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ADS1115: PGA与内部基准的逻辑关系

Part Number: ADS1115

Tool/software:

问题1:ADS1115的FSR最大可调为±6.144是怎么做到的?根据什么值进行的Gain增益得到的

问题2:如果内部基准电压为2.048V,可以采5V电压吗?

问题3:或者说内部基准电压是可调的?根据PGA寄存器来设定,FSR量程即是基准电压值?

烦请解惑,感谢!