[time-nuts] IC for 1 PPS Output

Brooke Clarke brooke at pacific.net
Fri Apr 7 04:14:29 UTC 2006


Hi:

I've got the TVB 1 PPS PIC circuit working and would like to add an 
output IC to drive 50 a couple of Ohm cables.
Need two outputs, the normal 1 PPS and also the 10 kHz output since I 
think it would work with the SRS app note for making 1,000 TI 
measurements in one second to better see small offsets.

I seem to remember that there may be an internal resistance already in 
some chips so putting a 47 or 50 Ohm resistor in series may result in an 
impedance above 50 Ohms.  Any thoughts?

Thanks,

Brooke Clarke

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