AD9767 SNR & ENOB

Hi,

In the AD9767(14 bits) datasheet, the figure 68 shows the SNR vs. clock placement.

The AD9763 is 10 bits, and AD9765 is 12 bits.

According to the ADC/DAC SNR formula, the SNR = 6.02*N + 1.72 dB.

From the figure 68, if fix the clock placement, I found the AD9767 has the worse SNR performance.

It is contrary to the formula!

Please help to explain this question, and provide the ENOB spec.

thanks,

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