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ADS127L11: 该adc芯片的前端输入单端转差分这样做可以吗

Part Number: ADS127L11
Other Parts Discussed in Thread: INA821

ADC配置里面的输入buff使能。配置80Hz

1、图中A点断开并接地,读取数据看起来应该是正常的,没有太大的波动。

2、A点正常连接。B、C点短接并接地,读取数据,发现数据有规律性的波动

很奇怪是不是INA821的用法不太对啊,一接入这个INA821ADC的数据就容易有规律性的波动

还是说单端转差分的方法不合适啊