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INA169: Asking for the recommendation on the INA169 design accuracy

Part Number: INA169

Hi Team,

Customer is using INA169 on new project.

 

Would you please provide your comment on the design accuracy on this circuit? How many percentage error it might be? 10%?

 

Here is customer’s schematic.

https://txn.box.com/s/mrkats4flq50qd7fxkxmo8b8nhi7jhlx

 

 

 

 

BR,

SHH

 

  • SHH,

    Based on the circuit you could have a larger error just based on the current draw required for U5301.  As the specification table for U5301 I saw could range from 3uA to 8uA.  According to the output at 3V you should have a current out of ≈55µA.  The 8uA would be larger than the 10% you required.  As far as the INA169 I would refer you to the INA169 Error Analysis to get an overall estimate of its accuracy.  This can be seen on the INA169 main product page.  You will need to add the resistors specification used for the Vsense (Rshunt) and the Rout resistor as well to you calculations.  

     

  • Hi Javier,
    thanks for feedback.
    What is the Rout resistor need to add in the INA169 Error Analysis?


    BR,
    SHH

  • Hello SHH,

    Rout needs to be added to the error analysis if you are measuring the output voltage.  The INA169 pushes a current out and this will create a voltage drop across Rout.  The Rout error will create a voltage error.  Also any leakage current needs to be accounted for like mentioned before.