• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 1 answer
  • Subscribers 34 subscribers
  • Views 1000 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS10CP152 Cross-talk

Seishin
Genius 4135 points
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

  • 0
    TI__Mastermind 43795 points

    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

  • 0 in reply to Lee Sledjeski
    Genius 4135 points

    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

  • 0 in reply to Seishin
    TI__Mastermind 43795 points

    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

  • 0 in reply to Lee Sledjeski
    Genius 4135 points
    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
  • 0 in reply to Seishin
    TI__Mastermind 29655 points
    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