Hi All! I need to design a high side current sensor thats able to measure 0-1A at 30V within an accuracy of 500uA and feed this value into an ADC of a microcontroller (6V input max) I intend to use a current sensing chip (This takes the guesswork of trying to figure out CMRR and CMVR due to resistor inaccuracies etc. for a custom instrumentational OP-AMP). The best current sensing chip I've found sofar for the application is the MAX4080 current sensing chip with a set gain of 60 from maxim with a 0.1ohm current sensing resistor. It has good Common Mode Rejection and the Common Mode Voltage range includes 0V - 30V. (Output: 1A = 6V ; 500uA = 0.03V) It has a gain accuracy of 0.1%. The required gain accuracy (As far as I can calculate) is 0.05% (0.05% of 1A is 500uA) and (As far as I can tell) this value is independant of the sense resistor used. Any suggestions on chips that are more accurate or perhaps a way I can go around this inaccuracy?