AD9547, AD9548, AD9549 EV-Boards

Hi,

I have a few questions regarding the AD954x Evaluation boards.

1. Can the AD9548 EV-board be used to evaluate the performance of the AD9547 provided reference is >1kHz and I/O's are limited to the number available on the AD9547? (We do have a few AD9548 EV Boards)

2. What is from the performance point pf view the difference between the AD9547 and AD9549? We want to produce a stable output frequency of 200 MHz from a jittery 8kHz reference. We also need a "Self disciplining" functionality which is available on the AD9547/8. Adjusting the phase of the output signal is also required.

Regards,

Fred

  • 0
    •  Analog Employees 
    on Aug 16, 2012 6:04 PM

    Hello Fred,

    > 1. Can the AD9548 EV-board be used to evaluate the performance of the AD9547 provided reference is >1kHz and I/O's are limited to the number available on the AD9547? (We do have a few AD9548 EV Boards)

    Yes. You shouldn't see any difference in performance.

    > 2. What is from the performance point pf view the difference between the AD9547 and AD9549? We want to produce a stable output frequency of 200 MHz from a jittery 8kHz reference. We also need a "Self disciplining" functionality which is available on the AD9547/8. Adjusting the phase of the output signal is also required.

    The system clock PLL on the AD9547 is quieter on the AD9547, so you can expect the AD9547 to have lower jitter.

    The digital PLL logic is more sophisticated on the AD9547. For instance, on the AD9549 you should first verify that you have a valid reference input signal prior to attempting to lock the loop for the first time. This is a non-issue on the AD9547.

    Both PLLs allow you to adjust the phase of the signal.

    The AD9549 doesn't have a self-disciplined sync feature.

    On the other hand, the AD9549 is cheaper and still a very good PLL for many applications.

    -Paul Kern