SLLS530C April   2002  – February 2019 SN65LVDT14 , SN65LVDT41

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      SN65LVDT41 Functional Diagram
      2.      SN65LVDT14 Functional Diagram
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     SN65LVDT41 Pin Functions
    2.     SN65LVDT14 Pin Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Receiver Electrical Characteristics
    6. 6.6  Driver Electrical Characteristics
    7. 6.7  Device Electrical Characteristics
    8. 6.8  Receiver Switching Characteristics
    9. 6.9  Driver Switching Characteristics
    10. 6.10 Typical Characteristics
      1. 6.10.1 Receiver
      2. 6.10.2 Driver
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 SN65LVDTxx Driver and Receiver Functionality
      2. 8.3.2 Integrated Termination
      3. 8.3.3 SN65LVDTxx Equivalent Circuits
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Extending a Serial Peripheral Interface Using LVDS Signaling Over Differential Transmission Cables
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 SPI Propagation Delay Limitations
        2. 9.2.2.2 Interconnecting Media
        3. 9.2.2.3 Input Fail-Safe Biasing
        4. 9.2.2.4 Power Decoupling Recommendations
        5. 9.2.2.5 PCB Transmission Lines
        6. 9.2.2.6 Probing LVDS Transmission Lines on PCB
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Microstrip vs. Stripline Topologies
      2. 11.1.2 Dielectric Type and Board Construction
      3. 11.1.3 Recommended Stack Layout
      4. 11.1.4 Separation Between Traces
      5. 11.1.5 Crosstalk and Ground Bounce Minimization
      6. 11.1.6 Decoupling
    2. 11.2 Layout Examples
  12. 12Device and Documentation Support
    1. 12.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Related Links
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • PW|20
Thermal pad, mechanical data (Package|Pins)
Orderable Information

11.1.4 Separation Between Traces

The separation between traces depends on several factors, but the amount of coupling that can be tolerated usually dictates the actual separation. Low-noise coupling requires close coupling between the differential pair of an LVDS link to benefit from the electromagnetic field cancellation. The traces should be 100-Ω differential and thus coupled in the manner that best fits this requirement. In addition, differential pairs should have the same electrical length to ensure that they are balanced, thus minimizing problems with skew and signal reflection.

In the case of two adjacent single-ended traces, one should use the 3-W rule, which stipulates that the distance between two traces must be greater than two times the width of a single trace, or three times its width measured from trace center to trace center. This increased separation effectively reduces the potential for crosstalk. The same rule should be applied to the separation between adjacent LVDS differential pairs, whether the traces are edge-coupled or broad-side-coupled.

SN65LVDT14 SN65LVDT41 lo_3wrsedt_slls373.gifFigure 27. 3-W Rule for Single-Ended and Differential Traces (Top View)

Exercise caution when using autorouters, because they do not always account for all factors affecting crosstalk and signal reflection. For instance, it is best to avoid sharp 90° turns to prevent discontinuities in the signal path. Using successive 45° turns tends to minimize reflections.