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AD8421

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Product Number: AD8421

Hello,

I would like to some advice to correct the ofsset for the AOP AD8421 :

  

I can found the value about -60.4 mV to have an output without offset. But how to do it with components, after the DataSheet I can see this electronic assembly :

But How to find the resistors ? Do you have an idea ? Thank you for your helps

Regard

Yann DO



Offset correction
[edited by: 206_RC at 2:55 PM (GMT -4) on 24 Aug 2022]
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  • Hi Yann,

    Good day! I apologize if we missed this post.

    You may use the reference pin to have a precise offset to the output voltage. Using a buffer opamp with voltage divider on the input to control the voltage. The use of the opamp is to have a low source impedance for the reference pin.

    To find the resistor value, you may just use the voltage divider equation. Vref = Vsupply [R2/(R1+R2)].

    I hope this helps.

    Best regards,

    Franz

Reply
  • Hi Yann,

    Good day! I apologize if we missed this post.

    You may use the reference pin to have a precise offset to the output voltage. Using a buffer opamp with voltage divider on the input to control the voltage. The use of the opamp is to have a low source impedance for the reference pin.

    To find the resistor value, you may just use the voltage divider equation. Vref = Vsupply [R2/(R1+R2)].

    I hope this helps.

    Best regards,

    Franz

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