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)： 42/52頁(yè)
文件大?。?/td> 557K
代理商： AD9898
REV. 0
–42–
AD9898
MSHUT CONTROL
MSHUT Basic Operation
The AD9898 provides an MSHUT output pulse that can be
configured to control the mechanical shutter of the camera.
The registers used to control the MSHUT pulse are listed in
Table XXV.
The MSHUT pulse can be placed at the start of any line by using
the 11-bit MSHUTPOS register. The MSHUT pulsewidth is
controlled using the MSHUTLEN register.
Table XXV. MSHUT and STROBE Registers
Register Name
Bit Width
Register Type
Description
MSHUTPAT
2
Control (Addr 0x01)
Selects MSHUT Pattern (See Figure 44)
(0 = MSHUTPAT0, 1 = MSHUTPAT1, 2 = MSHUTPAT2,
3 = MSHUTPAT3)
MSHUT Initialize
(1 = MSHUT Output Held LOW, 0 = Normal Operation Resumes)
MSHUT Control (0 = MSHUT Held at Last State,
1 = MSHUT Output Enabled for Normal Operation)
MSHUT Position during Normal Operation
MSHUT Position during High Precision Operation
MSHUT Pattern Length (See Figures 44 and 45)
STROBE Output Enable Control
(0 = STROBE Output Held Low, 1 = Enable STROBE Output)
MSHUTINIT
1
Control (Addr 0x0C)
MSHUTEN
1
Control (Addr 0x0C)
MSHUTPOS
MSHUTPOS_HP
MSHUTLEN
STROBE_EN
11
3
8
1
Control (Addr 0x0C)
Control (Addr 0x0C)
Sys_Reg(13)
Control (Addr 0x0B)
HD
MSHUTPAT0
MSHUTPAT1
MSHUTPAT2
MSHUTPAT3
MSHUTLEN + 1
Figure 44. MSHUT Patterns Available by Setting MSHUTPAT Register
VD
HD
VSG1–
VSG2
MSHUT
MSHUTPOS = 3
MSHUTPAT = 0, MSHUTLEN = 5
t
EXP
1
2
3
1
2
3
5
4
6
SUBCK
Figure 45. Example of MSHUT Timing with MSHUTEN = 1 and MSHUTPOS_HP = 0
The AD9898 offers four preprogrammed MSHUT patterns that
are selectable using the MSHUTPAT register. The
preprogrammed length is the same for all patterns set by the
MSHUTLEN register, but the active ON period of the
MSHUT pulse is different for each pattern, as shown in Figure
44. Figure 45 shows an example of selecting MSHUTPAT0
positioned to start three lines after the falling edge of VD with
MSHUTLEN = 5.
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