OPA348: Settling time of OPA348

user4090349

Intellectual 811 points

Part Number: OPA348

Hello

I have a circuit of OPA348.

i do the simulation.

But when I do the test, the settling time is much longer than expected.

I wonder why for the difference

over 2 years ago

+1 kai klaas69 over 2 years ago

Guru 140200 points

Hi,

have you considered the impact of capacitive load on the settling time?

user_opa348.TSC

It's not recommended to run a micropower OPAmp as a comparator. TI has tons of brilliant low power comparators being designed for right this job

Kai

+1 Ron Michallick over 2 years ago

TI__Guru*** 149986 points

Hello user,

The waveforms are really small and blurry, so I can only can see the shapes, not the scales.

The first flat part of output is overload recovery time. The output was slammed against the negative supply rail, 0V. The op amp is not linear in beginning.

The rest of the time in the waveform is slew rate limited. You get the full slew rate for a while, then the input difference drops (below 100mV) and slew rate slows down.

[FAQ] Why does the slew rate in my application not match the op amp’s data sheet?

0 Caro Walter over 2 years ago in reply to Ron Michallick

TI__Mastermind 19327 points

Hello,

Was the issue resolved? I will mark Ron & Kai's answer as "TI Thinks Resolved," please confirm.
If the issue isn't resolved, please let us know so we may further assist.

All the best,
Carolina

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OPA348: Settling time of OPA348