SNLS144K June   2005  – March 2024 DS40MB200

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Ratings
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Switching Characteristics
    7. 5.7 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 CML Inputs and EQ
      2. 7.3.2 Multiplexer and Loopback Control
      3. 7.3.3 CML Drivers and Pre-Emphasis Control
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

8.2.3 Application Curves

Figure 8-4 through Figure 8-9 show how the signal integrity varies at different places in the data path. These measured locations can be referenced back to the labeled points provided in Figure 8-3.

  • Point (A): Output signal of source pattern generator
  • Point (B): Input to DS40MB200 after 25 inches of FR4 trace from source
  • Point (C): Output of DS40MB200 driver
  • Point (D): Signal after 40 inches of FR4 trace from DS40MB200 driver

The source signal is a PRBS-7 pattern at 4 Gbps. For the long output traces, the eye after 40 inches of output FR4 trace is significantly improved by adding –9 dB of pre-emphasis.

DS40MB200 Eye Measured at Point (A)Figure 8-4 Eye Measured at Point (A)
DS40MB200 Eye Measured at Point (C), Pre-Emph = 0 dBFigure 8-6 Eye Measured at Point (C), Pre-Emph = 0 dB
DS40MB200 Eye Measured at Point (C), Pre-Emph = –9 dBFigure 8-8 Eye Measured at Point (C), Pre-Emph = –9 dB
DS40MB200 Eye Measured at Point (B)Figure 8-5 Eye Measured at Point (B)
DS40MB200 Eye Measured at Point (D), Pre-Emph = 0 dBFigure 8-7 Eye Measured at Point (D), Pre-Emph = 0 dB
DS40MB200 Eye Measured at Point (D), Pre-Emph = –9 dBFigure 8-9 Eye Measured at Point (D), Pre-Emph = –9 dB