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DAC38RF89: The sum is I*cosω-Q*sinω or I*cosω+Q*sinω?

Part Number: DAC38RF89

Hi,

The configuration of DAC38RF89 is as described in section 8.3.16 of the data sheet. The phase of the NCO in Q-channel is set to 90 degrees.

I want to know after the summation,the resault is (I*cosω-Q*sinω) or (I*cosω+Q*sinω)?