DS91C176EVK/NOPB

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. 0.1 DS91C176EVK User Manual Table of Contents Table of Contents ..................................................................................................................... 2 Overview................................................................................................................................... 3 Board Description..................................................................................................................... 4 Configuration Instructions......................................................................................................... 5 Page 2 of 5 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. Photo of the RJ45 to SMA Adapter Board Page 3 of 5 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. One of the RJ45 connector signal pin pairs (3 and 6) are connected to DS91C176 (U1) M-LVDS I/O pins. There is a provision to disconnect the DS91C176 M-LVDS pins and connect the SMA connectors (3 and 6). The JP2 and JP3 connectors connect to the DS91C176 LVCMOS I/O and control pins. 2.5 INCHES 2 1 GND J1 VDD J2 4 5 JP1 7 VDD SIG GND 8 R D SIG 3 6 0.625 INCHES Figure 2. DS91C176EVK Drawing Page 4 of 5 GND 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. If you want to use RJ45 pins 3 and 6 (they are connected to SMA3 and SMA6 connector pads respectively), disconnect the DS91C176 (U1) M-LVDS pins by removing R2 and R3 0-ohm resistors and placing them on the R4 and R5 resistor pads. 3. If you want to use the DS91C176 (U1), apply 3.3 V between the VDD (J2) and GND (J1) power connectors, configure the device as an M-LVDS driver or receiver using the JP3 and use the JP2 to access the DS91C176 LVCMOS I/O pins. For more info on the DS91C176 check its respective datasheet at lvds.national.com. Page 5 of 5 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. 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