I have a 0-5V signal that I want to quantize using an ADC with a 0-3.3V input range.
I want to lower the signal maximum amplitude with the following arrangement:
Is it better to power the second opamp with 5V or 3.3V?
Advantages I see for 3.3V:
- The output can never exceed the maximum input of the ADC (act as a protection).
Advantages I see for 5V:
- Can buy a dual opamp chip and use a single supply for both (both opamps can have better matching if this is useful for anything).