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INA333放大问题,使用外部电阻不可以输出预期电压

Other Parts Discussed in Thread: INA333

我使用INA333放大器作为我的电路中放大器,根据规格书放大倍数G=1+(100K/Rg);我用100k、47k、15k电阻分别接在了第1和8脚之间,电源是3.3v,REF脚接1.25V,我输入了0.246v电压,在Rg=15k时,输出是0.444v(这是相对于1.25v的电压),不知其故,望TI工程师予以解答。谢谢!