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.

  • Resolved

CDCVF2505: can this device create a fixed propagation delay of 2nS?

Expert 5650 points
[FAE] Andrew Wang

Part Number: CDCVF2505

Hi Team,

Customer is looking for a solution creating propagation delay 2nS, the reason is if the reference clock to CPU and PCI IC (33MHz) have little time difference, their system works correctly. PCI IC CLK needs about 2nS slower than CPU CLK.

My question is, can we use one CDCVF2505 to achieve this? Or needs a different device to achieve?

Thanks!

Andrew

Expert 5650 points
[FAE] Andrew Wang
  • Genius 17715 points
    Timothy T
    Hello Andrew,

    It appears the CDCVF2505 is designed to operate with +/- 150 ps (typical 0) input to output delay. So true 0-delay. Therefore it's not going to get you the 2 ns propagation delay you would like.

    Consider the LMK03200, LMK04906, or LMK04208 for a device supporting 0-delay with the ability to adjust the actual input to output skew.

    Another option could be to use a buffer/divider like LMK01000/LMK01010/LMK01020. These devices can be placed into /1 mode with some analog delay to get you your ~2 ns propagation delay. The application note SNAA060, Phase Synchronization with Multiple Devices and Frequencies, suggests that propagation delay through LMK01000 is ~600 ps, then analog delay can be turned on with steps of ~142 ps.

    73,
    Timothy
  • Expert 5650 points
    [FAE] Andrew Wang

    In reply to Timothy T:

    Hi Tim,

    Thanks for the crystal clear feedback!!

    Have a good weekend.

    Andrew

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.

All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.

Content on this site may contain or be subject to specific guidelines or limitations on use. All postings and use of the content on this site are subject to the Terms of Use of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms of Use of this site. TI, its suppliers and providers of content reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.

TI Worldwide | Contact Us | my.TI Login | Site Map | Corporate Citizenship | mobile m.ti.com (Mobile Version)

TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs and
embedded processors, along with software, tools and the industry’s largest sales/support staff.

© Copyright 1995-2018 Texas Instruments Incorporated. All rights reserved.
Trademarks | Privacy Policy | Terms of Use