Hello all,
I am trying to use on board analog comparators on F28035 piccolo microcontroller. Attached is the circuit. A sine wave is filtered using a low pass filter (giving 60deg phase shift, which is required in my design) (120K and 0.33u). As I connect the input to the ADC pin A2, there is drop in input voltage waveform. But when I use the unfiltered sine wave, I can see the square wave output on GPIO20.
I am guessing the external filter resistance of 120K is too high ? How can i get around this problem? My choice is to use a simple low pass RC filter that can give 60deg phase shift and obtain square waves at GPIO20, 21 and 34.
