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ADS1245的参考电压VREFP与VREFN如何输入?

Other Parts Discussed in Thread: MSP430F149, ADS1245

请问是不是按照手册上所写:Vref=1.25V是必须的呀?一般情况下,VREFP与VREFN是连接到什么输入的,例如ADS1245与MSP430F149共同使用时?