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LMP7721MAEVALMF_NOPB: LMP7721 Evaluation Board Railing for a long period of time


Hi TI Engineers!

I purchased a couple of LMP7721 Evaluation boards (4 or 5) and I noticed they all shared the same issue. When the LMP7721 is railed, it will take a around 300 seconds to get to an un-railed value. The LMP7721 is setup in a transimpedance amplifier configuration with a feedback resistor of 5T and capacitance of 2pF. When the op amp is not railed, the time response is close to R*C of the configuration. I'm using the evaluation board to measure charged particles. Is there an explanation for this phenomena?