Data Sheet - Mouser Electronics
Contents
1. Function Switch Indicator Switch and Comments Indicator State Rate Select RateO Rate0 Both switches off This is the setting for Rate1 Rate1 Both indicat automatic rate detect li E ISIS The rate selection ignis green switches can also be set to match the data rate input For a 1 4835 Gb s signal as described here Rate 0 can be off and Rate 1 on Bypass Autobypass Bypass Aut Bypass Switch off LMH0346SQ Reclocker obypass Indicator light off in normal autobypass mode Output Mute OP Mute None Switch off LMH0346SQ Reclocker output is active Serial Clock Output SCO_EN SCO_EN Switch off This test will produce the Enable Indicator light off same results regardless ett ao of the state of the SCO_EN SD HD Indication None SD_HD Indicator green The indicator will be red if indicating HD or a 270 Mb s signal is 3 Gb s signal or used no signal detected Lock Detection None LOCK DET Indicator on The indicator will be off if green a non supported data indicating that the rate is used LMH0356 Reclocker is locked to the incoming signal SD346EVK User Manual 9 of 10 Rev 1 0 2008 National Semiconductor Corp Sample Output Eye Diagram The output eye diagram shown in Figure 3 is typical of the output eye diagrams obtained during testing of the SD346EVK Eye Auto 188 mV per Diy A A A Rise Time 88 1 ps Fall Time 88 1 ps Data Unit Intrvl 674 1 ps e Amp mo Center 22 m Jitter PP 11 5ps2. DIP switch The second header is located to the right of the DIP switches This header is meant to provide access for remote control of the LMH0346SQ SDI Reclocker When this header is used the DIP switches should all be set in the open position and no jumpers should be installed on the control header The connections for this header are described in the schematic for the SD346EVK PC board It is recommended that this SD346EVK User Manual 3 of 10 Rev 1 0 2008 National Semiconductor Corp header only be used for advanced control applications and only by users familiar with the operation of the LMH0346SQ SDI Reclocker LED indicators are provided near the top of the board to indicate the state of the control inputs and the indicator outputs of the LMH0346SQ SDI Reclocker The LED states and their meanings are summarized in Table 1 Table 1 Control and Indicator Function Summary Function Switch Indicator Switch On Switch Off Function and Function and Indication Indication Rate Select RateO RateO Rate line pulled Rate line pulled Rate Rate1 to logic 1 to logic 0 Indicator light Indicator light turns red turns green Bypass Autobypass Bypass Autobypass Bypass LMH0346SQ LMH0346SQ reclocker forced reclocker in to bypass mode normal Indicator on ONT D mode red Indicator off Output Mute O P Mute None LMH0346SQ LMH0346SQ reclocker output reclocker output is muted is active
3. schematic for the board must be removed This permits evaluation of the operation of the LMH0346SQ SDI Reclocker with an external reference SMBus Connector The LMH0346SQ SDI Reclocker can be controlled via a 2 wire bus very similar to the standard SMBus This mode of operation was designed for factory use only Typical Output Waveform A test waveform can be readily generated and used to verify proper operation of the SD346EVK In order to generate this output waveform the following setup procedure should be used Test Setup The test setup used for testing the SD346EVK board is shown in Figure 2 Note that the test setup includes a SyntheSys Research BERTScope as a signal generator eye diagram measurement device and bit error rate test receiver Other equivalent instruments could be used for these measurements The equipment used for testing the SD346EVK is listed in Table 2 SD346EVK User Manual 5 of 10 Rev 1 0 2008 National Semiconductor Corp T CK CK BERTScope Clock In Clock Out Data Out Data In Data Data Data Data UTIFlex Cable UTIFlexCabl UTIFlex Cable SD346SQ EVK Board Simeg Cable SDI SDO SDI SDO SCO SCO vcc_I VCC GND SMBus Ta HP E3610A DC Power IS SMBus Controller Cable HP8593E Spectrum S Analyzer Supply PC with SMBus Controller and Serial Port Figure 2 Test setup for the SD346EVK board SD346EVK User Manual 6 of 10
