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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 support every day.

    Our customer are using AD8206 at the same application which is already mass-production past.

    So if you have AD8206's Vcom VS Ibias+ Ibias- can you share that?

    You send me AD8418A Vcom VS Ibias + Ibias- by e-mail few month ago so if it is difficult to up to this session, e-mail is OK.

    I tried to measure this at my Lab but my equipment is not good enough so I failed to measure uA level.

    Best regards.

    Kawa

Reply
  • Hi Kris.


    Thank you for your support every day.

    Our customer are using AD8206 at the same application which is already mass-production past.

    So if you have AD8206's Vcom VS Ibias+ Ibias- can you share that?

    You send me AD8418A Vcom VS Ibias + Ibias- by e-mail few month ago so if it is difficult to up to this session, e-mail is OK.

    I tried to measure this at my Lab but my equipment is not good enough so I failed to measure uA level.

    Best regards.

    Kawa

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