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HMC807LP6CE ; About controlling evaluation board

Hello,
I'm Jungmoo Lee.
I want to ask something about controlling Evaluation Board of HMC807LP6CE.
I bought Evaluation Board of HMC807LP6CE last week and tested it working.
I installed software and followed operating guide.
But it is not controlled at default setting.
I checked some control with software and current state is as below,
- VCO control is OK
- PFD control is OK
- CP control is OK
But divider(N-Counter) control does not operate.
I think from VCO buffer to N-Counter path does not operate.
And there is RF Output frequency when disabled bias current.
What do I have to do in this case?
Or is there any control in the GUI that I missed?
Please confirm this problem.
Thanks.
Jungmoo Lee
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  • Hi Jungmoo,

    It sounds like the eval board was working and now it is not; is that correct?

    Does it work for settings other than the default settings? Different frequency, divide reference, etc.?

    Does the evaluation board appear to be populated with all of the components? Particularly the loop filter components?

    The eval schematic shown in the datasheet shows C62 as do not populate but it actually should have a 0Ω resistor in that location. Our BoM shows C62 = 0Ω so manufacturing should have loaded a component there. Please verify that jumpers J1 and J3 are INSTALLED and that Jumpers J2, J4, J5 and J6 are NOT installed.

    Are all of the components properly soldered down (no tombstones, wrong components loaded, etc?

    Do you measure the proper voltages at each pin on the HMC807 per page 7-3 of the datasheet?

    If none of these things provides any answers we'll need more information than your providing in order to help you. Please show us a screen shot of the 'Main GUI' & the 'Detailed GUI' and confirm the frequency your trying to lock to, reference frequency (50MHz??), fractional? INT?


    It's possible you have defective board (despite the fact that these are tested prior to leaving the factory) or may have accidentally damaged it.

    Best Regards,

    Marty

Reply
  • Hi Jungmoo,

    It sounds like the eval board was working and now it is not; is that correct?

    Does it work for settings other than the default settings? Different frequency, divide reference, etc.?

    Does the evaluation board appear to be populated with all of the components? Particularly the loop filter components?

    The eval schematic shown in the datasheet shows C62 as do not populate but it actually should have a 0Ω resistor in that location. Our BoM shows C62 = 0Ω so manufacturing should have loaded a component there. Please verify that jumpers J1 and J3 are INSTALLED and that Jumpers J2, J4, J5 and J6 are NOT installed.

    Are all of the components properly soldered down (no tombstones, wrong components loaded, etc?

    Do you measure the proper voltages at each pin on the HMC807 per page 7-3 of the datasheet?

    If none of these things provides any answers we'll need more information than your providing in order to help you. Please show us a screen shot of the 'Main GUI' & the 'Detailed GUI' and confirm the frequency your trying to lock to, reference frequency (50MHz??), fractional? INT?


    It's possible you have defective board (despite the fact that these are tested prior to leaving the factory) or may have accidentally damaged it.

    Best Regards,

    Marty

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