[time-nuts] Zero-Crossing Detector Design?

Dan Kemppainen dan at irtelemetrics.com
Thu Jul 19 20:35:39 UTC 2012


Or use a fast comparator such as an ADCMP600 series. Much lower 
delays, and faster rising/falling edges.
FYI, I've had good luck with this at 30Mhz. You could transformer 
couple this one, or simply couple it through a cap.

Dan

On 7/19/2012 3:47 PM, time-nuts-request at febo.com wrote:
> 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.

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