Equivalent Input noise current for TL97x Op-Amps

Martin Risso

Intellectual 470 points

Hi,

I can't find the equivalent input noise current spec in the TL97x data sheet. Does anybody know what it is?

over 7 years ago

0 Ron Michallick over 7 years ago

TI__Guru*** 145196 points

Martin,

I will dig through some databases on Friday to find it.

0 Ron Michallick over 7 years ago

TI__Guru*** 145196 points

Martin,

I did verify that noise voltage for typical samples were 4nV/rtHz at 1kHz.
I did not find input current noise. I can say that the effect of input current noise can be reduced by having equal impedance on both input pins.
This will cancel the noise from the shared current source..

0 Martin Risso over 7 years ago in reply to Ron Michallick

Intellectual 470 points

Hi Ron,

What is the next step to finding this specification? This is obviously marketed as an audio op-amp. And when doing noise calculations, this is an important specification.

Marty

0 Ron Michallick over 7 years ago in reply to Martin Risso

TI__Guru*** 145196 points

Martin,

I agree that input current noise is a needed addition to the data sheet. I will talk with product engineering to see if they want to add this specification. It will almost certainly be a typical number that is added.

I will ask for initial data by the end of next week.

0 Ron Michallick over 7 years ago in reply to Ron Michallick

TI__Guru*** 145196 points

Martin,

Here is the typical current noise data for TL97X

Amplifiers

Amplifiers forum

Equivalent Input noise current for TL97x Op-Amps