I have an input voltage -10V to 10V from a DAC. The DAC can source approximately 4 mA. I need to scale the voltage as close to 0.1x as possible (source -10V to 10V to output -1V to 1V). The output is then fed into a motion control input.
What is the best way to accomplish this? I have considered the following:
- Inverting op-amp to scale the voltage 0.1x and then a second inverting op-amp to invert the voltage again
- Simple resistor-divider
- Unity gain op-amp -> resistor-divider
- Resistor-divider -> unity gain op-amp
- Option #1, omit the second op-amp and change the DAC firmware to output the opposite polarity (-10V instead of 10V). Motion control would be the same.
I have no idea what the best way to do this is. Does it matter? I do have +12V and -12V available for the op-amp.