[time-nuts] Data collection cycle -- multiple sources to one counter?

David Kirkby 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:
> 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.

David Kirkby,

Please check out http://www.g8wrb.org/
of if you live in Essex http://www.southminster-branch-line.org.uk/

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