DEMO MANUAL DC2248A LTC6951 Ultralow Jitter Multi-Output Clock Synthesizer with Integrated VCO Description Demonstration circuit 2248A features the LTC®6951, an Ultralow Jitter Multi-Output Clock Synthesizer with Integrated VCO. For ease of use, the DC2248A is powered from a single 6V supply and comes installed with a 100MHz reference. Direct access to the LTC6951 5V, 3.3V and the reference supplies is possible by removing jumpers. For evaluation of the LTC6951 with other references, the DC2248A can be modified to accommodate different onboard or external components. All differential inputs and outputs have 0.5" spaced SMA connectors. The DC2248A has four AC coupled CML outputs with 50Ω transmission lines making them suitable to drive 50Ω impedance instruments. The LVDS output is DC coupled. The LTC6951’s synchronization functions are made available via the LTC6951 SPI interface, an SMA connector and a turret. The DC2248A can be modified to use an onboard switch and debounce circuit to control the sync pin. A DC2026 (or DC590B) USB serial controller board is used for SPI communication with the LTC6951, controlled by the supplied LTC6951Wizard™ software. Design files for this circuit board are available at http://www.linear.com/demo/DC2248A L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LT6951Wizard, EZSync ParallelSync and QuikEval are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. OUT4, LVDS DC-COUPLED OUTPUTS, SMA OUT3, CML AC-COUPLED OUTPUTS, SMA RIBBON CABLE CONNECTION TO DC590 OUT0, CML AC-COUPLED OUTPUTS, SMA SUPPLY OPTION, JUMPERS, REFER TO DC2248 RECONFIGURATION OUT1, CML AC-COUPLED OUTPUTS, SMA SINGLE SUPPLY 6V – 9V INPUT, BANANA JACKS, DEFAULT OPTION OUT2, CML AC-COUPLED OUTPUTS, SMA FREQUENCY REFERENCE OPTION, SMA AND TURRET, REFER TO DC2248 RECONFIGURATION SYNC INPUT, SMA AND TURRET, DEFAULT OPTION SYNC OPTION, ONBOARD SWITCH AND DEBOUNCE CIRCUIT REFER TO DC2248 RECONFIGURATION Figure 1. DC2248A Connections dc2248af 1 DEMO MANUAL DC2248A Quick Start Procedure The DC2248A is easy to set up to evaluate the performance of the LTC6951. Follow the procedure below. LTC6951Wizard Installation DC2026 and DC590B Configuration The LTC6951Wizard software is used to communicate with the LTC6951. It uses the DC2026 (or DC590B) to translate between USB and SPI-compatible serial communications formats. It also includes advanced PLL design and simulation capabilities. The following are the LTC6951Wizard system requirements: DC2026: Refer to Figure 2. Set the JP3 jumper to the 3.3V (preferred) or 5V position. • Windows Operating System: Windows XP, Windows 2003 Server, Windows Vista, Windows 7 DC590B: Refer to Figure 2. Set the JP6 jumper to the 3.3V (preferred) or 5V position. JP4 should select “EN”, JP5 “ISO” and “SW” should both select “ON.” • Microsoft .NET 3.5 SP1 or later The LTC6951Wizard and the DC2026 (or DC590B) are required to control the DC2248A through a personal computer (PC). Connect either the DC2026 (or DC590B) to one of your computer’s USB ports with the included USB cable. The DC2026 has the ability to run Linduino code. Refer to http://www.linear.com/solutions/linduino and the Frequently Asked Question section (Question #3) for more details. • Windows Installer 3.1 or later • Linear Technology’s® DC590B or DC2026 (with the DC590B emulator sketch loaded) The DC2026 arrives from the factory with the DC590B emulator sketch loaded. If this is not the case refer to the Troubleshooting section. J1 (DC2026), J4 (DC590B) RIBBON CABLE CONNECTION TO PC J5, USB CONNECTION TO PC J3, USB CONNECTION TO PC JP3 (DC2026), JP6 (DC590B) SELECT 3.3V OPTION JP5 JUMPER JP4 JUMPER Figure 2. DC2026B and DC590B Jumper and Connector Location 2 dc2248af DEMO MANUAL DC2248A Quick Start Procedure Download the LTC6951Wizard setup file at www.linear. com/LTC6951Wizard. 