ADCMP572 can drive the load of 256pF?

Document created by analog-archivist Employee on Feb 23, 2016
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Will ADCMP572 can drive the load of 256pF? If not , which comparator can drive
that capacitance?

 

The comparator is built to drive 50 Ohm complex loads but doesn’t specify
capacitive load capability.

Basically, it will work, just the question is: what is the customer’s
expectation on rise and fall time (slew rates) with this huge capacitive load?
Also depending on the input frequency, the output may start to oscillate.

Even if not liked by the customers, my suggestion is to use something like the
ICS83115 by IDT as fan out buffer in between, here’s the link:
http://www.idt.com/products/clocks-timing/clock-distribution/clock-dividers-and-
fanout-buffers/83115-low-skew1-16lvcmoslvttl-fan-out-buffer

or the 853S024 also by IDT:
http://www.idt.com/products/clocks-timing/clock-distribution/clock-dividers-and-
fanout-buffers/853s024-low-skew1-24differential-33v25v-lvpecl-fanout-buffer.

and think about the architecture once again.

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