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By checking the datasheets, one will find that there are ways to protect the inputs, generally involving adding resistors in front of the amplifier. The resistor limits the current flowing into the input pins. Almost all integrated circuits now have ESD diodes at the inputs to protect against ESD shocks. By choosing the resistor values, these same diodes can be used to protect against high voltage if the diode current is limited to a few milliamps, 5mA for example The engineer should check the datasheet or with ADI to ascertian the maximum allowable protection diode currents. The other solution is to divide down the voltages before they reach the inputs of the amplifier. This can be achieved with external resistors by carefully making sure these external resistors do not degrade the important performance specs of the amps, in particular CMRR. ADI markets a whole line of parts that have matched integrated resistors to divide down the voltage. By using on of these components the customer can save design time to get higher accuracy.
