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LMX2820: Supply current breakdown

Jacob Freedman
Prodigy 20 points
Part Number: LMX2820
Other Parts Discussed in Thread: TICSPRO-SW, ,

Please provide supply current metrics on each of separated pins in different modes.  For example if VCCBUF is how the doubler is also supplied, provide buffer ON/OFF current, doubler ON/OFF, etc.  It should be easy for the designer to add up requirements for his own use of 1 output or 2 outputs, SYSREF on or off, Ext/Int PFD mode, Ext/Int VCO mode, fractional vs. integer mode etc.

Thanks,

-Jake

  • 0
    TI__Genius 11900 points

    Hello Jake,

    You can get this information on TICSPRO-SW.

    When you turn on different blocks of the device the current approximation changes. We do not guarantee a maximum specification on the datasheet, so you can use the TICSPRO-SW approximation as a typical current consumption value.

    Thanks,

    Vibhu

  • 0 in reply to Vibhu Vanjari
    Prodigy 20 points

    Hi Vibhu,

    Perhaps you did not understand my question.  Your answer requires the user to have a LMX2820EVM and be connected to it to actively make changes and observe the total TICSPRO estimate.  At that point I can measure it myself if I have to go into a lab with a powered board to get this information and even then it will only be on the total current consumption. For obvious reasons right now it is desirable to have TI provide it.

    I am asking you for breakdowns for the different supply pins under different operating conditions.  I didn't say anything about maximum. If necessary I will have to go and swap all the 0Ω resistors on the board with 0.1Ω to make the measurements myself.  TI support really should be able to provide the supply breakdown information as it does for the LMK products.  

    Regards,

    -Jake

  • 0 in reply to Jacob Freedman
    TI__Genius 11900 points

    Hello Jake,

    The user does not need an LMX2820EVM. TICSPro estimates the current based on the configuration on the software. We have taken total current consumption measurements with different blocks of the LMX2820 powered on/off and entered it into the software code.

    You are correct that this will be the total current consumption only and not a pin by pin current consumption.

    We will check to see if there is any pin by pin data available. Can you give me insight as to why the power consumption of each pin is important for your design, when all the supplies can come from the same source?

    Thanks,

    Vibhu