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INA240-Q1: About calculation formula of VOS_CM

Noritomo Harukawa
Intellectual 990 points
Part Number: INA240-Q1

The customer is referring to Table3 on page 17 of the INA240-Q1 data sheet.
Here is the calculation formula of VOS_CM.

Q1.
What does '12 V' in this formula mean?

-Harukawa

  • 0
    TI__Mastermind 26710 points
    Noritomo,

    The 12V in the formula means that the testing conditions for Table 8.5 Electrical Characteristics had the common-mode voltage (Vcm) set at 12V. Offset induced by CMR is due to a change in Vcm so there needs to be a reference point. Since we tested the part at 12V and measured an initial input offset of 5uV, this is the reference point. CMRR was calculated by changing the Vcm from 12V to 80V and 12V to -4V and measuring the additional offset.

    Best Regards,
    Peter Iliya