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PGA411-Q1: When the PGA411-Q1 resolves the motor speed, there is a fluctuation in the speed.

Part Number: PGA411-Q1

Hello, expert, I would like to inquire about the technical issues related to  PGA411-Q1 ,when decoding the motor speed, the decoding speed is always unstable, and there are irregular fluctuations, and the fluctuation is obvious. AOUT pin is output monitoring, there are also obvious fluctuations, The picture below can explainregarding the above questions, I want to know how to eliminate the fluctuations. looking forward to your answer, thank you!