OPA227: Long Term Drift

Part Number: OPA227
Other Parts Discussed in Thread: OPA189

Hi all

My customer has a non-inverting amplifier with a gain=10 with the OPA227 and he asks about the long-term drift of the output voltage.

What value can they expect ?

... and would you rather suggest another OpAmp to achieve lower drift ?

This is to be used within a slow temperature control-loop, so OpAmp GBW can be small.

Best regards

Ueli

0 Michael Steffes over 4 years ago

Guru 48395 points

Morning Ueli,

You don't see a lot of actual measured Vos shift over long time periods - more common for references to show that,

The ones I have seen suggest that chopper amps do pretty well with very low (or actually more like test instrumentation) drift.

0 Ue over 4 years ago in reply to Michael Steffes

Hello Michael

Thank you for this comment, makes sense.

I also find this post on the topic

... and a training video covering long-term stability:

So I assume one should use a chopper OpAmp with very low offset and offset drift specification like the OPA189.

Best regards

Ueli

0 Michael Steffes over 4 years ago in reply to Ue

Guru 48395 points

Yes Ueli,

That OPA189 looks to be an extremely low drift option (over long time periods)

If you don't need that 36V capability, there are many 5V options out there as well. Those might operate with lower supply current.

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