DEMO MANUAL DC2610A LTC6953 Ultralow Jitter, 4.5GHz Clock Distributor with 11 Outputs and JESD204B Support DESCRIPTION Demonstration circuit 2610A features the LTC6953, an Ultralow Jitter, 4.5GHz Clock Distributor with 11 Outputs and JESD204B Support. By default, the DC2610A is powered from a single 3.3V supply. An option is provided to power to the DC2610A from dual supplies, allowing for the LTC6953's output supply pins to connect to an LTC Silent Switcher(R) and the LTC6953 input supply pin to connect to a low noise LDO. All differential inputs and seven of the differential outputs are populated with 0.5" spaced SMA connectors. These outputs are AC-coupled with 50 transmission lines making them suitable to drive 50 impedance instruments. The remaining four differential outputs are terminated with 100. The LTC6953's EZSyncTM and SYSREF request functions are made available via the LTC6953 SPI interface or the EZS_SRQ SMA/turret connectors. The DC2609A, DC2610A, and DC2611A SMA placement was designed for ease of connection for all multi-part synchronization and SYSREF request modes. A calibration path is provided to aid in accurate LTC6953 propagation delay measurements. A DC2026 USB serial controller board is used for SPI communication with the LTC6953, controlled by the supplied LTC6952WizardTM software. DC2610 Design files are available. All registered trademarks and trademarks are the property of their respective owners. SINGLE SUPPLY 3.3V INPUT, BANANA JACKS J30 & J31 RIBBON CABLE CONNECTION TO DC590 OR DC2026 EZS_SRQ INPUT, SMA & TURRET STAT LED, D1 IN INPUT, SMA & TURRET OUT10, CML AC-COUPLED OUTPUTS, SMA OUT9, CML AC-COUPLED OUTPUTS, SMA OUT0, CML AC-COUPLED OUTPUTS, SMA LTC6953 DEMO CIRCUIT 2610A OUT8, CML AC-COUPLED OUTPUTS, SMA OUT1, CML AC-COUPLED OUTPUTS, SMA VIN33 OPTION, REFER TO DC2610 RECONFIGURATION OUT5, CML AC-COUPLED OUTPUTS, SMA OUT4, CML AC-COUPLED OUTPUTS, SMA Figure 1. DC2610A Connections Rev 0 1 DEMO MANUAL DC2610A QUICK START PROCEDURE The DC2610A is easy to set up to evaluate the performance of the LTC6953. Follow the procedure below. The LTC6952Wizard and the DC2026 are required to control the DC2610A through a personal computer (PC). DC2026 CONFIGURATION Refer to Figure 2. Set the JP3 jumper to the 3.3V (preferred) or 5V position. Connect the DC2026 to one of your computer's USB ports with the included USB cable. The DC2026 has the ability to run Linduino code, refer to Linduino Design Center and the Frequently Asked Question section (Question #2) for more details. LTC6952WIZARD INSTALLATION The LTC6952Wizard software is used to communicate with the LTC6953. It uses the DC2026 to translate between USB and SPI-compatible serial communications formats. It also includes advanced design and simulation capabilities. The following are the LTC6952Wizard system requirements: * Windows Operating System: Windows XP, Windows 2003 Server, Windows Vista, Windows 7 * Microsoft .NET 3.5 SP1 or later * Windows Installer 3.1 or later * Linear Technology's 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. J5, USB CONNECTION TO PC JP3, SELECT 3.3V OPTION J1, RIBBON CABLE CONNECTION TO DC2610A Figure 2. DC2026 Connector Location Rev 0 2 DEMO MANUAL DC2610A QUICK START PROCEDURE Download the LTC6952Wizard setup file. 4. Run the LTC6952Wizard application. Run the LTC6952Wizard setup file and follow the instructions given on the screen. The setup file will verify and/ or install Microsoft .NET and install the LTC6952Wizard. Refer to the LTC6952Wizard Help menu for software operation. 