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AWR2243: 40MHz clock

Antonio Puglielli
Expert 1025 points
Part Number: AWR2243

Hello,

I am designing a custom cascade board using an external clock. Have you found any impact of the clock distribution network?

1) External clock -> AWR master -> 1:3 clock buffer -> 3 slaves

2) External clock -> 1:4 clock buffer -> AWR master and slaves

See figure attached:


Is there a reason to prefer option 1 or 2?

Thanks,
Antonio

  • 0
    TI__Mastermind 18470 points

    Hi Antonio, 

    We go for option #1 since it represents a slightly lower BOM and makes use of the low jitter, low phase-noise, crystal oscillator circuit built into the AWR devices. In the case of option #2 the designer needs to provide their own clean clock source. 

    Thank you,

    -Randy