A signal transmission mode proposed by National Semiconductor in 1994 is a level standard. The LVDS interface, also known as the RS-644 bus interface, is a data transmission and interface technology that only appeared in the 1990s. LVDS is a low-voltage differential signal. The core of this technology is to use a very low voltage swing for high-speed differential transmission of data, which can realize point-to-point or point-to-multipoint connection. It has low power consumption, low bit error rate, low crosstalk and For low-emission characteristics, the transmission medium can be a copper PCB connection or a balanced cable. LVDS has been more and more widely used in systems that require high signal integrity, low jitter and common model performance.
LVDS technology is used for simple line driver and receiver physical layer devices and more complex interface communication chipsets. The channel link chipset multiplexes and demultiplexes slow TTL signal lines to provide a narrow high-speed low-power LVDS interface. These chipsets can greatly save the cost of cables and connectors in the system, and can reduce the physical space required by the connectors. The LVDS solution provides designers with new options for solving high-speed I / O interface problems. LVDS provides a milliwatt per gigabit solution for high-bandwidth data transmission applications today and in the future.
The more advanced bus LVDS (BLVDS) is developed on the basis of LVDS. The bus LVDS (BLVDS) is a new series of bus interface circuits based on LVDS technology, specifically designed to implement multipoint cable or backplane applications. It differs from standard LVDS by providing enhanced drive current to handle the double transmission required in multipoint applications. BLVDS has a low-voltage differential signal of about 250mV and a fast transition time. This allows products to achieve high data transfer rates from 100Mbps to over 1Gbps. In addition, the low voltage swing can reduce power consumption and noise to a minimum. The differential data transmission configuration provides +/- 1V common-mode range of the active bus and hot-swap devices.