Advantages of M-LVDS | Disadvantages of M-LVDS

This page covers advantages and disadvantages of M-LVDS and its basics. It mentions benefits or advantages of M-LVDS and drawbacks or disadvantages of M-LVDS.

What is M-LVDS?

LVDS (Low Voltage Differential Signaling) was developed to provide high speed communication in point to point applications. M-LVDS is advanced version of LVDS which supports multipoint applications like RS485. Both LVDS and M-LVDS support differential signaling which uses two wires. The receivers detect data based on voltage difference between two complementary electrical signals. Hence it mininizes emissions and improves immunity against noise.

M-LVDS interface

M-LVDS specifications are defined in TIA/EIA-899 standard. The additional features supported by M-LVDS over LVDS are as follows.
• Controlled transition times
• Increased driver output strength
• Extended common mode range
• Option of fail-safe receivers for bus idle condition

Both LVDS and M-LVDS support differential signaling with low differential voltage swing. As shown, M-LVDS supports half-duplex and full-duplex topologies.

Benefits or advantages of M-LVDS

Following are the benefits or advantages of M-LVDS:
➨It addresses multipoint applications unlike LVDS.
➨It allows high speed links with low power unlike RS485 and CAN.
➨M-LVDS uses higher differential output voltage in comparison to LVDS in order to allow increased load from multipoint bus.
➨M-LVDS supports extended common mode range in comparison to LVDS which allows additional noise in multipoint topology. It offers increased immunity to noise and reduced EM (Electromagnetic) emissions.
➨It supports maximum distance of about 20 to 40 meters. This is higher than LVDS.

Drawbacks or disadvantages of M-LVDS

Following are the drawbacks or disadvantages of M-LVDS:
➨It supports up to 32 nodes on a single bus.
➨It supports typical data rates of about 100 to 200 Mbps which is less than supported by LVDS (i.e. >1Gbps).

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