I would like to expose the input of the AD8066 device to a 50 volt pulse for a few microseconds. Will this damage the chip?
If an IC is subjected to an abnormal condition, it can fail due to power dissipation, or excessive E-field
(breakdown), or several other causes. Usually, op amps or instrumentation amps that are interfaced
to the outside world are protected with resistors, clamping diodes, transorbs, etc. If it's not
proprietary, can you post a partial schematic?
YES!!! In the world of silicon, microseconds are like days.
Thanks for that. Have you any idea just how long one could expose the AD8066 to a 50V pulse? And if your answer is less than a few pS then can you suggest a similar device which would less sensitive to damage.
Thank you for your response. I am attempting to observe the current flowing into a sample of pure water following the application of a voltage step which has a fast rise time. I wish to monitor this current as a function of time by observing the voltage drop down a 10-50kOhm resistor using possibly a pair of AD8066 amps feeding into two channels of a scope. It is just possible that I could reduce the voltage step from 50v to 25v and thus not over tax the op amp but until I perform the experiment I will not know. So all I am trying to do is pass a small current (~20nA) down a resistor and measure the voltage drop as a function of time. The problem is that I may need quite a high voltage to trigger the current flow.
O.K. I can't think of any obvious way to do this. Maybe someone else will jump in........
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