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AFE4300: channel 2 input pin broken

Part Number: AFE4300

Tool/software:

Hello,

I have a problem with AFE4300. Below the external interface between the AFE4300 channel input pins and the electrode I'm using. 

  

Systematically we noticed that everytime a board comes back from a customer that says it's not working, the AFE4300 channel 2 input pin is broken. Only this pin, the other channels are good. Any idea about that? Do you know if there is an intrinsic weakness of that channel?

Thank you.

Best regards,

Antonio