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Harmonic performance of AD5546 DAC

Hi. I am AD5546 DAC for output 36 KHz Sine wave. I am using this in four quadrant mode with ADR03 reference in line with data sheet. I have conversion frequency of 1152 KHz. So 32 samples per cycle. But its harmonics performance is poor, just 30 dBc. Why it is so? Should there be any harmonic present??

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