1FEATURES

2• Complies with OpenLDI Specification for

Digital Display Interfaces

• 32.5 to 112/170MHz Clock Support for

DS90C387, 40 to 112MHz Clock Support for

DS90CF388

• Supports SVGA through QXGA Panel userResolutions

• Drives Long, Low Cost Cables

• Up to 5.38Gbps Bandwidth

• Pre-Emphasis Reduces Cable Loading Effects

• DC Balance Data Transmission Provided by

Transmitter Reduces ISI Distortion

• Cable Deskew of +/−1 LVDS Data Bit Time (up

to 80 MHz Clock Rate) of Pair-to-Pair Skew at FPDReceiver

Inputs; Intra-Pair Skew Tolerance of

300ps

• Dual Pixel Architecture Supports Interface to

GUI and Timing Controller; Optional Single

Pixel Transmitter Inputs Support Single Pixel

GUI Interface

• Transmitter Rejects Cycle-to-Cycle Jitter

• 5V Tolerant on Data and Control Input Pins

• Programmable Transmitter Data and Control

Strobe Select (Rising or Falling Edge Strobe)

• Backward Compatible Configuration Select eyewith

FPD-Link

• Optional Second LVDS Clock for Backward

Compatibility w/ FPD-Link

• Support for Two Additional User-Defined

Control Signals in DC Balanced Mode

• Compatible with ANSI/TIA/EIA-644-1995 LVDS

Standard

DESCRIPTION

The DS90C387/DS90CF388 transmitter/receiver pair

is designed to support dual pixel data transmission

between Host and Flat Panel Display up to QXGA

resolutions. The transmitter converts 48 bits (Dual

Pixel 24-bit color) of CMOS/TTL data into 8 LVDS

(Low Voltage Differential Signalling) data streams.

Control signals (VSYNC, HSYNC, DE and two userResolutions

defined signals) are sent during blanking intervals. At

a maximum dual pixel rate of 112MHz, LVDS data

line speed is 672Mbps, providing a total throughput of

5.38Gbps (672 Megabytes per second). Two other

modes are also supported. 24-bit color data (single

pixel) can be clocked into the transmitter at a maximum rate of 170MHz. In this mode, the

transmitter provides single-to-dual pixel conversion,

and the output LVDS clock rate is 85MHz maximum.

The third mode provides inter-operability with FPDReceiver

Link devices.

The LDI chipset is improved over prior generations of

FPD-Link devices and offers higher bandwidth

support and longer cable drive with three areas of

enhancement. To increase bandwidth, the maximum

pixel clock rate is increased to 112 (170) MHz and 8

serialized LVDS outputs are provided. Cable drive is enhanced with a user selectable pre-emphasis

feature that provides additional output current during

transitions to counteract cable loading effects. DC

balancing on a cycle-to-cycle basis, is also provided

to reduce ISI (Inter-Symbol Interference). With pre- emphasis and DC balancing, a low distortion eyewith

pattern is provided at the receiver end of the cable. A

cable deskew capability has been added to deskew

long cables of pair-to-pair skew of up to +/−1 LVDS

data bit time (up to 80 MHz Clock Rate). These three

enhancements allow cables 5+ meters in length to be

driven. This chipset is an ideal means to solve EMI

and cable size problems for high-resolution flat panel

applications. It provides a reliable interface based on

LVDS technology that delivers the bandwidth needed

for high-resolution panels while maximizing bit times,

and keeping clock rates low to reduce EMI and

shielding requirements. For more details, please refer

to Applications Information.