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# TLV9001: max value of each spec

Part Number: TLV9001
Other Parts Discussed in Thread: OPA2991, , TLV9002

Hello Support team,

Customer need the following spec on datasheet, could you support?

* Max value of Input offset current

* Max value of input bias current

They don't need to guarantee it, but, they need these information as reference.

And they need input bias current VS temperature curve, too.

Thanks,

Koji Ikeda

• Koji,

The best resource for this would be section on statistics in the OPA2991 datasheet. We do not test max input offset current or input bias current, so the best approximation is to extrapolate from the typical value.

https://www.ti.com/lit/ds/symlink/opa2991.pdf Please see section 7.3.9 in the datasheet, that specifies what amount of guardband should be allowed based on the number of units produced.

Best,
Jerry

• Hello Jerry-san,

Thank you for your support. But, I don't catch your answer well. I think that TLV9001 and OPA2991 are quite different parts, can TLV9001 reuse OPA2991 spec?

Thanks,

Koji Ikeda

• Hello Ikeda-san,

Please leverage the electrical characteristics table from the TLV9001 datasheet along with the statistics information presented in OPA2991 datasheet:

To confirm the estimate is okay, please use Figure 7-6 and Figure 7-7.

For TLV9002 Ib & Ios, the typical value is equal to the mean plus/minus one standard deviation.

 Input bias current Input offset current Sigma 5 pA 2 pA 4 Sigma ± 20 pA ± 8 pA 6 Sigma ± 30 pA ± 12 pA

Significance of 4 sigma:

At 4 σ (± 20pA), 99.9937% of the distribution has an input bias current less than ±20 pA, which means 0.0063% of the population is outside of these limits, which corresponds to about 1 in 15,873 units.

At 4 σ (± 2pA), 99.9937% of the distribution has an input offset current less than ±8 pA, which means 0.0063% of the population is outside of these limits, which corresponds to about 1 in 15,873 units.

Significance of 6 sigma:

For specifications with no value in the minimum or maximum column, consider selecting a sigma value of sufficient guardband for your application, and design worst-case conditions using this value. For example, the 6-σ value corresponds to about 1 in 500 million units, which is an extremely unlikely chance, and could be an option as a wide guardband to design a system around.

TI disclaimer:

Process variation and adjustments over time can shift typical means and standard deviations, and unless there is a value in the minimum or maximum specification column, TI cannot assure the performance of a device. This information should be used only to estimate the performance of a device.

All the best,
Carolina