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Burnout currents tolerance in AD7124-4

Question asked by KDV on Oct 4, 2016
Latest reply on Oct 6, 2016 by JellenieR

Good day!

I would like to consider the possibility of using the internal burnout current source (0.5uA) for measurement of the external resistor divider ratio with high resistance (up to 1MOhm) to provide a sort of self-diagnostic. Absolute accuracy of the burnout current (0.5uA) does not important, but I need to be sure that absolute voltage at the ADC inputs will be within the permitted range for buffered inputs (AVDD − 0.1V for GAIN = 1 with buffer enabled). So if the tolerance of lowest available current source (0.5uA) will be in +/-50% range it will be ok.


Can we be sure that the tolerance of the lowest available burnout current (0.5uA) is within the range +/-50% ?