Hi, dear product line engineer.
my customer use iNA333 to measure the voltage of 4-serial thermistor. the schematic as below. the current is 10uA, thermistor is 1k and Rg is 560-ohm. then the expected output of INA333 should be 1.796V. however, my customer said: all the output of INA333 is near 0V when he mount all 4-INA333. the output seems correct if he just mount U4 and U5 or U4 or U5. I checked the schematic and datasheet. seems customer's design meet specification of datasheet and no incorrect.
then I do a simulation. the result is the output of INA333(U5) meet my expect perfect if I remove U2,U3 and U4 and just keep U5. the exactly situation for U4. but U3(remove U2,U4,U5) and U2(remove U3,U4,U5) could not pass the simulation.
could you please help to figure out the root cause? thank you very much!
regards,
Bill