[time-nuts] Achieving maximum performance when driving 5370A/B inputs

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sun Feb 28 00:01:52 UTC 2010


The attached excerpts from the 5370A and 5370B manuals indicate that for 
best performance, that the common practice of driving the 5370A/B 1x 
inputs directly from a 5V CMOS logic signal is a bad idea.

For the 5370A attenuating the 5V CMOS signal to a 1V swing with the 
threshold set to 0.5V is close to optimum.
An input signal with limits of 0V and +1.4V with a trigger threshold of 
0.7V is the maximum usable (for high performance).
An input signal with limits of 0V and +0.3V with a trigger threshold of 
0.15V is the minimum usable (for high performance).

For the 5370A attenuating the 5V CMOS signal to a 2V swing with the 
threshold set to 1V is close to optimum.
An input signal with limits of 0V and +3.5V with a trigger threshold of 
0.7V is the maximum usable (for high performance).
An input signal with limits of 0V and +0.3V with a trigger threshold of 
0.15V is the minimum usable (for high performance).

Bruce

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