[time-nuts] Zero-Crossing Detector Design?

[Azelio Boriani]

This is sort of a FAQ: the argument was already discussed here. One of the
most interesting idea (in my opinion) is to use an RS485 line receiver like
the ST3485, MAX483, ADM485. They are actually transceivers so they must be
tied permanently in RX. Since they are differential you can also put a 1:1
(or a 1:4 to raise the level) transformer to isolate the input too.

On Thu, Jul 19, 2012 at 6:03 PM, Chris Hoffman <cq.kg6o at gmail.com> wrote:

> Can anyone suggest a good reference design for a zero-crossing detector? I
> am trying to home an ADC sampler trigger to the 1VRMS (50ohm) 10MHz sin
> from my XL-DC... And now I'm thinking that I should just home the uC clock
> to it, as well.
>
> Essentially, I believe that I'm looking for an efficient, stable, and
> accurate sine-to-square converter... and I'll welcome any advice in this
> area.
>
> This may also be used in a 1KHz 5Vpp IRIG-B decoder... I don't feel like
> rectifying the signal, to be honest. I want to try to keep a smaller BOM,
> sense the waveform primarily, and crunch numbers inside the uC.
>
>
> -CH
>
> Chris Hoffman
> cq.kg6o at gmail.com
> http://ar.ctur.us
>
>
>
>
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