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"Easy" 3.5GHz clock source for AD9914 evaluation board?

Hi,

We're about to use a AD9914 evaluation board and require a 3.5GHz clock to drive it.  Phase noise performance is non-critical.  There appear to be a number of Analog PLL devices with integrated VCOs that might do the job; an evaluation board for one of these, programmed via SPI and coupled to the AD9914 board, might be an ideal solution (especially one that can be fitted with an onboard reference TCXO).

Can anyone recommend a particular VCO/PLL device / evaluation board for this purpose?

Many thanks

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  • Hi,

    Here are some of my recommendations:

    1. The AD9914 has an internal PLL in which you could use to generate the required system clock. However, the PLL limits the system clock between 2.4GHz to 2.5GHz because of its VCO. Using the evaluation board, a lower frequency signal can be sourced to J104 and just enable the PLL and set the multiplier to have a system clock that is within the specified range.

    2. If a 3.5GHz clock is really desired, I found HMC836 to be a suitable PLL with integrated VCO. The range of its frequency output is from 3.365GHz to 3.705GHz. The part also has an evaluation board with its resources available online. You can also check out this parametric search for other suitable parts.

    Best regards,

    Mark

Reply
  • Hi,

    Here are some of my recommendations:

    1. The AD9914 has an internal PLL in which you could use to generate the required system clock. However, the PLL limits the system clock between 2.4GHz to 2.5GHz because of its VCO. Using the evaluation board, a lower frequency signal can be sourced to J104 and just enable the PLL and set the multiplier to have a system clock that is within the specified range.

    2. If a 3.5GHz clock is really desired, I found HMC836 to be a suitable PLL with integrated VCO. The range of its frequency output is from 3.365GHz to 3.705GHz. The part also has an evaluation board with its resources available online. You can also check out this parametric search for other suitable parts.

    Best regards,

    Mark

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