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AD9834 square waveform output


I need to output the square waveform output from AD9834.

The AD9834 datasheet mentions to connect this comparator to the SIGN BIT OUT pin after filtering the sinusoidal output from the DAC.

The MSB from the NCO can be output from the SIGN BIT OUT pin and it is useful as a coarse clock source.

Which is More accurate? 

Why does MSB from the NCO is coares? 

Best regards


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