LM50: The measured parameters are higher

user6350528

Part Number: LM50

In our measurement, we found that the voltage was too high at normal temperature. According to the specification, it was +/-3, but it was actually exceeded. Please help to confirm

over 1 year ago

0 Josh Wyatt over 1 year ago

TI__Guru* 91146 points

Dear Dora -

Here in this bench style measurement environment, it looks like you confirmed your circuit is working.

The circuit looks reasonable, and you might or might not need the capacitor on the output of the temperature sensor, but its a good placeholder in case you need that.

The math on the Rbias for your voltage reference worked out to 25k, you might think to redo the math on that, or at least double check it.

This is a +/-2ºC device and the devices (from the video), looks to be within that range, on the bench, and its hard to tell, but you may be getting close enough to the devices to heat them up to the levels that are indicated by the voltmeter. I think this is a good functional check, and is good in my opinion.

If you are looking for accuracy testing, for best results, we would recommend connecting these up to ADC + MCU and placing units in a chamber or oil bath to measure.