Hi All,

I have two different current-shunt monitor IC to choose from below. I was thinking number 2 would be best to choose and more accurate, any ideas?

1. INA213AIDCKR --> Max Input Offset Voltage(mV) = 0.1/5V

2. INA215AIDCKT--> Max Input Offset Voltage(mV) = 0.06/5V

Thanks,
WJ

 

I assume the more accurate IC has a higher price.
Is that acceptable for your application?
If so, than that would be the one to use if you want a higher accuracy measurement.

 

Hi Crutschow,

Thanks for the reply. If price or acceptance is not an issue, which IC would you pick? #1. 0.1/5V or #2. 0.06/5V and why?
WJ

 

It's a question of tradeoffs. INA213 is lower gain, higher offset, would require a 50% larger current sense resistance to get the same output. Otherwise end result is about the same, the higher offset is about the same % of signal given equal output levels. But with the INA215 the sense resistor is smaller, you will have less power loss there, overall a more efficient design. At the same price I would go with the INA215, maybe even pay a little more for it if the (smaller?) sense resistor gets cheaper. Also, make sure the input common mode range will work for your application, be aware it could be chip supply voltage dependent.