Signal to noise and distortion (SINAD) is a combination of SNR and THD parameters. It is defined as the ratio of the RMS value of the signal amplitude to the RMS value of all other spectral components, including harmonics, but excluding DC. For representing the overall dynamic performance of an ADC, SINAD is a good choice since it includes both the noise and distortion components.
SINAD can be calculated with SNR and THD by
Note: In practical applications, to
achieve better performance, the SINAD value of an ADC should be higher.