LMV641: LMV641 differential input of Vid principle

Hi Pei Gong,

I think that there may be a typo in min (+/-0.3V) column in differential input requirements. It should have been left blank. 

LMV651 and LMV641 are very similar, and it looks like that they are in the same family. Here is what the datasheet is specified. 

Normally, the input of V+ and V- in op amp will follow each other anyway as open loop gain is high. So it is not likely that they should vary more than 300mV,  unless the op amp is damaged or will be damaged (such as a large transient conditions at Op Amp's input or output pins,  if they are unprotected. 

Best,

Raymond

Hi Pei,

and the feedback resistors will usually sufficiently limit the current. If the feedback resistors are rather low ohmic (in a non-inverting amplifier stage), an additional current limiting resistor in series to the +input can be helpful.

To furtherly discuss your circuit, you could post the schematic here.

Kai

HI Tamara

The issue was resolved.

please close the thread.Thank you!