INA241A-Q1: Please review the schematic of INA241A-Q1

Chase Jeong

Mastermind 7555 points

Part Number: INA241A-Q1

Tool/software:

Dear TI experts,

My customer made their schematic using 3 INA241A-Q1s. Could you review it?

They will use one 2V reference voltage from buffer IC to each REF1 pins of 3 INA241A-Q1s.

Best regards,

Chase

24 days ago

0 Javier Contreras4 24 days ago

TI__Mastermind 32290 points

Hello Chase,

The inputs have 100Ω resistors that may cause some issues. You need to drop the resistance if accuracy is an issue. See these 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

For the REF pins being driven there is a load about 20µA so you need to account for the voltage drop on the resistors connected to REF. The value does vary a little with input voltage about 5uA to 10µA. So that would be and error of about 3mV at the expected output. I would drop that resistance and make sure the buffer IC will not have issues driving about 100µA for all the INA241.

https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1296055/ina241b-loading-of-reference-voltage-pin

https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/1354530/ina241a-reference-voltage-is-changing

INA241B: Loading of reference voltage pin

Regards,

Javier

Amplifiers

Amplifiers forum

INA241A-Q1: Please review the schematic of INA241A-Q1