INA241A: The output jitter inquire

cayden liu

Part Number: INA241A

Tool/software:

Hi TI,

I use INA241A to sample servo current. We found that the output of the INA241 was not stable enough, but we did not see the fluctuation range of the output in the datasheet.

We read multiple sets of data with the F28P65 16-bit ADC and found that the sample values would be unstable once INA241A introduced. Data as shown below table:

0923_yoda.xlsx

Caes1: Capture 3.3V power supply on the F28P65 EVM

Case2: Use the F28P65 to capture the 3.3V power supply on the servo drive board that is not connected to the INA241

Case3: Use the F28P65 to capture the 3.3V power supply on the servo drive board connected with the INA241

Would you like share me the spce of INA241A output fluctuation range?

Cayden

over 1 year ago

0 Javier Contreras4 over 1 year ago

TI__Mastermind 32610 points

Hello Cayden,

Can you please share a schematic or block diagram of what you are measuring? From the data I would say there is an offset. How are you connecting to the ADC would also be helpful.

This is not information to help debug. Please provide enough details so that we can determine what the source of error could be.

Regards,

Jaiver

0 cayden liu over 1 year ago in reply to Javier Contreras4

TI__Intellectual 1276 points

Hi Javier,

Ok.

INA241A output fluctuation range is what we need. Please provide this spec.

Cayden

0 Javier Contreras4 over 1 year ago in reply to cayden liu

TI__Mastermind 32610 points

Hello Cayden,

Please provide me an example of "output fluctuation" on another device. I have never heard of a specification like this. From the little clues you gave me I don't think this is the root cause as your ADC numbers change a lot.

Regards,

Javier

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INA241A: The output jitter inquire