OPA4192: Settling time and slew rate limit min and max

John Gray

Part Number: OPA4192
Other Parts Discussed in Thread: OPA192

Good Afternoon,

I'm wondering if someone can help me define the min and max of the settling times slew rate limits for the OPAx192 Op amps. There are typical shown but not the extremes.

We are using the amplifiers in a ADC circuit that we would like to know margins for our sampling times.

Thanks,

John Gray

10 months ago

+1 Art Kay 10 months ago

TI__Mastermind 18037 points

John,

+/-15% of the typical values on a device with this internal topology is what is the expected worst case variation of slew rate / settling time.

Best regards,

Art

0 John Gray 10 months ago in reply to Art Kay

Intellectual 310 points

Art, thank you. I wonder if there is a place in the OPA4192 model where I can adjust the slew rate?

-John

0 Art Kay 10 months ago in reply to John Gray

TI__Mastermind 18037 points

John,

I will ask our model expert if there is a simple way to adjust slew rate on the OPA192 model. This may take a little time.

There is a very simple generic model that you can use to adjust many different parameters like slew rate. Depending on your needs maybe this is sufficient. Tina provides this under semiconductors. If you click on the model, then click on be three dots near "type", you can edit the parameters.

Best regards,

Art

+1 Art Kay 10 months ago in reply to Art Kay

TI__Mastermind 18037 points

John,

Below is the modified model. Inside the model, you can update the X_U31 instance line for different slew rate. Specifically, IPOS and INEG values by +/-15% of given value of 2.4A. Note that this number affects DC clamping blocks for both V, and I.

opa192 mod slew rate.TSC

I hope this helps!

Best regards,

Art

0 John Gray 10 months ago in reply to Art Kay

Intellectual 310 points

Art,

I use Cadence Pspice software tools, so I didn't know where to use the .TSC file. Your explanation of where in the model to change the values allowed me to find it in the pspice lib files. I changed it and it worked. Thank you so much. I assume I can move the bandwidth around 15% to get small signal responses to change by 15%, I'll try that.

Have a great day!

-John Gray

0 Art Kay 10 months ago in reply to John Gray

TI__Mastermind 18037 points

Happy to help.

Best regards, Art

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OPA4192: Settling time and slew rate limit min and max