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INA214-Q1: INA214 replacement with lower offset voltage

Part Number: INA214-Q1
Other Parts Discussed in Thread: INA228, INA214

Dear team,

My customer feedbacks that 100uV offset voltage is too large for them. They hope the offset voltage can be pV or nV level. Do we have such devices?

Thanks & Best Regards,

Sherry

  • Hello Sherry,

    I don't know of any amplifiers with offsets that low. The lowest for current sensing group is INA228 shown here with parameter search:

    https://www.ti.com/amplifier-circuit/current-sense/products.html#sort=p766max;asc

    Sincerely,

    Peter

  • Hi Peter,

    Thanks for your help!

    One more question, our INA214's max offset is ±60uV, which means some device is 60uV, and some device is -60uV, right? If one device is +60uV, then thsi device's offset will be always positive, and it is not possible to change to -60uV with aging and temperature changes, right?

    Thanks & Best Regards,

    Sherry

  • Hey Sherry,

    No problem. The input offset voltage will remain constant as long as device junction temperature remains constant, as well as, the input common mode (VCM), the supply (Vs) also remain constant.

    Every amplifier's input offset will change as temperature, Vcm, or Vs change due to Vos_drift, CMRR, and PSRR respectively. See datasheet specs.

    As for aging, this is harder. We do quality testing on the device to make sure they can withstand extreme temperature cycles that simulate aging. However, they are tested to make sure they still pass the final test specification after the temperature cycles, not necessarily, that the input offset returns back to its original value.

    It is best practice to always calibrate device offset every single power up.

    Sincerely,

    Peter