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SN75LVCP601: Question about Equalizer characteristics

Hiroaki Masumoto
Expert 1210 points
Part Number: SN75LVCP601

Hello,

My customer has a question about input equalizer characteristics of SN75LVCP601.
I do not have an evaluation board and measurement environment.
Please answer the question from me.

Data sheet of SN76LVCP601 Conditions in Figure 11 and Figure 12 on page 12:
  Case 1 at 6 Gbps
  EQ = 14 dB
  DE = –2 dB
  TP2 Eye Amplitude 240mV (Figure 11. Test Point 2)
  TP3 Eye Amplitude 788.8mV (Figure 12. Test Point 3)

Question :
When the above conditions is changed to EQ = 0dB and DE = 0dB, How is the voltage value at TP3?
I believe that the same voltage as the 240mV of TP2 will be outputted in my expectation.

Best Regards,
Hiroaki Masumoto

  • 0
    TI__Mastermind 43795 points

    Hello,

    The output voltage at TP3 will still be approximately 750 - 800 mV.  The open eye portion of the waveform will be much smaller.  Since the CTLE setting is at 0 dB, the ISI present on the input will be retransmitted at the output.  Even with the linear equalizer portion of the circuit set to 0 dB, the internal LVCP601 datapath has enough widebandwith gain to achieve full output amplitude.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Expert 1210 points

    Lee-san,

    Thank you for your reply.
    I understood and will inform our customer of your information.

    Regards,
    Hiroaki Masumoto