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Original question:

LMH1297: Clarification on .s4p files in LMH1297 IBIS-AMI package

LMH1297: About Input Carrier Detect

sugi shuichi
Prodigy 170 points

Part Number: LMH1297

Hi Ti support,

 The LMH1297 is equipped with Input Carrier Detect. I have a question about this detection function. I'm asking assuming a 1.485 Gbps setting.

 

(Conditions)
 If the input signal amplitude is within the standard, but the data rate is -10% (e.g., 1.34 Gbps) lower, I think an error will be detected.

  Q1) When an error is detected, will the SDI output be muted?

  Q2) In the case of (1), is there a way to output SDI while maintaining the input data rate at 1.34 Gbps?

 

Regards,
Shuichi Sugi

  • 0
    TI__Mastermind 22526 points

    Hi Sugi-san,

    Yes, in this case, I expect that input carrier detect will indicate signal but CDR won't be locked.

    I do not expect SDI output to be muted in this case, but the reclocker will not be locked so the eye will not look as clean. 

    Best,
    J

  • 0 in reply to J
    Prodigy 170 points

    Hi J,

     Thank you for replying for me.

     Actually, we're not interested in transmitting the standard HD-SDI signal (1.485Gbps), but rather a signal with near a data rate.
    We're currently considering whether it's possible to transmit an SDI signal format with a data rate of 1.0Gbps.

     Based on your reply, if the data rate is different, the LMH1297 will generate a receiving error and no signal will be output from the SDI output.

     Is this correct?

    Regards,
    Shuichi Sugi

  • +1 in reply to sugi shuichi
    TI__Mastermind 22526 points

    Hi Sugi-san,

    Actually, CDR will not lock but there is an output on SDI OUT. 

    Best,

    J