AD8421

Question

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

FFigueroa · Accepted Answer

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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AD8421

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