Input Impedance of AD7865-2

Dear Sir, I'm using a AD7865-2, have some problem convertion results. There is a simple Low pass filter on the Vin of AD7865-2. But Resistor value is Zero  ohm, and Capacitor is 0.01uF. In this case, the conversion result is good. But in case of that resistor is 1k ohm, the conversion result is lower than that of zero resistor. What is the problem? Please let me know, if someone knows the reason for that. Thanks a lot.

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    •  Analog Employees 
    on Aug 24, 2018 12:50 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

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    EZ Admin
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    •  Analog Employees 
    on Aug 24, 2018 12:50 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
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