参考源用REF3020,和LM336-2.5都试过,所有通道接地读数有500+,上下跳动200+这样,可以怀疑AD坏了吗
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你好,请问采样率是多少?SAR ADC 一般要留有一定的时间给内部的电容充放电,如果是高速采样,一般要在基准后加一个运放缓冲,可以参照EVM的设计。http://www.ti.com/lit/ug/slau228/slau228.pdf
建议用示波器观察一下发出采集命令时,VREF引脚的波形。