> > Actually, in this application termination will probably be supplied by
the
> > glasses. He wants his sync sep circuit to be rather high impedance so as
not
> > to load the signal 'on its way by'.
>
> Yes, but this got me thinking:
>
> Since I will be running the video signal (and the second video signal) in
> to a multiplexer, it will only see the termination impedence from the
> glasses half of the time, it would seem.
>
> Is there an easy way to feed in one video signal to some IC, and get out
> two, independent video signals?
>
> ie I end up with two signals, the first one can be terminated, and run in
> to the 1881, etc, without affecting the second signal, which I can then
> feed through the mux.
>
>
Without wishing to teach my granny to suck eggs, I would respectfully
suggest that you break the overall system down into sections. The first
problem that you need to solve is getting the LM1881 to produce a reliable
stream of odd/even frame pulses. Once you have solved that problem then you
can apply yourself to the problem of switching signals.

If you wish to continue attempting to resolve several problems at the same
time then Figs 4 & 5 on the data sheet should give you a clue. What are you
to do with the 3 unused gates on the CD4066 ?

You may also care to look at the Elantec Data sheet for the  EL1881 which
gives information on the reason for the input filtering  and the EL4581
which is a pin compatible enhanced version. Their data sheets also have more
detailed timing diagrams.

http://www.elantec.com




Regards

Chris

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