4. 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 Inform
5. 11 5 Min 11 5 Max 11 5 Mean 0 0 Sigma a 3 Running Pan x 00 00 22 B has C gt a Local il Gen PRBS 7 1 483 50 Mbit s Det NIA 1 483 50 Mbit s BER Disabled Figure 3 Typical output eye diagram for 1 4835 Gb s Summary The SD346EVK is a simplified four layer PC board designed to facilitate the evaluation of the LMH0346SQ SDI Reclocker In concept it is a simple input output board with the LMH0346SQ SDI Reclocker in the signal path This manual has described the features of the PC board and its operation For additional information please see www national com sdi SD346EVK User Manual 10 of 10 Rev 1 0 2008 National Semiconductor Corp IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries Tl 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 Tl 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 TTS standard warranty Testing and other quality control techniques are used to the extent Tl deems necessary to support
6. 3 3 VDC to 1 the LMH0346SQ SDI Reclocker alone and 2 the remainder of the circuitry on the SD346EVK board The dual supply configuration permits measurement of the current drawn by the LMH0346SQ SDI Reclocker independent of the other devices on the board if desired The two supplies may be connected together if desired using either an external jumper or the onboard header between the 3 3 V power supply terminals The power supply is not regulated on the SD346EVK board so the effects of power supply variations can be evaluated It is recommended that the maximum supply voltage rating of the LMH0346SQ 4 VDC not be exceeded Controls and Indicators The control lines of the LMH0346SQ SDI Reclocker can be controlled by various means using the SD346EVK The primary method for controlling these lines is the DIP switches located on the SD346EVK board The DIP switches are labeled according to their function When the switch actuator is pushed to the right seen from the top the switch is closed The schematic for the board indicates the functions of each switch The switch functionality is summarized in Table 1 Two headers are also provided for operating the control lines of the LMH0O346SQ SDI Reclocker The first is located immediately below the DIP switches This header is meant to be used with two pin jumpers and provides parallel functionality to the DIP switches When a jumper is installed on the header it overrides the function of the equivalent
7. Rev 1 0 2008 National Semiconductor Corp To generate the example output eye diagram shown the PC and the spectrum analyzer are not required These items are used for other elements of the test procedure Table 2 Test Equipment and Material Required Description Suggested Equipment Manufacturer Equipment Name Model Number Bit Error Rate Test Set with the following SyntheSys BERTScope 12500B 3 Gb s Serial Data Capability Research J Bert N4903A l ae ss Agilent Jitter Injection Capability Technologies Eye Diagram and Jitter Measurement Capability DC Power Supply Hewlett Packard DC Power Supply E3610A 3 3V 0 5A Spectrum Analyzer with minimum 3 GHz Hewlett Packard Portable Spectrum 8593E bandwidth Analyzer Six 6 each UTIFlex coaxial cables Micro Coax Inc UTIFlex UFB205A 0 0360 SMA connectors 000000 36 inch length Test Equipment Settings The example eye diagram shown is for a 1 4835 Gb s HD SDI signal Similar eye diagrams can be obtained at 2 97 Gb s and at 270 Mb s by changing the bit rate setting on the signal generator Generator Setting Value Comments Data Rate 1 4835 Gb s Any valid SMPTE data rate supported by the LMH0346SQ SDI reclocker can be used These rates are 270 Mb s 1 485 Gb s 1 4835 Gb s 2 967 Gb s and 2 97 Gb s Data Pattern PRBS 7 This is a standard pseudorandom pattern 127 bits long Other pseudorandom patterns can be used as
