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DAC3282: DAC3282 output is oscillating above 20 Mhz

Part Number: DAC3282

I am  trying to increase the frequency of the signal at the input side of DAC3282 . Our  output is OK upto 15MHz. However, when i reach 20MHz the output of DAC3282  the amplitude is oscillating.What should i do? My DACCLK frequency is 80 Mhz .