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TPA3110D2-Q1: Gain variations

Dear all,

Please provide me with following two data about Gain variations.

No.1,

Please provide with the distribution map about Gain at 25℃.

It is OK that the data condition is the same with data sheet p.5 '6.6 DC Characteristics'.

My customer want to know about production tolerance in order to judge whether it is need to correct offset.

No.2,

Please provide with the graph like Figure 15 at low / typ / high temperature conditions.

My customer want to know about variability in order to judge whether it is need to correct offset drift.

My customer want these by this weekend.

Could you suggest by this weekend? Or could you inform by when you suggest me?

Best regards,

  • Hello Yamamoto-san,

    I've assigned this post to the appropriate applications engineer. Please look forward to the response.

    Regards,
    Karl
  • Dear all,

    Could anyone answer this?
    I am looking forward hearing from you.

    Best regards,
  • Takao,

    The datasheet has upper and lower limits for the gain. This means that TI ensures that the gain is within these parameters either through test or design. If this tolerance is not tight enough then even if we share distribution data, it will not guarantee anything besides what is already in the datasheet.

    I have some data about how the average gain varies across temperature. This isn't exactly like figure 15, but would it help your customer for question number 2?

    Thanks,

    -Clancy
  • Dear Clancy,

    Thank you for your reply!

    ■about Q1

    It is OK that you don't guarantee. It is OK that just measured value.

    My customer want to know how does this device have variability to get a rough idea.

    They want to judge whether they should correct primary error. 

    Therefore, we want the data of gain error at 25℃.

    ■about Q2

    Yes, of course.

    Could you give me some data?

    However, could you give me detail conditions of the data in order to clear the situation.

    Best regards,

  • This data is for VCC = 12V, RL = 8 ohms. I compiled the average gain for the same set of units at three different temperatures. Hopefully this will help your customer see how gain can vary with temperature:

    20dB:
    -40C , Gain = 19.34
    25C, Gain = 19.33
    125C, Gain = 19.29

    36dB:
    -40C, Gain = 35.57
    25C, Gain = 35.53
    125C, Gain = 35.42

    Thanks,

    -Clancy
  • Dear Clancy,

    Thank you for your answer and data!

    I would like to check two things.

    CHECK 1;

    Haw many is the number of this units?

    CHECK 2;

    Could you give me the raw data of 20dB at 25C?

    My customer wants to know about differences at typical condition.

    Best regards,

  • 1. This is from 90 units
    2. To share raw data, we probably need to make sure an NDA is in place and discuss this offline. I'll contact you separately.