Page 13 operation, 2 external synchronization, 3 asynchronous reset with shutter – JAI TM-6710 User Manual
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Page 13
Operation
TM-6710/6710CL High-Speed Progressive Scanning CCD Camera
3.3.2 External Synchronization
The TM-6710 can take external H
D
and V
D
for
phase locking. The internal PLL will take external
H
D
and lock with the CCD H
D
. (The CCD H
D
frequency is half of the analog video output H
D
.)
Example: Ext. H
D
= 30.49KHz, V
D
will be 120Hz
and Master Clock will be 50.98MHz.
The internal sync generator will take external V
D
to
generate internal V
D
. External V
D
frequency should be the same as the frame rate.
3.3.3 Asynchronous Reset with Shutter
To activate the asynchronous reset mode, use the Mode control switch on the back panel of the camera
(TM-6710). The asynchronous trigger input (VINIT) is applied to pin #6 of the 12-pin connector (TM-
6710) or pins #9 and #22 of the Camera Link connector (TM-6710CL).
The TM-6710’s asynchronous reset is flexible and takes external H
D
for phase
locking. Applying a VINIT pulse resets the camera’s scanning and purging of
the CCD. When async reset pulse (VINIT) is applied to High state (+5V) with
dial switch select from 1 to 9, the TM-6710’s asynchronous camera discharges
the photo charges into the substrate drain although the camera is still running on
its sync timing and only outputs captured video. When the negative going reset
pulse is applied, the camera will latch the falling edge to its next horizontal
drive and reset vertical sync timing immediately. Then it starts integrating for
the period of shutter control set by either an external pulse width pulse or internal shutter control.
Therefore the horizontal phase will not be interrupted. The TM-6710 asynchronous camera will output
one frame of shuttered video after reset.
There are three modes to control the asynchronous reset and shutter speed:
•
External Pulse Width Control Mode
TABLE 1.
Shutter Control
Set
Manual Mode
Async Reset Mode
0
No Shutter (1/120)
No Shutter (1/120)
1
1/250
128H
1/32,000
1.0H
2
1/500
64H
1/16,000
2.0H
3
1/1,000
32H
1/12,000
3.0H
4
1/2,000
16H
1/8,000
4.0H
5
1/4,000
8.0H
1/4,000
8.0H
6
1/8,000
4.0H
1/2,000
16H
7
1/12,000
3.0H
1/1,000
32H
8
1/16,000
2.0H
1/500
64H
9
1/32,000
1.0H
Shutter determined by pulse width
External Sync Input Schematic
OUTSIDE
CAMERA
INSIDE CAMERA
Ext H
D
(or Ext V
D
)
4.7k
R1
1µF
C1
1
0
2
3
4
5
6
7
8
9
Shutter Control Switch