I checked the AD8418 and A datasheet.
Those are almost same, but those actual features seems a little different.
What feature has improved?
I checked again. Figure 3 to 25 are totally different. Slew rate , Gain vs Freq, bias current and output sink current etc... Sorry, I misunderstood. Those are totally different circuit, I think. How come those are same name? Please tell us how to select A or non A. Those are for different application? Regards moto