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Original question:

INA149: Distribution Data for CMRR

TLV522: Distribution Data for CMRR

Shinichi Inoue
Guru 19701 points
Part Number: TLV522

Dear Specialists,

My customer'd like to know the distribution of CMRR and PSRR regarding TLV522.

I would be grateful if you could advise.

---

(1) Typical data(PSRR 109dB and CMRR 90dB) cover one standard delta, is it correct?

(2) Minimum data (CMRR 62dB) cover three standard delta, is it correct?

---

I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    TI__Guru 50016 points
    Hello Shinichi,

    The TI standard is that the Typical is one sigma, and the Limits are three sigmas.

    The actual distributions are considered proprietary information and require an NDA to disclose.

    The limits are tested, so there should not be any devices greater than the limit.

    These are devices from the National Semiconductor days, and National had different sigma limits. I am double-checking.
  • 0
    TI__Mastermind 23425 points
    Shinichi-san
    The typical value for CMRR and PSRR are not 1 standard deviation as you suggested. They are actually the average of the distribution. 1 standard deviation is used for pure offset measurements typically since the average is generally zero and would not provide much meaning. In most other measurements, the average is used as the typical. How we set limits is a bit confidential, but I can tell you that the min limits for CMRR and PSRR are more than 3 sigma. Since some parts have exceptionally good PSRR and CMRR, the spread extends very high but we warranty that they will not receive any devices that drop below the minimum.
    Chuck
  • 0 in reply to Chuck Sins
    Guru 19701 points
    Hi Paul and Chuck,

    Thank you for your reply.

    Actually, the customer'd like to obtain the distribution of CMRR and PSRR, but it's difficult I think.

    Instead, could you please inform one sigma, and then he can estimate.

    I appreciate your great help.

    Best regards,
    Shinichi