[time-nuts] minimalist sine to square

jimlux jimlux at earthlink.net
Fri Jan 19 15:03:07 EST 2018


On 1/19/18 11:31 AM, Tom Van Baak wrote:
> 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.


What about the plethora of LVDS receivers - they're basically a 
differential input thresholder, with deliberate hysteresis, looking for 
a 300 mV shift across a 100 ohm resistor.

Plenty fast (GHz)




> 
> Thanks,
> /tvb
> 
> [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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