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VIVADO的调试窗口IAL监测到AFE5816输出电压大了一倍问题



目前在调试AFE5816收发信号,我直接用信号发射器给AFE5816发送一个峰峰值是100mVpp,5Mhz的正弦波,使用固定增益模式(设置的增益值为10db),ADC寄存器设置为默认值,根据公式:20Log(输出/输入)=10db,计算的理论输出的峰峰值电压应该是316mVpp,但是用VIVADO的调试窗口IAL监测到输出正弦波的电压的峰峰值是620mvPP左右,大了1倍。这在设置哪里还需要注意什么呢?还请高手能教指导下,小白在此感谢!