參數(shù)資料
型號(hào): AD9995
廠商: Analog Devices, Inc.
英文描述: 12-Bit CCD Signal Processor with Precision Timing ⑩ Generator
中文描述: 12位CCD信號(hào)處理器與精密計(jì)時(shí)⑩發(fā)生器
文件頁數(shù): 29/60頁
文件大小: 1593K
代理商: AD9995
AD9995
–29–
off positions. STROBON_FD is the field in which the STROBE
is turned on, measured from the field containing the last SUBCK
before exposure begins. The STROBON_ LN PX register gives
the line and pixel positions with respect to STROBON_FD. The
STROBE off position is programmable to any field, line, and
pixel location with respect to the field of the last SUBCK.
TRIGGER Register Limitations
While the TRIGGER register can be used to perform a complete
exposure and readout operation, there are limitations on its use.
Once an exposure-plus-readout operation has been triggered,
another exposure/readout operation cannot be triggered right
away. There must be at least one idle field (VD intervals) before
the next exposure/readout can be triggered.
The same limitation applies to the triggering of the MSHUT
signal. There must be at least one idle field after the completion
of the MSHUT OFF operation before another MSHUT OFF
operation may be programmed.
The VSUB trigger requires two idle fields between exposure/
readout operations in order to ensure proper VSUB on/off trig-
gering. If the VSUB signal is not required to be turned on and
off in between each successive exposure/readout operation, this
limitation can be ignored. The VSUB Keep-On mode is useful
when successive exposure/readout operations are required.
VD
SUBCK
STROBE PROGRAMMABLE SETTINGS:
1. ACTIVE POLARITY.
2. ON POSITION IS PROGRAMMABLE IN ANY FIELD DURING THE EXPOSURE TIME (WITH RESPECT TO THE FIELD CONTAINING THE LAST SUBCK).
3. OFF POSITION IS PROGRAMMABLE IN ANY FIELD DURING THE EXPOSURE TIME.
t
EXP
VSG
STROBE
1
2
3
TRIGGER
EXPOSURE
AND STROBE
Figure 31. STROBE Output Programmability
Table XII. VSUB, MSHUT, and STROBE Register Parameters
Range
High/Low
High/Low
Register
VSUBMODE[0]
VSUBMODE[1]
Length
1b
1b
Description
VSUB Mode (0 = Mode 0, 1 = Mode 1) (See Figure 29).
VSUB Keep-On Mode. VSUB will stay active after readout
when set high.
VSUB On Position. Active starting in any line of field.
VSUB Active Polarity.
MSHUT Active Polarity.
MSHUT Manual Enable (1 = Active or Open).
MSHUT On Position Line [11:0] and Pixel [23:12] Location.
Field Location to Switch Off MSHUT (Inactive or Closed).
Line/Pixel Position to Switch Off MSHUT (Inactive or Closed).
STROBE Active Polarity.
STROBE ON Field Location, with Respect to Last SUBCK Field.
STROBE ON Line/Pixel Position.
STROBE OFF Field Location, with Respect to Last SUBCK Field.
STROBE OFF Line/Pixel Position.
VSUBON[11:0]
VSUBON[12]
MSHUTPOL[0]
MSHUTPOL[1]
MSHUTON
MSHUTOFF_FD
MSHUTOFF_LNPX
STROBPOL
STROBON_FD
STROBON_LNPX
STROBOFF_FD
STROBOFF_LNPX
12b
1b
1b
1b
24b
12b
24b
1b
12b
24b
12b
24b
0–4095 Line Location
High/Low
High/Low
On/Off
0–4095 Line/Pix Location
0–4095 Field Location
0–4095 Line/Pix Location
High/Low
0–4095 Field Location
0–4095 Line/Pix Location
0–4095 Field Location
0–4095 Line/Pix Location
REV. 0
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