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Ethernet PHY

Per Magnusson
Intellectual 480 points
Other Parts Discussed in Thread: DP83630, TLK105, DP83848T

Hi,

I am going to select two Ethernet PHY that we will use in our products together with a STM32F MCU. I need one low budget PHY and one supporting IEEE1588. For the low cost products I am chosing between TLK105 and DP83848T and for the IEEE1588 support the DP83630.

Which is the best choice of  TLK105 and DP83848? What is the main difference between the two units?

Regards, Per Magnusson

  • 0
    TI__Mastermind 31600 points

    Per,

    You mention that you are choosing a Phy for "low cost products".  How high a priority is the cost?  The current 1k pricing for the two devices is:

    • TLK105:  $0.99
    • DP83848T:  $1.18

    If price is the primary concern, then the TLK105 would be your choice.

    If price is not your primary concern, could you please provide some details of your application and your key needs from the Phy?

    Patrick

  • 0 in reply to Patrick OFarrell
    Intellectual 480 points

    Patrick,

    The application is analogue and digital clocks for public environment receiving time via NTP.  The clock power supply is PoE. Inside the clock is a webserver that is used for setup and configuration etc.

    I am planning to use a ST MCU STM32F107. In the manual for this MCU there is an application block diagram showing the MCU and a TI PHY. This particular example shows a RMII connection using the MCU to create the 50MHz to a DP83848. The application text says "The NS DP83848 is recommended as the input jitter requirement of this PHY. It is compliant with the jitter specification of the MCU." Does the TLK105 have the same good jitter tolerance as th DP83848? Below is a link to the manual, the example is on page 94.

    http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00220364.pdf

    Regards, Per