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我要采样工频电压，电压值有正有负。那么AD1274的电压参考管脚VREFP接+2.5V，VREFN是接地还是接 -2.5V呢？
VREFN接模拟地，并且只能接地。请参考数据手册第4页表格的VOLTAGE REFERENCE INPUTS部分。
2.5V的参考电压下，ADC就可以接受 +/- 2.5V 的差模输入。
有正有负的工频电压可以通过前级运放调理到ADC的输入范围。
