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TLK2711-SP: external power dissipation

Adam Daluga
Expert 6385 points
Part Number: TLK2711-SP

Hello,

I have a question about the TLK2711-SP’s expected power dissipation. In the recommended operating conditions section, there is a nominal current draw for various operating conditions. Normally I’d expect recommended operating conditions to only include minimum-maximum ranges (i.e. stressing parameters).

 Ultimately I’m interested in a current budget for our application, and how to interpret these numbers. Do the reported currents here represent current into the supply pin before accounting for capacitive loads driven by the TLK? I can see the relation between the currents and powers listed, but as for the 550 mW figure – for example, does this mean (550 – 400 ) = 150 mW is the budget for driving capacitive loads @ 2.5 Gbps?

Thanks,

Adam

  • 0
    TI__Mastermind 27980 points

    Hi Adam,

    The current specs provided in the datasheet are measured at the supply pin. Can you clarify what you mean by "capacitive loads driven by the TLK?"

    I don't expect that the difference between the 550 mW and 400 mW specs is the budget for driving capacitive loads. These should just be max and nominal power dissipation specs.

    You can calculate a max supply current spec by taking max power dissipation divided by supply voltage. I expect that max power dissipation was measured at max supply voltage, but using min supply voltage in this calculation could give a safer max spec on supply current.

    Best,

    Lucas