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使用TMS320F28069FPZT采样口坏原因分析!

Other Parts Discussed in Thread: CONTROLSUITE, TMS320F28069F
TI工程师、高手们好:
                 我在使用TMS320F28069PZT(采样不带隔离)做变频器控制。试验测试时一切正常。运行几天后发现AD采样口坏,有几路采样口采不到值(电路上采样电压有)。其中有两路采样值不对,采样电压值是3.3V,采样值只有1677和1980.请帮忙分析下采样口坏的原因。谢谢!