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ADS8328两个通道采过来的数据都偏小,帮帮我

Other Parts Discussed in Thread: OPA2277, ADS8328, REF3120

ADS8328两个通道采过来的数据都偏小,前面输入信号没加跟随器,基准用的REF3120通过一个跟随器OPA2277接的。不知道什么问题,就是采过来的数据很稳定,就是比实际模拟电压值小。输入信号是用模拟电压源给的。