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OPA322: OPA322 Temperature Dependency

Richard Elmquist
Mastermind 45250 points

Part Number: OPA322

Can you answer the following questions that my customer posed to me:

Could you provide additional information of the OPA322 temperature dependency like “temperature vs. Impedance” or “temperature vs. gain”.

I did not see any graphs that showed this, and I was wondering if we might have any. The impedance referred to in the first part is the output impedance.

Thanks for your help with this!

Richard Elmquist

  • 0
    TI__Mastermind 30600 points
    Hi Richard,

    For the request on gain vs temperature, the OPA322 datasheet does show open loop gain vs temperature in Figure 2 of the datasheet. Hopefully that is the information he is looking for.

    For output impedance vs temperature, it is reasonable to expect that in a worst-case type scenario that you'll see large variations across temperature, with higher temperature generally leading to higher output impedance. A good rule of thumb might be ±30% or ±50% to cover the worst-case across devices.

    Here is a blog that discusses this topic which might help explain some of the temperature dependence:
    industrial.embedded-computing.com/.../

    Best,
    Paul
  • 0 in reply to Paul Goedeke
    TI__Mastermind 45250 points
    Paul,
    Thanks for your help with this!
    I will let you know if the customer has any further questions.
    Have a great day.
    Richard Elmquist