2. Connect the DC2026 (or DC590B) to the DC2248A with the provided ribbon cable. Run the LTC6951Wizard setup file and follow the instructions given on the screen. The setup file will verify and/or install Microsoft .NET and install the LTC6951Wizard. Refer to the LTC6951Wizard Help menu for software operation. 3.Run the LTC6951Wizard application. DC2248A Configuration 4.In LTC6951Wizard, click File → Load Settings and select file “ALL_CHAN_600MHz.6951set”. The DC2248A’s red STATUS LED (D1) should illuminate after step 4. A 600MHz signal should be present on all outputs. 1.Connect J15 and J16 to a power supply and apply power (see Figure 1 and the Typical DC2248A Requirements and Characteristics table). The three green power supply LEDs (D2, D3, D4) should illuminate at this point. Be sure to power down or terminate any unused RF output with 50Ω, or poor spurious performance may result. 5.Synchronize outputs by toggling the LTC6951 SSYNC bit from the LTC6951Wizard. Figure 3. LTC6951Wizard Screenshot dc2248af 3 DEMO MANUAL DC2248A Troubleshooting If the green LEDs (D2, D3, or D4) do not illuminate: 1. Verify J15 measures between 6V and 9V (see the Typical DC2248A Requirements and Characteristics table). 2. Verify JP1, JP2, JP3 jumpers are installed correctly (refer to the DC2248A schematic sheet 3). 3. Verify the voltages at JP1, JP2, and JP3 are correct: a. JP1 = 3.3V b.JP2 = 5V c. JP3 = 3.3V If the red LED (D1) does not illuminate: 1. In LTC6951Wizard’s System tab click “Read All’. LTC6951Wizard should match Figure 3. If not, see “Verify DC2248A and LTC6951Wizard Communication.” 2. In LTC6951Wizard’s System tab, Under Status deselect LOCK and select REFOK. If D1 was does not illuminate then verify “V+XO” test point reads 3.3V. 5. If using the DC2026, Verify the DC2026 has the DC590B Emulator sketch loaded by contacting the factory or following these steps. a. Download QuikEval™ at http://www.linear.com/designtools/software/#Data b.Run QuikEval (Linduino connected to the PC) If QuikEval does not find a DC590B, reload the DC590 Linduino sketch. To use the LTSketchbook refer to the Linduino Quick Start tab at http://www.linear.com/solutions/ linduino for instructions on how to start using Linduino. If DC2248A performance is less than the LTC6951 data sheet specifications or LTC6951Wizard Simulation: 1. For unexpected spurious response, verify power supplies are low noise and spurious free power supplies. Power supplies that are based off a switching regulator architecture are known to generate spurs on PLL/VCO outputs. 1. Ensure the DC2026 (or DC590B) is connected to PC. 2. For poor phase noise results, verify the phase noise specifications of the phase noise measurement instrument. Traditional spectrum analyzers have higher phase noise than the LTC6951 and will degrade measurement results. To measure phase noise performance it is recommended to use a signal source analyzer, such as Keysight’s (previously Agilent/HP) E5052. 