SBOS487B June 2009 – March 2020 PGA280
Overload conditions can vary widely. There are multiple points in an instrumentation amplifier that can be overloaded. During input overload, the PGA280 folds the output signal partially back as a result of the differential signal structure and summing, but the error flags indicate such fault conditions. The amplifier recovers safely after removing the overload condition, if the amplifier is within the specified operating range shown in Figure 69.
Avoid dynamic overload by using adequate signal filtering that reduces the input slew rate to that of the amplifier. Fast signal jumps produced from multiplexed signal sources or gain changes cannot normally be filtered, but in such situations, the current buffer (BUF) stage can be activated to prevent current flowing through the input into the protection clamp.