RJ45 to SMA Adapter Board USER MANUAL Part Number: DS91C176EVK NOPB For the latest documents concerning these products and evaluation kit, visit lvds.national.com. Schematics and gerber files are also available at lvds.national.com. January 2008 Rev. 0.
DS91C176EVK User Manual Table of Contents Table of Contents ..................................................................................................................... 2 Overview................................................................................................................................... 3 Board Description..................................................................................................................... 4 Configuration Instructions..........................
DS91C176EVK User Manual Overview The DS91C176EVK consists of two RJ45 to SMA adapter boards developed to complement National Semiconductor’s evaluation boards for which evaluation with CAT5e cable assemblies is sometimes desirable (e.g. DriveCable02EVK, LVDS-18B-EVK, DS25BR100EVK, etc.). In addition, each adapter board features a single DS91C176, an M-LVDS transceiver with Type 2 receiver inputs for optional passing of slow “control” signals over one of the twisted pairs of a twisted pair cable. Figure 1.
DS91C176EVK User Manual Board Description Figure 2 shows the adapter board drawing with the silkscreen annotations. The 2.5 by 3.0 inch, four-layer PCB is designed to bring RJ45 connector signal pins to SMA connectors. The SMA connector annotations correspond to the RJ45 connector pin numbers. There are only 2 SMA pairs installed (1&2 and 7&8) on the board. The end user may install additional SMA connectors.
DS91C176EVK User Manual User Instructions This section provides adapter board user instructions: 1. It is always recommended to terminate unused twisted pairs of a twisted pair cable to minimize EMI, crosstalk, etc., thus termination resistors R6, R7 and R8. Remove resistors connected to the RJ45 pins that you plan to use. For example, remove R7 if you plan to use RJ45 pins 1 and 2 (they are connected to SMA1 and SMA2 connectors respectively). 2.
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