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AFE5808 + LMK03806

santiago rodriguez
Prodigy 110 points
Other Parts Discussed in Thread: AFE5808, LMK03806, LMK04806, CODELOADER, AFE5805, AFE5801, CDCE72010, CDCM7005, LMK04906, LMK03002

Hi,

I'm developing a 64 channels rx ultrasound board. I'm intent to use 8 x AFE5808 for the analog rx chain.

Do the LMK03806 is a good choice for clock all the AFE5808 (clk_adc, clk_16X, clk_1x)?

Regards,

Santiago

  • 0
    TI__Expert 6320 points

    Santiago,

    The LMK04806 is probably a better solution. What is your clock rate that is needed?

    0508.A9RBF9D.pdf

    Thanks,

    Chuck Smyth, Apps Engineer, TI Medical

  • 0 in reply to Chuck Smyth
    Prodigy 110 points

    Hello Chuck,

    The frequency for the ADC sampling need to be up to 65 MHz.  And other frequencies I need could be up to 128MHz. I prefer all outputs in LVDS electrical characteristics.

    The specs in the datasheet are really good, but im afraid because I had a bad experience in the past with this kind of components, it demanded much time to debug and make it work.  Do you provide support or evm for this part?

    Regards.

  • 0 in reply to santiago rodriguez
    TI__Expert 6320 points

    Santiago,

    Alan is the applications support person for these clock devices:

    Alan.Ocampo@ti.com

    You can ask him detailed questions about the datasheet, etc.

    I hope that this helps.

    Thanks,

    Chuck Smyth

  • 0 in reply to Chuck Smyth
    TI__Mastermind 32575 points

    Hi Chuck- Thanks for passing along my name.

    Hi Santiago,

    I recommend the LMK04800 for Ultrasound clocking to meet the requirements for system clock synchronization and excellent close-to-carrier output phase noise.  I think the LMK04806 option could hit the target frequencies, but it depends on what other frequencies you might need.  A high-quality VCXO with good close-in phase noise will also be needed.

    Link to order an LMK04800 Evaluation Board and Download the board instructions:
    http://www.national.com/pf/LM/LMK04800.html#Boards

    Link to download CodeLoader (device programming) and Clock Design Tool (loop filter design & phase noise simulation) software:
    http://www.national.com/en/clock_timing/codeloader.html

    If you'd like to discuss your application needs more specifically, you may verify this answer and we can discuss more directly via email if you prefer.

    Best regards,

    Alan

  • 0 in reply to Alan O
    Prodigy 60 points

    This is a old threat so I am not sure if it is still monitored...

    I am trying to find the right chip to clock AFE5801 ADC. I am using a similar clocking scheme shown in AFE5805 datasheet fig. 90. The original clock is produced in the FPGA, which needs to be cleaned before going to AFE5801.

    My application is a bit different in that it only needs 1 channel in AFE5801, so I don't need multiple clock outputs nor they don't need to be synced.

    The datasheet shows CDCM7005 or CDCE72010 and the above posts suggest LMK04800... but I was wondering if there is any chip I can use that does not need an external VCXO just for simplicity... I am planning on using around 50 MHz sampling.

    Thanks!

    John

  • 0 in reply to John Lee2
    TI__Mastermind 32575 points

    You may consider using LMK04906 (6-output dual loop jitter cleaner/clock gen) configured for Single Loop mode (PLL2+integrated VCO).  You can use Clock Design Tool to enter a model of your input clock phase noise and simulate the output clock phase noise and RMS jitter performance for your application. 

    You may also consider LMK03002/C (4-output single loop jitter cleaner), but LMK04906 (in single loop mode) will have better jitter performance.

    Regards,
    Alan

  • 0 in reply to Alan O
    Prodigy 60 points

    Hi Alan,

    Thanks for the response! It's just what I was looking for.

    Thanks,

    John