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Since IQ effectively adds to the true IOUT, IOUT should be as low as the accuracy that the application can tolerate. Hence, if an accuracy of 10% is required, IOUT cannot be less than 40µA.  Since the ZXCT1009 has a worst case basic accuracy of ±2.5%, any other errors will be cumulative to this basic accuracy. This means to guarantee an accuracy of 10%, IOUT should be computed for a 7.5% error. Therefore, IOUT will have to be a minimum of 53.3µA. Round this up to 54µA. In the example shown here, the actual IOUT is 500µA, eliminating the concern about the effect of IOUT on accuracy.

PTM Published on: 2011-10-27