1. Description

LT8611SX integrates 1-to-1 DP Repeater & HDMI/DVI Level Shifter to simplify system level design and reduce system level cost for applications requiring single DP or HDMI/DVI input and single output device in personal computing system and other emerging digital appliances.

LT8611SX can be configured either as a DP source repeater or as a HDMI/DVI source level shifter by MODE pin. When used as a DP repeater, it repeats four lanes of low-swing AC-coupled differential input signals to a DP receiver, without level shifting, to increase transmission distance. When used as a HDMI/DVI level shifter (default setting), it converts four lanes of low-swing AC-coupled differential input signals to DVI and HDMI compliant open-drain current-mode differential output signals, up to 3 Gbit/s per lane. Each of these lanes provides a level-shifting differential buffer to translate from low-swing AC-coupled differential signaling on the source side, to TMDS-type DC-coupled differential current-mode signaling terminated into 50Ω to 3.3V on the sink side.

Equipped with receiver side equalization of up to 10dB at data rate of 3 Gb/s, LT8611SX can either extends the Displayport signal or level-shifting the dual mode Displayport signal for long distance on both sides.

The LT8611SX provides a single-ended active inverting buffer for voltage translation of the HPD signal from 5V on the sink side to 3.3V on the source side.  And, it provides a channel for level shifting of the DDC channel between 3.3V source-side and 5V sink-side. The chip also integrates a DDC buffer, defined by VESA DisplayPort Interoperability Guideline, for correct operation when connected to a dual mode DisplayPort source device.

The level shifting signal sources typically are from a display source with multi-mode I/O, which supports multiple display standards, e.g., DisplayPort, HDMI and DVI. These I/Os are either too far away from the connector on the board or they do not match with the display devices’ electrical specifications, for e.g. DVI V1.0 or HDMI V1.4b. With LT8611SX, chip set vendors are able to implement such reconfigurable I/Os on multi-mode display source devices, allowing the support of multiple display standards while keeping the number of chip set I/O pins low, or simply repeat the high-speed HDMI, DVI signal on the board or off the board, and give the board designers more freedom on chip placement, and signal propagation distance. Figure 3.1 is a typical application system diagram.

LT8611SX is powered from a single 3.3V power supply consuming a small amount of power and is offered in 4 types of package.

2. Features

• DisplayPort Repeating
• HD-DVI V1.4/DVI V1.0 Level Shifting
• Support HDMI 2.0 4:2:0 format
• DDC Level Shifting
• DDC Buffer Support
• HPD Level Shifting
• Power supply 3.3 V±10 %
• ESD protection up to 3 kV
• Power-saving modes by source-side disablement (using output enable) as well as sink-side detection (using Hot Plug Detect)
 •Transparent operation: no re-timing or software configuration required

3. Applications

• PC Motherboard / Graphics Card
• DP to HDMI/DVI Cable Adaptor
• Digital Set-Top-Box1-to-1
• DP Repeater