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LMK01000: Too many VCC. What are the diferences?

TI-CSC
Genius 11290 points
Part Number: LMK01000

Hello E2E Experts,

Good day.

1. May I ask what are the differences between different VCC names? VCC1, VCC2..., etc.

2. Is it internally connected?

3. What is the reason behind many bypass capacitors for each Vcc pin?

Regards,

CSC

  • +1
    TI__Mastermind 27831 points

    Hi,

    The VCC are not internally connected, but you supply the same voltage to them.

    May of these are to supply different outputs.  In the case that the outputs are running at different frequencies, it is good to have some isolation and decoupling for these.

    If all the outputs are the same frequency, then this isolation is less critical and you can short them together.

    If they are different frequencies, then it is better to isolate them to get lower crosstalk between outputs.

    On our evaluation board, we put bypass capacitors everywhere to cover the worst case scenario of all outputs at different freuqencies