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Hello， sorry for your inconvenience that have caused to you , there is no THD+N parameter about DAC9881, and I have confirmed about this question and reply you as soon as possible.
About the THD+N of DAC9881, we tested EVM board and uses a REF5040 and a OPA350 to buffer the reference input. In both cases, the best THD+N that we were able to get is about -80dB THD+N.
In addition, for better THD+N performance, we would recommend our newer DAC91001 part.
