SD356EVK Evaluation Kit Board for LMH0356 SDI Reclocker User
Contents
1. SD356EVK User Manual 9 of 11 Rev 1 0 2008 National Semiconductor Corp SD356EVK Board Settings Essentially all of the settings of the SD356EVK are set to their nominal values to produce the typical eye diagram shown in Figure 3 3 Control Hi and Indicator States to Produce Typical Eye Diagram Indicator State and Comments Indicator Indicator State Input oll anual nll Both switches off This is the setting for Sel1 Sel1 selecting input SDIO 5 e n Other selection settings ee can be used with other SDI inputs Rate Select Rated Rated Both switches off This is the setting for Rate Rate PORY automatic rate detect Both indicator Th t l cton lights green e rate selectio switches can also be set to match the data rate input For a 1 4835 Gb s signal as described here Rate0 can be off and Rate 1 on Bypass Autobypass Bypass Aut Bypass Switch off LMHO0356 reclocker in obypass normal autobypass Indicator light off mode Output Mute Mute off LMH0356 reclocker Suter toa is active Serial Clock Output boil EN hodil EN Switch off This test will produce the Enable indicator liaht off S2Me results regardless J of the state of the SCO_EN Chip Enable ENABLE ENABLE Switch of LMHO0356 is powered up Indicator light on 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 Non2. Two of the inputs to the SD356EVK inputs SDIO and SDI1 are equipped with long FR 4 test traces The trace lengths are 30 inches and 15 inches respectively on the two inputs The other two inputs are coupled to the LMH0356 SDI reclocker through very short FR 4 traces The FR 4 test traces are meant to demonstrate the action of the input passive equalizers The input passive equalizers compensate for the ISI introduced by long PC board traces The SD356EVK demonstrates that the performance of the LMH0356 SDI reclocker is unaffected by up to 30 inches of lossy FR 4 trace on its inputs The SD356EVK also includes a 30 inch FR 4 test trace which can be used to evaluate the ISI effect introduced by such a trace If desired connectors can be soldered on to this test trace and the ISI can be measured by external test equipment If this is desired the same connectors used on the inputs and outputs of the SD356EVK may be used These connectors are specified in the bill of materials for the SD356EVK DC Power Connectors DC power is applied to the SD356EVK 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 3 3 VDC to 1 the LMH0356 SDI reclocker alone and 2 the remainder of the circuitry on the SD356EVK board The dual su
3. SD HD LOCK DET D 5 of 11 Switch On Function and Indication Select line pulled to logic 1 Indicator light turns red Rate line pulled to logic 1 Indicator light turns red LMH0356 reclocker forced to bypass mode Indicator on red LMH0356 reclocker output is muted Second output of the SD356EVK outputs the recovered clock Indicator on green LMH0356 is powered up active Indicator on green Indicator green indicates HD or 3 Gb s signal or no signal detected Indicator on green when the LMH0356 reclocker Is locked to the incoming signal 2008 National Semiconductor Corp Switch Off Function and Indication Select line pulled to logic O Indicator light turns green Rate line pulled to logic 0 Indicator light turns green LMH0356 reclocker in normal autobypass mode Indicator off LMH0356 reclocker output is active Second output of the SD356EVK outputs a copy of the reclocked data Indicator off LMHO0356 is powered down inactive Indicator off Indicator red indicates SD signal detected Indicator off when the LMH0356 reclocker is not locked to the incoming signal There is also a header on the right side of the SD356EVK board which is connected to the SD HD indication of the LMH0356 SDI reclocker It is meant to control an LMHO302 SDI cable driver The output polarity of the signal on this header is such that it
4. Instruments SD356EVK NOPB
5. SD356EVK User Manual 6 of 11 Rev 1 0 2008 National Semiconductor Corp CK CK BERTScope Clock In Clock Out Data Out Data In Data Data Data Data UTIFlex Cable UTIFlex Cable UTIFlex Cable TIFI SD356 EVK Board ai a SDIO SDO SDIO SDO SCO SCO VCC_IC VCC GND SMBus SMBus Controller Cable HP E3610A DC Power Supply HP8593E Spectrum Analyzer S PC with SMBus Controller and Serial Port Figure 2 Test setup for the SD356EVK board SD356EVK User Manual 7 of 11 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 Equipment Name Model Number Bit Error Rate Test Set with the following SyntheSys BERTScope 12500B 3 Gb s Serial Data Capability esearch J Bert N4903A Agilent Technologies Jitter Injection Capability 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 SD356EVK User Manual 8of11 Rev 1 0 2008 Nation
