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ADS1258的一些问题

Other Parts Discussed in Thread: ADS1258

专家们好,ADS1258的单端输入也就是AIN0-AIN15这16个通道的最大输入电压是不是5V??我现在在使用ADS1258的时候,从12V的输入端串联了2个精密电阻,一个是3MΩ,一个是1MΩ,然后接地,从1MΩ和3MΩ连接的一端接线到ADS1258的单端输入,那理论上这个输入大概是3V左右,没有超过它的范围,但是我上电的时候ADS1258的输入端烧了,这是怎么回事呢??哪里有问题呢??请指教具体如图所示的电路。ADS1258的端口直接烧坏了。