2. Disconnect and Reconnect DC2026 (or DC590B) to PC. Contact the factory for further troubleshooting. Verify DC2248A and LTC6951Wizard Communication: To verify communication with the DC2248A, the bottom status line in LTC6951Wizard should read “LTC6951” and “Comm Enabled” as shown in Figure 3. If not, then perform the following steps: 3. Ensure DC2026 (or DC590B) is connected to DC2248A. 4. Close LTC6951Wizard and restart. 4 dc2248af DEMO MANUAL DC2248A dc2248A Reconfiguration The following covers the hardware reconfiguration of the DC2248A. Refer to LTC6951Wizard and the LTC6951 data sheet to better understand how to change programmed parameters on the DC2248A. Power Supply Options Table 1 provides the power supply options for DC2248A. Any combination of onboard LDO or external supplies is possible. By default the DC2248A is set up to use the three onboard LDO’s. Table 1. Power Supply Options VOLTAGE, COMPONENTS JUMPER 3.3V*, U2 100MHz reference JP1 5V, U1 LTC6951 JP2 3.3V, U1 LTC6951, U3, U4, U5 and U9 JP3 ONBOARD LDO EXTERNAL SUPPLY Short Jumper Pins 1–2. Apply 6V–9V to J15/J16. (Default Option). Short Jumper Pins 2–3. Apply appropriate voltage to Jumper Pin 1. Reference Options Table 2 details the available reference options and board modifications for each available option. The 6951set files provided assume the frequency and noise profile of the default reference. If a different reference is used, update the reference frequency and noise profile in LTC6951Wizard before simulating the LTC6951 under the Loop Design tab (see Frequently Asked Questions section, question #3 and the LTC6951Wizard Help menu). Sync Options The LTC6951 data sheet describes several synchronization modes. After selecting the desired synchronization mode, refer to Tables 3 and 4 to select a synchronization programming option and the resulting DC2248A board modifications. Refer to the LTC6951 data sheet for SYNC timing and level requirements. CML Outputs (OUT0, OUT1, OUT2, OUT3) * When using an external reference, power down the onboard reference by shorting JP1 pins 2–3, or poor spurious performance may result. LTC6951 6951SET Files The LTC6951Wizard provides a 6951set file for all LTC6951 data sheet application examples and typical application circuits. After loading a 6951 set file a pop-up window will detail any user actions and board modifications required for the selected file. These same user actions and board modifications are listed in Table 5. The DC2248A has four AC coupled CML outputs. To drive 50Ω impedance instruments connect OUTx+ to the instrument and OUTx– to a 50Ω termination, or vice versa. Refer to LTC6951 data sheet for differential termination options. The V+BIAS turret provides an option to set the DC offset level after the AC coupling capacitor. Modifications are required to use the V+BIAS turret; refer to the DC2248A schematic. LVDS Output (OUT4) Loop Filter Design and Installation Use 6951Wizard to select, design and simulate different loop filters (see Frequently Asked Questions section, question #3). Loop filter components RZ, CI1, CI2, CP, L1 and R1 are located on the top side of the board. Loop filter component C2 is located on the bottom side