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ADS1282的参考电压

你好,ADS差分输入时 +VREF 和 -VREF 必须都是+2.5V 和-2.5V 还是只需要保证+VREF 和 -VREF之间的电压差为5V就行了?像这种接法不会导致-VREF的电压不稳定吗?