ADC Signal-to-Noise Ratio and Distortion (SINAD)

The signal-to-noise ratio plus distortion (SINAD) is measured with a sinusoidal input near full-scale applied to the ADC. The SINAD is found by computing the ratio of the RMS level of the input signal to the RMS value of the root-sum-square of all noise and distortion components in the FFT analysis, excluding the DC components. The SINAD value is a useful measure of ADC performance because it includes the effect of all noise, distortion and harmonics introduced by the ADC. SINAD can be calculated with SNR and THD as given below.

(1)
$$SINAD = -10 ∙ log({10}^{-SNR/10} + {10}^{THD/10})$$

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