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CDCI6214: Reference clock & default Output clock

user4384716
Prodigy 70 points
Part Number: CDCI6214
Other Parts Discussed in Thread: CDCE6214, LMK61E0-050M

Dear e2e Support,

I have some questions regarding specifications of CDCI 6214

(1) Does CDCI 6214 support Clock generator for Reference Clock?
     I want to avoid to use crystal unit for reference clock.
 

     And, could you inform me recomend Clock generator?


(2) What is Default OUTPUT clock frequency?
    I want to avoid to control by I2C.
    So, I want to kwon Default OUTPUT clock frequency.

    My request
    Power ON -> OUTPUT 100MHz OUTPUT without controlling by I2C.

   
    Regards,

  • 0
    TI__Mastermind 18070 points

    Hi there,

    There's no internal reference clock in CDCI6214. The default configuration uses 25MHz crystal. All the outputs are 100MHz HCSL by default. By the way, CDCE6214 is more recommended as it's a newer part and pin compatible with CDCE6214.

    Regards,
    Hao

  • 0 in reply to Hao Z
    Prodigy 70 points

    Dear Hao-san

    Thank you for your quick responce.

    Could you inform me more detail?

    According to your comment

    >There's no internal reference clock in CDCI6214. The default configuration uses 25MHz crystal

    Does your comment means below?

    "CDCI6214 does not support Differentian Output Oscilator for reference clock."

     I hope use Dirfferencial Output Oscilator for reference clock of CDCI6214.

    (ex LMK61E0-050M   TI 50MHz dirfferencial output Osclator)

    In this case, LMK61E0-050M is connected to No.5 and 6 pins of CDCI6214 and No.4 pin is pulled up.

    Is it impposible?

    With best regards

  • 0 in reply to user4384716
    TI__Mastermind 18070 points

    Hi,

    Yes it's totally acceptable to use an external oscillator. However, in order to use the default EEPROM page 1 to generate 4x100MHz without programming, the oscillator frequency needs to be 25MHz. 

    You can still use 50MHz oscillator with no problem. Just need to program the device.

    Regards,

    Hao

  • 0 in reply to Hao Z
    Prodigy 70 points

    Dear Hao-san

     Thank you for your polite response.

    I understood detail of CDCI6214.

    By the way, do you know option of appopriate 25MHz oscillator?

    I could't find appropriate oscillator from among TI lineup.

    With best regards

  • 0 in reply to user4384716
    TI__Mastermind 18070 points

    Hi,

    Unfortunately we don't have 25MHz oscillators as of now. 

    Regards,
    Hao