3.125 Gbps 1:4 LVDS Buffer/Repeater with Transmit Pre-emphasis and Receive Equalization DS25BR204 Evaluation Kit USER MANUAL Part Number: DS25BR204EVK 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. December 2007 Rev. 0.
DS25BR204EVK User Manual Table of Contents Table of Contents ..................................................................................................................... 2 Overview................................................................................................................................... 3 Description................................................................................................................................ 4 Evaluation....................................
DS25BR204EVK User Manual Overview The DS25BR204EVK is an evaluation kit designed for demonstrating performance of the DS25BR204, a 3.125 Gbps 1:4 LVDS Buffer/Repeater with transmit pre-emphasis and receive equalization. The evaluation kit is comprised of the DS25BR204 with its associated input and output SMA connectors and jumpers to manually configure the switch.
DS25BR204EVK User Manual Description Figure 2 shows the top layer drawing of the PCB with the silkscreen annotations. The 5.25 by 5.25 inch, eight-layer PCB is designed to evaluate the functions of the DS25BR204. 0.75" 1.25" 0.625" L1 0.4375" 0.625" 0.625" L2 J15 J16 0.625" 0.75" 0.625" 0.4375" L3 OUT0 J18 J19 J24 J22 0.625" H 0.625" L PWDN3* PWDN2* PWDN1* PWDN0* 0.625" LOS2* LOS1* L H PE0 J7 IN1 OUT1 DS25BR204 J12 H 0.625" PE1 L L H 0.625" J13 J9 EQ2 H 0.
DS25BR204EVK User Manual Evaluation This section provides recommended test setup procedure for the device evaluation. Figure 3 depicts a typical setup and instrumentation you may use for the device evaluation. 1. Configure the test setup as shown in Figure 3. 2. Select a desired input using J20. 3. Power up the device and desired output(s) using the J18, J19, J20, J22 and J24. 4. Apply + supply (3.3V typical) to the VDD and – supply (ground) to the VSS connectors. 5.
DS25BR204EVK User Manual Truth Tables OUTPUT OUTn, n = {0, 1, 2, 3} CONTROL Pin PEn (J7, J8, J9, J10) State Pre-emphasis Level L OFF H ON Table 1. Transmit Pre-emphasis Truth Table INPUT INn, n = {1, 2} CONTROL Pin EQn (J12, J13) State L H Pre-emphasis Level OFF ON Table 2.
DS25BR204EVK User Manual Typical Performance This section of the User Manual shows a typical eye diagram you can expect to see when evaluating the DS25BR204EVK. Figure 4. DS25BR204 3.
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.
