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LMK04832EVM: Recommended oscillator EVMs/clocking EVMs

Wouter Kragt
Intellectual 930 points
Part Number: LMK04832EVM
Other Parts Discussed in Thread: ADC09QJ1300EVM,

Hello team,

For a demonstration of the ADC09QJ1300EVM, I need a reference clock of 1.3GHz. 

Unfortunately, I do not have a dedicated clock generator.

I would like to use the LMK04832EVM to provide a reference clock of 1.3GHz for the ADC09QJ1300EVM. (ADC09QJ1300EVM Evaluation board | TI.com)

The LMK04832EVM needs its own clock reference. As I do not have a dedicated clock generator in the lab, what oscillator EVM is recommended to use as a reference clock (122.88MHz) for the LMK04832EVM?

Is there a clocking EVM that can supply the 1.3GHz at once, without needing another oscillator. This would simplify things quite a bit.

Thank you.

Kind regards,

Wouter Kragt

  • 0
    TI__Expert 7695 points

    Hello Wouter,

    Unfortunately, we do not have an oscillator that will provide that high of a frequency. Instead, I would suggest to use one of our oscillators and one of our RF synthesizers/PLLs/jitter cleaners/network synchronizers to obtain that 1.3 GHz output frequency.

    Oscillator: The first step is to generate a frequency with one of our oscillators. To determine which oscillator works best for your use case depends on which second device you require to generate a 1.3 GHz output. If you only need to generate this frequency, then I would recommend one of our RF synthesizers, but if you require jitter cleaning or JESD204B/C compliance then I would suggest another one of our parts (probably a jitter cleaner or network synchronizer). After determining which second device you'll use, we can pick an oscillator since this decision will be dependent on the max input frequency the second device can accept.

    RF/Clock Gen/Jitter Cleaner: The next step is to use an RF synthesizer, clock generator, or jitter cleaner to output a higher frequency than what our oscillators can offer. Ideally, an RF synthesizer is what you want to use to output such a high frequency with better performance and all of our RF synthesizers except LMX2571s should be able to output a 1.3 GHz signal. A clock generator, jitter cleaner, or network synchronizer can also work but may hurt the performance of your clock tree.

    If you'd like further help in choosing the part, please tell me your desired output jitter, output types, number of outputs, supply voltage, package size, JESD204B/C compliance requirement, and (if applicable) input frequency. Hope this helps.

    Good Luck,

    Andrea