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: http://para.maxim-ic.com/compare.asp?Fam=Vid_Mux_Buff&Tree=SwitchMux&HP=SwitchMux.cfm&ln= A MAX458 8x4 switch would be able to drive two counters which could measure any two of eight sources against each other. http://pdfserv.maxim-ic.com/en/ds/MAX458-MAX459.pdf There is even an eval board which does most of the job already: http://pdfserv.maxim-ic.com/en/ds/MAX459EVKIT.pdf 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 actually tried.
In contrast, I've always had to pay for Mincircuits bits, but do happen to have one of their PIN diode switches sitting around.
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