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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

Parents
  • Hi Kris 

    Thank you for you kind support everyday!

    Your data help us very much.

    So the data you attached is for AD8418? Or AD8418A?

    I'm asking this because you gave me the bias current VS Vcm graph and the result of Vcm was

    Vcm[V]    Ibias+[mA]     Ibias-[mA]
    0               -6.35E-03       -1.63E-03

    It look that Ibias+ is bigger than the result which you attached today.

    Best regards

    Kawa

Reply
  • Hi Kris 

    Thank you for you kind support everyday!

    Your data help us very much.

    So the data you attached is for AD8418? Or AD8418A?

    I'm asking this because you gave me the bias current VS Vcm graph and the result of Vcm was

    Vcm[V]    Ibias+[mA]     Ibias-[mA]
    0               -6.35E-03       -1.63E-03

    It look that Ibias+ is bigger than the result which you attached today.

    Best regards

    Kawa

Children
No Data