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Application Report

How to Bridge LVDS/OLDI to HDMI/DVI

Ikechukwu Anyiam
ABSTRACTThis document provides an overview of how to connect an LVDS (Low Voltage Differential Signaling), OLDI
(OpenLDI) or RGB source to an HDMI (High-Definition Multimedia Interface) or DVI (Digital Visual Interface)panel or display. The two-chip solution receives 4 LVDS data pairs and a clock, and output 3 TMDS (Transition
Minimized Differential Signaling) pairs and a clock.

Table of Contents
1 Introduction.............................................................................................................................................................................22 Design Considerations...........................................................................................................................................................33 Design Guidelines...................................................................................................................................................................34 References.............................................................................................................................................................................. 3

List of Figures
Figure 1-1. RGB to DVI/HDMI Conversion.................................................................................................................................. 2
Figure 1-2. LVDS to HDMI Conversion........................................................................................................................................ 2

List of Tables
Table 2-1. LVDS Deserializer Conversion Options...................................................................................................................... 3Trademarks
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Introduction

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1 Introduction
For parallel RGB to DVI/HDMI, the TFP410 by itself can be used. The TFP410 is a DVI compliant bridge/
transmitter that converts up to 24 bits of parallel RGB data to DVI. DVI is equivalent to HDMI without audio, so
this device can also be used to convert to HDMI if the application does not require audio.

Figure 1-1. RGB to DVI/HDMI Conversion
For LVDS to DVI/HDMI, an intermittent LVDS receiver (also known as a deserializer) is needed. The LVDS
deserializer will synchronously deserialize 4 LVDS data pairs carrying 7 bits of data each (including HSYNC,VSYNC, and DE) into 24 bits of parallel RGB data. This output is compatible with the TFP410’s input, so theTFP410 can then be used to convert the parallel RGB input to a DVI/HDMI output.

Figure 1-2. LVDS to HDMI Conversion

2

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Design Considerations

2 Design Considerations
The TFP410 supports pixel clock frequencies in the range of 25 MHz to 165 MHz. However, most LVDS
deserializers do not support a frequency range this wide. If your application is LVDS to HDMI, you should ensurethat the LVDS deserializer and the TFP401 both support the frequency for the desired resolution.
The table below provides some options for LVDS deserializers for LVDS to HDMI conversion:
Table 2-1. LVDS Deserializer Conversion Options
Part Name

Color Depth

Frequency Range [MHz]Clock Edge

DS90CR218A

18bpp (RGB666)

12 - 85

RisingDS90CF366

18bpp (RGB666)

20 - 85

Falling

DS90CR288A

24bpp (RGB888)

20 - 85

RisingDS90CF386

24bpp (RGB888)

20 - 85

Falling

DS90CR486

24bpp (RGB888)

66 - 133

RisingDS90CR484A

24bpp (RGB888)

33 - 112

RisingDS90CF388

24bpp (RGB888)40 - 112

Rising3 Design Guidelines
1. Set the same clock edge for the LVDS deserializer and the TFP410. For example, if using the DS90CR218A,
the EDGE pin on the TFP410 should be pulled high so that data is latched on the rising edge for bothdevices. If used with the DS90CF386, EDGE should be pulled low for falling edge latching.
2. Length match all data and control signals between devices.
3. The incoming TMDS data must be DVI-compliant, and not contain HDMI island data (audio) or deep color(more than 24 color bits).

4 References•Texas Instruments, How to Bridge HDMI/DVI to LVDS/OLDI application report.

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