of the board. The LVDS output is DC coupled without onboard termination by default. The DC2248A provides series and a differential termination resistor options to accommodate other termination networks described in the data sheet. Table 2. Reference Options and Board Modifications DEFAULT REFERENCE OPTION OPTION l INSTALL DEPOPULATE LTC6951 PERFORMANCE COMMENTS Onboard NA NA Limited by onboard reference at frequency offsets <10kHz U2 reference footprint supports 5mm x 7.5mm and 14mm x 9mm packages with 4 or 6 pins External* C36 0402 1µF C35 Best performance when using an ultralow noise external reference For improved performance connect J12 to an ultralow noise reference, such as the Wenzel 501-04517D. * When using an external reference, power down the onboard reference by shorting JP1 pins 2-3, or poor spurious performance may result. dc2248af 5 DEMO MANUAL DC2248A dc2248A Reconfiguration Table 3. LTC6951 Sync Mode Programming Options SYNC PROGRAMMING OPTIONS (See Table 4 for Board Modifications) LTC6951 RAO BIT LTC6951 SSYNC BIT ONBOARD SYNC SWITCH (SW1)* SYNC SMA SYNC SMA AND REF+ SMA EZSync, STANDALONE 0 l l l l EZSync, CONTROLLER 0 l l l EZ204Sync 1 l l l l EZParallelSync 1 l l l l ParallelSync 1 LTC6951 SYNC MODE COMMENTS Modify follower-driver outputs to be DC-coupled, refer to LTC6951 and follower part number data sheets for correct termination networks. l * SW1 output is connected to a debounce circuit to ensure the SYNC pin receives a clean sync signal Table 4. DC2248A Board Modifications for LTC6951 Sync Programming Options DEFAULT SYNC PROGRAMMING OPTION OPTION l R13 LTC6951 SSYNC bit R54 U2, REFERENCE COMMENTS 1kΩ Do Not Install Onboard or External, See Table 2 Refer to LTC6951 data sheet for EZSync timing Onboard or External, see Table 2 requirements. Onboard Sync Switch (SW1) Depopulate 0Ω SYNC SMA Depopulate Do Not Install Onboard or External, see Table 2 SYNC SMA and REF+ SMA Depopulate Do Not Install External Only, see Table 2 When using ParallelSync™ refer to LTC6951 data sheet for REF+ and SYNC pins timing requirements. Table 5. LTC6951Wizard Settings File LTC6951Wizard FILE NAME USER ACTIONS BOARD MODIFICATIONS ALL_CHAN_600MHz Toggle LTC6951 SSYNC register bit NA 6951_EZSYNC_STANDALONE 6951-1_EZSYNC_STANDALONE Toggle LTC6951 SSYNC register bit NA 6951_EZSYNC_MULTI-CHIP 6951-1_EZSYNC_MULTI-CHIP Toggle LTC6951 & LTC6954 SYNC Pin (EZSync timing) Refer to Tables 3 (EZSync CONTROLLER) and 4 6951_ParallelSync_MULTI-CHIP 6951-1_ParallelSync_MULTI-CHIP Toggle LTC6951 CAL register bit Toggle LTC6951 SYNC pin (SYNC to REF timing) Refer to Table 2 (External Reference) Refer to Tables 3 (ParallelSync) and 4 Loop Filter (values provided in LTC6951Wizard File) 6951_JESD204B 6951-1_JESD204B Toggle LTC6951 SSYNC register bit Refer to Table 2 (External Reference) Loop Filter (values provided in LTC6951Wizard File) 6951_FrontPage_LTC2107 NA NA 6951_ParallelSyncw6954 Toggle LTC6951 CAL register bit Toggle LTC6951 SYNC pin (SYNC to REF timing) Refer to Tables 3 (ParallelSync) and 4 6951_JESD204B_LTC2123 Toggle LTC6951 SSYNC register bit NA 6 dc2248af DEMO MANUAL DC2248A Assembly Options Table 6. DC2248A Options and Frequency Ranges ASSEMBLY VERSION PART NUMBER FREQUENCY RANGE DC2248A-A LTC6951IUHF 1.95MHz to 2500MHz DC2248A-B LTC6951IUHF-1 2.1MHz to 2700MHz Frequently Asked Questions 1 How do I use LTC6951Wizard to design a different setup and loop filter, simulate results and program the LTC6951? In the LTC6951Wizard, select Help: Menu →Help. The help file discusses the function of all LTC6951Wizard menus and tabs. The help file also provides a step by step example describing how to design a different frequency plan, design and simulate a loop filter, and how to program the LTC6951 with these new settings. 