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INA826 - Minimum Slew Rate

Lars Hummel
Prodigy 165 points

Other Parts Discussed in Thread: INA826

Dear Sir or madam

I want to use the INA826 vor a 10Vp 12kHz sinusoidal Input Signal and my slewrate is very close to the typical Slew-Rate Value @ 25°C stated in the datasheet.

Can you please tell me the lowest value of the Slew-Rate (incl. all tolerance Parameters (temp and Initial)

Regards Lars Hummel

  • 0
    TI__Mastermind 25865 points
    Hello Lars,

    Please note that the slew rate specification is a typical value, which means that it is not tested for at final test. The value listed in the data sheet represents a +/-1 sigma value, which is ~68% of all devices.

    The slew rate will change with process and temperature. We estimate that the slew rate may change up to +/-25% over process. In addition to process, temperature will affect the slew rate by an additional +/-25% (note that cold temperatures affect it the most). So, overall you can expect a change in slew rate over process and temperature of up to +/-50%.
  • 0 in reply to Pete%20Semig
    Prodigy 165 points

    Hello Pete

    Thanks for your reply.

    I do not understand your two Points right:

    Point 1: Sigma.

    ? Does the typical value of the slew rate mean that this typical value is in the middle of the gaussian courve?

    ? If I will go then from this typical Point 4 Sigma towards smaller values - then aprox 99,993666% are above this value ?

    ? The question then will be what is the value (Delta V/us) for one Sigma?

    Point 2: Tolerance:

    Can I only look on the two tolerance values (25% process + 25% temperature = 50%) to get to the smalles slew rates?

    Or do I also have to take the gaussian Distribution into account?

    ? Is the smalles slew rate 2V/us -50% = 1V/us for all the devieces over temp and proces?

    --> Final Problem Description: I really need a reliable value for the smallest slew-rate for approx 99.9% of the devieces.

    Thanks in advance

    Lars Hummel

  • 0 in reply to Lars Hummel
    TI__Mastermind 25865 points
    Hello Lars,

    We estimate that a range of 0.5V/us to 1.5V/us (which is 1V/us +/-50% due to process and temperature) should represent approximately +/-99.9% of the devices. Please understand per my previous post that the slew rate is not tested at final test and you may obtain slew rates outside of these values. Therefore you should implement a robust testing and verification scheme for your final system to ensure desired performance.