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ADS1274: 差分adc量程是正负2.5v,负电压为补码输出,是如何测量得出的?

Part Number: ADS1274

上图为adc测量流程图,采样电容为9PF,采样完是如何量化的?当VIN+电压小于VIN-电压,为什么可以测出是负值?不太明白