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ADC12DJ3200: ADC12DJ3200:JMODE0模式采样幅度异常问题

Part Number: ADC12DJ3200

按照手册,进行JMODE0模式配置,采集10Mhz,0dBm单音信号,根据器件12bit分辨率,参考800Mv电压计算,采样的信号幅度应该接近满量程2048,但是我实际采样的信号幅度只有18左右,与理论差距32dBm,请问这是什么原因?