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ADS8558 模拟输入信号为正负5V之间时转换的数字结果是如何对应的？

bkn1860
Intellectual 430 points
Other Parts Discussed in Thread: ADS8558

RT，当输入负5V时转换结果是多少？正5V时是多少？

  • 0
    TI__Genius 9936 points

    请问你的基准源是多少。ADS8558可以选用两种基准，一种是2.5V,一种是3V.每种基准，又可以设置输入范围为+/- 2Vref 和+/- 4Vref。

    例如为其准为2.5V,选择 输入范围为+/- 2Vref。则最大可输入+/-5V的电压。输出code请参照dasheet的30页Table4.OutputDataFormat。其中负电压用补码表示。

  • 0 in reply to Wayne Xu
    TI__Genius 9936 points

    基准为2.5V,选择 输入范围为+/- 2Vref。当输入5V时，输出结果为07FF,当输入-5V时，输出结果为0800