AD73311 sampling noise problem

hi,

    I use ad73311 as analog-to-digital converter. the sampling data coupled severe noise. According to the sampling digital data, the max value of quantization noise is about 210 when the analog input pins connect to ground.

    however, I don't know the noise source. So I want to know the how to determine the source of the noise and the method to reduce the noise.

    best rerards,

wu

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