[time-nuts] Can (will) a M12+T generate a negative sawtooth message ?

Bob Camp kb8tq at n1k.org
Sun May 18 21:37:00 UTC 2014


The DS1023 will not do negative delays. Physics people would be very interested in it if it did. 

You will need to add a nominal delay of 1/2 the max DS1023 delay to the data coming out of the M12. Also pay careful attention to which PPS the message applies to (the most recent one or the next one). If it’s the most recent one you will need to think about how to implement DS1023 based correction. The PPS will likely be out of the delay line by the time you have decoded the serial string with the data in it. 


On May 18, 2014, at 4:24 PM, cfo <xnews3 at luna.dyndns.dk> wrote:

> I have 2 x M12+T , and a DS1023-100 Dallas chip.
> I'm going to use the DS1023 to make sawtooth correction , but the DS is a 
> bit unclear.
> http://datasheets.maximintegrated.com/en/ds/DS1023.pdf
> 1: 
> What is the REF output used for ?
> As i read it it shows the "internal delay" through the chip. And can be 
> used to subtract that delay if needed.
> But they also talks about temperature compensation etc.
> Does one use that signal in the active circuit ?
> I was thinking about just measuring it once.
> 2: 
> If the M12+T can/will output negative sawtooth delays , can i just write 
> the byte into the DS1023 , and the sign of the byte will automaticly 
> adjust for positive/negative delay ?
> Or do i have to add a fixed delay ie. 50ns to the value , in order to be 
> able to make a "negative/early"  pulse of max 50 ns ?
> I have just found the DS of the 1123 , and it might be a bit clearer i 
> hope.
> http://datasheets.maximintegrated.com/en/ds/DS1123L.pdf
> I hope someone here might have practical experience with the DS1023
> CFO - Denmark
> -- 
> e-mail: xnews3 at luna.dyndns.dk
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