• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 21 subscribers
  • Views 123 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMK05318B: Questions of LMK05318B

Jimmy Lai
Expert 6845 points
Part Number: LMK05318B

Dear Team,

I suggested the LMK05318B  can achieve 6 sets of different frequency outputs through Programmable Drivers to customer.
we have some questions as below, could you help to support these questions?


1. Is there a single-group 122.88MHz output model?
2. Are there two sets of outputs, 80MHz and 122.88MHz models?
3. How to choose TCXO? Are there any restrictions?

How about this one?

e2e.ti.com/.../lmk04826-can-lmk04826-generate-122-88mhz-245-76mhz-using-20mhz-vcxo

Many Thanks,

Jimmy

  • 0
    TI__Genius 11315 points

    Hi Jimmy,

    1. What do you mean by "output model"? There is the LMK05318B profile available in TICSPRO which helps the customer frequency plan and visualize the register settings.
    2. The LMK05318B supports up to 2 frequency domains through APLL1/VCO1 and APLL2/VCO2. More specifically, APLL1 can generate frequencies that are integer divisible by VCO1 (centered at 2500MHz) and APLL2 can generate any frequency divisible by VCO2 (tunable between 5500MHz to 6250MHz). This means that 80MHz AND 122.88MHz is not supported on the LMK05318B. Our newer network synchronizers, LMK5B33216, support up to 3 frequency domains and can output 80MHz and 122.88MHz simultaneously.
    3. A VCXO is not necessary with the LMK05318B. The TCXO depends on the system's stability requirements. When the outputs are locked to the TCXO, the outputs have the same ppm accuracy and stability as the TCXO input. If stability does not matter significantly, a low-cost XO may be used.

    Regards,

    Jennifer