5. In LTC6952Wizard, click File Load Settings and select file "LTC6953 EZSync StandAlone.6952set". The DC2610A's red STAT LED (D1) should illuminate. DC2610A CONFIGURATION 1. Connect J30 and J31 to a power supply and apply power (see Figure 1 and the Typical DC2610A Requirements and Characteristics). 2. Connect the DC2026 to the DC2610A with the provided ribbon cable. 3. Connect a low phase-noise (low jitter) single-ended signal to IN- (J28). Refer to the LTC6953 data sheet for acceptable input frequencies and amplitudes. 6. From the LTC6952Wizard, update Fin to the frequency of the input signal in step 3. This will update the LTC6952Wizard with the correct output frequencies. 7. Synchronize outputs by toggling the LTC6953 SSYNC bit on then off from the LTC6952Wizard. 8. Connect desired output (OUT10, OUT9, OUT8, OUT5, OUT4, OUT1 or OUT0) to a test instrument or other demo board to evaluate performance. Be sure to power down or terminate any unused RF output with 50, or poor spurious performance may result. Figure 3. LTC6952Wizard Screenshot Rev 0 3 DEMO MANUAL DC2610A TROUBLESHOOTING GUIDE If the red LED (D1) does not illuminate: 1. Ensure LTC6953 input signal is at the LTC6953 IN - pin. 2. In LTC6952Wizard's System tab click `Read All'. LTC6952Wizard should match Figure 3. If not, see `Verify DC2610A and LTC6952Wizard Communication' Verify DC2610A and LTC6952Wizard Communication: To verify communication with the DC2610A. The bottom status line in LTC6952Wizard should read "LTC6953" and "Comm Enabled" as shown in Figure 3. If not, then perform the following steps: 1. Ensure the DC2026 is connected to PC 2. Disconnect and Reconnect DC2026 to PC 3. Ensure DC2026 is connected to DC2610A 4. Close LTC6952Wizard and restart 5. Verify the DC2026 has the DC590B Emulator sketch loaded by contacting the factory or following these steps. a. Download QuikEvalTM. 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 Design Center for instructions on how to start using Linduino. If DC2610A performance is less than the LTC6953 data sheet specifications: 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 low jitter clock outputs. 2. For poor phase noise results, verify the phase noise specifications of the input signal and the phase noise measurement instrument. Traditional signal sources and spectrum analyzers have higher phase noise than the LTC6953 and will degrade measurement results. To measure phase noise performance it is recommended to use a low jitter oscillator and a signal source analyzer, such as Keysight's (previously Agilent/HP) E5052. 