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CDCE62005 Eval Board

Chris Belmonte
Prodigy 160 points
Other Parts Discussed in Thread: CDCE62005

Hello,

I recently got the eval board for part# CDCE62005 and installed the software and hooked it up.  In playing with the part I have two questions:

1.  My goal is to use CDCE62005 solely for its smart mux capabilities.  I want both the primary and secondary reference to be 100 MHz and the output to be 100 MHz.  In the case of the primary ref failing the secondary ref would automatically be switched to.  The software doesn't seem to demonstrate that if I have the smart mux set to select pri ref then sec ref if I turn pri ref to 0 the output switches to sec ref.  This may be because I don't actually have the CLK input and output hooked up, but as the input propagated to the output I would have thought it would be capable of switching as well.  Even with the smart mux set to the secondary input I couldn't see it on the output.  I was going to test this with real signals when I noticed problem #2.

2.  With just the USB plugged in and the software running for about 10 minutes the chip became extremely hot to the touch and may have started to smell a bit.  Is this because I was playing with the software without any CLK inputs/outputs hooked up?  Or is there some other reason I am not seeing.  I am running it using USB power only.

I know that was a bit convoluted but I appreciate the help!  If anything needs clarifying just let me know!

Thanks,

Chris

  • 0
    TI__Expert 4585 points

     

    Hi Chris,

     

    Here are my comments below

    1.  You need to provide input clocks to see the capabilities of SMART MUX. I recommend you to use the PLL output to get 100 MHz. 

    2. This is a high performance device. And it draws lot of current (please see in the datasheet). If you need just one output, please turn off the other outputs and disabled the dividers. Dividers draw significant current.

     

    Thanks,

    Firoj

     

  • 0 in reply to Firoj Kabir
    Prodigy 160 points

    Firoj,

    Hello and thank you, will do.

    For the smart mux capabilities I need two input clocks and a reference?

    Also is there any good way to test the chip short of laying out a PCB for the oscillator?  Ie is there any test source I should use to supply the two clock inputs to the chip?

    Thanks,

    Chris

  • 0 in reply to Chris Belmonte
    TI__Expert 4585 points

     

    Chris,

    For the smart mux capabilities I need two input clocks and a reference?

    What do you mean by two input clocks and a reference? You just need two input clocks for PRI_REF and SEC_REF and set SMARTMUX (Auto Select PRI then SEC).

    You can use CDCE62005 EVM schematic as a reference which is in part of CDCE62005 EVM User's guide.

    You can use any clock sources which are stable.

    Thanks,

    Firoj