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AD7663模拟输入范围不满足设置需求

Question asked by liu_heu on Nov 6, 2017

AD7663ASTZ芯片模拟输入范围不满足要求。我们配置了模拟输入范围为±5V,可是通过测试发现模拟输入信号范围为±2.5V,当超过2.5V时,无法输出正确采样结果,电路配置如图。输入幅度2.5V正弦信号时,最大采样结果为31600,接近满量程。

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