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ADS1274量程问题，当输入超过了它的最大量程时，转换结果不是保持在最大值，而是反向了，比如我输入了正2V，超过了它的正向电压最大1.25V，超过的部分输入了负的0.75V，这是怎么回事？
VREFP 和VREFN分别是２.５和０V，原理图是按手册实例画的的 ，只要是超过了量程Output Code是随机不可控的。
