Question

The figure is a voltage divider used to measure a signal that is expected to be in the 0V-50V range. Choose resistor values for R1 and R2 to allow an ADC with a +3.3V reference to accurately measure this input.

VOLTAGE IN ??? RIM TP1 VOLTAGE OUT) ocel| 15 MMSZ5227B GND GND GND

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Answer #1

For the given circuit

VOLTAGE IN TP VOLTAGE OUT MMSZ5227B ਮਾਵੇ ਜਾਵੇ

The Voltage Range is from 0 to 50V And reference voltage is 3.3V; Thus the resolution of ADC can be calculated as Vref Resolu

So we need to convert 1V input to 0.05V so that ADC can output it as 000001 The voltage across R2 will be input to ADC. Thi

0.05 = R2 - * 1 R1 + R2 R2 5 R1 + R2 = 0.05 = 100 For this ratio we can select value of R1 and R2 as 95K and 5K; or 19K and 1

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