6. can be connected directly to the SD HD control input of the LMH0302 cable driver The header on the SD356EVK board facilitates this connection 2 MHz Reference The SD356EVK includes an on board 27 MHz reference crystal In the normal configuration of the board this crystal is active The LMH0356 SDI reclocker includes a crystal driver circuit that produces the 27 MHz reference clock using this crystal The SD356EVK 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 schematic for the board must be removed This permits evaluation of the operation of the LMH0356 SDI reclocker with an external reference SMBus Connector The LMH0356 SDI reclocker can be controlled via a 2 wire bus very similar to the standard SMBus This mode of operation is reserved for factory use only Typical Output Waveform A test waveform can be readily generated and used to verify proper operation of the SD356EVK In order to generate this output waveform the following setup procedure should be used Test Setup The test setup used for testing the SD356EVK 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 thse measurements The equipment used for testing the SD356EVK is listed in Table 2
7. SD356EVK Evaluation Kit Sane N Board for LMH0356 SDI Reclocker User Manual Introduction The LMH0356 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 LMH0356 SDI reclocker accepts signals conforming to standards SMPTE 259M C SMPTE 292M and SMPTE 424M The LMH0356 includes in addition to the reclocking circuitry an input 4 channel multiplexer which permits selection for reclocking of any of four serial digital video signals at the inputs of the LMHO0356 It also includes fixed equalizers on its inputs designed to reduce the inter symbol interference ISI generated by dispersive PC board traces between the serial digital video source and the reclocker inputs The LMH0356 fixed equalizers are designed to compensate for the frequency dependent loss of up to 30 inches of FR 4 PC board trace The SD356EVK is a PC board designed to aid in the evaluation of the performance characteristics of the LMHO0356 reclocker The SD356EVK PC board is fabricated with FR 4 PC board material The inputs and outputs of the LMH0356 are connected to the SMA coaxial connectors on the board using controlled impedance 500 single ended and 1000 differential PC board traces This instruction manual describes the features of the SD356EVK It should be used in conjunction with the LMH0356 SDI rec
8. al Semiconductor Corp 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 Data Rate 1 4835 Gb s Any valid SMPTE data rate supported by the LMH0356 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 well as live SDI video patterns which are not in general pseudorandom or the SMPTE pathological data sequences Output Amplitude 200 mV This is the specified lower limit for the input differential voltage for the LMH0356 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 Output Offset OV The inputs of the SD356EVK 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 O Ul If the signal generator is capable of injecting controlled jitter the jitter tolerance of the LMHO0356 may be evaluated using the SD356EVK board Typical settings used for jitter tolerance testing on the SD36EVK board are 0 7 UI jitter amplitude at 5 MHz and 10 MHz jitter frequencies
9. as the inputs and outputs of the LMH0356 SDI reclocker are differential It is not necessary to terminate unused inputs Both the inputs and outputs of the LMH0356 SDI reclocker are internally terminated The SD356EVK has two sets of outputs connected to the two outputs of the LMH0356 SDI reclocker The first set of outputs labeled SDO always 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 SD356EVK 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 describe above or to output the recovered clock signal from the LMH0356 SDI reclocker The clock signal is only available when the LMH0356 SDI reclocker is locked to a valid input signal The inputs and outputs of the SD356EVK PC board are AC coupled with 1 uF 0402 size coupling capacitors These capacitors are rated for 10 VDC working voltage The inputs and outputs of the SD356EVK board may be terminated in any DC voltage that does not exceed this 10 V limit relative to the negative power supply The coupling capacitors may be replaced with 0402 size 0Q resistors for DC coupled evaluation FR 4 Traces
10. e 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 SD356EVK User Manual 10 of 11 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 SD356EVK EYE DIAGRAM Print Fit a w A Rise Time 00 1 ps Fall Time 00 1 ps Gata Unit Intr 64 1 ps Amplitude 757 4 mv Jitter FF 11 5 ps 11 5 Min 11 5 Max 11 5 Mean 0 0 Sigma a a SS PN Running Fans 00 00 22 E Center 134 ps Ne 1330 bete Z eee Div Ger PRES 7 1 463 50 Mbit s bet Det a 1 483 50 Mbit s BER Disabled 1 Local Figure 3 Typical output eye diagram for 1 4835 Gb s Summary The SD356EVK is a simplified four layer PC board designed to facilitate the evaluation of the LMH0356 SDI reclocker In concept it is a simple input output board with the LMH0356 SDI reclocker in the signal path This manual has described the features of the PC board and its operation Please also see the SDI Feature site at www national com sdi SD356EVK User Manual 11 of 11 Rev 1 0 2008 National Semiconductor Corp Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery amp Lifecycle Information Texas
