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LMG1025-Q1EVM: EVM

Ray Vincent Aranzaso
Genius 13515 points
Part Number: LMG1025-Q1EVM
Other Parts Discussed in Thread: LMG1025-Q1

Hi,

Good Day. I have a customer who is working LMG1025-Q1EVM. Please see below his query for your reference. Thank you very much.

I am looking for an EVM (evaluation board) that can be used with the LMG1025 as a signal source providing fast rise times approximately 1nsec?

I purchased the LMG1025 evaluation board and it needs an input pulse. It references a 100 nsec pulse but with a fairly fast risetime. My signal generator is not so fast more like 10sec fastest risetime. When used with the setup for the the LMG1025 (or 1020) it can provide an output pulse of approximately 10 nsec. So I am looking for an evaluation board function generator that can provide PWM with rise and fall times of approximately 1 nsec to used for evaluating the LMG1025.

I have the LMG1025-Q1EVM, the test input in the user guide makes use of a 100 nsec pulse but fairly fast risetime.

Just looking for a evaluation board that can serve as a signal generator with approximate Tr of 1nsec and pulse width of 100 nsec is okay

Best Regards,

Ray Vincent

  • 0
    TI__Genius 9301 points

    Hi Ray, 

    Our expert is out of the office this week. We are looking into this to see if we can provide an answer for you sooner than that. We'll get back to you with an update by tomorrow.

    Regards,

    Leslie

  • 0
    TI__Prodigy 80 points

    Hello,

    Thank you for reaching out on E2E!

    If by 10s you meant 10ns for your signal generator fastest risetime, then I would suggest the following.

    When using LMG1025-Q1 it should be possible for you to achieve a 1ns pulse using the signal generator you are using. Most function generators can only output pulses as low as 10ns, so to achieve a 1ns pulse on this EVM you need to use the AND gate input (J3). This AND gate will compare the input (J3) to an RC delayed function and when both outputs are high, the output will go high. This input pulse width can be fine tuned to see the desired pulse width on IN+. We recommend you start with 100ns and then reduce the pulse width down by the nanosecond or smaller until you see 1-2ns on the IN+ test point. The figure shows how this input pulse buffer works for your convenience.

     

    For the function generator we also recommend the following settings:

    • Frequency to 100 kHz
    • Signal range 0–3 V
    • Pulse width of 100 ns

    For more information on how you should set up your equipment or any additional information on this EVM please refer to our LMG1025-Q1 EVM User’s guide which I will link for you. Sections 8 and 9 will have information regarding the test procedure and pulse shortener.

    https://www.ti.com/lit/ug/sluuc20b/sluuc20b.pdf?ts=1657131038346&ref_url=https%253A%252F%252Fwww.google.com%252F

    You can also use another LMG1025-Q1 EVM to generate a fast rise and fall time for the input signal if you wish to do so.

    I hope this helps and don’t hesitate to reach out with any additional questions.

    Thank you,

    Donaldo