i have a board with ADC input rated 0-10V.
The power supply of the system is 24V (big truck).
I would like to interface a temperature sensor on the board, i have choosed TMP36 with positive output for all temperature range, about 150mv-1500mv.
What i need is to amplify the sensor output about 5-6 times before i feed the signal to the ADC input.
I have tried a very common circuit, an opamp with single supply, the sensor signal connected to the positive input and two resistor with a ratio of x5.
It works for input signal > 500mv but less than that the output starts to go higher that getting lower till it gets to voltage rail.
I tried many opamps, cheap and expensive . JFET input and Rail-to-Rail with common results.
Do you have any idea how can i amplify the signal even at low ranges of 200-300mv or what am i doing wrong?
thank you for your time!