不支持真差分输入,这款相当于单端输入,可以看到negative input命名的均为AIN_nGND。
并且对于模拟输入端的描述中也有提到:The ADS8684 and ADS8688 have either four or eight analog input channels, respectively, such that the positive
inputs AIN_nP (n = 0 to 3 or 7) are the single-ended analog inputs and…
手册有说: 例如 AIN_6GND
Analog input channel 6: negative input. Decouple with AIN_6P on pin 12. No connection for the ADS8684: this pin can be left floating or connected to AGND
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