I fully understand Input overvoltage protection for the amplifier (page 16).
Let us AD8610 , PS +- 16V, on + input serial protective resitor 100k.
What maximum non destrucitve voltage on +input AD8610?
The input overvoltage protection is computed this way.
The result of 880ohms is the minimum resistance that you can use for an input voltage of 18V and usually we set 1kohms for this to limit the current more. In the datasheet, it states 10kohms and it is a more conservative way of making sure that the current will not exceed 5mA. Take note that adding this large resistance would also add noise and offset voltage which may be undesirable. With this, it is advisable to use resistance value as low as possible but also consider the Vin.
Hope this helps!