LM1881
www.ti.com
SNLS384F –FEBRUARY 1995–REVISED MARCH 2013
MULTIPLE CONTIGUOUS VIDEO LINE
SELECTOR WITH BLACK LEVEL RESTORATION
The circuit in Figure 11 will select a number of adjoining lines starting with the line selected as in the previous
example. Additional counters can be added as described previously for either higher starting line numbers or an
increased number of contiguous output lines. The back porch pulse output of the LM1881 is used to gate the
video input's black level through a low pass filter (10 kΩ, 10 µF) providing black level restoration at the video
output when the output selected line(s) is not being gated through.
Typical Applications
Figure 10. Video Line Selector
Copyright © 1995–2013, Texas Instruments Incorporated
Submit Documentation Feedback
9
Product Folder Links: LM1881
TI [ TEXAS INSTRUMENTS ]
