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DAC39J82: DAC39J82 2X interpolation signal error

Part Number: DAC39J82
Other Parts Discussed in Thread: LMK04828

this is use 2x interpolation generate frequency spectrum:


this is use 1x interpolation generate frequency spectrum:

Why are they so different? How do I set up the register so that the frequency spectrum can be normal for 2x interpolation? how to use fir0 filter?