[time-nuts] No State Of The Art Counter

Tijd Dingen tijddingen at yahoo.com
Mon Jan 10 03:40:14 UTC 2011

Indeed. The ADCMP573 and ADCMP553 are already on my digikey order list. :) Complete with nice pecl output that I can connect to the LVPECL input of the spartan-6.

Thanks for the tip though, always good to know I'm not the only one who thinks of using it. let's call it confirmation. Thanks! :)


PS: If you want to spend a lot of money on a high speed comparator, check out the 25706CP.


Awesome 25 GHZ low jitter specs can be yours ... for only $800. *cough*

So yeah, I'll stick with the ADI parts for now.

--- On Mon, 1/10/11, Geraldo Lino de Campos <geraldo at decampos.net> wrote:

> From: Geraldo Lino de Campos <geraldo at decampos.net>
> Subject: Re: [time-nuts] No State Of The Art Counter
> To: time-nuts at febo.com
> Date: Monday, January 10, 2011, 2:26 AM
> Take a look in Analog Devices
> ADCMP572/573. Very fast comparators,
> easy to add DC offset and hysteresis.
> >How will the input side work? How will you handle input
> signals of
> >various kinds? In particular sine of various amplitudes
> and frequencies.
> >Slew-rate can be a limiting factor as white noise will
> convert into
> >jitter if hitting a straight comparator. Choice of
> trigger point can be
> >done to achieve lowest jitter, so just AC-blocking and
> trigger on the 0V
> >may not be the best solution if shape is not well
> known. Noise of input
> >stage comes into play.
> -- 
> ------------------------------------
> Geraldo Lino de Campos
> geraldo at decampos.net
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