• State TI Thinks Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 4 answers
  • Subscribers 20 subscribers
  • Views 392 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

CDCM9102: Performance of OSCOUT pin

Tamio Yokokura
Expert 3630 points
Part Number: CDCM9102

When OS1=1 and OS2=2, OSCOUT is enabled in LVPECL mode. In this  case, what is the performance (Duty, Jiter and so on) of the clock signal from OSCOUT pin?

Thanks

Tamio

  • 0
    TI__Mastermind 18070 points

    Hi Tamio, 

    OSCOUT is the LVCMOS format of input, it's single ended and cannot be LVPECL. Table 3 is talking about the formats of OUT0 and OUT1. Performance of various output formats is listed in table 7.5 and 7.6.

    Regards,

    Hao

  • 0 in reply to Hao Z
    TI__Expert 3630 points

    Hi, Hao,

    Thank you for supporting.

    According to the following Table 3, to be enabled OSCOUT, OS1 and OS2 must to be configured to 1 and 1, but the clock output is configured to LVPECL mode. If the clock output is configured to LVCMOS mode or LVDS mode, OSCOUT can not use. Is this understanding correct?

    As for the performance of OSCOUT, which item in list 7.5 and 7.6 should I confirm? Please clarify the item I should confirm.

    7.5 Electrical Characteristics

      • LVCMOS Input
      • CRYSTAL Characteristics (XIN)
      • Clock output Buffer (OUTPUT mode=LVPECL)
      • Clock output Buffer (OUTPUT mode=LVDS)
      • Clock output Buffer (OUTPUT mode=LVCMOS)

    7.6 Timing Requirements

      • LVCMOS OUTPUT mode
      • LVPECL OUTPUT mode
      • LVDS OUTPUT mode

    Thanks

    Tamio

  • 0 in reply to Tamio Yokokura
    TI__Mastermind 18070 points

    Hi Tamio,

    Yes that is correct. 

    Jitter performance can be found here:

    Duty cycle and other AC specs can be found in table 7.5

    Regards,
    Hao

  • 0 in reply to Hao Z
    TI__Expert 3630 points

    Hi, Hao,

    Is your meaning that the jitter specification of OSCOUT pin is depending on the OUTPUT mode selected by OS1 and OS2? And, is the AC specification also depending on the OUTPUT mode? 

    Please show it clarify.

    Thanks

    Tamio

  • 0 in reply to Tamio Yokokura
    TI__Mastermind 18070 points

    No I meant OUT0 and OUT1. I'm afraid that the additive jitter of the buffer for OSCOUT is not available.

    Regards,
    Hao

  • 0 in reply to Hao Z
    TI__Expert 3630 points

    Hi, Hao,

    I want to know the specification of OSCOUT pin as shown the following figure

    The only thing I understood is that OSCOUT is the output of LVCMOS. As for the specification of OSCOUT pin, I can't understand any more even if I checked the other device (CDCM6xxx series). 

    Is there any specification for OSCOUT pin? 

    Thanks

    Tamio

  • 0 in reply to Tamio Yokokura
    TI__Mastermind 18070 points

    Hi Tamio,

    I'm afraid we don't have any spec for OSCOUT output. It's a simple LVCMOS buffer for the input and we don't expect it to be used as high performance clock source.

    Regards,
    Hao