I tried replacing a TL082 which was working fine in the attached circuit with ADA4000.
I am very unhappy with the stability fo ADA4000. The input is from an DAC (100KHz) and the output is at output pin of Opamp.
What could be a direct replacement for…
is the ADA4000-1 can be used as a comparator instead of amplifier and is it a dedicated op-amp to work for this kind of use (e.g comparator)
It seems that ADA4000 is highly sensitive working as a comparator and it doesn't like this non linear…
I am searching one kind of opamp to work on +-18V. ADA4000-4 may be the choice as the datasheet said that "±4 V to ±18 V operation". However, I also found in the datasheet that the maximum supply voltage is "±18 V".
Thanks for the clarification. This question came from a customer of mine. The application is biologic spectral testing. Thanks for the heads up on the ADA4000-1, I will pass this info along to the customer.
You can refer to this link regarding maximum safe input overload condition of ADA4000.
I'm not familiar with gavanostats, but your circuit has positive feedback and will slam to the negative
rail as you have noted.
The AD711 is a very old part. Take a look at the ADA4000-1. Lower Vos, lower Isy, lower price.
Further to this. I have attached an application note about the ADG4612 part. This app note also shows what happens to our regular analog switches if you apply a signal with no supply voltage present (see Figure 2).