ADC buffer LMV358

Simulation results.

IN: 0-15V

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Open

Red: input, Green: + U2, Yellow: U2 output

I setup a gain of 2 which means we get almost a full range from 0-3.3 when the input is 0-15V.

IN: 0-5V

IN: 3.5-5V this would be our normal operational range

We can se a delta of 290mV with a max of 1V, If w configure the analog channel to max 1.1V input using ADC_ATTEN_2_5db we get a resolution 0,268555 mV/bit hence 1080 bits of range from full to empty charge.