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INA282: CMRR Frequency Response up to 1MHz

Ting Ye
Genius 11800 points
Part Number: INA282

Dear Team,

May I know if you could share INA282 CMRR Frequency Response up to 1MHz? In datasheet, it only shows to 100kHz.

For instance, at frequency 350kHz, what the CMRR is?

Thank you.

Regards,

Ting

  • 0
    TI__Mastermind 20285 points

    Dear Ting,

    I am reaching out to design to see if we have this information available for you. I'll follow up with you soon.

    Carolus

  • 0 in reply to Carolus Andrews
    TI__Mastermind 20285 points
    Dear Ting,

    I have reached out to design, and unfortunately we do not characterize the INA282 beyond 100kHz for CMRR. The effective bandwidth for the lowest gain setting of the part is 10kHz, so we characterize an additional decade beyond this point to show the effects of CMRR, but it is my opinion they do not go beyond this due to the fact that the gain of the part is sufficiently reduced such that it is unusable beyond this point.

    If I may ask, why are you concerned with the common mode at high frequency?
  • 0 in reply to Carolus Andrews
    TI__Genius 11800 points

    Hello Carolus,

    Thank  you for the prompt reply.

    I tested it and found INA282 has good CMRR even at high frequency > 500kHz.

    Customer uses INA282 as high side current sensing and the monitored Vbus is not clean. 

    Thank you.

    Regards,

    Ting