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DS64MB201 / input and output amplitude specification

Toshiyuki
Mastermind 7075 points
Other Parts Discussed in Thread: DS64MB201

Hi,

I have some questions for DS64MB201. Would you tell me the information?

Q1

Regarding Vrx_dff, the specification is 0.1V(min)/1.2V(max). Is this same as 0.2(min)-2.4(max)Vpp ?

Q2

Would you provide us the min/max spec for VOD= 800,1000mV(typ)?

Best Regards,

Kato

  • 0
    TI__Mastermind 29655 points
    Hi Kato-san,

    Please see answers to questions below:

    1. Since the definition of the parameter is that Vrx_diff represents "Differential Rx peak to peak voltage," we assume that the range is 0.1 to 1.2 Vpp, not 0.2 to 2.4 Vpp. The unit should be adjusted to show "Vpp" and not just "V."

    2. Unfortunately, we do not have a minimum/maximum spec for VOD = 800 mV and 1000 mV settings thatis guaranteed during production, so I am unable to provide an exact specification min/max value for the output VOD when set to 800 mV or 1000 mV.

    Thanks,

    Michael
  • 0 in reply to Michael Lu (Santa Clara)
    Mastermind 7075 points

    Hi Michael - san,

    Thank you for the reply.

    Regarding "Recommended Operating Conditions" in DS64MB201 datasheet page6, the range of CML Differential Input Voltage is 0 to 2.0Vpp.However, Vrx_diff is 0.1 to 1.2Vpp.What does "the range of CML Differential Input Voltage" mean?

    Best Regards,

    Kato

  • 0 in reply to Toshiyuki
    TI__Mastermind 29655 points

    Hi Kato-san,

    The 0 to 2 Vpp value is the minimum and maximum differential input voltage range that the DS64MB201 can accept.

    However, the V_rxdiff specification aligns with PCIe and SAS/SATA specification. The maximum Tx output voltages at this specification are 1.2 Vpp, and this maximum Tx output corresponds to the maximum Rx differential input that the DS64MB201 can expect at its input. The minimum 0.1 Vpp corresponds to the sensitivity of the SD_TH parameter. Using a 20k to GND means an Electrical Idle Detect Threshold level of ~60 mVpp:

    Therefore, anything less than 100 mVpp may not be enough to keep the channel consistently active.

    Thanks,

    Michael