• Resolved

TL084: TL084 VOH with 5k Load

Part Number: TL084

Posting for FAE:

Hi Collins,

 

Could your team help provide the peak Output Voltage of TL084 with RL=5k ohm at full temp range like below? A simulation results or test results with RL=5k ohm can both be OK.

Customer is evaluating our TL084 to replace ADTL084. While, the Vom @ 2k ohm can’t meet the spec and the datasheet lacks 5k ohm spec. I tried to use the TINA spice model to do the simulation, but the result is much better than the load curve, which doesn’t match with each other.

 

If we can’t provide those data on TL084, I think TLV4172 can be an alternative, but the price goes higher. Look forward to your feedback sincerely, many thanks!

Regards,
Collin Wells
General Purpose Amplifier Applications

  • Collin,

    The image called "like below" didn't come through.

    Are the a VCC values and Vout target known?

    Here is 10k and 2k data from data sheet.

    Regards,
    Ronald Michallick
    Linear Applications

    TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).

     

  • In reply to Ron Michallick:

    Hi Ronald,

    Thanks for your reply. We've seen the 10k & 2k load Vom curve at all temp range in datasheet.
    1. Our customer wants to have the 5k load Vom curve at all temp range?
    2. Are we able to provide short-output current?

    Those two data can be provided by chip test or simulation.

    thanks!
    Bell
  • In reply to Bell Ye:

    Bell,

    Do you have a full part number?
    There are two TL084 die designs. There may be small differences.

    Regards,
    Ronald Michallick
    Linear Applications

    TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).

     

  • In reply to Ron Michallick:

    Hi Ronald,

    The full part # should be TL084QDR, thanks!

    Bell
  • In reply to Bell Ye:

    Bell,

    I recorded high and low drive for a TL084QID sample (VCC = +/-15V).

    VOL with 5k load was -12.76V to -13.10V across temperature

    VOH with 5k load was +13.49V to +13.59V across temperature

    Short current while driving high was 21mA to 36mA across temperature

    Short current while driving low was 42mA to 56mA across temperature

    I attached the raw data with a few charts.

    TL084Q VOL, VOH.xlsx

    Regards,
    Ronald Michallick
    Linear Applications

    TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).

     

  • In reply to Ron Michallick:

    Hi Ronald, 

    Thanks a lot for providing the data.

    I have one question: how do you get the Vom and short current specs? From one TL084 sample test or by design simulation?

    And could you help make a plot like the below curve, please? The plot in excel is not that explicit to read. Many thanks!

    thanks,

    Bell

  • In reply to Bell Ye:

    Bell,

    This was actual lab sample data.

    VOH

    VOL

    Regards,
    Ronald Michallick
    Linear Applications

    TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).

     

  • In reply to Ron Michallick:

    Hi Ronald,

    Customer is satisfied with the test result. However, this is only from one sample.
    To get an estimated data by probability calculation, customer hope we can provide more sample's test data. 6 units is the best.
    Could you kindly help on this? Thanks a lot!

    regards,
    Bell
  • In reply to Bell Ye:

    Bell,

    I could do five more units, but will not at this time. I don't know the application VOH requirement. If I don't know the reason behind the data request, I won't provide data that may be improperly applied. If a few mili-volts makes or breaks the application then it is time to stop. The data I provided assumes VCC+ is exactly 15V, if the 15V supply varies so will the VOH in a 1:1 ratio. If the application supply isn't 15V then the data is close but not correct. Is the load exactly 5k? Does it terminate to ground? Is there any other load (like feedback).

    Regards,
    Ronald Michallick
    Linear Applications

    TI assumes no liability for applications assistance or customer product design. Customer is fully responsible for all design decisions and engineering with regard to its products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning Customer's design. If Customer desires engineering services, the Customer should rely on its retained employees and consultants and/or procure engineering services from a licensed professional engineer (LPE).

     

  • In reply to Ron Michallick:

    Hi Ronald,

    Totally understand your concern. Currently, I don't have the detailed application schematic of TL084 and I believe the Vom specs @5k is key to ctm. Other specs has already passed the review at customer side.

    The Vom test data@5k you provided can also meet the spec, but still need to be more secured. The only one sample data may not be convincing if they take more strict review. Therefore, hope to get another 5 more samples. Let me know if there is other concern.

    Many thanks!
    Bell