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INA826放大倍数不足问题

Other Parts Discussed in Thread: INA826

您好,请问我使用INA826作为仪表放大器,通过3.3V单电源进行供电来检测库里特公司的压力传感器输出的差分信号

使用上图所示的原理图,在输入P_IN+-P_IN-=14.7mV时,输出仅为570mV,增益G=38.77,未能达到预期的增益,请问是什么地方设计有问题,感谢!