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PI3HDMI511A
PI3HDMI511A HDMI Application Information
Table of Contents
1 Introduction .............................................................................................................................. 2
2 External Component Requirements ....................................................................................... 2
2.1 AC Coupling Capacitors on Output Main Link ....... .. .. ... .. .. .. ........... .. ........... ........... .. .......... 3
2.2 Pull-up Resistors on DDC Channel ..................................................................................... 3
2.3 Pull-up Resistor on HPD Channel ....................................................................................... 3
3 Layout Design Guideline .......... .. ... .. .. ........... .. .. .. ... .. .. .. .. .. ........... .. ... .. .. .. .. .. ... .. ........... .. .. .. .. ... ... 3
4 References ................................................................................................................................ 3
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1 Introduction
PI3HDMI511A is an HDMI 1.4 re-driver for source application. It can re-drive TMDS signals coming from dual-mode
DP source or HDMI source. As HDMI data rate can be faster than 2.2Gbps, signal integrity is critical. Source
termination is therefore implemented in PI3HDMI511A to high-speed transmission. External components in typical
application circuit and layout guideline are described in this application information.
2 External Component Requirements
PI3HDMI511A is designed to accept AC-coupled as well as DC-coupled main link signals.
Figure 1: PI3HDMI511A HDMI Source Application
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2.1 AC Coupling Capacitors on Output Main Link
For dual-mode DP source, AC coupling capacitors should be placed before where TMDS signals enter PI3HDMI511A
if signals from the dual-mode DP source are DC coupled.
2.2 Pull-up Resistors on DDC Channel
Each of SCL and SDA is pulled up to 3.3V via a 20kΩ resistor to create a high voltage level for dual-mode DP source.
The 2kΩ pull-ups to 5V are the requirement of HDMI Specification Version 1.4. As 5V-to-3.3V level shifter is
implemented in the design, external FET is not required.
2.3 Pull-up Resistor on HPD Channel
As HPD_SRC of PI3HDMI511A is an open drain buffer design, external pull-up should be implemented.
3 Layout Design Guideline
Layout guideline especially for high-speed transmission is critical. Please refer to PIxxxx High Speed Layout Guideline,
AN345, for detailed recommendations.
4 References
(1) VESA DisplayPort Standard Version 1 Revision 2, Video Electronics Standards Association, January 5, 2010
(2) VESA DisplayPort Dual-Mode Standard Version 1, Video Electronics Standards Association, February 10,
2012
(3) VESA DisplayPort Interoperability Guideline Version 1.1a, Video Electronics Standards Association,
February 5, 2009
(4) High-Definition Multimedia Interface Specification Version 1.4b, HDMI Licensing, LLC, October 11, 2011
(5) PCI Express Board Design Guidelines Draft, Intel Corporation, June 2003
