I'm designing a voltage measurement adaptor. And my signals are PWM type which ranges from 0-36V. I thought of using Op-amp to step down to 0-5V range and use an ADC to convert analog signals into digital.
To have a gain of <1,i'm using an inverting Op-amp (LT1630) where I can have split supply of (+18V to -18V) but then I have problem of connecting my input signal to a common ground zero(to avoid floating of input signal), so is it possible to give -36V at negative reference and ground the positive reference ?
LTspice simulation gives expected output (Gain of less than 1) with -18V at negative reference and Grounded positive reference for 36V input. How is that possible?