I have three question about AD8676 Current Limiting resistor.
#1 Is there Internal protective circuit in AD8676?
(for example, Protection diode)
#2 Is the input current limiting resistor necessary?
(for examnple, IN a case beyond the differential input voltage"±0.7V")
#3 When limit resistance is necessary, how much "mA" is it necessary to set a limit to?
I found that AD797 and AD8622 mention the current limit for protecting differential input voltage.
For AD797, it says that external resister is necessary.
On the other hand AD8622 has internal resister(500ohm).
Does AD8676 has inside protection resisters and what is the current limit ?
Hi ゆうや 近藤,
Sorry if we missed this thread. I just contacted our designer to verify the internal protection circuitry of the AD8676. I will get back to you on this as soon as I've heard any.
With regards to your other concern, generally we limit the current entering on the inputs by 5mA to avoid damaging the ESD cell. This is usually implemented by putting series resistors on the input pins.
For more information about opamps input protection, you may want to read these article:
Thank you very much.
I will refer to the materials.