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CD4051B: output voltage is nonlinear

Part Number: CD4051B
Other Parts Discussed in Thread: TMUX4051, , CD74HCT4051

Hi, when CD4051BPWR is used for analog signal sampling, VCC power supply is 3.3V, when the output RL: 100K, it is found that the input and output voltage is nonlinear, and related to the input voltage,this deviation is up to 9%,the data is as follows:

Can you tell me what is causing this ,and what can I do to avoid this,thanks