INA240: Input Impedance

Hao Wang14

Expert 4415 points

Part Number: INA240

Hi Team,

May I know the input impedance of INA240A1? Because I cannot find it in the datasheet.

Thanks and Best Regards!

Hao

over 6 years ago

0 Guang Zhou over 6 years ago

TI__Mastermind 36030 points

Hi Hao,

The differential input resistance is nominally 6.8KOhm; the differential input resistance is nominally 500KOhm.

Please click "this resolved my issue button" to confirm if this resolves your question.

Regards, Guang

0 Guang Zhou over 6 years ago in reply to Guang Zhou

TI__Mastermind 36030 points

It should have been "...the common mode input resistance is nominally 500KOhm"

0 Hao Wang14 over 6 years ago in reply to Guang Zhou

TI__Expert 4415 points

Hi Guang,

For most of the current sensing amplifier, the common mode input resistance is nominally 500kOhm. However, INA240 has PWM rejection circuit before the internal differential amplifier. Is the common mode input resistance still 500kOhm?

Thanks and Best Regards!

Hao

0 Guang Zhou over 6 years ago in reply to Hao Wang14

TI__Mastermind 36030 points

Hi Hao,

Yes, it is. The PWM reject circuity and the resistor network are independent from each other.

Regards, Guang

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INA240: Input Impedance