Other Parts Discussed in Thread: TLE2064, INA141, INA826,
We are using the INA2141U as a differential amplifier in a test system. The test limits for different load configurations are 36.4uA +/- 20% and 3.6uA +/- 50%. I am trying to understand why we allow such a large tolerance when the voltage out of the TLE2064 is controlled to +/- 1% and the load resistance tolerance is +/- 1%.
What are the input offset voltage characteristics for the INA2141U? Could this be the reason for the wide specifications? Do you have any articles explaining how the INA2141U output varies from ideal and what are the causes of the variation? Ideally, with I_LOAD = 3.6uA the voltage at the input to the INA2141U is 144.7uV. The output of the INA2141U should be 1.447mV. With a tolerance of +/- 50%, we allow the voltage on Test Point J68 to vary from 1.447mV +/- 50%. I am trying to understand why.
The purpose of the circuit is to measure leakage current. In normal operating conditions I_LOAD could be 30mA so the voltage at J68 could reach 12.06V.INA2141 Circuit.pdf
