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ADS1258 单电源供电采样单端信号ADCINN ADCINP 和参考电源接法问题?

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ADS1258 单电源供电采样单端信号ADCINN ADCINP 和参考电源接法问题?单电源供电

我只有单端信号,MUXOUTN,MUXOUTP要怎么接到ADCINN ADCINP? 可以不通过运放变成差分吗? 可以吧反向直接接地吗?参考电源你的反向也直接接地吗?

  • 您好,ADCIN单端输入电压范围和参考电压单端输入电压范围一样,都是(AVSS – 100mV) ~AVDD + 100mV)。
    那么不用的另一端,可以直接接地,也可以接共模电压,或者接参考电压都可以,datasheet中有描述:
    For single-ended measurements use AIN0 through AIN15 as single-ended inputs and AINCOM is the shared common input among them. Note: AINCOM does not need to be at ground potential. For example, AINCOM can be tied to VREFP or VREFN; or any potential between (AVSS – 100mV) and (AVDD + 100mV).
  • 那就是ADCIN P可以接地了?
  • 可以,因为每个输入端的电压范围(AVSS – 100mV) ~AVDD + 100mV), 如果单电源供电,那么每个输入端电压范围为-0.1V~AVDD+0.1V。所以接地也是没问题的。