AD7810Y，采集到的数据偏低50左右的常数（data is about 50 lower than expected）

Question

图中上方为一路ad7741压频转换，下方为AD7810Y的测试电路，电路为电阻分压+TVL2211射随+AD7810Y+TL431提供2.5V基准电压+6N137+freescale单片机xs128读取数据。尝试过改变基准电压直接接电源等，还是找不出原因。另附上原理图（用于试验，可能有些杂乱，见谅）和实验数据，期待并感谢您的解答。THANK YOU!

EZAdministrator · Accepted Answer

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ADIApproved · Answer

您发送的原理图格式我们这边无法打开，请转成pdf的格式。 
 首先我们要排除硬件的原因，然后再看是否是软件导致的读取数据不准确。请确认一下您的结果中，输入信号的0，0.1V, 0.2V等是真正输入到AD7810的电压信号值。另外要检查电源以及参考源是否稳定。