SLLSEA9B February   2012  – August 2015 SN75DP126

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Power Supply Electrical Characteristics
    6. 7.6  Main Link Input Electrical Characteristics
    7. 7.7  DisplayPort Main Link Output Electrical Characteristics
    8. 7.8  HDMI/DVI Main Link Output Electrical Characteristics
    9. 7.9  HPD/CAD/EN Electrical Characteristics
    10. 7.10 AUX/DDC/I2C Electrical Characteristics
    11. 7.11 DisplayPort Main Link Output Switching Characteristics
    12. 7.12 HDMI/DVI Main Link Switching Characteristics
    13. 7.13 HPD/CAD Switching Characteristics
    14. 7.14 AUX/DDC/I2C Switching Characteristics
    15. 7.15 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Implementing the EN Signal
      2. 8.3.2 Hot Plug Detect (HPD) and Cable Adapter Detect (CAD) Description
      3. 8.3.3 OVS Function Description
      4. 8.3.4 AUX and DDC Configuration Details
      5. 8.3.5 Source-Side Main Link EQ Configuration Details
      6. 8.3.6 DP-HDMI Adaptor ID Buffer
      7. 8.3.7 GPU with a Unified AUX/DDC Configuration
      8. 8.3.8 GPU with Separate DDC and AUX Channels
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operating Modes Overview
    5. 8.5 Register Maps
      1. 8.5.1 Link Training and DPCD Description
      2. 8.5.2 Local I2C Interface Overview
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 AC Coupling Capacitors
        2. 9.2.2.2 Configuration Options
        3. 9.2.2.3 Dual Layout for Single or Dual Power Supply
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Analog vs Digital vs High Power
    2. 10.2 Analog Power-Supply Pins and Analog Reference Voltages
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Layer Stack
      2. 11.1.2 Power Plane Do's and Don'ts for Four-Layer Boards
      3. 11.1.3 Differential Traces
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Community Resources
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

9.1 Application Information

The SN75DP126 switches one Dual-Mode DisplayPort (DP++) input to one DP++ sink output or one HDMI/DVI sink output. The HDMI/DVI output has a built-in level translator compliant with DVI 1.0 and HDMI 1.4b and supports resolutions greater than 1920 x 1440 and HDTV deep color at 1080p.

9.2 Typical Application

The SN75DP126 can be used in a dongle implementation to switch from one DP++ Source to one DP++ Sink or one HDMI/DVI Sink.

SN75DP126 typapp_1.gifFigure 27. Typical Dongle Implementation

9.2.1 Design Requirements

The design requirements for this application are listed in Table 8.

Table 8. Design Requirements

Design Parameter Example Value
Source DP++
Sink DP++
Sink Priority High (DP)
OVS Low
PRE Low
EQ Low
SLEW Low
VCC 9 V

9.2.2 Detailed Design Procedure

9.2.2.1 AC Coupling Capacitors

The DP link is an AC-coupled interface. AC coupling capacitors must be placed between the Source and the DP126.

SN75DP126 AC_coupling_capacitors_sllsea9.gifFigure 28. Source-to-DP126 AC Coupling Capacitors

AC coupling capacitors are required from the DP126 output to the DP Sink as well.

SN75DP126 AC_coupling_capacitors_2_sllsea9.gifFigure 29. DP126 Output to the DP Sink AC Coupling Capacitors

9.2.2.2 Configuration Options

It is recommended to leave place holders on the Configuration I/O for further fine tuning.

SN75DP126 config_options_sllsea9.gifFigure 30. Configuration Options

9.2.2.3 Dual Layout for Single or Dual Power Supply

The SN75DP126DS requires dual power supply whereas the DP126SS requires only one power supply. The design can have options to use either one with minor hardware changes

SN75DP126 duel_power_supply_sllsea9.gifFigure 31. Power Supply Layout

9.2.3 Application Curves

SN75DP126 Fig23_SLLSEA9.png
Figure 32. Main Link Input with 22-inch Trace;
DisplayPort Sink
SN75DP126 Fig25_SLLSEA9.png
Figure 34. Main Link Input with 22-inch Trace; TMDS Sink
SN75DP126 Fig24_SLLSEA9.png
Figure 33. SN75DP126 Output; 22-inch Input Trace;
15 dB EQ Setting; DP Sink
SN75DP126 Fig26_SLLSEA9.png
Figure 35. SN75DP126 Output; 22-inch Input Trace; 15 dB EQ Setting; TMDS Sink