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Does AD8422 suitable for shunt current measurement?

Question asked by JasonChien on Oct 19, 2016
Latest reply on Oct 20, 2016 by JasonChien

Dear Sir:

               I Would like used AD8422 to measure shunt current as below picture and I have some issue as below:

 

1. I used 3V and 30k ohm load to simulate 0.1mA current , but I measure 2.5265V from AD8422 Vout.

2. I used 3V and 3k ohm load to simulate 1mA current, but I measure 2.5359V from AD8422 Vout.

3. I used 3V and 300 ohm load to simulate 10mA current , but I measure 2.6290V from AD8422 vout.

 

This result have some gap with Estimated value((Ishunt x0.1x100)+2.5V) , What's wrong in this schematic? Does AD8422 suitable for shunt current measurement? BTW , If I want to measure uA current , Do you have suggest?

 

Note: 2.5V REF from ADR3525.

 

Best Regard

 

Jason

 

 

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