DS91M125EVK/NOPB

DS91M125 125 MHz 1:4 M-LVDS Repeater with LVDS Input Evaluation Kit USER MANUAL Part Number: DS91M125EVK 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 August 11, 2008 Rev. 1.0 1 © 2008, National Semiconductor Corp. Overview The purpose of this document is to familiarize you with the DS91M125 evaluation board, suggest the test setup procedures and instrumentation, and to guide you through some typical measurements that will demonstrate the performance of the device. The board enables the user to examine performance and all functions of the DS91M125 as a standalone device. The DS91M125 is a high-speed 1:4 M-LVDS repeater with an LVDS input designed for multipoint applications with multiple drivers or receivers. The device conforms to TIA/EIA-899 standard. It utilizes M-LVDS technology for low power, high-speed and superior noise immunity. Description Figure 1 below represents the top layer drawing of the board with the silkscreen annotations. It is a 2.5 x 3 inch 4 layer printed circuit board (PCB) that features a single DS91M125 (U2) device. Figure 1 - DS91M125EVK Top View Drawing August 11, 2008 Rev. 1.0 2 © 2008, National Semiconductor Corp. DS91M125 Evaluation in a Point-to-Point Link The following is a recommended procedure for using and evaluating the DS91M125EVK. Figure 2 depicts a typical setup and instrumentation used. 1. Select a single DS91M125 evaluation board. 2. Apply the power to the board (3.3 V typical) between J3 and J4 power tabs, observe the value of ICC, and compare it with the expected value (refer to the datasheet) to ensure that the devices are functional. 3. Enable one of the U2 driver outputs. This is accomplished by setting the DE0-3 pin to VDD (JP3-6). 4. Connect a signal source to the driver input (DI+, DI-). The signal needs to be an LVDS/MLVDS/CML/LVPECL compliant signal. Refer to the DS91M125 datasheet for the receiver input compatibility. 5. Connect one of the U2 outputs (A0-3/B0-3) to an oscilloscope and observe the waveforms. Figure 2 – DS91M125 Test Setup August 11, 2008 Rev. 1.0 3 © 2008, National Semiconductor Corp. Figure 3 shows an eye diagram acquired at the output of the DS91M125 driver loaded with a 100-ohm resistor. The generator connected to the driver input simulated a 100 Mbps PRBS-7 NRZ. Figure 3 – DS91M125 Output August 11, 2008 Rev. 1.0 4 © 2008, National Semiconductor Corp. ENERCON - BILL OF MATERIALS TITLE: Main Product: 1 PCB Rev: Rev By: Rev Date: PL Number: Z3252-01 1 BJ Responsible Eng/Mgr: DS91M125 PCBA, DS91M125EVK, ROHS Item Part Type NATIONAL SEMICONDUCTOR PCBA, DS91M125EVK, ROHS Part Number/Value Mfg NoSub Description Qty PL Status: Released Creator: Creation Date: Arlene Fox 03/14/08 Ref Des SMT 04/30/08 Notes 1 Rev P-06540R0 ENERCON 0 Z3211-04 ENERCON LABEL, MADE IN U.S.A. 1 DS91M125TMA NAT 125MHz 1:4 M-LVDS Repeater, SOIC16 1 X U2 0 ERJ-2RKF1000 PANA 100 Ohm 1/16W ±1% 0402 100ppm, Pb-Free 1 X R13 0 9 CAP 06035C103KAT AVX .01µF, 50V, ±10%, 0603, Ceramic, X7R, Pb-Free 2 X C7,10 0 10 CAP 0603YC104KAT AVX .1µF, 16V, ±10%, 0603, Ceramic, X7R, PbFree 2 X C5,9 0 11 CAP TAJA106K016 AVX 10µF, 16V, ±10%, A-Case, Tantalum, PbFree 1 X C8 0 13 CONN 1287 KEYSTONE Faston, Male, .250", Pb-Free 2 J3,4 0 14 CONN 142-0701-851 EMERSON SMA, Jack Receptacle, 50 OHM, Pb-Free SMA13-22 0 15 CONN 15-29-1024 MOLEX Jumper Shunt, 2p, Gold, Pb-Free 4 16 CONN TSW-103-07-G-S SAMTEC Header, 3p, Male, .100"sp, Gold, Pb-Free 4 T-06544R0 ENERCON STENCIL FABRICATION, BOTTOM, DS91M047EVK/DS91M1... 1 20 REF C-06541R0 ENERCON FAB DWG, DS91M047EVK/DS91M124EVK/DS91M125EVK 0 21 REF C-06542R0 ENERCON PALLET DWG, DS91M047EVK/DS91M124EVK/DS91M125EVK 0 22 REF S-06539R0 ENERCON SCHEMATIC, DS91M047EVK/DS91M124EVK/DS91M125EVK 0 2 3 SUBASY Apply to bottom of PCBA 1 4 5 IC 6 7 RES 8 12 10 Use on JP3,4,5,6 Pins 2&3 JP3,4,5,6 0 0 17 18 STENCL 0 19 23 10:32:55 AM, 06/17/08 Confidential and Proprietary. This document is considered uncontrolled unless stamped otherwise. Page 1 of 2 ENERCON - BILL OF MATERIALS TITLE: Main Product: NATIONAL SEMICONDUCTOR PCBA, DS91M125EVK, ROHS PL Number: Rev: Rev By: Rev Date: Z3252-01 1 Responsible Eng/Mgr: DS91M125 PCBA, DS91M125EVK, ROHS BJ 04/30/08 PL Status: Released Creator: Creation Date: Arlene Fox 03/14/08 Notes: DO NOT STUFF: U1 M1-10 JP1,2 R1-12,14,15 T1-2,7,15,17,19,21,23,3,11,12,16,18,20,22,24 J1,2 C1,2,3,4,6 SMA1-12 10:32:55 AM, 06/17/08 Confidential and Proprietary. This document is considered uncontrolled unless stamped otherwise. Page 2 of 2 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. 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