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Original question:

AM5708: OSC0 recommended products

LMK6C: Are there any LVCMOS (1.8V) 20MHz output products?

hiroshi.yamada
Intellectual 445 points
Part Number: LMK6C
Other Parts Discussed in Thread: AM5708, CDC6C

Tool/software:

To use LMK6C with the AM5708, LVCMOS (1.8V) is required.

Does a 20MHz product exist?

I received a comment in another post that LMK6C can be used with the AM5708, but unfortunately there is no LVCMOS (1.8V) at 20MHz, so I would like to confirm.

Hiroshi Yamada

  • 0
    TI__Genius 12150 points

    Hi Hiroshi, 

    If you'd like, I can put you in contact with our product marketing team to discuss releasing a 1.8V 20MHz variant of LMK6C. We have also released a 20MHz variant of CDC6C (CDC6CE020000ADLXR) which supports a flexible supply voltage of 1.8V - 3.3V. CDC6C is our latest low-powered LVCMOS oscillator family. Compared to LMK6C it is lower power and available in smaller package sizes. The jitter performance is slightly worse but it should still be able to meet the AM5608 requirements. 

    Regards, 

    Connor 

  • 0 in reply to Connor Lewis
    Intellectual 445 points

    Hi Connor,

    Thank you for your comment.

    I found out about the 20 MHz CDC6C (CDC6CE020000ADLXR) after posting on the forum.

    I was wondering about one thing.

    The AM5708 frequency accuracy is ±50 ppm because it uses Ethernet RGMII.

    The CDC6C frequency tolerance is ±50 ppm over 10 years, which is within the standard, but I thought there was no margin.

    Is this okay?

    I would like to use it as a basic idea, so I would appreciate any comments.

    Best regards,

    Hiroshi Yamada

  • 0 in reply to hiroshi.yamada
    TI__Genius 12150 points

    Hi Hiroshi, 

    The CDC6C frequency accuracy spec has some margin, so in practice it shouldn't get too close to +/-50 ppm. I wouldn't expect there to be any issues with using it for ethernet RGMII. 

    Regards, 

    Connor 

  • 0 in reply to Connor Lewis
    Intellectual 445 points

    Hi Connor,

    Thank you for your comment.

    I understand.

    I understand that the contents listed in the data sheet are the numerical specifications but in terms of design,

    decisions are made based on the numerical values, and if the values are at the very limit then it is decided that there is no margin.

    I received a comment saying that it should be fine, so I would like to use it.

    Thank you very much.

    Hiroshi Yamada