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About dac SFDR - difference between output waves

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about dac SFDR

Hi guys:

i have designed a 12 bit current steering DAC, when i calculate the SFDR of the output waveform, the verity of the value is so much.
since the output wave is step by step, when i take 1 point at one step for DFT, the output SFDR is 70dB, but when i take 256 points at one step, the output SFDR is 50dB.

who can tell me the reson of the phenomenon, and which one is resonable.

thanks.
 

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