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

Azelio Boriani azelio.boriani at screen.it
Sun May 18 17:07:06 EDT 2014


As you can tell from the manual, the M12+ and the M12M will output a
signed -128..+127ns correction from the @@Hn message. In my opinion
you have to start from a fixed delay (an offset) in order to apply the
negative correction. I already have the Dallas/Maxim delay line but
still not used it.

On Sun, May 18, 2014 at 10:24 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
>
>
> TIA
> CFO - Denmark
>
> --
> e-mail: xnews3 at luna.dyndns.dk
>
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