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TLK10031 power supply (ripple and separation) requirements

Michael Yampolsky
Prodigy 200 points

Hello,

We are considering to implement KR interface with TLK10031 or TLK10032.

However, there is no detailed requirements for voltage ripple and management of power supplies.

The EVM reference design seems to be totally over-design and not reasonable for mass production.

Where can I get detailed requirements for power supply of these devices?

Thank you in advance,

Michael

  • 0
    TI__Mastermind 31600 points
    Michael,

    I have moved your post to the High Speed Interface Forum so that it gets visibility from the experts.

    Patrick
  • 0
    TI__Genius 16150 points

    Hi Michael,

    Power supply ripple has the effect of increasing jitter on the internal clock signals, so the same concerns about increased reference clock jitter will apply to the case of increased power supply ripple.

    There is, unfortunately, not a good way to measure or quantify how different amounts of ripple impact performance. In general, though, it should be OK to use switched-mode power supplies as long as care is taken to minimize the ripple seen at the TLK device´s power pins.

    For example, using a buck converter with a higher switching frequency and suitable LC values for the power filter, then using appropiate local decoupling capacitances (placed close to the device pins) and ferrites (as needed), it should be possible to develop a low-ripple supply.

    As well, you are right, to reduce risk, generally EVM are "over-designed" although, is a great help to get a guideline for the designs of customers.

    Best Regards,

    Luis Omar Morán Serna

    High Speed Interface

    SWAT Team