National Semiconductor LMH1983 User Manual Download Page 21 | Manualshive

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Summary of Contents for LMH1983

Page 1: ...LMH1983 Evaluation Kit Users Guide Page 1 of 25 LMH1983 Evaluation Kit Users Guide Version 1 0 2 4 10 ...

Page 2: ...and device register descriptions and programming please refer to the GUI software manual and LMH1983 datasheet Overview of LMH1983 The LMH1983 clock generator generates four video specific clocks The device has four PLLs in it PLL1 uses an external 27 MHz VCXO and always generates a 27MHz reference clock This clock may be locked to an input reference which can be any of a number of different types...

Page 3: ...pply power is to apply 5V across the top two pins on J8 With a jumper on JP17 and on board LDO is used to generate the 3 3V rail that powers the circuits on the evaluation board Alternately JP17 may be removed and a 3 3V rail may be applied directly to the bottom two pins of J8 LMH 1981 J2 LMH1983 Quad 2 1 MUX VCXO X2 J8 J1 J3 J7 J4 J6 J5 LP 3878 Power Header Analog Ref In BNC Status LEDs VCXO X1 ...

Page 4: ...h has the control software on it Running the program on the CD will install the software on your computer Apply power to the Evaluation Board and then attach a USB cable between the computer and the board Windows will recognize the board and pop up the When this window comes up select No not this time and Next ...

Page 5: ...LMH1983 Evaluation Kit Users Guide Page 5 of 25 Select Install from a list or specific location ...

Page 6: ...LMH1983 Evaluation Kit Users Guide Page 6 of 25 ...

Page 7: ... Anyway The driver for the LMH1983 evaluation board will now be installed and you can start the ALP software When you start the Analog LaunchPAD software it should recognize the evaluation board and the screen will look like the figure below If the board is not connected properly or not powered up the ALP software will start up in a demo mode which will look like the normal mode but will not contr...

Page 8: ...e box this will update all of the status controls whenever something is written In some cases writing to one register will result in multiple things changing and checking this button will make sure that everything is kept updated There are several panels in the GUI the first is the main control panel and allows for basic control over the board Also very useful is the Registers tab which will allow...

Page 9: ...be attached directly to the pins If it is desired that the differential outputs drive a load the load resistor should be moved to be adjacent to the final load In addition to the differential outputs there are 50Ohm single ended outputs as well These are provided by using LMH0302 SDI cable drivers On the initial version of the evaluation board these outputs exhibit some undershoot and ringing at 4...

Page 10: ...ounting 27MHz clock pulses over several Hsync periods There are some standards where Hsync may be the same in which case V and F are examined to determine if the reference is an interlaced or progressive format before format detection is complete Configuring the board for operation in free run mode using the on board reference oscillator To operate the board in stand alone mode remove the jumper f...

Page 11: ...LMH1983 Evaluation Kit Users Guide Page 11 of 25 ...

Page 12: ...p bandwidth of about 3 Hz min and damping factor of 0 70 min These were calculated using the approximations below which assume nominal ICP1 250uA and DIV_N1 1716 for the NTSC input format Loop Bandwidth BW R47 ICP1 KVCO DIV_N1 Damping Factor DF 0 5 R47 sqrt C33 C39 ICP1 KVCO DIV_N1 Loop Filter The loop filter components include R47 C39 C40 and C33 It s recommended to avoid use of ceramic capacitor...

Page 13: ... source of leakage current for loop filter circuit The op amp offers very high input impedance to minimize this leakage current and high slew rate to ensure proper loop operation The VCXO input control voltage input can be measured at TP29 VC_BUF Note that when the LMH1983 is operating in free run mode the VC_LPF output set by the user defined free run voltage control register may be limited by th...

Page 14: ...00R differential load Using a true differential input signal can provide more common mode rejection and reduce noise crosstalk and thus reduce sources of deterministic jitter INDEPENDENT AUDIO CLOCK GENERATION By default the audio clock generated from PLL4 is phase locked to the 27 MHz VCXO clock reference from PLL1 and in turn is synchronized to the reference input It is possible to have the audi...

Page 15: ...LMH1983 Evaluation Kit Users Guide Page 15 of 25 Appendix A Schematics ...

Page 16: ...COC30 PIC3101 PIC3102 COC31 PIC3201 PIC3202 COC32 PIC3301 PIC3302 COC33 PIC3401 PIC3402 COC34 PIC3501 PIC3502 COC35 PIC3601 PIC3602 COC36 PIC3701 PIC3702 COC37 PIC3801 PIC3802 COC38 PIC3901 PIC3902 COC39 PIC4001 PIC4002 COC40 PIC4101 PIC4102 COC41 PIC4201 PIC4202 COC42 PIC4301 PIC4302 COC43 PIC4401 PIC4402 COC44 PIC4501 PIC4502 COC45 PIC4601 PIC4602 COC46 PIC4701 PIC4702 COC47 PIC4801 PIC4802 COC4...

