• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 14 subscribers
  • Views 237 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ISO7720-Q1: ISO772x, ISO642x Keying Frequency and Emissions

Colin Jack
Prodigy 20 points

Part Number: ISO7720-Q1

In my design, I plan on using ISO772x or ISO642x devices for translating data across high voltage, while running a wideband low-noise ultrasound amplifier in proximity on the same PCB. I was concerned about what the keying frequency for the carrier was, considering my amplifier bandwidth extends to 1GHz, and if radiated emissions would be significantly present on the output signal given 50+dB of gain. I was also curious what the EMI reduction techniques of these devices consisted of, and if the modulation oscillator is free-running or only active while data is being passed. Do either of these device series have lower radiated emissions than the other?

If these parts would not be suitable considering the requirements, would there be an alternative part you would recommend?

  • +1
    TI__Mastermind 21775 points

    Hi Colin,

    Thanks for reaching out.

    Great to hear that you are considering TI digital isolators for your application. The On-Off Keying (OOK) Frequency of the ISO77xx and the ISO64xx device families are different from each other. The OOK frequency for the ISO77xx device family is ~450MHz while the OOK frequency for the ISO64xx device family is ~1.5GHz.

    These device families have completely different architectures and the ISO64xx device family is the newest generation of digital isolator we currently offer. The ISO64xx devices are also optimized for emissions and also support up to 150Mbps.

    Regards,
    Aaditya