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ads1120evm在PGA使用的时候,因共模电压问题,如何测量??

Other Parts Discussed in Thread: ADS1120

测量手段:电流源产生电流,流过100微欧的电阻。用ads1120的输入端(A0-A3)接电阻两端,测量电压

测试软件配置:PGA使用

问1:共模电压怎么提供??PGA需要提供共模电压才能工作

问2:如何处理地??电流源没有地线引出,所以两个系统没法共地