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LMK00804B-Q1: 输出波形有干扰

Part Number: LMK00804B-Q1

请教个问题。我用这个芯片作为时钟扩展,一个芯片是输出3路3MHz,另一个芯片输出3路48Khz,发现在48KHz的输出波形上高电平有3MHz频率叠加(上升沿和下降沿都叠加上去了)。布线是按照芯片指导布的,两个芯片输出时钟走线在不同的层,想问下为什么会出现这种干扰?