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Why does the AD9540 require special filtering on its analog output. What are the requirements of this filter?

April 26, 2017AD9540 analog filter filtering output require requirements special

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Why does the AD9540 require special filtering on its analog output. What are the requirements of this filter?

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To use a DDS-based device as a clock driver, the output sinewave must be converted to a rectangular wave with fast edge transitions (high slew rate). In order to do this, it is necessary to pass the AC output signal through a high- speed comparator, with an output of the correct voltage level.