3. Contact the factory for further troubleshooting. Rev 0 4 DEMO MANUAL DC2610A DC2610A RECONFIGURATION The following covers the hardware reconfiguration of the DC2610A. Refer to LTC6952Wizard and the LTC6953 data sheet to better understand how to change programmed parameters on the DC2610A. POWER SUPPLY OPTIONS Table 1 provides the power supply options for DC2610A. By default the DC2610A is setup to use the single supply option. However, a dual supply option is available to power the higher current supply from an LTC Silent Switcher, such as the LT8609S. The LTC Silent Switcher improves the power efficiency over the low noise LDO. A low noise LDO is required on the LTC6953's VIN+ supply pin. LTC6953 6952SET FILES The LTC6952Wizard provides a 6952set file for all LTC6953 data sheet application examples and typical application circuits. After loading a 6952set file a pop-up window will detail any user actions and board modifications required for the selected file. SYNC OPTIONS The LTC6953 data sheet describes several synchronization modes. After selecting the desired synchronization mode, refer to Table 3 to identify the required DC2610A board modifications. Refer to the LTC6953 data sheet for SYNC timing and level requirements. Table 1. Power Supply Options CML OUTPUTS, OUT[10:0] Power Supply Voltage/Current (Recommended Supply) Default Option R4 J30 (3.3V) E23 (VIN33) X Single Supply Installed 3.3V/1.5A (Low Noise LDO) NA Dual Supply Do Not Install 3.3V/1.5A (LTC Silent Switcher) 3.3V/150mA (Low Noise LDO) INPUT TERMINATION OPTIONS Table 2 provides the single-ended and differential input termination options. By default the DC2610A is setup for a single-ended input on the IN- SMA (J28). Table 2: Input Termination Options (*) Default Termination R26 R30 R29 R37 C59 F C60 F X SE, IN- 75 30 DNI SE, IN+ 30 75 DNI DNI 0.1 DNI DNI DNI 0.1 DIFF, CML or PECL DNI DNI 160 DNI 0.1 0.1 DIFF, LVDS DNI DNI DNI 160 0.1 0.1 The DC2610A has 11 CML outputs. Seven of these outputs are AC-coupled and brought out to SMAs (OUT10, OUT9, OUT8, OUT5, OUT4, OUT1, and OUT0). To drive 50 impedance instruments connect OUTx+ to the instrument and OUTx- to a 50 termination, or vice versa. The remaining four outputs (OUT7, OUT6, OUT3, and OUT2) are terminated with a 100 resistor on board. To connect these outputs to a 50 instrument, remove the 100 termination, and install the appropriate SMAs and AC blocking capacitors. Refer to LTC6953 data sheet for differential termination options. * SE = Single-Ended, DIFF = Differential, DNI = Do Not Install Rev 0 5 DEMO MANUAL DC2610A DC2610A RECONFIGURATION Table 3. LTC6953 Sync Mode Programming Options Board Modifications (DNI = Do Not Install) SYNC/SYSREF Method EZS_SRQ Pins State R27 () R24 () R25 () R28 () R23 () R39 () R38 () EZS_SRQ Pin Differential, CML or LVPECL DNI DNI 100 0 0 DNI DNI Differential LVDS 100 100 750 50 50 130 130 EZS_SRQ+: CMOS 200k 0 DNI 0 0 DNI DNI 200k 0 DNI 0 0 DNI DNI EZS_SRQ-: GND SSRQ Register Bit EZS_SRQ+: GND EZS_SRQ-: GND FREQUENTLY ASKED QUESTIONS 1. Can the LTC6952Wizard control a LTC6953 on a board other than the DC2610A? Yes, follow these steps. Step 1: Configure the DC2026 for 3.3V SPI as shown in Figure 2 Step 2: Connect the DC2026 J1 connector SPI pins to the LTC6953 SPI pins. Refer to page two of the DC2610A schematic for pin assignments. 