What is important when selecting an LVDS cable driver?
For cable drive applications, there are several important characteristics to consider before selecting a LVDS driver. One of them is the edge rate. Since cable losses will attenuate the signal as well as slow down the transitions, the LVDS drivers with faster falling and rising times will generally be capable of transmitting a signal across longer cables. Devices with larger differential output voltage, VOD, will also have increased margin for driving long cables. Finally, pre-emphasis is a highly desirable feature of an LVDS driver for applications that utilize very lossy cables or large backplane. The pre-emphasis increases the high frequency content of the signal to compensate for the transmission media losses.
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