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DAC8740H: DAC8740H工作几分钟后损坏

Part Number: DAC8740H
Other Parts Discussed in Thread: DAC8750,

求大神指导,DAC8740H配合DAC8750使用,刚开始hart功能正常,连续工作几分钟后,DAC8740损坏,电源和地之间的电阻由K欧级别降为1.2欧姆左右,不明就里