The Texas Instruments SN75LVDS84ADGG is a 4-channel LVDS driver from the FlatLink™ series, designed to serialize and transmit parallel data over low-voltage differential signalling links. Typical applications include flat-panel display interfaces, camera modules, and any board-to-board or cable link where you need to push parallel data across a few twisted pairs at low EMI.
The 48-TSSOP package (0.240", 6.10mm width) is a fine-pitch surface-mount part — not something you swap in a parking lot without a hot-air station and a steady hand.
If your system runs a 3.3V LDO, you are fine; if you are on a 2.5V or 5V-only board, you need a local regulator. For industrial or automotive, you would look at the SN65LVDS or SN75LVDS industrial-temperature variants.