I am trying to take a DC voltage that varies slowly from 2 millivolts through 50 millivolts and convert it to .2V through 5V linearly. I have a single supply available. Easy task for an op amp right? Each op amp I try gets flaky and non linear on the lower voltage end. I have heard good things about the MAX4239 and the MCP6V01. Does anyone have any idea if either of these would work better than the MC3320 rail to rail unit that I have been trying to use? Any op amp recommendations are welcome!