8. SD346EVK i User Gude N LMH0346SQ SDI Reclocker Evaluation Board User Guide Introduction The LMH0346SQ Serial Digital Interface SDI Reclocker is designed to recover a clean clock from a serial digital video signal which may be contaminated by jitter and to resynchronize the input video data to the recovered clean clock The LMH0346SQ SDI Reclocker accepts signals conforming to standards SMPTE 259M C SMPTE 292M and SMPTE 424M The SD346EVK is a PC board designed to aid in the evaluation of the performance characteristics of the LMH0346SQ Reclocker The SD346EVK PC board is fabricated with FR 4 PC board material The inputs and outputs of the LMHO0346SQ are connected to the SMA coaxial connectors on the board using controlled impedance 500 single ended and 1000 differential PC board traces This instruction guide describes the features of the SD346EVK It should be used in conjunction with the LMH0346SQ SDI Reclocker data sheet Schematics and Bill of Materials BOM for the SD346EVK board are included separately In addition board fabrication files are available on request Contact your local National Semiconductor representative PC Board Features The SD346EVK is shown in Figure 1 The features of the board are described in the sections that follow General Description The SD346EVK is a four layer PC board fabricated using FR 4 The layer stackup is shown in drawing number 551600090 001 As the drawing indicates the nominal board
9. Serial Clock Output SCO_EN SCO_EN Second output Second output Enable of the of the SD346SQEVK SD346SQEVK outputs the outputs a copy recovered clock of the reclocked data Indicator on green Indicator off SD HD Indication None SD_HD Indicator green Indicator red indicates HD or indicates SD 3 Gbps signal signal detected or no signal detected Lock Detection None LOCK DET Indicator green Indicator red when the when the LMH0346SQ LMH0346SQ reclocker is reclocker is not locked to the locked to the incoming signal incoming signal SD346EVK User Manual 4 of 10 Rev 1 0 2008 National Semiconductor Corp There is also a header on the right side of the SD346EVK board which is connected to the SD HD indication of the LMHO0346SQ SDI Reclocker It is meant to control an LMH0302 SDI cable driver The output polarity of the signal on this header is such that it can be connected directly to the SD HD control input of the LMH0302 cable driver The header on the SD346EVK board facilitates this connection 27 MHz Reference The SD346EVK includes an on board 27 MHz reference crystal In the normal configuration of the board this crystal is active The LMH0346SQ SDI Reclocker includes a crystal driver circuit that produces the 27 MHz reference clock using this crystal The SD346EVK also includes a connector for inputting an external 27 MHz reference if desired In order to disable the on board crystal a OQ resistor indicated on the
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11. ih 7 R208 4 wR21 waa K823 S0 HD Eos LED TABLE 807H0 LOCK DET R SO External Control Header MBus Connector not installed 12 x COND SDI Output Connectors 50Q SMA noe nae is enas Ip 27 MHz scn enc2 Reference Crystal R32 R38 SMAS Tio LL IN SMA l S 50 Dr MICROSTRIP LINES XTAL CincurT National Semiconductor LMH0346SQ SDI Reclocker amp O a SD346EVK User Manual Rev 1 0 iv C0 SD02 c C22 Cs m P R33 R39 SD346SQ Figure 1 SD346EVK Photo 2 of 10 2008 National Semiconductor Corp 27 MHz Reference External Input Although the SMA coaxial connectors are ruggedized for attachment to the edge of the SD346EVK PC board they can be damaged by over tightening them A standard SMA torque wrench with a torque limitation of 7 10 in pounds should always be used to connect cables to the connectors on the SD346EVK Do not allow heavy cables to hang unsupported from the connectors as they may break off the board The SDI input and output connectors occur in pairs as the input and the outputs of the LMH0346SQ SDI Reclocker are differential The outputs of the LMH0346SQ SDI Reclocker are internally terminated The input to the LMH0346SQ Reclocker is externally terminated on the SD346EVK board with a 1000 differential resistor The SD346EVK has two sets of outputs connected to the two outputs of the LMH0346SQ SDI Reclocker The first set of outputs labeled SDO alway