2. Does the LTC6953 have Linduino Code available? Yes, download the LTC6953 sketch in the LTSketchbook. To use the LTSketchbook and for instructions on how to start using Linduino refer to the Linduino Design Center. This will give programmers a head start in writing code for the LTC6953. It is recommended to use LTC6952Wizard to create the best possible register settings for all conditions. These LTC6953 register settings from LTC6952Wizard can be programmed in a lookup table. Rev 0 6 DEMO MANUAL DC2610A TYPICAL DC2610A REQUIREMENTS AND CHARACTERISTICS PARAMETER INPUT OR OUTPUT PHYSICAL LOCATION DETAILS 3.3V Power Supply Input J30 and J31 BNC Banana Jacks If R4 Populated, Default Option, Single Supply: 3.3V Low-noise and spur-free supply, 1.5A; If R4 Depopulated, Dual Supply Option, allows for experiments with more efficient power supply evaluation (LTC Silent Switcher). See 3.3V Power Supply #2 (VIN33) 3.3V Power Supply #2 (VIN33) Input E23 turret (VIN33) If R4 Depopulated, Dual Supply Option, 3.3V Lownoise and spur-free supply, 150mA; OUT10+; OUT10- Two Outputs J1 and J2 SMA Connectors* CML, AC-Coupled, 800mVpk Differential OUT9+; OUT9- J3 and J4 SMA Connectors* OUT8+; OUT8- J5 and J6 SMA Connectors* OUT5+; OUT5- J19 and J20 SMA Connectors* OUT4+; OUT4- J17 and J18 SMA Connectors* OUT1+; OUT1- J11 and J12 SMA Connectors* OUT0+; OUT0- OUT7+; OUT7- OUT6+; OUT6- J9 and J10 SMA Connectors* Two Outputs (Not Connected) J7 and J8 (SMA Not Populated) Onboard Differential 100 termination J21 and J22 (SMA Not Populated) OUT3+; OUT3- J15 and J16 (SMA Not Populated) OUT2+; OUT2- J13 and J14 (SMA Not Populated) IN+ Input (Not connected) J29 SMA Connector Default: Not Connected (see Table 2, for correct input termination options) IN- Input J28 SMA Connector Default: Preferred Single Ended Input (see Table 2, for correct input termination options) EZS_SRQ+ Input J27 SMA Connector/E20 Turret Default: Preferred Single Ended Input EZS_SRQ- Input J26 SMA Connector/E19 Turret Default: Shorted to GND ISD Input Test Point 3.3V(Default): Device Active, set by pull-up resistor GND: Shut Down Device STAT Output STATUS Turret Red LED D1 illuminates when STAT pin in high state *Any unused RF output must be powered down or terminated with 50, or poor spurious performance may result. ASSEMBLY OPTIONS Table 5. DC2610A Options Assembly Version Part Number DC2610A-A LTC6953IUKG Rev 0 7 DEMO MANUAL DC2610A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 24 C1-C12, C17-C20, C51-C59, C61 CAP., X7R, 0.1F, 10V, 10%, 0402 MURATA, GRM155R71A104KA01D 2 0 C7, C8, C13-C16, C21, C22, C60 CAP., 0402 OPT 3 13 C24-C36 CAP., X7R, 0.01F, 6.3V, 10%, 0201 MURATA, GRM033R70J103KA01D 4 1 C37 CAP., X5R, 0.1F, 16V, 10%, 0201 MURATA, GRM033R61C104KE14D 5 11 C38-C48 CAP., X5R, 1F, 16V, 10%, 0402 MURATA, GRM155R61C105KE01D 6 1 C49 CAP., X7R, 10F, 25V, 10%, 1206 MURATA, GRM31CR71E106KA12L 7 1 C62 CAP.,TANT., 330F,10V, 10%, 7343 AVX, TPME337K010R0035 8 1 D1 LED, RED, LED-ROHM-SML-01 ROHM, SML-012V8TT86 9 10 E14-E23 TURRET, TESTPOINT 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0 