请TI的专家们看一看,电压转换在3.67V以下转换正常,但是输入模拟电压超过3.67V的话,转换结果始终为3.67V左右,这是什么原因呢?ADS1256芯片的输入范围不是0~5V的吗?
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Hi
参考电压是2.5V,模拟输入范围就是+/-5V/PGA, 注意PGA的设置。
Hi
确认AVDD,最好是用示波器。同时最好把AVDD 5V电压设置略微高一点,不要低于5V.