We were using AD8620 Op Amp in our previous application but now want to use the ADA4857 op amp as integrator / charge amplifier. I have compared the following parameters of both the op amps
Should I go ahead with the ADA4857 in our application as charge amplifier?
Do I have to compare any other parameters?
What should be the selection criteria as a charge amplifier/integrator?
The question to ask is why did you choose the AD8620 initially?
Is it the precision aspect? (offest voltage, input current,...)
Is it the cap load driver?
Is it speed?
Based on that, you can see if these functions match up and you can make your decision.