11. locker data sheet Schematics and PC board layout drawings for the SD356EVK board are included separately In addition board fabrication files are available on request Contact your local National Semiconductor representative PC Board Features The SD356EVK is shown in Figure 1 The features of the board are described in the sections that follow General Description The SD356EVK is a four layer PC board fabricated using FR 4 The layer stackup is shown in drawing number 980600057 001 As the drawing indicates the nominal board 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 SD356EVK 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 50Q SMA female coaxial connectors jacks These connectors will mate non destructively with 50O SMA male coaxial connectors plugs They will also mate non destructively with 50Q 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 SD356EVK PC board This will damage both the board and the connected device or cable SD356EVK User Manual 1 of 11 Rev 1 0 2008 National Semiconduct
12. or Corp 30 inch SDI Input FR4 Trace Connectors Input 500 SMA SDIO Og o1os 15 inch FR4 Trace Input SDI1 if OE Te LLINSe di61S0e0 IW T HON St ros Control DIP Switches DSTI Control Headers LMH0356 SDI Reclocker 30 inch FR4 Trace Coupon KE R Although the SMA coaxial connectors are ruggedized for attachment to the edge of the SD356EVK PC board they can be damaged by over tightening them A standard SMA torque wrench with a torque Control Indicator LEDs Ca ra HATE i 7 NABLE E THA w RAJ cif Fil i E0203 Ao Seon i crn ek ee TEE E sCU EN PAYEN F O e a fe i n 043 LA a fe E a FARRAR R SS 1 ti 4 mm ULRER a l TA i wat he CT TH i A alt 50 OHM AICROSTAIS LINES XTA CIRCULTRAY 30 INCH MICROSTRIP 100 OHI DIFFERENTIAL TEST TRACES T_IN National to 5 c7 a eea SD356 Figure 1 SD356EVK board DC Power Connectors External Control Header SMBus Connector not active SDI Output Connectors 50O SMA 27 MHz Reference Crystal 27 MHz Reference External Input limitation of 7 10 in pounds should always be used to connect cables to the connectors on the SD356EVK Do not allow heavy cables to hang unsupported from the connectors as they may break off the board SD356EVK User Manual 2 of 11 Rev 1 0 2008 National Semiconductor Corp The SDI input and output connectors occur in pairs
13. pply configuration permits measurement of the current drawn by the LMH0356 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 SD356EVK board so the effects of power supply variations can be evaluated It is recommended that the maximum supply voltage rating of the LMH0356 4 VDC not be exceeded The LMH0356 SDI reclocker can be powered down using its enable feature This feature is accessible through the control inputs described in the next section The dual supply configuration of the SD356EVK can be used to observe the effect on supply current of powering down the LMH0356 Controls and Indicators The control lines of the LMH0356 SDI reclocker can be controlled by various means using the SD356EVK The primary method for controlling these lines is the DIP switches located on the SD356EVK board The DIP switches are labeled according to their function When the switch actuator is pushed to the right SD356EVK User Manual 3 of 11 Rev 1 0 2008 National Semiconductor Corp 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 below Two headers are also provided for operating the control lines of the LMH0356 SDI reclocker The firs
14. t 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 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 LMH0356 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 SD356EVK PC board It is recommended that this header only be used for advanced control applications and only by users familiar with the operation of the LMHO0356 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 LMH0356 SDI reclocker The LED states and their meanings are summarized in Table 1 SD356EVK User Manual 4 of 11 Rev 1 0 2008 National Semiconductor Corp Input Select Rate Select Bypass Autobypass Output Mute Serial Clock Output Enable Chip Enable SD HD Indication Lock Detection SD356EVK User Manual Rev 1 0 Table 1 Control and Indicator Function Summary Sel0 Sel1 Rate0 Rate1 Bypass Autobypass OP Mute SCO EN ENABLE None Sel0 Rated Rate Bypass None SCO_EN ENABLE
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