[time-nuts] Data collection cycle -- multiple sources to one counter?
david.kirkby at onetel.net
Mon Jun 20 17:41:16 EDT 2005
Poul-Henning Kamp wrote:
> Instead of minicircuits I would be looking for video-cross-bar chips.
Any reason to prefer them over the pin diode or GaAs switches from
Minicircuits? I must admit to having no idea how they would compare here.
> Maxim as a bunch:
> A MAX458 8x4 switch would be able to drive two counters which could
> measure any two of eight sources against each other.
> There is even an eval board which does most of the job already:
> As far as I can tell you could drive it from a parallel port
> with bit-banging.
One thing to note is that Maxim have a *very* nice policy on samples,
which effectively means for experimental purposes, the chips are free.
Just register on their web site, tick what chips you want (limit of
about 6 or 8, no more than two of the same type) and they courier them
to the next day. If you need more than a couple of one type, pick a
standard and an extended temperature range model, and perhaps a mil spec
one too. Or order some more the next day.
I don't think you can get evaluation boards for nothing, but I have not
In contrast, I've always had to pay for Mincircuits bits, but do happen
to have one of their PIN diode switches sitting around.
Please check out http://www.g8wrb.org/
of if you live in Essex http://www.southminster-branch-line.org.uk/
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