high, the VSUB output will remain on (active)
even after the readout has finished.To disable the VSUB at a later
time, set this bit back to low.
MSHUT and STROBE Control
MSHUT and STROBE operation is shown in Figures 30, 31,
and 32.Table XII shows the register parameters for controlling
the MSHUT and STROBE outputs.The MSHUT output is
switched on with the MSHUTON registers, and will remain on
until the location specified in the MSHUTOFF registers.The
location of MSHUTOFF is fully programmable to anywhere
within the exposure period, using the FD (field), LN (line), and
PX (pixel) registers.The STROBE pulse is defined by the on and
VD
SUBCK
VSUB OPERATION:
1. ACTIVE POLARITY IS POLARITY (ABOVE EXAMPLE IS VSUB ACTIVE HIGH).
2. ON POSITION IS PROGRAMMABLE. MODE 0 TURNS ON AT THE START OF EXPOSURE, MODE 1 TURNS ON AT THE START OF READOUT.
3. OFF POSITION OCCURS AT END OF READOUT.
4. OPTIONAL VSUB KEEP-ON MODE WILL LEAVE THE VSUB ACTIVE AT THE END OF READOUT.
t
EXP
VSG1
VSUB
3
1
2
READOUT
2
4
MODE 0
MODE 1
TRIGGER
VSUB
Figure 29. VSUB Programmability
VD
SUBCK
MSHUT PROGRAMMABLE SETTINGS:
1. ACTIVE POLARITY.
2. ON POSITION IS VD UPDATED AND MAY BE SWITCHED ON AT ANY TIME.
3. OFF POSITION CAN BE PROGRAMMED ANYWHERE FROM THE FIELD OF LAST SUBCK UNTIL THE FIELD BEFORE READOUT.
t
EXP
VSG
MSHUT
3
1
2
TRIGGER
EXPOSURE
AND MSHUT
Figure 30. MSHUT Output Programmability
REV. 0
OBSOLETE
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