Other Parts Discussed in Thread: INA220, INA228
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Hi Shekar,
your input voltage should at least be 100...1000 times higher than the input offset voltage of INA220 which is up to 50µV. But your minimum input voltage is only 100mA x 100µR = 10µV which is way too small.
Kai
Hi Shekar,
Kai is correct – the minimum voltage input this device can receive is determined by the percentage error that can be tolerated. An input voltage that is equal to Vos in magnitude will have an error that is at least 100%.
It is difficult to cover such a large current range with good accuracy. optimization/tradeoff is necessary.
You may also want to look into INA228, it is more accurate and will make your design job easier.
Regards, Guang