2.Can the LTC6951Wizard control an LTC6951 on a board other than the DC2248A? Yes, connect the DC2026 (or DC590) SPI lines to the SPI interface of the LTC6951. Also, the LTC6951Wizard allows communication to the DC2248A by sensing resistors R34 and R35 in the DC2248A schematic. If these resistors are not present, the LTC6951Wizard will not communicate with the LTC6951. To allow LTC6951Wizard communication to other hardware, install equivalent resistors in the appropriate location on the backside of DC2026 J1 connector (or DC590B J4 connector). 3.Does the LTC6951 have Linduino Code available? Yes, download the LTC6951 sketch in the LTSketchbook. To use the LTSketchbook and for instructions on how to start using Linduino, refer to the Linduino QuickStart tab at http://www.linear.com/solutions/linduino. This will give programmers a head start in writing code for the LTC6951. It is recommended to use LTC6951Wizard to create the best possible register settings for all conditions. These LTC6951 register settings from LTC6951Wizard can be programmed in a lookup table. At this point the lookup table and LTC6951 sketch can aid in program development. dc2248af 7 DEMO MANUAL DC2248A Typical DC2248A Requirements and Characteristics PARAMETER 6V to 9V Power Supply INPUT OR OUTPUT PHYSICAL LOCATION DETAILS Input J15 and J16 BNC banana jacks Default option, single supply: 6V–9V low-noise and spur-free supply, 500mA*; Green LEDs D2, D3, and D4 illuminate when power supplied. OUT4+, OUT4– Two Outputs J1 and J2 SMA connectors** LVDS, DC coupled, 600MHz, 750mVpk differential, 1.23V DC offset (if powered up)*. Requires 100Ω differential termination. OUT3+, OUT3– Two Outputs J3 and J4 SMA connectors** CML, AC coupled, 600MHz, 800mVpk differential.* OUT0+, OUT0– Two Outputs J5 and J6 SMA connectors** CML, AC coupled, 600MHz, 800mVpk differential.* OUT1+, OUT1– Two Outputs J7 and J8 SMA connectors** CML, AC coupled, 600MHz, 800mVpk differential.* OUT2+, OUT2– Two Outputs J9 and J10 SMA connectors** CML, AC coupled, 600MHz, 800mVpk differential.* SYNC Input J13 SMA connector or SYNC turret Default option, 1kΩ pull-down resistor. See Tables 3 and 4, to ensure correct option is selected. STAT Output STATUS turret Loop Bandwidth – Red LED D1 illuminates when STAT pin in high state. Set by loop filter component values 344kHz* 3.3V Onboard Reference Supply Input JP1, Pin 1 Board modifications required for use, see Table 1. 5V LTC6951 Supply Input JP2, Pin 1 Board modifications required for use, see Table 1. 3.3V LTC6951 Supply Input JP3, Pin 1 Board modifications required for use, see Table 1. REF+ Input J12 SMA connector or REF+ turret Board Modifications required for use, see Table 2. By default an onboard reference (U2) is connected. REF– Input J11 SMA connector or REF– turret By default NOT INSTALLED. TUNE Output/Input Test point Debug Only: connected to LTC6951 TUNE pin. V+BIAS turret Board modifications required for use, refer to the schematic. V+BIAS Input *These values are for the “ALL_CHAN_600MHz.6951set” file and the default onboard reference. **Any unused RF output must be powered down or terminated with 50Ω, or poor spurious performance may result. 