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Is the power-down (power rails turning off) behavior of the AD8021 defined when using disable?

Question asked by dchopp on Sep 27, 2016

I have an AD8021 in a voltage follower configuration. It has a variable voltage reference on the input and uses the disable feature of the AD8021 to act as a high speed (relatively), variable voltage trigger.

 

The issue is I am seeing a glitch on the output when the power rails are falling, even when the part is in 'disable' mode. This causes downline equipment to trigger before its supposed to. The power is +/- 12 volts, but the disable is referenced to ground and triggered by a 3.3 volt signal. Is the power-down behavior of the disable defined?

 

Any solutions short of putting a fast relay inline to disconnect before the glitch?

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