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请教一下关于ads1158输出数据的问题

Other Parts Discussed in Thread: ADS1158

用ads1158的差分输入功能,参考电压正负2.5V,在差分通道加上差分信号后,读出的数据会随差分信号的大小变化。但是最大的输出数据大概是19200(十进制),此时差分电压约为3.3v。离理论最大值65536差太多。还有就是信号的正负怎么判断的,实际输出的代码中没有它的理想输出代码。