Are AD628 and AD629 able to survive to a 4kV ESD pulse of 1 to 3ns at their inputs ?
Apologies if I missed this thread. We test ESD according to the industry standards for every part and you can refer to this Reliability Handbook (UG-311) for the test methods. We checked the part and we don't think it will survive 4kV, so to be safe, I recommend to use an external protection.
Let me know if you need anything else.