OPA2891: Propagation delay

Abhi

Prodigy 60 points

Part Number: OPA2891

Here the propagation delay is not mentioned. Can I estimate the delay? I want to know the delay theoretically.

3 months ago

0 Ignacio Vazquez Lam1 3 months ago

TI__Mastermind 23220 points

Hi,

Amplifier data sheets do not discuss propagation delay because the term is generally used for comparators. The time from input to output of an amplifier would consist of the actual time the signal takes to travel through the op amp, and delay due to slew rate limiting as well as any overload recovery if the output is slammed. This information is not highlighted in a datasheet as it simply does not apply like it would for a comparator.

Best Regards,

Ignacio

0 Abhi 3 months ago in reply to Ignacio Vazquez Lam1

Prodigy 60 points

Can I estimate it somehow. I need the propagation delay for some purposes.

0 Ignacio Vazquez Lam1 3 months ago in reply to Abhi

TI__Mastermind 23220 points

Hi,

Are you using the device as a comparator? Or is it in a standard closed loop configuration?

Best Regards,

Ignacio

0 Abhi 3 months ago in reply to Ignacio Vazquez Lam1

Prodigy 60 points

I am using it as a buffer amplifier

0 Ignacio Vazquez Lam1 3 months ago in reply to Abhi

TI__Mastermind 23220 points

Hi,

I believe the majority of your delay would be from the rise time/ slew rate of the device which is specified in the datasheet. You could consider the time delay caused by the amplifier as it starts running out of bandwidth as well. I attached a snippet of a Precision Labs video that covers bandwidth and how limitations in bandwidth affect a signal seen at the output. I hope this helps.

Best Regards,

Ignacio

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OPA2891: Propagation delay