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ADS1259参考电压问题

Other Parts Discussed in Thread: ADS1259, OPA735

在使用ADS1259时碰到个很奇怪的问题,ads1259的参考电压我接入的是正负2.5V,测量时发现正参考是2.5,负电源是-0.8,请各位大侠看看,电路如下