TINA/Spice/TLV272: Tina/Spice slew rate does not predict datasheet spec & typical perfomance

Steve Widener

Genius 11010 points

Part Number: TLV272
Other Parts Discussed in Thread: TINA-TI, TLV271, OPA192

Tool/software: TINA-TI or Spice Models

The datasheet for the TLV271 shows this step response & slew rate limit... (Figure 18)

When simulated in Tina-TI, the slew rate is about 5X slower:

Please verify. If the model is not correct, please update to better match the correct slew rate response.

over 7 years ago

0 John Miller - Sensing over 7 years ago

TI__Mastermind 40295 points

Steve,

Would you please attach your TINA slew rate test bench to this thread?

Thanks,
John

0 Steve Widener over 7 years ago in reply to John Miller - Sensing

TI__Genius 11010 points

Waveform attached

0 Steve Widener over 7 years ago in reply to Steve Widener

TI__Genius 11010 points

TLV271.docx

0 Steve Widener over 7 years ago in reply to Steve Widener

TI__Genius 11010 points

TLV271.TSC

0 John Miller - Sensing over 7 years ago in reply to Steve Widener

TI__Mastermind 40295 points

Steve,

The model has quite a bit less slew rate than quoted in the data sheet.
The root cause is that this is an old model.
Models in that time only covered some basic DC specs, and perhaps BW, unlike today's models which are much more comprehensive.

Please let me know if you have any more questions.

Regards,
John

0 Steve Widener over 7 years ago in reply to John Miller - Sensing

TI__Genius 11010 points

Thanks John

Would you point me to a similar device that has a better model

0 John Miller - Sensing over 7 years ago in reply to Steve Widener

TI__Mastermind 40295 points

Steve,
The product line apps engineers can give the best recommendation for a different device.
If you have no objection I will transfer this thread to the E2E Precision Amps forum.
Please let me know if this is okay.
Thanks,
John

0 Steve Widener over 7 years ago in reply to John Miller - Sensing

TI__Genius 11010 points

John -

Is there an easy way to tell if an op-amp model is of the older variety or if it is the more comprehensive version that you mention (other than running test simulations)?

Maybe a date range? The TLV27x was released in 2004, perhaps models developed after some particular date would be more accurate?

Steve

0 Steve Widener over 7 years ago in reply to Steve Widener

TI__Genius 11010 points

Correction - the TLV27x device was released in 2004, the spice models are dated 2011 in the product folder under tools/software

0 John Miller - Sensing over 7 years ago in reply to Steve Widener

TI__Mastermind 40295 points

Steve,
The best starting point is to work with the product teams supporting the E2E Precision Amps forum. They can help identify the devices with specs that meet your and have the best supporting models.
Regards,
John

0 Steve Widener over 7 years ago in reply to John Miller - Sensing

TI__Genius 11010 points

Ok - thanks for the support.
I checked and the OPA192 has good correlation between the datasheet slew rate and the simulation slew rate results.

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TINA/Spice/TLV272: Tina/Spice slew rate does not predict datasheet spec & typical perfomance