8 dc2248af DEMO MANUAL DC2248A PCB Layout Top Layer Parts List ITEM QTY REFERENCE Required Circuit Components 1 1 CI1 2 0 CI2 3 1 CP 4 7 C1, C9, C13, C19, C45, C50, C51 5 1 C2 6 7 1 19 8 9 10 2 12 0 11 12 13 7 6 3 C3 C4, C6, C10, C11, C14-C17, C38-C42, C44, C53, C58, C62, C71, C72 C5, C46 C7, C8, C12, C18, C21, C30-C35, C37 C20, C23, C36, C54, C55, C59, C60, C63-C68 C22, C43, C49, C52, C57, C61, C70 C24-C29 C47, C48, C69 PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., X7R, 68nF, 50V, 10%, 0603 CAP., 0805 CAP., X7R, 1200pF, 50V, 10%, 0603 CAP., X7R, 0.01µF, 16V, 10%, 0402 CAP., X7R, 820pF, 50V, 10%, 0603 MURATA, GRM188R71H683KA93D OPT MURATA, GRM188R71H122KA01D AVX, 0402YC103KAT2A MURATA, GRM188R71H821KA01 CAP., X5R, 470nF, 10V, 10%, 0402 CAP., X7R, 0.1µF, 10V, 10%, 0402 AVX, 0402ZD474KAT2A AVX, 0402ZC104KAT2A CAP., X7R, 1.0µF, 16V, 10%, 0603 CAP., X5R, 1.0µF, 16V, 10%, 0402 CAP., 0402 TDK, C1608X7R1C105K AVX, 0402YD105KAT2A OPT CAP., X7R, 10µF, 25V, 10%, 1206 CAP., X7R, 0.01µF, 6.3V, 10%, 0201 CAP., TANT., 330µF, 10V, 10%, 7343 MURATA, GRM31CR71E106KA12L AVX, 02016C103KAT2A AVX, TPME337K010R0035 dc2248af 9 DEMO MANUAL DC2248A Parts List ITEM 14 15 16 17 18 19 20 21 23 24 25 26 27 28 QTY 0 1 3 1 11 0 3 12 1 2 1 8 2 0 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 6 1 3 1 1 3 5 1 4 5 1 3 1 1 2 1 1 1 1 2 1 REFERENCE C56 D1 D2, D3, D4 D5 E1-E11 E12 JP1, JP2, JP3 J1-J10, J12, J13, J11 J14 J15, J16 L1 L2-L9 R1, RZ R2, R5-R7, R10, R11, R14, R16, R18, R20, R22-R24, R53, R54 R3, R4, R8, R17, R19, R55 R9 R12, R39, R42 R13 R15 R21, R36, R47 R25, R28, R29, R30, R37 R26 R27, R31, R32, R38 R33, R34, R35, R51, R52 R40 R41, R45, R50 R43 R44 R46, R48 R49 SW1 U1 U2 U3, U4 U5 50 1 U6 51 1 U7 52 1 U8 53 1 U9 53 3 SHUNT ON JP1-JP3 PINS 1&2 DC2248A-A Required Circuit Components 1 1 2 1 U1 DC2248A-B Required Circuit Components 1 1 2 1 U1 10 PART DESCRIPTION CAP., 1206 LED, RED, LED-ROHM-SML-010VT LED, GREEN, LED-ROHM-SML-010FT LED, YELLOW, LED-ROHM-SML-010YT TURRET, TESTPOINT 0.064" TURRET, TESTPOINT 0.064" JMP, HD1X3, .079CC CONN., SMA 50-OHM EDGE-LAUNCH CONN., HEADER, 14 PIN, 2mm JACK, BANANA IND., 0Ω, 0805 IND, FERRITE BEAD, L-0603LS-1608 RES., CHIP, 63.4, 1%, 0603 RES., 0402 MANUFACTURER/PART NUMBER OPT ROHM, SML-010VTT86L ROHM, SML-010FTT86L ROHM, SML-010YTT86L MILL-MAX, 2308-2-00-80-00-00-07-0 OPT SULLINS, NRPN031PAEN-RC EMERSON, 142-0701-851 MOLEX, 87831-1420 KEYSTONE, 575-4 VISHAY, CRCW08050000Z0EA TAIYO YUDEN, FBMH1608HL331-T NIC, NRC06F63R4TRF OPT RES., CHIP, 0, 0402 RES., CHIP, 10, 1/16W, 1%, 0402 RES., CHIP, 280 1/16W, 5%, 0402 RES., CHIP, 1k, 1/16W, 1%, 0402 RES., CHIP, 330, 1/16W, 1%, 0402 RES., CHIP, 0Ω, 0603 RES., CHIP, 100Ω 1/16W, 5%, 0402 RES., CHIP, 49.9Ω, 1/16W, 1%, 0402 RES., CHIP, 200k, 1/16W, 1%, 0402 RES., CHIP, 4.99k, 1/16W, 1%, 0402 RES., CHIP, 17.8k, 1/16W, 1%, 0402 RES., CHIP, 10k, 1/16W, 1%, 0402 RES., CHIP, 619Ω 1/16W, 1%, 0402 RES., CHIP, 31.6k, 1/16W, 1%, 0402 RES., CHIP, 1M, 1/16W, 1%, 0402 RES., CHIP, 17.4k, 1/16W, 1%, 0402 SWITCH, SLIDE SPDT 30V 0.2A, SW-EG1218 I.C., QFN40UHF-5X7 