10 1 JP1 CONN., HEADER, MALE, 1 x 3, 2mm, THT Wurth Elektronik, 62000311121 11 20 J1-J6, J9-J12, J17-J20, J24-J29 CONN., SMA 50 EDGE-LAUNCH CCSJ, 142-0701-851 12 0 J7, J8, J13-J16, J21, J22 CONN., SMA 50 EDGE-LAUNCH OPT 13 1 J23 CONN., HEADER, 14-PIN, 2mm MOLEX, 87831-1420 14 2 J30, J31 CONN, JACK, BANANA KEYSTONE, 575-4 15 5 R4, R19, R23, R24, R28 RES., CHIP, 0, 1/10W, 0402 VISHAY, CRCW04020000Z0ED 16 6 R6, R10, R11, R21, R27, R36 RES., CHIP, 200K, 1/10W, 1% 0402 VISHAY, CRCW0402200KFKED 17 9 R7-R9, R18, R31-R35 RES., CHIP, 100, 1/16W, 1% 0402 VISHAY, CRCW0402100RFKED 18 3 R12, R13, R14 RES., CHIP, 4.99K, 1/10W, 1% 0402 VISHAY, CRCW04024K99FKED 19 0 R15, R29, R37, R38, R39 RES., 0402 OPT 20 1 R20 RES., CHIP, 0, 1/10W, 0603 VISHAY, CRCW06030000Z0EA 21 1 R22 RES., CHIP, 330, 1/16W, 1% 0402 VISHAY, CRCW0402330RFKED 22 0 R25 RES., CHIP, 100, 1/16W, 1% 0402 OPT 23 1 R26 RES., CHIP, 75, 1/16W, 1% 0402 VISHAY, CRCW040275R0FKED 24 1 R30 RES., CHIP, 30, 1/16W, 1% 0402 VISHAY, CRCW040230R0FKED 25 1 U1 I.C., QFN52UKG-7 x 8 LINEAR TECH., LTC6953IUKG#PBF 26 1 U2 I.C., Serial EEPROM, TSSOP8 MICROCHIP, 24LC025-I /ST 27 2 U3,U4 I.C., Dual Buffer, SC70-6 FAIRCHILD SEMI., NC7WZ17P6X 28 1 U5 I.C., Single Bit, Dual Supply, 3-State Output, SOT363 NXP SEMI., 74LVC1T45GW,125 29 1 SHUNT ON JP1 (1&2) SHUNT, 2mm Wurth Elektronik, 60800213421 30 4 MH1-MH4 STANDOFF, NYLON, 0.5, 1/2" Wurth Elektronik, 702935000 31 1 DUST CAP FOR J29 WYHP DUST CAP FOR SMA FEMALE RF CONN AMAZON, Rev 0 8 A B C D SMA C57 0.1uF J25 CAL_IN SMA VIN33 GND E17 E18 E23 E22 VIN33 + 5 C36 0.01uF 0201 KEY-575 J31 E21 E15 E16 KEY-575 J30 GND GND GND GND GND E14 J8 OPT SMA OUT7+ 3.3V J7 OPT SMA SMA OUT7- J6 SMA OUT8+ OUT8- SMA J5 J4 SMA OUT9+ OUT9- SMA J3 J2 SMA OUT10+ OUT10- J1 C37 0.1uF 0201 R4 0 C62 330uF 10V 7343 C8 OPT C7 OPT C6 0.1uF C5 0.1uF C4 0.1uF C3 0.1uF C2 0.1uF C1 0.1uF 3.3V C49 10uF 1206 3.3V R32 100 3.3V 3.3V 3.3V 3.3V 3.3V PLACE ON TOP SIDE CS SCLK SDO SDI 14 13 12 11 10 9 8 7 6 5 4 3 2 1 STAT 1 LED 2 JP1 3 NC HD1X3-079 VOUT+ OUT7+ OUT7- VOUT+ OUT8+ OUT8- VOUT+ OUT9+ OUT9- VOUT+ OUT10+ OUT10- VD+ CS STAT D1 RED R22 330 STAT 3.3V LTC6953 U1 3.3V C38 1uF 3.3V C39 1uF C40 1uF 4 C42 1uF C43 1uF C44 1uF PLACE ON BOTTOM SIDE C41 1uF C45 1uF C46 1uF C47 1uF C48 1uF 3 VIN33 EZS_SRQ+ EZS_SRQ- C24 C27 C29 C30 C26 C33 C25 C28 C31 C32 C34 C35 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 0201 0201 0201 0201 0201 0201 0201 0201 0201 0201 0201 0201 3.3V 3.3V SUPPLIES OUT7+ OUT7- OUT8+ OUT8- OUT9+ OUT9- OUT10+ OUT10- ALL INPUT AND OUTPUT CONNECTIONS ARE SAME LENGTH, 50 OHM CONTROLLED IMPEDANCE, USING 20 MIL TRACES, 20 MIL GAP. CAL_OUT C56 0.1uF 1 2 15 J24 4 53 EP 50 SDI 51 SDO OUT6- 52 SCLK OUT6+ 17 VOUT+ 16 47 20 OUT5+ 19 VOUT+ 21 49 STAT 48 EZS_SRQ- 44 3.3V 23 OUT422 OUT5- 18 EZS_SRQ+ 46 NC 45 NC OUT4+ 43 VREF+ VOUT+ VIN33 3 OUT2- OUT2+ VOUT+ OUT1- OUT1+ VOUT+ OUT0- OUT0+ VOUT+ NC IN+ IN- VIN+ SD 3.3V 27 28 29 30 31 32 33 34 35 36 37 38 39 40 R28 0 R39 OPT R38 OPT R23 0 3.3V 3.3V 3.3V VIN33 R25 100 OPT OUT6- OUT6+ OUT5- OUT5+ OUT4- OUT4+ OUT3- OUT3+ OUT2- OUT2+ OUT1- OUT1+ OUT0- OUT0+ IN+ IN- SD R27 200k R24 0 