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ADS1299的评估版测试时 发现 ADC的Vref不是4.5?

Other Parts Discussed in Thread: ADS1299

在用ADS1299-FE评估版测试时 采用内部参考,双电源供电模式 ,-2.5-2.5,但是在测试的时候 VREFP是-2.45,并不是设计所说的4.5v? 在提供的LABview测试时总得不到想看到的结果,想请问一下是什么问题呢? 是10uF电容击穿了?