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DS250DF230: TI replacement device for ADN2905ACPZ

JH Shin
Guru 12575 points

Part Number: DS250DF230
Other Parts Discussed in Thread: DS125DF111, DS110DF111, DS125DF410, DS110DF410, , TLK10002

Hello,

My customer is looking for a replacement product for the ADN2905ACPZ.

Can you please recommend a suitable TI product ?

Thank you.

JH

  • 0
    TI__Mastermind 42028 points

    Hi JH,

    Can you share more about the customer's application?  What data rates is this device being used for?  What is the key functionality they require from it?

    Thanks,
    Drew

  • 0 in reply to Drew Miller1
    Guru 12575 points

    Hi Drew,

    Thanks for your reply.

    The customer is designing wired network equipment.

    The customer is looking for a replacement product that can replace the function as much as possible with the discontinued ADN2905ACPZ used previously.

    Regards,

    JH

  • 0 in reply to JH Shin
    TI__Mastermind 42028 points

    Hi JH,

    It looks like DS125DF111 is the closest replacement we have.  With that said, it's important for us to understand the data rates that the customer is using and if the data needs to be retimed at these rates.  For example, if the customer using 614.4 Mbps with ADN2905, then the DS125DF111 would need to operate in CDR bypass mode to support this.

    Additionally, my recommendation of DS125DF111 is driven by a need to support 3.072 Gbps and 6.144 Gbps CPRI.  If the customer is just working on Ethernet systems, they likely just need support for 1GbE and 10GbE.  In this case, DS110DF111 may be a good choice as well.

    If customer can use a 4 channel device, DS110DF410 and DS125DF410 are also worth considering.

    Thanks,

    Drew

  • 0 in reply to Drew Miller1
    Guru 12575 points

    Hi Drew,

    Thanks for your help.

    Here is the customer's response.

    It would be better if it could support both CPRI and Ethernet, but device that support only 1/10GbE is possible.
     
    We are considering a portable product that can check the line status, so we prefer 1ch because we prioritize low power consumption.
     
    The product you recommended doesn't seem to have anything to check the PRBS error other than Lock, is that correct?

    Regards,

    JH

  • 0 in reply to JH Shin
    TI__Mastermind 42028 points

    Hi JH,

    Thanks for clarifying the use case.

    Yes this is correct, the devices I recommended can generate a PRBS pattern provided that they have CDR lock, but cannot check a PRBS pattern.

    Our 25G retimers such as DS250DF230 support PRBS pattern checking.  However, this device supports 19.6-25.8 Gbps and divide by 2/4 subrates.  This means that the lowest data rate supported by our DS250DF230 in CDR mode is 4.9 Gbps.  The device can pass through lower data rates using a CDR bypass mode and apply CTLE to these data rates, but it is not possible to check a PRBS pattern without CDR lock.

    Thanks,

    Drew

  • 0 in reply to Drew Miller1
    Guru 12575 points

    Hi Drew,

    The customer found the TLK10002 on TI website.

    This product seems to have a PRBS error count feature. Any reason for recommending the DS series instead of the TLK10002?

    Thanks,

    JH

  • 0 in reply to JH Shin
    TI__Mastermind 42028 points

    Hi JH,

    This product is a SERDES device.  My understanding is that the customer is looking for a retimer device, which are part of our DS series.  Please let me know if customer thinks TLK10002 is a viable option.

    Thanks,

    Drew