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ads1115采集1.05V时没有误差,采集1.8V时却又8mv的误差

Other Parts Discussed in Thread: ADS1115

RT,

1.8V用的是LM4132A-1.8做基准电压,ADC转化完是1.7926V

但是采集1.05V时,1mv的误差也没有

同样使用ADS1115的AIN0引脚,PGA是2.048,会是什么原因引起的,我的ADS1115电源引脚有接10UF和1UF的电容