INA129-EP: What is the Thermal Tail Settling Behavior of this amplifier?

Ekam,

1. I think by "Thermal tail settling behavior" you are referring to the offset settling on power up.  Is this what you mean?
2. The thermal power-up characteristics of the device will depend on the load.  For minimal load, the offset of the device should settle in microseconds. 
3. A load step change in operation will cause self-heating of the device.  This will also cause a shift in offset which will take some number of microseconds to settle to.
4. This behavior is not characterized for most precision devices as the settling is in the microseconds and typically not a concern in most applications.
5. If you have a concern regarding this behavior you will have to give me more details regarding your specific conditions.

Best regards,

Art Kay

I don't think anyone has done true thermal tail characterization for many decades. it was a big deal in the early current feedback days and we (Comlinear) developed a system to measure it and producte log(time) plots - for instance, a relatively poor part (that I designed) is the CLC400, 

That shift over time is thermal tail as a delta power distribution in the output stage works its way (slowly) back to the input offset terms, 

Customers complained, so here is a perfect no thermal tail redesign by Ken Saller, the CLC402, And yes, this measured step is getting into <0.002% window in about 100nsec and never leaving it. 

Michael,

Thanks for the extra detail on the subject.  Very interesting!

Best regards, Art

Hi Michael,

you forgot to mention your article 

https://www.planetanalog.com/slew-limits-create-settling-time-issues-in-high-speed-amplifiers-the-signal-sped-up-insight-16/

Hi Ekam,

the settling time for 0.01% settling is specified in the datasheet which represents about 13bit precision.

Kai

Thanks Kai, I had actually forgotten about this one. 

Thanks Michael for the insight.

Thanks for the link to the article!