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DP83848C: Asking for the dp83848 schematic review

SHH
Mastermind 30251 points
Part Number: DP83848C

Hi Team,
Customer is designing dp83848. Could you please help review the dp83848 schematic?
The red block marked, please help check the resistor vlaue.
Please provide your comment.

Thanks,
SHH

  • 0
    TI__Mastermind 18425 points
    Hello SHH,

    We will take a look and have feedback available before end of this week. We also have a design and layout guide that the customer can refer to in the meanwhile: www.ti.com/.../snla079d.pdf

    -Regards,
    Aniruddha
  • 0 in reply to Aniruddha Khadye
    TI__Mastermind 18425 points
    Hello SHH,
    Please find my review below,

    Ensure that RBIAS is 4.87kohm 1% resistor
    Please check the connection from PHY to RJ45 connector. TD+/- of the PHY should connect to TD+/- of the RJ45. The same would apply for RD+/-. The Center Taps (CT) of the magnetics on the RJ-45 should be pulled up to AVDD with 0.1uF decoupling caps to ground on each CT. A reference diagram is included in the datasheet section “TPI Network Circuit”.
    Pull up resistors on TD+/- and RD+/- pins should be 49.9ohms 1%tolerance
    MDIO pull up resistor should be 1.5kohm
    RX_CLK shouldn’t be connected to XI of the PHY, connecting only the crystal should be enough
    Ensure that the crystal and the magnetics meet the requirement mentioned in the datasheet.
    Place the 49.9ohm resistor network close to the PHY. The CT decoupling caps should be placed close to the magnetics.
    Decoupling caps for PFBOUT, PFBIN1, and PFBIN2 should be kept closer to their respective pins.
    Review the design and layout guide for additional information: www.ti.com/.../snla079d.pdf

    -Regards,
    Aniruddha