12. s carry the digital video data signal unless they are muted If the Reclocker is locked and not bypassed these outputs carry a reclocked version of the input signal If the Reclocker is unlocked or bypassed these outputs carry an unmodified replica of the input signal The outputs may be muted by the output mute control described in a later section The second set of outputs of the SD346EVK labeled SCO SDO2 can be set either to output a copy of the data on the first set of outputs either reclocked or not as described above or to output the recovered clock signal from the LMH0346SQ SDI Reclocker The clock signal is only available when the LMH0346SQ SDI reclocker is locked to a valid input signal The inputs and outputs of the SD346EVK PC board are AC coupled with 4 7 uF 0603 size coupling capacitors These capacitors are rated for 6 3 VDC working voltage The inputs and outputs of the SD346EVK board may be terminated in any DC voltage that does not exceed this 6 3 V limit relative to the negative power supply The coupling capacitors may be replaced with 0603 size 00 resistors for DC coupled evaluation DC Power Connectors DC power is applied to the SD346EVK by means of standard 175 inch diameter binding posts Three power supply terminals are provided The first is a common ground to which the negative supply voltage should be connected This is the black binding post on the board The two red binding posts on the board are meant to provide
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15. thickness is 062 inches The board includes internal ground and power supply planes The ground plane is the second layer of the board underneath the top layer and is the reference for the controlled impedance traces on the top layer The SD346EVK is fabricated using Pb free solder and components and is comprised of ROHS compliant materials SDI Input and Output Connectors The SDI input and output connectors are 500 SMA female coaxial connectors jacks These connectors will mate non destructively with 500 SMA male coaxial connectors plugs They will also mate non destructively with 500 APC 3 5 male coaxial connectors and 2 92 mm K male coaxial connectors These connectors will NOT mate to 2 4 mm connectors Do not attempt to connect 2 4 mm connectors to the SD346EVK PC board This will damage both the board and the connected device or cable SD346EVK User Manual 1 of 10 Rev 1 0 2008 National Semiconductor Corp DC Power Connectors ug ul RiB A B A ET ion TABLE SR Hos 7 285 RATED k RATEO uio Na uf e LL 111 4 Control B G DIP SCO_EN BYPASS Switches R15 Control Header A RZ ED R2E 0 Be H HR HH c one oo RIEA SDI Input Connectors 509 SMA Sp AUTO BP OP MUTE SCO_EN S C3 C19 RECKROCKER EE S R35 R30 ue gt gpp 100 OHM OIF FERENTIAL ant R13 4 C15 i cape H SDI oDi Cl m ae ang Sije oO T at Tan Xi ZE FPGA C Control Indicator LEDs r TE L ft x EAE ae
16. well as live SDI video patterns which are not in general pseudorandom or the SMPTE pathological data sequences SD346EVK User Manual Rev 1 0 7 of 10 2008 National Semiconductor Corp Generator Setting Value Comments Output Amplitude Output Offset 200 mV OV This is the specified lower limit for the input differential voltage for the LMH0346SQ Higher input voltages can be used A differential input voltage of 200 mV peak to peak means that each of the two inputs swings 100 mV peak to peak The inputs of the SD346EVK are AC coupled so the output offset of the generator does not matter unless it overstresses the input coupling capacitors Do not exceed 4 V output offset on the generator to avoid this Injected Jitter 0 Ul If the signal generator is capable of injecting controlled jitter the jitter tolerance of the LMH0346SQ may be evaluated using the SD346EVK board Typical settings used for jitter tolerance testing on the SD346EVK board are 0 7 U jitter amplitude at 5 MHz and 10 MHz jitter frequencies SD346EVK User Manual Rev 1 0 8 of 10 2008 National Semiconductor Corp SD346EVK Board Settings Essentially all of the settings of the SD346EVK are set to their nominal values to produce the typical eye diagram shown in Figure 3 Table 3 Control Settings and Indicator States to Produce Typical Eye Diagram
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