The AD1974 datsheet specifies the following for maximums:
Input Current (Except Supply Pins) ±20 mA
Analog Input Voltage (Signal Pins) –0.3 V to AVDD + 0.3 V
Is it possible to exceed the input voltage spec. without damaging the device if the
current is limited to less than 20ma? We are using the Figure 17. Typical ADC Input Filter Circuit
which has the 237 ohm input resistors which would provide some current.limiting.