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LMK5C33216A: Min Power Consumption

Joe Paolino
Intellectual 610 points

Part Number: LMK5C33216A

Hello,

Using TICs Pro and the ROM1.tcs as a starting point, I have disabled all outputs, DPLLs, and APLLs with the exception of APLL3 and output 6.  I need a single 491.52 MHz low jitter output locked to an external 48MHz TCXO.

Here's the resulting APLL3 setup.  I do not see any indication of power consumption in TICsPro.  For the most minimal functionality enabled to achieve the above, what should I expect for current consumption?

Thanks

Joe

image.png

  • +1
    TI__Genius 16960 points

    Hi Joe, 

    As you pointed out, TICS Pro does not have a power consumption calculator built in. Looking at the power consumption characteristics in the datasheet, I would expect the total power consumption to be around 225mA * 3.3V = 742mW for your configuration. I've also put a breakdown of the current consumption below for reference. Let me know if you have any other questions. 

    Block Typical Current Consumption (mA)
    XO input 3.5
    XO doubler 0.3
    APLL3 120
    Analog bias 42
    Digital 34
    HSDS driver 25
    Total 224.8

    Regards, 

    Connor

  • 0 in reply to Connor Lewis
    Intellectual 610 points

    Thanks, Connor.  I was coming to a similar conclusion based on the datasheet wording for IDD-ANA and IDD-DIG.  I noticed that APLL1 can be disabled and was hoping that might reduce that current significantly.

  • 0 in reply to Joe Paolino
    TI__Genius 16960 points

    Hi Joe, 

    That's correct, in my current consumption estimate I'm assuming that APLL1 is disabled.