DS90C387A/DS90CF388A Dual Pixel LVDS Display Interface / FPD-Link
October 2002
DS90C387A/DS90CF388A
Dual Pixel LVDS Display Interface / FPD-Link
General Description
The DS90C387A/DS90CF388A 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 and 3 control bits into 8 LVDS (Low Voltage
Differential Signalling) data streams. At a maximum dual
pixel rate of 112MHz, LVDS data line speed is 784Mbps,
providing a total throughput of 5.7Gbps (714 Megabytes per
second).
The LDI chipset is improved over prior generations of
FPD-Link devices and offers higher bandwidth support and
longer cable drive. To increase bandwidth, the maximum
pixel clock rate is increased to 112 MHz and 8 serialized
LVDS outputs are provided. Cable drive is enhanced with a
user selectable pre-emphasis feature that provides addi-
tional output current during transitions to counteract cable
loading effects.
The DS90C387A transmitter provides a second LVDS output
clock. Both LVDS clocks are identical. This feature supports
backward compatibility with the previous generation of
FPD-Link Receivers - the second clock allows the transmit-
ter to interface to panels using a ’dual pixel’ configuration of
two 24-bit or 18-bit FPD-Link receivers.
This chipset is an ideal means to solve EMI and cable size
problems for high-resolution flat panel applications. It pro-
vides 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 the “Applications Information” section of this
datasheet.
Features
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Supports SVGA through QXGA panel resolutions
32.5 to 112/170MHz clock support
Drives long, low cost cables
Up to 5.7 Gbps bandwidth
Pre-emphasis reduces cable loading effects
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 with FPD-Link
Compatible with ANSI/TIA/EIA-644-1995 LVDS Standard
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Generalized Transmitter Block Diagram
10132002
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© 2002 National Semiconductor Corporation
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