TheCircuitDogData Conversion
ADC Resolution and LSB Calculator
Calculate the ideal unipolar ADC step size and an approximate code for a particular input voltage.
Enter the values above and select Calculate result.
Formula
LSB width = Vref / 2ᴺ
Worked example
For 12 bits and 3.3 V reference, 3.3 / 4096 ≈ 0.806 mV per LSB. A 1.65 V input corresponds to approximately mid-scale.
Engineering notes
Check the actual ADC transfer function, coding mode and reference specification. This is not an ENOB, noise or INL calculation.
Always compare calculated values with the actual component datasheet, tolerance stack-up, operating temperature and circuit conditions before applying them to hardware.