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1/2Vref
能不能提供一个:高精度的,用ADS1252作AD的,0-24V直流电压采集的原理图。(目前初步想用REF5025作参考,THS4521作单端转差分缓冲放大,加上ADS1252,用MCU切换光偶选择通道,不知能不能做到0.01%的精度)