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F28335的ADC噪声



我的信号和F28335的ADC连接时会有噪声产生,和ADC断开后噪声就没了,是不是我的ADC坏掉了?我焊电路的时候由于虚焊导致有一次ADC输入了一个4V的信号,会不会把ADC的输入口损坏?