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ADC12DJ3200: 采样谐波很大

yongjun wang
Prodigy 70 points
Part Number: ADC12DJ3200

使用ADC12DJ3200自己开发的板子，2.4G采样率，JMODE3，16lane，双通道模式，输入264MHz，-1dBFS单频信号，信号源输出加了低通滤波器抑制谐波，采样分析谐波不到-50dBFS，和数据手册指标相差很大，下图是采样信号，请问这是什么原因导致的？数据手册347MHz，-1dBFS，HD2=-73dBFS