what is Output driving capability in op-amp ?
how should we measure it?
You should check it in the datasheet.
What is your application? I can recommend You AD8397 - nice and powerfull op-amp.
Typicaly You should look for maximum output current with regards to load resistance (again - check datasheet).
what if my load is purely capacitive?
still i need to check it by replacing cap as resistive load....
Output driving capability of an op amp is explicitly stated in datasheets. As far as i know there is no defined formula to compute for the output drive capability of op amps. It depends on the internal (output-stage bias current, architecture, drive level, etc.) and external (output voltage headroom, input overdrive, junction temp., etc.) settings.
You can refer to this mini-tutorial and this article for more details about output drive capability of op amps and driving capacitive loads.
Retrieving data ...