[time-nuts] Frequency Dividers

Randy Warner Randy at synergy-gps.com
Tue Aug 8 17:28:18 EDT 2006


Said,

Thanks for the clue on the Philips part. Sounds like a nice solution.

I just got a couple of sample parts from Maxim that I am going to play
with (DS4000, MAX5121, and MAX6629). If they can do what Maxim claims it
might be a fun experiment. I have one of those little TI MSP430 dev kits
that I am going to try to use to run the show. We'll see.

Randy

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-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of SAIDJACK at aol.com
Sent: Tuesday, August 08, 2006 1:45 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] Frequency Dividers

Hi Randy,
 
I guess they like the intellectual challenge of tweaking PIC bits :)
 
There is what I think may be a better way to generate the 1PPS: you  can
use an Arm micro such as the Philips LPC2102 series to generate a 1PPS
output with 16.7ns settability:
 
these micros have counter/timers with 32 bits of resolution, they can
run  at 60MHz (6x the input of 10MHz using an internal PLL), and can
generate a pulse  output ("counter Match") anywhere in the second with
16.7ns resolution. They can  even generate multiple outputs, say 1PPS,
10PPS, 100PPS etc all in paralell.
 
On top of that, they can generate a software-selectable pulse-width, and
can synchronize themselves to a GPS 1PPS input.
 
Best of all, they are <<$2 in volume.
 
For cheap eval boards, see:
 
_http://www.sparkfun.com/commerce/product_info.php?products_id=667_
(http://www.sparkfun.com/commerce/product_info.php?products_id=667) 
 
That board can generate 5 independent pulse-outputs for $30.
 
bye,
Said
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