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.
