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ADS1278: 请问ADS1278的参考电压Vrefp最大可以为5V吗

Part Number: ADS1278

请问ADS1278的参考电压Vrefp最大可以为5V吗,这边设计的电路Vrefn=gnd,Vrefp = 5V;并且发现每次DRDY的转换周期都会短于24个数据被读出的时间,导致总有数据被冲掉,后面采到的几位数据几乎都是新的转换数据的前几位,不知道这样表达的清不清楚。。