Page 17: ...58 PIC5901 PIC5902 COC59 PIC6001 PIC6002 COC60 PIC6101 PIC6102 COC61 PIC6201 PIC6202 COC62 PIC6301 PIC6302 COC63 PIC6401 PIC6402 COC64 PIC6501 PIC6502 COC65 PIC6601 PIC6602 COC66 PIC6701 PIC6702 COC67 PIC11601 PIC11602 COC116 PIC11701 PIC11702 COC117 PIC11801 PIC11802 COC118 PIC11901 PIC11902 COC119 PID101 PID102 COD1 PID201 PID202 COD2 PID301 PID302 COD3 PIJ401 PIJ402 PIJ403 PIJ404 PIJ405 COJ4 PI...

Page 18: ...01 PIC302 COC3 PIC401 PIC402 COC4 PIC501 PIC502 COC5 PIC601 PIC602 COC6 PIC701 PIC702 COC7 PIC801 PIC802 COC8 PIC901 PIC902 COC9 PIC1001 PIC1002 COC10 PIC1101 PIC1102 COC11 PIC1201 PIC1202 COC12 PIC1301 PIC1302 COC13 PIC1401 PIC1402 COC14 PIC1501 PIC1502 COC15 PIC1601 PIC1602 COC16 PIC1701 PIC1702 COC17 PIC1801 PIC1802 COC18 PIC1901 PIC1902 COC19 PIJ101 PIJ102 PIJ103 COJ1 PIJ201 PIJ202 PIJ203 PIJ2...

Page 19: ...OC80 PIC8101 PIC8102 COC81 PIC8201 PIC8202 COC82 PIC8301 PIC8302 COC83 PIC8401 PIC8402 COC84 PIC8501 PIC8502 COC85 PIC8601 PIC8602 COC86 PIC8701 PIC8702 COC87 PIC8801 PIC8802 COC88 PIC8901 PIC8902 COC89 PIC9001 PIC9002 COC90 PIC9101 PIC9102 COC91 PIC9201 PIC9202 COC92 PIC9301 PIC9302 COC93 PIC9401 PIC9402 COC94 PIC9501 PIC9502 COC95 PIC9601 PIC9602 COC96 PIC9701 PIC9702 COC97 PIC9801 PIC9802 COC98...

Page 20: ...1014 PIP1015 PIP1016 COP1 PIP201 PIP202 PIP203 PIP204 PIP205 PIP206 COP2 PIR8601 PIR8602 COR86 PIR8701 PIR8702 COR87 PISW201 PISW202 PISW203 PISW204 COSW2 PISW301 PISW302 PISW303 PISW304 COSW3 PIU1001 PIU1002 PIU1003 PIU1004 PIU1005 PIU1006 PIU1007 PIU1008 PIU1009 PIU10010 PIU10011 PIU10012 PIU10013 PIU10014 PIU10015 PIU10016 PIU10017 PIU10018 PIU10019 PIU10020 PIU10021 PIU10022 PIU10023 PIU10024 ...

Page 21: ...6 PAU3037 PAU3038 PAU3039 PAU3040 COU3 PAU401 PAU402 PAU403 PAU404 PAU405 PAU406 COU4 PAU501 PAU502 PAU503 PAU504 PAU505PAU506PAU507 PAU508 PAU509 PAU5010 PAU5011 PAU5012 PAU5013 PAU5014 PAU5015 PAU5016 PAU5017 COU5 PAU6017 PAU6016PAU6015PAU6014 PAU6013 PAU6012 PAU6011 PAU6010 PAU609 PAU608 PAU607 PAU606 PAU605 PAU604 PAU603 PAU602 PAU601 COU6 PAU701 PAU702 PAU703 PAU704 PAU705PAU706PAU707 PAU708 ...

Page 22: ......

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Page 24: ... PAU201 COU2 PAU10064 PAU10063 PAU10062 PAU10061 PAU10060 PAU10059 PAU10058 PAU10057 PAU10056 PAU10055 PAU10054 PAU10053 PAU10052 PAU10051 PAU10050 PAU10049 PAU10048 PAU10047 PAU10046 PAU10045 PAU10044 PAU10043 PAU10042 PAU10041 PAU10040 PAU10039 PAU10038 PAU10037 PAU10036 PAU10035 PAU10034 PAU10033 PAU10032PAU10031PAU10030PAU10029PAU10028PAU10027PAU10026PAU10025PAU10024PAU10023 PAU10022PAU10021 P...

Page 25: ...06 COU4 PAU501 PAU502 PAU503 PAU504 PAU505PAU506PAU507 PAU508 PAU509 PAU5010 PAU5011 PAU5012 PAU5013 PAU5014 PAU5015 PAU5016 PAU5017 COU5 PAU6017 PAU6016PAU6015PAU6014 PAU6013 PAU6012 PAU6011 PAU6010 PAU609 PAU608 PAU607 PAU606 PAU605 PAU604 PAU603 PAU602 PAU601 COU6 PAU701 PAU702 PAU703 PAU704 PAU705PAU706PAU707 PAU708 PAU709 PAU7010 PAU7011 PAU7012 PAU7013 PAU7014 PAU7015 PAU7016 PAU7017 COU7 PA...

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