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关于ADS1675的差分驱动THS4503共模电压问题

Other Parts Discussed in Thread: THS4503, OPA140

请问一下,我实际前放最后一级是OPA140搭建的有源滤波,THS4503共模电压输入是2.5V电压,用8位半数字万用表实测了THS4503差分输出两端,一个共模电压是2.53V 一个是2.44V,请问是什么原因造成的?