I.C., 100MHz OSCILLATOR, OSC-VCXO/CVS575S I.C., DUAL BUFFER, SC70-6 I.C., SINGLE BIT, DUAL SUPPLY, 3-STATE OUTPUT, SOT363 I.C., SERIAL EEPROM, TSSOP8 I.C., 300mA LOW NOISE LDO REGULATOR, MS8 I.C., REG LDO ADJ 0.75A/0.25A, QFN28UFD-4X5 I.C., DUAL 2-INPUT POSITIVE-NAND GATE, US8 SHUNT, 2mm CTRS. VISHAY, CRCW04020000Z0EA VISHAY, CRCW04210ROFKED NIC, NRC04J281TRF NIC, NRC04F1001TRF NIC, NRC04F3300TRF NIC, NRC06Z0TRER NIC, NRC04J101TRF NIC, NRC04F49R9TRF NIC, NRC04F2003TRF NIC, NRC04F4991TRF NIC, NRC04F1782TRF VISHAY, CRCW040210KOFKED NIC, NRC04F6190TRF NIC, NRC04F3162TRF NIC, NRC04F1004TRF NIC, NRC04F1742TRF E-SWITCH, EG1218 LINEAR TECH., LTC6951IUHF CRYSTEK, CCHD-575-25-100.00 FAIRCHILD SEMI., NC7WZ17P6X NXP SEMI., 74LVC1T45GW MICROCHIP, 24LC025-I /ST LINEAR TECH., LT1962EMS8 LINEAR TECH., LT3030EUFD TI, SN74LVC2G00DCU SAMTEC 2SN-BK-G DC2248A2-GENERAL BOM I.C., QFN40UHF-5X7 LINEAR TECH., LTC6951IUHF DC2248A2-GENERAL BOM I.C., QFN40UHF-5X7 LINEAR TECH., LTC6951IUHF-1 dc2248af A B C D __ SYNC SYNC REF+ REF+ REF- SMA J12 EN-XO SMA E3 J13 E2 C33 1uF 5 3 2 1 C31 1uF C30 1uF R21 0 0603 4 5 6 R24 OPT R22 OPT R20 OPT R25 200 R9 10 C12 1uF C8 1uF C7 R4 0 C36 OPT C35 1uF C23 OPT C20 OPT CI2 OPT 0805 RZ 63.4 CI1 0603 68nF 0603 5V L9 R8 FBMH1608HL331-T 0 V+XO 5V 3.3V 4 R26 49.9 R19 0 CP 1.2nF 0603 C37 1uF R23 OPT C21 1uF 0603 0805 4 1. ALL RESISTORS ARE IN OHMS, 0402 2. ALL CAPACITORS ARE IN MICROFARADS, 0402. 18 C16 0.1uF R17 0 C2 820pF 0603 3.3V GND V+VCO BVCO GND CMA CMB CMC GND TB TUNE BB V+RF R1 63.4 32 31 30 29 28 27 26 25 24 23 22 21 L1 0 ohm C13 0.01uF C9 0.01uF 1uF 0603 C5 1uF C3 470nF C1 0.01uF SDO SDI SCLK CS NOTE: UNLESS OTHERWISE SPECIFIED OUT+ GND VCC OUT- 3.3V FBMH1608HL331-T L3 09-30-15 DATE C19 0.01uF TUNE EN VTUNE U2 CCHD-575-25-100 C18 1uF L2 FBMH1608HL331-T C32 1uF C22 10uF 1206 3.3V_REF SMA E12 J11 C34 1uF V+OUT REF- PRODUCTION CHRIS P. APPROVED C29 C28 C27 C26 C25 C24 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0201 0201 0201 0201 0201 0201 V+OUT 2 5 20 SDO DESCRIPTION V+OUT 16 U1 LTC6951 V+D REVISION HISTORY 19 SDI 35 CP SCLK V+REF 36 V+CP 33 17 CS REF37 REF+ 38 1 2 34 15 OUT4+ 3 * R13 1k 3 3.3V R51 4.99K 1 SYNCON 3 D5 YELLOW SYNCON 2 R12 280 R54 OPT THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 SCALE = NONE CHRIS P. KIM T. APPROVALS R18 OPT V+BIAS R16 OPT V+BIAS R14 OPT V+BIAS R11 OPT V+BIAS R10 OPT V+BIAS R7 OPT V+BIAS R6 OPT V+BIAS R5 OPT V+BIAS 1Y * GND ASSY A B 2A 2B 1B 2Y VCC 1A DATE: N/A SIZE GND GND GND GND U1 LTC6951 LTC6951 - 1 C71 0.1uF 3.3V 1 OUT2- OUT2+ OUT1- OUT1+ OUT0- OUT0+ OUT3- OUT3+ OUT4- OUT4+ Fout = 2.5GHz 2.7GHz SMA J10 SMA J9 SMA J8 SMA J7 SMA J6 SMA J5 SMA J4 SMA J3 SMA J2 SMA J1 Wednesday, September 30, 2015 IC NO. 1 SHEET 1 ULTRALOW JITTER MULTI-OUTPUT CLOCK SYNTHESIZER WITH INTEGRATED VCO LTC6951IUHF DEMO CIRCUIT 2248A OF 3 2 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only -1 SUFFIX L8 FBMH1608HL331-T E4 E9 E11 E10 TECHNOLOGY 5 6 7 8 U9 SN74LVC2G00DCU C17 0.1uF C15 0.1uF C14 0.1uF C11 0.1uF C10 0.1uF C6 0.1uF C4 0.1uF C72 0.1uF R3 0 R55 0 TITLE: SCHEMATIC 4 3 2 OFF R53 OPT 1 R52 4.99k 3.3V 2 1 SW1 EG1218 CUSTOMER NOTICE 1 2 3 4 5 6 7 8 9 10 11 12 R2 OPT LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. STATUS D1 RED R15 330 E1 V+OUT OUT2- OUT2+ V+OUT OUT1- OUT1+ V+OUT OUT0- OUT0+ V+OUT OUT3- OUT3+ STATUS 