ina321

Bob Raines

Other Parts Discussed in Thread: INA321

The data sheet for the ina321 says that it turns on in microseconds from shutdown. Is there a spec for the turn on time or has it been measured?

over 9 years ago

0 Pete%20Semig over 9 years ago

TI__Mastermind 25795 points

Hello Bob,

Unfortunately we do not have the data you're requesting, though it is something that we are looking to add to future data sheets.

Given that the quiescent current of the device is 40uA (typical), we estimate that the turn on time would be at least a few hundred microseconds. The turn on time will be much greater than the time it takes to come out of shutdown since all internal nodes are completely discharged when power is removed.

0 Bob Raines over 9 years ago in reply to Pete%20Semig

Prodigy 50 points

Actually I was looking for the time to come out of shutdown. Sorry if I wasn't clear about that.

0 Pete%20Semig over 9 years ago in reply to Bob Raines

TI__Mastermind 25795 points

Hello Bob,

Thanks for the clarification. Let me look into this more and I will get back with you.

0 Pete%20Semig over 9 years ago in reply to Bob Raines

TI__Mastermind 25795 points

Hello Bob,

Thanks for your patience.

We measured a single unit in our lab under data sheet conditions (Vs=5V, Rload=10k, Vcm=Vref=2.5V) and obtained a measurement of 2us. Please be aware that this value will vary over a variety of parameters including process, temperature, and load. Therefore it's prudent to perform further testing of the device's performance in your system.

I hope this helps!

0 Bob Raines over 9 years ago in reply to Pete%20Semig

Prodigy 50 points

Thanks Pete. That is just what I needed to know.

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