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AD7608 Lockup problem... Very rare

Question asked by Jeff-at-Zeiss on Oct 18, 2016
Latest reply on Nov 21, 2016 by jcolao

We use AD7608 and AD7606 in a number of designs. Very rarely (every 6 months) a converter will stop functioning normally. When the converter stops working it produces a continuous stream of zero values across all channels. A valid reset pulse without removing power will restore the converter to full operation.

 

I suspect that we are glitching the reset line with pulses much shorter than the data sheet specified minimum (we have very high vacuum voltages exceeding 40kV in our system and we experience occasional high voltage arcs in our system which cause noise throughout the system). Arcs are rare, and the vast majority do not cause any troubles in the system, so we have no hard evidence of a cause and effect... but all of our other electrical issues always seem to boil down to arc susceptibility.

 

Does anyone have any experience with getting an AD7608 or AD7606 into a bad state with poor reset pulses? 

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