Question about LMV321LICT

[MichaelPasternak]

Dear Sirs!

I use in my design LMV321LICT manufactured by STMicroelectronics. And I faced very strange behavior.

LMV321LICT powered by +3V in mode of buffer or non inverting amplifier.

When for example there is +1.5V DC in plus input and gain 2, I see about +3V in output (no load).. It really work as rail to rail amplifier as expected.

But when there is +3V DC in plus input and gain 1, I see about +2.5 V on output (no load) but I expected to see +3V.

I have not found in datasheet any limitations about input voltage.

Can you please explain?

Is it a correct behavior for this amplifier or something wrong in my board?

Best regards

Michael

[AScha.3 · Accepted solution]

is as in ds :  max. input Vcc-1V ; so at 3V vcc max. 2V at input. 

+ if you want input range 0..vcc , need R2R input and output opamp !

[liaifat85]

You can find the information mentioned by the above answerer in paragraph 4.2 in the datasheet.

https://www.mouser.com/datasheet/2/389/lmv321l-1849682.pdf