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DS10CP152 Cross-talk

Other Parts Discussed in Thread: DS10CP152

Hello,

Cross-talk is output from OUT0 in my prototype board using DS10CP152.

When IN0 is a clock signal,Cross-talk is not output.

Is there something that is considered to be the cause of this cross-talk?

Could you give me some advice about this?

○Configuration:
  SEL0:1,SEL1:0 (OUT1:IN0,OUT0:IN1)
  EN0,EN1:1 (OUT1:Enable,OUT0:Disable)
○Input Signal:
  IN0:pseudo-random signal
  IN1:Differential 0V,Common mode voltage 1.34V
○Circuit Connection:
  Decoupling capacitor:10uF,0.1uF,0.01uF
  IN0:LVDS Driver Output
  IN1:Pulse transformaer(The primary side is floating,the secondary side is pulled up with 6.8kΩ and 10kΩ)
  OUT0:LVDS Receiver Input ←Crosstalk is output
  OUT1:Pulse transformaer(The secondary side is floating)

Best regards,
Seishin

  • Hi Seishin,

    What is the value of EN0?

    Please attach a schematic of the DS10CP152 circuit.

    Since the DS10CP152 is a high gain amplifier I do not recommend allowing an input to settle at 0V differential.  I would use some resistors to offset the input voltage slightly to keep internal crosstalk from disrupting the correct device output.

    Regards,

    Lee

  • Dear Lee,

    Thank you for your reply.
    I'm very sorry, I mistook my last post.
    Please ignore it.

    The correction is as follows;
    Error: EN0,EN1:1 (OUT1:Enable,OUT0:Disable)
    Correct: EN0:1,EN1:1 (OUT1:Enable,OUT0:Enable)
    Please confirm it.

    Please find the attached Schematic.(simplified schematic)

    DS10CP152_Seishin.pdf

    Best regards,
    Seishin

  • Hi Seishin,

    Glad your circuit is working now.  Just a note about your schematic - the DS10CP152 already has 100 Ohm input terminations so it is not required to add them externally as well.

    Regards,

    Lee

  • Hi Lee,
     
    I am sorry for the confusion actually the issue is not solved.
    I mean to say there was a mistake in my first post.
     
    >Mistake: EN0,EN1:1 (OUT1:Enable,OUT0:Disable)
    The actual configuration is EN0:1,EN1:1 (OUT1:Enable,OUT0:Enable).
     
    Please let me if there is anything else to be considered.
     
    Best regards,
    Seishin
  • Hi Seishin-san,

    Lee is out of the office this week, so I will jump in to help with responding.

    Please confirm that the 100-ohm termination on IN0 has been removed so that we prevent a double-termination.

    Can you attach a screenshot of OUT0 when it is exhibiting crosstalk and when it is not? My assumption when you say there is cross-talk is that you are seeing some oscillations on a signal that should otherwise be a DC level output. Have you also followed Lee's recommendation to keep the input voltage slightly offset? Doing this is recommended to create a fail-safe such that OUT0 will be in a known state, and thereby less susceptible to oscillations due to crosstalk.

    Michael