Stability of output of opa333 against changing temperature

SUCHITRA BHIDE

Other Parts Discussed in Thread: OPA333

I have interfaced OPA333 directly to a full bridge load cell. I have added a small positive voltage at the negative terminal of the opamp to keep the o/p voltage within 500 mv.

Now when I vary the temperature from 24 degree centigrade to 60 degrees what I observe is the output of opamp changes. Following are the observed results.

25 degrees 510 mv

35 degrees 498 mv

45 degrees 508 mv

55 degrees 508 mv

As observed the output changes from 25 degrees to 45 degrees is this expected.

Kind regards

Suchitra

over 14 years ago

0 G Hann over 14 years ago

TI__Prodigy 560 points

Suchitra,

I am not clear on the biasing that you are using for your full bridge, but you can definitely expect non-linearities over temperature associated with the bridge itself. A good starting point to determine if the shift you are seeing is due to the sensor versus the circuit you have designed is to simulate with an ideal bridge in TINA-TI. In fact, there are a number of sample circuits that you can start with.

All the best,

Gina

0 SUCHITRA BHIDE over 14 years ago in reply to G Hann

Prodigy 230 points

By biasing I understand excitation voltage. I am using one of the output port as the excitation voltage.

kind Regards

Suchitra

0 zidane over 14 years ago in reply to SUCHITRA BHIDE

Prodigy 80 points

what is the load seen by the output?

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Stability of output of opa333 against changing temperature