DS25BR204EVK/NOPB

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. 0.1 DS25BR204EVK User Manual Table of Contents Table of Contents ..................................................................................................................... 2 Overview................................................................................................................................... 3 Description................................................................................................................................ 4 Evaluation................................................................................................................................. 5 Truth Tables ............................................................................................................................. 6 Typical Performance ................................................................................................................ 7 Page 2 of 7 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. In addition, the EVK features three FR4 striplines (15 (~38), 30 (~76) and 60 (~152) inches (cm) in length) for exercising device’s signal conditioning features (pre-emphasis and equalization). The purpose of this document is to familiarize the user with the DS25BR204EVK, to suggest test setup procedures and instrumentation to test the device optimally, and to guide the user through some typical measurements that demonstrate the performance of the DS25BR204 in typical applications. Figure 1. Photo of the DS25BR204EVK Page 3 of 7 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 0.625" J8 EQ1 0.625" 0.625" PE2 L L IN2 H OUT2 R17 – R18 Footprints 0.625" J20 H IN2 0.625" IN1 P/N: DS25BR204EVK L PE3 L 0.625" 0.625" J10 SEL_in S/N: VDD VSS H OUT3 PWDN* 0.625" H L 0.4375" 5.25" x 5.25" PCB L2 L1 0.75" 0.625" 1.25" 0.625" J17 0.625" Figure 2. Top Layer DS25BR204EVK Page 4 of 7 L3 0.625" 0.4375" 0.75" 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. Set desired pre-emphasis and/or equalization levels according to Tables 1 and 2. 6. Connect a signal source (signal generator, data source, or an LVDS driver) to the desired INn inputs on the board and adjust the signal parameters (VOH, VOL, VCM) so that they comply with the device input recommendations. 7. Connect an oscilloscope to the selected OUTn outputs and view the output signals with an oscilloscope with the analog bandwidth of at least 5 GHz. Figure 3. DS25BR204 Test Setup Example Page 5 of 7 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. Receive Equalization Truth Table Page 6 of 7 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 3.125 Gbps NRZ PRBS-7 Output Eye Diagram Page 7 of 7 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. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI. Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional restrictions. Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in such safety-critical applications. TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use. TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products Applications Audio www.ti.com/audio Automotive and Transportation www.ti.com/automotive Amplifiers amplifier.ti.com Communications and Telecom www.ti.com/communications Data Converters dataconverter.ti.com Computers and Peripherals www.ti.com/computers DLP® Products www.dlp.com Consumer Electronics www.ti.com/consumer-apps DSP dsp.ti.com Energy and Lighting www.ti.com/energy Clocks and Timers www.ti.com/clocks Industrial www.ti.com/industrial Interface interface.ti.com Medical www.ti.com/medical Logic logic.ti.com Security www.ti.com/security Power Mgmt power.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video RFID www.ti-rfid.com OMAP Mobile Processors www.ti.com/omap Wireless Connectivity www.ti.com/wirelessconnectivity TI E2E Community Home Page e2e.ti.com Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2012, Texas Instruments Incorporated