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ADS131A02 AIN1P 采集的ADC值不准

Other Parts Discussed in Thread: ADS131A02

客户使用TI的ADC芯片ADS131A02,发现从AIN1P采到的ADC值不准,于是将AIN1P和VREF_2V5相连,发现也没法读出满量程的AD值,换算出来只有2.45V左右。请问有哪些可能性会造成这样的影响?

谢谢!