[time-nuts] minimalist sine to square

Tom Van Baak tvb at LeapSecond.com
Fri Jan 19 14:31:23 EST 2018

John's TADD-2-mini [1] 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 [2]. That would be an ideal single-chip 5 V solution for me but the two parts he mentions, MC1489 [3] and SN55182 [4], 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 [5]? This isn't for cesium work so it doesn't have to be quite as good as the TADD-2.


[1] http://www.tapr.org/~n8ur/T2_Mini_Manual.pdf
[2] http://www.wenzel.com/documents/waveform.html
[3] https://www.onsemi.com/pub/Collateral/MC1489-D.PDF
[4] http://www.ti.com/lit/ds/slls092d/slls092d.pdf
[5] http://www.ti.com/lit/ds/symlink/ds9637a.pdf

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