39 STAT 13 OUT4SYNC 14 V+OUT GND 40 GND 41 REV 2 ECO A B C D DEMO MANUAL DC2248A Schematic Diagram 11 dc2248af A B C 5 13 8 GND 3 GND GND 1 V+ 2 5V 6 CS 4 SCK/SCL 7 MOSI/SDA 5 MISO 10 EEVCC 9 EESDA 11 EESCL 12 EEGND 14 AUX WP CS SCLK R34 4.99K EEGND R33 4.99K V+DIG 6 5 7 3 2 1 R35 4.99K SDI SCL SDA WP A2 A1 A0 24LC025-I /ST U6 SDO R36 0 0603 C40 0.1uF 4 NOTE: EEPROM FOR BOARD IDENTIFICATION HD2X7-079-MOLEX ARRAY J14 DC590 SPI INTERFACE 4 EEPROM 8 VCC GND 12 4 D 5 R37 100 3.3V R31 200K R27 200K C42 0.1uF R32 200K 3 2 DIR 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 5 6 3.3V 3.3V 3.3V 2 2 SCALE = NONE CHRIS P. KIM T. APPROVALS 74LVC1T45GW GND VCC(A) VCC(B) U5 5 2 1 4 3 GND VCC 6 1 U4 5 2 NC7WZ17P6X 4 3 GND VCC 6 NC7WZ17P6X 1 U3 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. CUSTOMER NOTICE 3 C41 0.1uF C39 0.1uF R30 100 0.1uF DATE: N/A SIZE Wednesday, September 30, 2015 IC NO. 1 SHEET 2 OF 3 2 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only LTC6951IUHF DEMO CIRCUIT 2248A TECHNOLOGY SDO SDI SCLK CS ULTRALOW JITTER MULTI-OUTPUT CLOCK SYNTHESIZER WITH INTEGRATED VCO TITLE: SCHEMATIC R38 200K C38 R29 100 R28 100 1 A B C D DEMO MANUAL DC2248A Schematic Diagram Note: The buffers shown on sheet 2 of 2 of the schematic are used to protect the LTC6951 when connected to Linduino before the LTC6951 is powered up. There is no need for such circuitry if the SPI bus is not active before powering up the LTC6951. The EEPROM is for identification and is not needed to program the LTC6951. dc2248af Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. A B C E5 E8 C57 10uF 1206 C58 0.1uF C61 10uF 1206 L7 FBMH1608HL331-T C52 10uF 1206 C62 0.1uF C53 0.1uF 5 POWER SUPPLIES J16 GND JACK BANANA JACK BANANA 6V - 9V J15 L5 FBMH1608HL331-T C44 0.1uF 4 OUT ADJ BYP GND IN NC NC SHDN 1 2 3 3.3V 3 2 1 16 17 IN2 IN2 20 21 IN1 IN1 JP3 HD1X3-079 3.3V NC JP2 HD1X3-079 NC 5V LT1962EMS8 5V 5 6 7 14 C43 10uF 1206 U7 4 3 2 1 + C48 330uF 10V 7343 C51 0.01uF R46 1M R44 31.6K C65 OPT + C69 330uF 10V 7343 C70 10uF 1206 3.3V C68 OPT R49 17.4K R48 1M C50 0.01uF 15 8 5V 3 EP + C47 330uF 10V 7343 CUSTOMER NOTICE C46 1uF 0603 3.3V_REF 1 2 3 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 2 SCALE = NONE CHRIS P. KIM T. APPROVALS C66 OPT C63 OPT C59 OPT R43 619 R42 280 R39 280 C54 OPT V+BIAS 5V 3.3V_REF 3.3V NC JP1 HD1X3-079 3.3V_REF 3.3V_REF LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. R50 10K 29 C45 0.01uF LT3030EUFD U8 R45 10K R41 10K R40 17.8K C49 10uF 1206 10 L4 FBMH1608HL331-T 4 8 OUT2 7 OUT2 SHDN2 SHDN1 2 1 OUT1 OUT1 23 9 BYP2 BYP1 28 PWRGD2 22 ADJ2 ADJ1 27 PWRGD1 18 13 12 11 6 5 GND GND GND GND GND GND GND GND GND GND GND GND 19 24 25 26 3 4 D 5 5V GREEN D4 3.3V_REF GREEN D3 3.3V GREEN D2 C56 OPT 1206 2 2 2 DATE: N/A SIZE E7 E6 GND V+REBIAS LTC6951IUHF DEMO CIRCUIT 2248A Wednesday, September 30, 2015 IC NO. 1 SHEET 3 OF 3 2 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only L6 FBMH1608HL331-T TECHNOLOGY R47 0 0603 ULTRALOW JITTER MULTI-OUTPUT CLOCK SYNTHESIZER WITH INTEGRATED VCO TITLE: SCHEMATIC C67 OPT C64 OPT C60 OPT C55 OPT 1 1 1 1 A B C D DEMO MANUAL DC2248A Schematic Diagram dc2248af 13 DEMO MANUAL DC2248A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation 14 Linear Technology Corporation dc2248af LT 1215 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015