THS4521: Random Resistance - Pin 1 and 4

Hi Anatoli,

I guess with the THS4521 unpowered?

Why would you want to carry out such a measurement?

Resistance measurements at unpowered OPAmps make no sense, because the current flow merely depends on unpredictable leakage currents and floating potentials.

Kai

We were getting different voltages readings while powered on

Well Anatoli, 

You need to be more specific on what you are doing, If I assume the 8pin package, you are measuring from one output to the feedback input - normally, that is a feedback resistor you should have there - 

Also, you should be using the much improved THS4551 that was done to fix some issues in the THS4521

We are seeing the amps that dont work read a resistance while the ones that do read infinate between pin 1-4

Hi Anatoli,

what do you mean by "don't work"? Please elaborate.

Can you post a schematic?

Kai