Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Full-scale voltage

Required number input.

Bits

Required integer input.

Calculate the least-significant-bit step size of an ADC from its full-scale voltage. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

LSB voltage

The resulting lsb voltage returned as a number.

• Ideal quantization-noise formulas assume a suitable full-scale signal, uniform quantizer, and error sufficiently uncorrelated with the input. Dither, overload, nonlinearity, coding, input distribution, oversampling, and bandwidth change actual noise and SNR.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• ADC LSB Voltage

  Calculate one ideal ADC code width as full-scale input span divided by 2^N. Full-scale span is the high-to-low range, not necessarily the reference voltage for every ADC topology.

• Magnetometer Resolution

  Estimate one ideal ADC code step in magnetic field from full-scale span and bit resolution; excludes sensor noise.

• ADC Quantization Error Bound

  Calculate the ideal rounding quantizer's maximum absolute error as half an ADC LSB. Assumes a uniform quantizer and input within the conversion range; offset, gain, and noise errors are excluded.