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XTR108的使用问题 输出电流不变



朋友们:

我也碰到 输出电流不变的问题,电阻桥的输出信号是2mv/v,  用XTR108的IREF 激励,IREF是V0,V1输出的。激励是有的4.8v,电阻桥连接的是是VI2, VI3 差分电压是8mV,  共模电压是2.5v, 但是却输出电流只有1.78mA 且不随输入信号改变;  求解决!!  感谢!