[time-nuts] minimalist sine to square
k8yumdoober at gmail.com
Fri Jan 19 15:22:58 EST 2018
I recently built such a device using a couple of stages of a 74HC04,
with the RF input to the 1st stage AC coupled and the input biased
by a high-value (a couple of megohms) resistor feeding back from
the output of the first inverter stage to the input of that stage. It's so
dirt simple, it's hard to beat.
I was not particularly concerned about jitter, so if you're not already
familiar enough with the circuit to know whether or not it's good
enough, it might be worth a try. BTW, I am running at 10 MHz from
a PRS-10 Rb, and just wanted something to drive a count-down
chain. And there's always the 74AC04 if you wanted faster edges.
On Fri, Jan 19, 2018 at 1:31 PM, Tom Van Baak <tvb at leapsecond.com> wrote:
> John's TADD-2-mini  uses the Wenzel sine-to-square converter. It
> performs very well but requires +10 V.
> I'm looking for a solution that works at 5 V (e.g., USB powered) and also
> uses fewer parts. Wenzel also mentions using a differential line receiver
> . That would be an ideal single-chip 5 V solution for me but the two
> parts he mentions, MC1489  and SN55182 , don't appear fast enough for
> a 10 MHz input.
> Can any of you circuit experts suggest some line receivers that would
> work? Maybe DS9637 ? This isn't for cesium work so it doesn't have to be
> quite as good as the TADD-2.
>  http://www.tapr.org/~n8ur/T2_Mini_Manual.pdf
>  http://www.wenzel.com/documents/waveform.html
>  https://www.onsemi.com/pub/Collateral/MC1489-D.PDF
>  http://www.ti.com/lit/ds/slls092d/slls092d.pdf
>  http://www.ti.com/lit/ds/symlink/ds9637a.pdf
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