ADuCM360 ADC protection diode max current

I am using the ADuCM360 ADC to measure a signal with 1.6V common mode using PGA Gain = 2. The differential signal is typically small and fits within the ±500mV PGA input range, however, it is driven by an op-amp with ±5V rails. Under certain conditions the input to the ADC can swing to ±4.6V but I have included a 100Ω series resistor to limit current into the ADC's protection diodes.

Question: How much current can the ADC protection diodes divert? I do not see this information in the datasheet or manual, only an absolute max voltage of -0.3V to +3.96V. Are there other side effects to providing an ADC input this far over range?