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Yes, it is right that DNL and INL are static characteristics and SNR is dynamic one. Some times it expressed that INL = some of (DNL) while traversing from ICMR- to ICMR+ like a ramp input. These doesn't take care of frequency dependent errors. Thus static.
For SNR, the source of errors are many. As the name indicates it is ration of signal to noise power at the output of the ADC. But mind that the noise consists of variety of source. One of the major source is the quantisation noise. Thus, going by theory, for an Ideal ADC, SNR = 6.02N + 1.76 (dB).
Now, I don't agree with the above view that there is no relationship between INL/DNL and SNR. Because the DNL/INL is coming from quantisation error (may be shift of quantisation level, mismatch etc.). This certainly has to do with quantisation noise and thus SNR.
A second point coud be like this. If ENOb (calculated from SNR) of an ADC drops by , say, 2 bit from desired one; then the INL/DNL performance of the ADC is likely to be poor.
I would highly appreciate if any further clarification comes in this regard.