INA241B: The internal resistor value

Harry Ma

Intellectual 2875 points

Part Number: INA241B

Tool/software:

Team

May I know these 6 internal resistors' value ?

10 months ago

0 Javier Contreras4 10 months ago

TI__Mastermind 34560 points

Hello Harry,

This is not exactly the device but more of a representation of what is going on. The ref resistors are in the datasheet. I would look at the IB curves for the input impedance. Why do you need the information maybe I can answer the root question or need for this information.

Regards,

Javier

0 Harry Ma 10 months ago in reply to Javier Contreras4

TI__Intellectual 2875 points

Javier

Thanks for your support! Customer thinks the resistor in series will impact the gain of this circuit, they want to add a compensation in SW for calculation, that is why customer want to this value.

0 Javier Contreras4 10 months ago in reply to Harry Ma

TI__Mastermind 34560 points

Hello Harry,

See this post: https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1459493/ina241a-do-you-have-the-formula-for-calculating-gain-error-factor-for-ina-241

0 Harry Ma 10 months ago in reply to Javier Contreras4

TI__Intellectual 2875 points

Javier

Can you help to simulate the INA241A3 output when Rs=1k, ideal vout=2.1V?

0 Javier Contreras4 10 months ago in reply to Harry Ma

TI__Mastermind 34560 points

Hello Harry.

Please take note about the variation discussed in the other post and this document: https://www.ti.com/lit/ug/slya042/slya042.pdf

The screenshot above already has that. Which is -28.75%. (2.85-4)/4 = -28.75%. The one below is slightly different do to offset but basically the same thing. (1.5-2.1)/2.1 = -28.57%

Amplifiers

Amplifiers forum

INA241B: The internal resistor value