Part Number: LVDS
Function: Low-Voltage Differential Signaling ( LVDS )
Manufacturer: Agilent Technologies
Low Voltage Differential Signaling (LVDS) defines a reduced swing, differential I/O technology for high-speed interface.
Application Note 1382-6 by Stephen Kempainen, National Semiconductor Who Should Read This Application Note? Digital designers utilizing lowvoltage differential signaling (LVDS) for high-speed data transmissiom. LVDS Provides Higher Bit Rates, Lower Power, and Improved Noise Performance Due to the Internet’s tremendous growth, data transfers are increasing dramatically in all areas of communications. In addition, data streams for digital video, HDTV, and color graphics are requiring higher and higher bandwidth. The digital communications deluge is the driving force for high-speed interconnects between chips, functional boards, and systems. The data may be digital, but it is analog LowVoltage Differential Signaling (LVDS) that designers are choosing to drive these high-speed transmission lines. LVDS’s proven speed, low power, noise control, and cost advantages are popular in point-to-point applications for telecommunications, data communications, and displays. LVDS uses high-speed analog circuit techniques to provide multi-gigabit data transfers on copper interconnects. Wherever you need high-speed data transfer (100 Mb/s and higher), LVDS offers a solution. There are many applications in many market segments that use LVDS for data transmission.
• stackable hubs for data communications • wireless base stations and ATM switches in telecommunications • flat-panel displays and servers in the computer market • peripherals like printers and digital copy machines • high-resolution displays in industrial applications • flat-panel displays in the automotive market In these applications, high-speed data moves within and between systems. Moving data within a system (intrasystem data transfer) is the main use for LVDS solutions today. Moving information between systems (intersystem data transfer) requires standard communication protocols such as IEEE 1394, Fibre Channel, and Gigabit Ethernet. Since the hardware and software overhead for intersystem protocols is too expensive to use for intrasystem data transfers, a simple and low-cost LVDS link is an attractive alternative. Thus, LVDS solutions move information on a board, between boards, modules, shelves, and racks, or box-to-box. The transmission media can be copper cables or printed circuit board (PCB) traces. In the future, LVDS will also carry protocols for inter-system communication. Table of Contents LVDS Provides Higher Bit Rates, Lower Power, and Improved Noise Performance . . 1 Generic LVDS . . 2 Multiple Technologies and Supply Voltages . . 3 Gigabits at Milliwatts 4 Flat Supply Current vs. Operating Frequency . 6 Low Electromagnetic Interference . 7 Cost Benefits . . 8 Many Channels per Chip . […]