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DS250DF410: Questions regarding use in different applications

Ned Brush
Prodigy 40 points
Part Number: DS250DF410

Hi - I'm considering using the DS250DF410 for the M-PHY protocol and have some questions:

  • What is the minimum frequency (ie low frequency cut-off)?
  • Can this part be used as a "basic" amplifier? In other words, can I pass a PRBS signal with analog gain through to the output. I see that the raw non-retimed data can be used, but are there any other reasons why this part can't be used as an amplifier?
  • The minimum input amplitude required to assert signal detect is specified at 196 mVppd. Related to the question above, if I input a small signal (say ~10mVppd, as an example), will the VGA, X-point, FIR, and driver function with small input amplitude?

Thanks!
Ned

  • 0
    TI__Mastermind 19235 points

    Hi,

    • What is the minimum frequency (ie low frequency cut-off)?
      • There is no low frequency cutoff for the retimer per se
      • The retimer CTLE peak boost happens around 14GHz. it will still work at lower frequencies but its boost will be lower at those frequencies
      • The DS250DF410 retimer supports the data rates below in retimed mode (i.e CDR locked)

     

    PARAMETER

    TEST CONDITIONS

    MIN           TYP           MAX

    UNIT

    Rbaud         Input data rate

     

    Full-rate

    20.2752                                25.8

    Gbps

    Half-rate

    10.1376                                12.9

    Gbps

    Quarter-rate

    5.0688                                 6.45

    Gbps

     

    Can this part be used as a "basic" amplifier? In other words, can I pass a PRBS signal with analog gain through to the output. I see that the raw non-retimed data can be used, but are there any other reasons why this part can't be used as an amplifier?

    • The retimer may be set to CDR bypass raw data mode. In this case the CTLE is applied but CDR is bypassed

    The minimum input amplitude required to assert signal detect is specified at 196 mVppd. Related to the question above, if I input a small signal (say ~10mVppd, as an example), will the VGA, X-point, FIR, and driver function with small input amplitude?

    • First off, you would need to force signal detect asserted by setting channel register 0x14[7]=1
    • The retimer CDR is unlikely to be able to achieve CDR lock for such a small input signal amplitude
    • You may instead try operating the channel in CDR bypass mode and see what output signal amplitude and eye opening you obtain

    Regards,

    Rodrigo Natal