Hi Everyone,
I am planning to use ADS8881 to perform current sensing. (Sensing the diff voltage cross the precision resistor).
The idea to replace the R in the below circuit with a programmable resistor to generate a programmable bias current (1uA to 1mA)
However, due to the accuracy of the programmable resistor, I have no way of getting a error less than 3% .
My idea to have a precision resistor before the load and sense the current with a ADC (ADS8881) and adjust the programmable resistor with that feedback.. Let us say the precision resistor is 1kOhm.
The voltage cross the resistor will be 1mV to 1V, (bias current 1uA to 1mA).
Will be realistic to expect ADS8881 be able to sense as low as 1mV voltage difference?
Thanks a lot for the help,
Eddy