This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

  • TI Thinks Resolved

LMK03318: Question about clock generator in the datasheet

Prodigy 10 points

Replies: 1

Views: 38

Part Number: LMK03318

Hi,

I’m looking for LMK03318, and I have a few questions as following:

1. Does this chip have a default code inside? Because I see the datasheet as shown below. Could you help me to check this?

2. And I notice that configuring GIPO[0:5]=27, then output frequency as below, is that true?

OUT0-1=156.25MHz

OUT2-3=100MHz

OUT4=50MHz

OUT5=125MHz

OUT6=100MHz

OUT7=25MHz

3. As mentioned above, could I just only use the SECREF_P/N to be the reference clock and get the same output frequency? Because I see the datasheet that PRIREF is enabled, as shown below. I’m not sure if I null the PRIREF_P/N pin, is that ok?

 

 

Thank you.

Best Regards,

From April

  • Genius 10700 points

    Hi April,

    I can't see your pictures, but yes there are 64 pages of factory default (ROM). And yes your listed output frequencies are correct if you mean GPIO[5:0] = 27. 

    Yes you can use SECREF only, as long as you are using XTAL, not an XO, because SECREF is configured as XTAL input. Since PLL input is set as REFSEL, you'll need to configure the REFSEL pin to select SECREF (table 3 of datasheet).

    Regards,
    Hao

    Clock and Timing Systems & Applications

    To view training videos on Clock and Timing Solutions please visit  TI Precision Labs ​​​​

    More information Clock and Timing System products: http://www.ti.com/clock-and-timing/overview.html

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.