INA597: Input resistance

richard armitage

Prodigy 60 points

Part Number: INA597

What range for the nominal Zic 9KOhm input resistance?

23 days ago

0 Taylor Allan 23 days ago

TI__Intellectual 1880 points

Hi Richard,

Are you asking for the standard deviation/variance or min/max values? I believe the variation is +/-15%, but I can get confirmation on this. Let me know if you are asking for something else, and I am happy to help.

Best Regards,

Taylor Allan

0 richard armitage 23 days ago

Prodigy 60 points

Thank you Taylor,

Yes that is the data I am interested in.

More than I expected, but I assumed the resistors are trimmed for best CMRR and gain error.

Conformation would be nice, its for F1 racing.

Cheers Rich A

0 Taylor Allan 23 days ago in reply to richard armitage

TI__Intellectual 1880 points

Hi Richard,

That is correct, the resistors are trimmed ratiometrically to achieve the best CMRR/gain error as possible. There is much more deviation for absolute resistance. Are you worried about the absolute impedance because you are planning on using input filtering?

Best Regards,

Taylor Allan

0 richard armitage 22 days ago in reply to Taylor Allan

Prodigy 60 points

I am using the INA597 to buffer the current signal from the wonderful DRV8145, thus the ~9K disturbs RIPROPI.

Thanks again Taylor

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INA597: Input resistance