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Regarding Single-ended input to ADE7953

Category: Software
Product Number: ADE7953

I'm giving single-ended input of 50Hz to the evaluation board of ADE7953 at the voltage pin VP_IN and VN_IN with zero offsets with JP9A and JP8A closed. When I'm observing the applied signal at the test points, VP and VN (without connecting the VN_IN to Ground) using the oscilloscope the applied signal has a considerable amount of dc offset. What is the possible reason for this?

Thanks   

Satya Prakash Singh



Corrections
[edited by: satyaprakash at 6:19 AM (GMT -4) on 10 May 2022]
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  • The recommended configuration is to connect VN_IN to ground, if you do not then it leaves the input to float and therefore it impacts the measurement on the channel. That ground on the VN pin gives a nice, stable reference in order to give you a measurement without an offset.

    Although I will say that because the part has a high pass filter, the offset should not cause any issues with the internal calculations as long as the offset doesn't get so large that it causes clipping or distortion on the channel. 

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  • The recommended configuration is to connect VN_IN to ground, if you do not then it leaves the input to float and therefore it impacts the measurement on the channel. That ground on the VN pin gives a nice, stable reference in order to give you a measurement without an offset.

    Although I will say that because the part has a high pass filter, the offset should not cause any issues with the internal calculations as long as the offset doesn't get so large that it causes clipping or distortion on the channel. 

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