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Original question:

DP83867IR: DP83867 1000-BASETX Configuration

DP83867IR: RJ45 - Schematic between datasheet and EVM

Shunsuke Nagata
Genius 13060 points
Part Number: DP83867IR

Hi,

The datasheet and EVM has different schematic for the connection of RJ45. Could you please let me know which schematic is recommended? Or Can user use both?

Below is datasheet information: Adding 10nF(2kV) to PHY GND in RJ45 side

And below is EVM schametic: Adding 10nF to GND in RJ45 side:

Regards,
Nagata.

  • 0
    TI__Mastermind 27750 points

    Hi Nagata,

    The datasheet shows the connection to ground and the EVM shows the connection to ERTH_GND which would be the shield ground of the RJ45. In the schematic you'll also notice an RC network isolating the ERTH_GND from the PHY ground. This is to help improve the EMC/EMI performance. This isolation is optional, hence the datasheet just shows the same ground on both sides. The EVM shows the shield ground isolated from the PHY ground for this purpose.

    Thanks,

    Lucas

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and it is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).