Data Translation DT3152-LS, User Manual

Page: 26 / 214

Chapter 2
10
Video Input Channels
The DT3152-LS frame grabber board supports four monochrome
video inputs.
The DT3152-LS board can accept an AC-coupled video input signal
from one of four software-selectable video channels (0 to 3), or a
DC-coupled input from video channel 3 only. The channel is
software-selectable.
To accept a DC-coupled signal from channel 3, you must install
jumper W1 on the board. Refer to the
DT3152-LS Getting Started
Manual for more information.
AC coupling allows the video signal to pass through the clamping
circuit, while DC coupling causes the signal to bypass the capacitor
that is in line with the video signal as well as the clamping circuit
before the video multiplexer; refer to
Figure 2 for an illustration of the
clamping circuit.
By default, an AC-coupled signal type is selected.
Figure 2: Video Selection
VID0
VID1
VID2
VID3
o
o
o
o
o
o
o
o
50Hz
60Hz
AC
DC
o
o
o
o
o
o
OFFSET
GAIN
1.07 V 0.5, 1, 2, 4
+
C2
CLAMP
SYNC
STRIPPER
HORZ SYNC
H
V
VERTICAL SYNC
LINE_SYNC
FRAME_SYNC