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Original question:

CDCE6214-Q1: Some Doubler/Divider and Fractional Integer values take PLL out of lock despite same VCO frequency

Part recommendation.

Matthew Baker
Intellectual 1070 points
Other Parts Discussed in Thread: CDCM6208, LMK61E2, LMK61E0M

Hello, 

I am looking for a clocking solution that can support 4-5 fractional pll outputs. The important thing is VCO frequency remains unchanged on the other outputs when one of the outputs is changed. a small solution size is also preferred. I appreciate the recommendation. 

I also need a single input single output programmable oscillator in a small package. This must be programmable through I2C. 

  • 0
    TI__Intellectual 1070 points

    Currently SI564 is being used. I am looking for a smaller and cheaper solution.

  • 0 in reply to Matthew Baker
    TI__Mastermind 19000 points

    Matthew,

    Can you provide an idea of the frequencies that you need to generate? A part such as the CDCM6208 (4 integer divider outputs, 4 fractional divider outputs) may be suitable here.

    For a programmable oscillator, the LMK61E2 is suitable for LVPECL/HCSL/LVDS formats, or the LMK61E0M for LVCMOS.
    Thanks,

    Kadeem

  • 0 in reply to Kadeem Samuel
    TI__Intellectual 1070 points

    Indeed, the output of the clock generator on our system would need to independently get the four outputs to run between 50MHz and 400MHz. The clocks will be used for broadcast and consumer video. The video formats that will be processed will be controlled by the user. This’ll boil down to a couple of dozen frequency plans quite certainly, but we’d very much like to use this as a “any freq. out” part for flexibility. The device must be reprogrammed at runtime so that any output may be reconfigured at a different frequency without any adverse effect like glitching on the neighboring clocks.

     

    The CDCM6208 looks like a great part but to be absolutely honest, there is this Renesas RC21008A part that the team has been taking a liking of late. Not saying that the door is closed for the CDCM6208, just that for this one, it’s going to be a though call pulling a 180°.

     

    The LMK61E2 look great too but much like with the Si564, our product can be more cost effective using a multi-clock circuit such as the CDCM6208 and RC21008A.

  • 0 in reply to Matthew Baker
    TI__Mastermind 19000 points

    Matthew,

    I have another part that I can recommend to you, but not on the public E2E forum yet. I have reached out to you privately to discuss this opportunity.

    Thanks,

    Kadeem