Solution:

LVDS : (L)ow (V)oltage (D)ifferential (S)ignaling LVDS is a low swing, differential signaling technology which allows single channel data transmission at hundreds of Megabits per second (Mbps) over 15 meters. Its low swing (about 350mV) and current mode driver outputs create low noise and provide a very low power consumption across frequency. The differential data transmission method used in LVDS is less susceptible to common-mode noise than single -ended schemes. Differential transmission uses two wires with opposite current/voltage swings instead of the one wire used in single-ended methods to convey data information. The advantage of the differential approach is that noise is coupled onto the two wires as common mode (the noise appears on both lines equally) and is thus rejected by the receivers which looks at only the difference between the two signals. The differential signals also tend to radiate less noise than single-ended signals due to the canceling of magnetic fields. And, the current mode driver is not prone to ringing and switching spikes, further reducing noise. Because differential technologies such as LVDS reduce concerns about noise, they can use lower signal voltage swings. This advantage is crucial, because it is impossible to raise data rates and lower power consumption without using low voltage swings. The low swing nature of the driver means data can be switched very quickly. Since the driver is also current mode, very low ?almost flat ?power consumption across frequency is achieved since the power consumed by the load (3.5mA x 350mV, 1.2mW) stays almost constant. ECG adopts LVDS technology in the single board design to meet the high resolution graphic, long distance transmission requirement. These include PCM-5820, PCM-5864, POS-562 & PCN-6351 (build-in LVDS transmisstor). Besides, stand-along PC/104 form factor PCM-3540T (LVDS transmittor) and PCM-3540R (LVDS receiver)