I have a question regarding running the AD7980 at high speed (> 500Ksps updates ). The question is related to what happens when a transient (high passed pulse) that exceeds Vref for the ADC is presented to the input of the ADC for a short period of time (5us) ?
- we are observing some kind of charge redistribution over a few samples after the event.
- how bad is what we are doing to the part ?
- when we present these pulses do we put the part in a diodes clamped state to protect the input and all bets are off on the output ?