Both the outputs (REF and OUT, pins 9 and 15) are affected by the jump or only the delayed one has the problem? Anyway it is strange that a device that can only delay a maximum of 100ns, suddenly goes into the milliseconds. The only millisecond time I see in the datasheet is the turn-on delay, so check that the power supply is correctly applied.
On Tue, Feb 3, 2015 at 6:20 PM, Martyn Smith <[email protected]> wrote: > Hello, > > I am using a LEA-6T GPS chip with the DS1123LE-50 delay line to correct the > jitter of the 1 pps output from the GPS chip. > > The correction works very well, dropping the peak to peak jitter of the 1pps > output from about 20 ns to < 3 ns. > > However, I randomly get a big jump of the 1 pps pulse, by many > millisceconds. > > After lots of research, checking code and hardware, it seems the DS1123LE-50 > chip randomly produces it's own long pulse. > > I have monitored the pulse going into and out of the delay line > > The input pulse remains constant (I can't remember exactly the pulse width, > I think 10 us). > > But suddenly a large output pulse of many milliseconds appear. > > Some chips don't seem to have this problem. Other chips can go wrong, 20 > times in an hour, then run perfectly for a day or so. > > I am blaming my software guy, he is blaming the chip. > > Has anyone else used this delay line and seen anything similar? > > This chip is now apparently obsolete, but I don't want to change yet as I > have a few years worth of stock of these chips. > > Regards > > Martyn > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
