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.

SNR

Required number input.

Estimate the effective number of bits of a converter from a measured signal-to-noise ratio. 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]

Effective number of bits

The resulting effective number of bits returned as a number.

• ADC relationships often assume an ideal full-scale sine wave, uniform quantization, coherent sampling, and independently specified noise or jitter. Real ENOB, SNR, THD, SFDR, aperture uncertainty, reference noise, clock phase noise, input bandwidth, and coding conventions depend on the test setup and datasheet definition.
• 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.

• ENOB From SINAD

  Convert SINAD to effective number of bits as enobBits = (sinadDb - 1.76) / 6.02.

• Ideal ADC SNR

  Estimate ideal full-scale sine-wave signal-to-quantization-noise ratio as 6.02N+1.76 dB. Oversampling, thermal noise, distortion, and reduced input amplitude are not included.

• A-Weighted SNR dB

  Compute A-weighted signal-to-noise ratio snrADb = 20 * log10(signalVrms / noiseFloorVrms) + aWeightCorrectionDb, with the correction defaulting to zero.