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DP83825EVM: What's the 33OHM resisrors used for?

Spura Xing
Prodigy 10 points
Part Number: DP83825EVM
Other Parts Discussed in Thread: DP83825I

In the DP83825I reference schematic, theire are three 33Ohm resistor: RX_D0 conncet to TX_D0 with 33ohm,etc,What's the 33OHM resisror used for? What if I don't use them,what will happen? thanks.

  • 0
    TI__Genius 16612 points

    Hi Spura,

    These resistors are used for impedance matching on the traces to reduce reflections between the transmitter and receiver.

    The effect of removing them will depend on your layout - I recommend simulating with the DP83825 IBIS model for your own design.

    Thank you,

    Evan