SMA EZS_SRQ+ EZS_SRQ- SMA EZS_SRQ+ J27 E20 2 EZS_SRQ- J26 E19 R30 OPT 30 75 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 SCALE = NONE CHRIS P. KIM T. APPROVALS C59 C60 0.1uF 0.1uF 0.1uF OPT OPT 0.1uF 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 R26 R29 DIFFERENTIAL OPT 160 S-E IN- (DEFAULT) 75 OPT S-E IN+ 30 OPT IN-/IN+ TERMINATIONS OPTIONS [3]. COMPONENTS WILL BE STUFFED WITH DEFAULT VALUES. OTHER VALUES ARE FOR LAB USED ONLY. [2]. J29 = INSTALLED BUT UNUSED. 1. ALL RESISTORS AND CAPACITORS ARE 0402. NOTES: UNLESS OTHERWISE SPECIFIED 24 NC 42 NC OUT3- 41 GND VOUT+ 26 OUT3+ 25 5 DATE: N/A SIZE C58 0.1uF [3] [3] [3] C13 OPT C12 0.1uF C11 0.1uF C10 0.1uF C9 0.1uF R37 OPT OPT OPT OPT OPT OPT OPT SMA LTC6953IUKG 1 DEMO CIRCUIT 2610A Tuesday, March 21, 2017 IC NO. SHEET 1 OF OUT6- OUT6+ SMA OUT5SMA OUT5+ SMA OUT4SMA OUT4+ SMA OUT3SMA OUT3+ SMA OUT2SMA OUT2+ SMA OUT1SMA OUT1+ SMA OUT0SMA OUT0+ SMA J22 J21 J20 J19 J18 J17 J16 J15 J14 J13 J12 J11 J10 J9 SMA IN+ IN- SMA J29 [2] J28 DATE 2 2 REV. 0 3 - 2 1 -1 7 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only R34 100 C22 OPT C21 OPT C20 0.1uF C19 0.1uF C18 0.1uF C17 0.1uF R33 100 C16 OPT C15 OPT R31 100 C14 OPT [3] C60 OPT [3] C59 0.1uF CHRIS P. APPROVED ULTRALOW JITTER CLOCK DISTRIBUTOR WITH 11 OUTPUTS AND JESD204B SUPPORT C61 0.1uF R30 30 R29 OPT R26 75 2ND PROTOTYPE 2 1 REVISION HISTORY DESCRIPTION REV TITLE: SCHEMATIC __ ECO A B C D DEMO MANUAL DC2610A SCHEMATIC DIAGRAM Rev 0 9 5 1 V+ 2 5V 6 CS 4 SCK/SCL 7 MOSI/SDA 5 MISO 10 EEVCC 9 EESDA 11 EESCL 12 EEGND 14 AUX R15 OPT SD WP CS SCLK R13 4.99k 6 5 7 3 2 1 R14 4.99k SDI SCL SDA WP A2 A1 A0 24LC025-I /ST U2 SDO R20 0 0603 C53 0.1uF 4 R18 100 C54 0.1uF R11 200k CUSTOMER NOTICE R36 200k 3.3V 3 2 1 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 6 DIR 4 5 6 2 SCALE = NONE CHRIS P. KIM T. APPROVALS GND VCC(A) VCC(B) U5 GND VCC 74LVC1T45GW 2 3 1 U4 5 NC7WZ17P6X GND VCC 4 3 2 6 1 NC7WZ17P6X 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. EEPROM FOR BOARD IDENTIFICATION EEGND R12 4.99k V+DIG R10 200k R6 200k 3.3V 2 R19 0 R35 100 R9 100 DATE: N/A SIZE LTC6953IUKG 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only SDO SD SDI SCLK CS 1 DEMO CIRCUIT 2610A Tuesday, March 21, 2017 IC NO. SHEET ULTRALOW JITTER CLOCK DISTRIBUTOR WITH 11 OUTPUTS AND JESD204B SUPPORT TITLE: SCHEMATIC R21 200k C55 0.1uF 3.3V C52 0.1uF 3.3V C51 0.1uF 3.3V R8 100 R7 100 1 2 OF 2 2 REV. A B C D Note: The buffers shown on sheet 2 of 2 of the schematic are used to protect the LTC6953 when connected to the DC2026 before the LTC6953 is powered up. There is no need for such circuitry if the SPI bus is not active before powering up the LTC6953. The EEPROM is for identification and is not needed to program the LTC6953. A B C J23 HD2X7-079-MOLEX 3 DC2026 (DC590) SPI INTERFACE ARRAY D 13 8 GND 3 GND GND 4 EEPROM 8 VCC GND 10 4 5 DEMO MANUAL DC2610A SCHEMATIC DIAGRAM Rev 0 DEMO MANUAL DC2610A LAYOUT TOP LAYER Rev 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 11 DEMO MANUAL DC2610A ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. 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