[time-nuts] minimalist sine to square

Bruce Griffiths bruce.griffiths at xtra.co.nz
Fri Jan 19 17:52:14 EST 2018


Now, if one added an optional TTL threshold 5V CMOS single gate inverter/buffer to produce 5V output when required and added an SMT 5V->3.3V regulator and mounted it all on a small PCB with pins to make it DIP compatible that would meet the brief and then some.

Otherwise an SMT (not many DIP ones left) comparator mounted on a DIP/SMT converter board would also work albeit with a PN/jitter performance penalty.    

Bruce

> On 20 January 2018 at 11:37 Gerhard Hoffmann <dk4xp at arcor.de> wrote:
> 
> 
> 
> 
> Am 19.01.2018 um 20:31 schrieb Tom Van Baak:
> > 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.
> <     http://cds.linear.com/docs/en/datasheet/6957fb.pdf >
> <     http://cds.linear.com/docs/en/design-note/dn514f.pdf >
> 
> I have used it, found no problems. It is somewhat small :-)
> 
> regards, Gerhard
> 
> 
> 
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