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TLK10034: Performance improvement with VDDA 0.8-0.9V

Todd Rollins
Prodigy 50 points
Part Number: TLK10034

For a poor PCB layout we're unfortunately stuck with, we've found that lowering the VDDA voltage below its 1.0V +/-5% spec gives us reliably good performance, so far over temperature as well.  VDDT, DVDD & VDDD are still at 1.0V.  Does this make sense from an IC design point of view?  Are there serious reservations about operating this pin at this voltage?

  • 0
    TI__Mastermind 19135 points

    Hi,

    I'm unfortunately not able to provide an explanation for this VDDA effect you are observing. Perhaps some TLK high-speed driver or EQ stage bias current or voltage headroom are changing favorably. I would not have serious reservations about this low VDDA level you are using. Specifically, there is no risk of damage to the device. The key caveat here however is that TI can no longer guarantee parametric performance per datasheet limits if you operate VDDA outside of 1.0V +/-5%.

    Regards,

    Rodrigo Natal

    HSSC Applications Engineer