I got a problem with a LMV358.
I'm using the DAC of my µc (STM32f205). This output is wired on a voltage follower (realized with a LMV358). The output of this voltage follower is wired on four minus inputs of LMV358 (use as comparator).
The problem that I have is that if I put 0 in my DAC registrer, I got 0V on the ouput of my voltage follower, if I put 500 in my DAC registrer I got about 500mV, if I put 4096, I haven't 3.3V but 2.7V. My DAC is working, because if I disconnect my LMV358, everything isd working fine (4096 = 3.3V). It looks like a saturation ?
So I've tried with another AOP (MCP602), now I got the entire excursion in input (0-> 3.3V) but in output, the maximum voltage that I have is 2.1V.
If somebody got an idea, because I don't know how solve my problem. I've tried to add loads..