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ADS7853: 这个输入到底是多少啊

Part Number: ADS7853
Other Parts Discussed in Thread: OPA836

运放一算,好像最终输入AINP的值不是VIN,是2FSR_ADC-VIN,这怎么控制啊

  • 您好,Vin-Vcm=Vcm-Vout

    因此Vout=2Vcm-Vin

    假如Vin为0~1V的正弦波输入,Vcm=2.5V,则Vout=5-Vin

    如果Vin是0~1V输入,则输出为4~5V输出,以4.5V为参考。

    这个电路图的目的是为了OPA836的输出满足ADC的输入,通过Vcm将VIN的信号抬高,OPA836的输出相位和Vin相位正好相反,因为是反相输入。仿真如下,可以看到以4.5V为参考。