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ADS8556输入信号超过2.5V则转换的值就变成了4000多。

Other Parts Discussed in Thread: ADS8556, REF5025

如题,ADS8556的原理图如下所示,采用的硬件模式,主控是FPGA,外接的2.5V基准源,使用的是2REF的输入范围。现在是输入信号在0-2.5V以内增长,则转换数据相应的增加,大概会到16700左右。但是超过2.5V以后转换的值会突然跳到4000多,2.5V往上走,转换数据会从4000多往上增加。这是什么问题?