[Redegle]

S.12

http://www.linear.com/pc/downloadDocumen...1016fc.pdf

Another output-caused fault is shown in Figure 13. The
output transitions are initially correct but end in a ringing
condition. The key to the solution here is the ringing.What
is happening is caused by an output lead that is too long.
The output lead looks like an unterminated transmission
line at high frequencies and reflections occur. This accounts
for the abrupt reversal of direction on the leading
edge and the ringing. If the comparator is driving TTL this
may be acceptable, but other loads may not tolerate it. In
this instance, the direction reversal on the leading edge
might cause trouble in a fast TTL load. Keep output lead
lengths short. If they get much longer than a few inches,
terminate with a resistor (typically 250ohm to 400ohm).


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