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Noise caused by short circuit at the input end of AD7134

Category: Hardware
Product Number: CS-305674-W3X6V5

 When the input end of the AD7134 is connected to the ground, the output data is noisy with a fixed frequency,And the larger the input amplitude, the larger the noise amplitude。The AD7134 output data is as follows


  The noise is all in multiples of 285hz,There is no such noise in my circuit or in my lab. Where is it coming from?