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(AD8418A)Vout ≠ Vref

Hi !

I have a question about AD8418A.

This is my test circuit.

I measured the Output voltage but it is not Vref level.

=> I don't have AD8418A so I measured AD8418.

Why this happens?

Our customer said that  this won't happen when they are using AD8206

but I measured AD8206 at my Lab and same thing happened.

But the output voltage offset is smaller than AD8418.

I think that maybe the +IN pin leakage current is big 

Can you explain that why this happens?

Best regards

Kawa

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  • Hi Kris

    Thank you for your kindly support!!

    Your support help us very much.

    >Can you try shorting the inputs together and connecting to ground?

    I got it.

    I will try that.

    >Is the output accurate when you measure with a reference voltage?

    Sorry I couldn't understand what you said.

    Do you mean did i measured the output voltage with Voltmeter?

    For that , the answer is yes.

    Also I got some AD8418A samples from our customer which was failed at the mass-production line.

    So I will try the same thing.

    >Why does the design call for such a large shunt?

    At the real application, the will use 5mOhms.

    But at the mass-production test , they are using 220Ohms to limit the current.

     

    Best regards.

    Kawa

Reply
  • Hi Kris

    Thank you for your kindly support!!

    Your support help us very much.

    >Can you try shorting the inputs together and connecting to ground?

    I got it.

    I will try that.

    >Is the output accurate when you measure with a reference voltage?

    Sorry I couldn't understand what you said.

    Do you mean did i measured the output voltage with Voltmeter?

    For that , the answer is yes.

    Also I got some AD8418A samples from our customer which was failed at the mass-production line.

    So I will try the same thing.

    >Why does the design call for such a large shunt?

    At the real application, the will use 5mOhms.

    But at the mass-production test , they are using 220Ohms to limit the current.

     

    Best regards.

    Kawa

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