Data Translation DT3152-LS, User Manual

Page: 34 / 214

Chapter 2
18
Figure 6: Use of Reference, Offset, and Gain
Pixel Clock
The pixel clock determines the video input signal digitization rate.
Pixels are available to the DT3152-LS frame grabber board at
increments of PixelPeriod, which is equal to 1 / pixel clock frequency.
To determine the appropriate pixel clock frequency, divide the
number of pixels per line (including the active pixels and blank
pixels) by the length of the horizontal line (in time).
−
0.5 V
0 V
0.5 V
1.0 V
1.5 V
2.0 V
Reference = .75 V
Signal with offset = 0.4032 V;
reference = 1.0 V; gain = 1
Signal with offset = 0.4032 V;
reference = 0.75 V; gain = 0.5