DEMO MANUAL DC1649A LTC6945 Ultralow Noise and Spurious Integer-N Synthesizer DESCRIPTION

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1 DESCRIPTION Demonstration circuit 9A features the LTC 9, an ultralow noise and spurious integer-n synthesizer. DC9A provides 0Ω SMA connectors for the reference frequency (REF+), the reference output buffer (REFO), and the two single-ended RF outputs (RF+ and RF ). DEMO MANUAL DC9A LTC9 Ultralow Noise and Spurious Integer-N Synthesizer Demonstration circuit 90 is used for SPI communication with the LTC9, controlled by the supplied PLLWizard software. Design files for this circuit board are available at L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PLLWizard and QuikEval are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Figure. DC9A Inputs and Outputs dc9afa

2 DEMO MANUAL DC9A TYPICAL DC9A REQUIREMENTS AND CHARACTERISTICS PARAMETER INPUT OR OUTPUT PHYSICAL LOCATION DETAILS Power Supply Input J9 and J0 Banana Jacks Low Noise and Spur-Free, 9mA V Charge Pump Power Supply Input J and J Banana Jacks Low Noise and Spur-Free V, ma V VCO Power Supply Input V+VCO Turret Low Noise and Spur-Free V, ma REF+, Reference Frequency Input J SMA Connector Low Noise 0MHz or 00MHz*, dbm into 0Ω, See Note REFO, Buffered Reference Output J SMA Connector Frequency = f REF, 0dBm RF+ and RF Two Outputs J and J SMA Connectors 90MHz to 9MHz* in 0kHz* Steps, 0dBm Loop Bandwidth Set by Loop Filter Component Values khz* *These frequencies are for the DC9A-0MHz.pllset or DC9A-00MHz.pllset files and included VCO. Note : A low noise 0MHz or 00MHz reference frequency, such as the Wenzel 0-00A or 0-0D OCXO, is recommended. If using a different frequency, make sure to update the Fref and R_DIV boxes under the System tab in PLLWizard so that Fpfd is still 0kHz. For example, if a 0MHz clock is used, Fref should be changed to 0MHz and R_DIV to 0. Ref BST and FILT under the System tab in PLLWizard might need to be changed if the reference frequency and/or power is different than what is recommended in the table above. More information can be found in the LTC9 data sheet. QUICK START PROCEDURE The DC90 and PLLWizard application are required to control the DC9A through a personal computer (PC). DC90B Configuration The DC90 s QuikEval drivers must be installed before the DC90 will be able to communicate with the LTC9. To configure the DC90, follow the procedure below, starting with Step. If you have already installed the DC90 software previously, skip to Step. Note: Once the QuikEval software is installed, the application Does Not need to be executed to run PLLWizard or to control the DC9A.. Do Not plug in the DC90 before running the installation program.. Download the QuikEval installation program from Run the QuikEval installation program and follow the on-screen instructions. More detailed installation information may be found in the DC90 s Quick Start guide.. Exit the QuikEval program once the installation is complete, as it is not needed to run the PLLWizard software.. Place the DC90 jumpers in the following positions: JP - EE Must be in the EN position. JP - ISO ON must be selected. JP - SW ON must be selected. JP - VCCIO must be selected. This sets the SPI port to operation.. Connect the DC90 to one of your computer s USB ports with the included USB cable. dc9afa

3 DEMO MANUAL DC9A QUICK START PROCEDURE Figure. DC90 Jumper and Connector Locations PLLWizard Installation The PLLWizard software is used to communicate with the LTC9 synthesizer. It uses the DC90 to translate between USB and SPI-compatible serial communications formats. It also includes advanced PLL design and simulation capabilities. The following are the PLLWizard system requirements: n Windows Operating System: Windows XP, Windows 00 Server, Windows Vista, Windows n Microsoft.NET.0 or later n Windows Installer. or later n Linear Technology s QuikEval and DC90 hardware Microsoft.NET You must have Microsoft.NET.0 or later installed on your computer. PLLWizard will not run without it. Note that Windows Vista and Windows have at least version. preinstalled. To manually determine your version of.net using Windows XP, click Start Menu Settings Control Panel Add or Remove Programs Depending upon your.net version, choose one of two PLLWizard setup programs, downloaded from Either setup program will automatically install Microsoft.NET if a compatible.net version is not found. But, the installation source depends upon which file you downloaded from Linear Technology s website. You should pick one of the following two choices, depending upon your version of.net. dc9afa

4 DEMO MANUAL DC9A QUICK START PROCEDURE Table. PLLWizard Installation File FILE PLLWizardSetup.exe PLLWizardSetup_net0.exe.NET.0 SOURCE latest version downloaded from Microsoft.0 SP included (much larger file size) n Choose PLLWizardSetup if you have.net.0 or later, have Windows Vista or Windows, or if you have less than.net.0 but want the latest.net installed. n Choose PLLWizardSetup_net0 if you have less than.net.0, and want faster installation (no additional Microsoft downloads are needed, but the file size is much larger). The setup file will verify and/or install Microsoft.NET and install PLLWizard. Refer to the Help menu for software operation. Figure. PLLWizard Screenshot DC9A Configuration. Connect an appropriate reference frequency source (at J) and signal analyzers (at J and/or J) using the SMA connectors (see Figure and the Typical DC9A Requirements and Characteristics table).. Choose the MUTE jumper setting: JP - / MUTE position. Select to mute the RF output, to un-mute.. Connect the,, and V banana jacks and the V+VCO turret to a power supply and apply power (see Figure and the Typical DC9A Requirements and Characteristics table).. Connect the DC90 to the DC9A with the provided ribbon cable.. Run the PLLWizard application.. In PLLWizard, click File Load Settings and point to the DC9A-0MHz.pllset or DC9A-00MHz.pllset file found in the PLLWizard installation directory (typically Program Files LTC PLLWizard Set Files). The red LED on DC9A should turn on indicating that the loop is locked at 9MHz. Troubleshooting If the red LED does not illuminate, follow the instructions below:. Verify that you are able to communicate with the DC9A. The bottom status line in PLLWizard should read LTC9 and Comm Enabled. Refer to PLL- Wizard s Troubleshoot and Help if not.. Verify that the, V and V+VCO have the correct voltages on them and that the reference frequency is applied to the REF+ SMA input. If the red LED is on but you cannot detect an RF output, make sure jumper JP is at the position. Run Help Troubleshoot in PLLWizard if the problem is not resolved. dc9afa

5 DEMO MANUAL DC9A DC9A RECONFIGURATION DC9A is flexible and allows the use of a variety of VCOs and the choice to employ either an active or passive loop filter. The following covers the hardware reconfiguration of DC9A. Refer to PLLWizard s Help and the LTC9 data sheet to better understand how to change programmed parameters on the DC9A. Installing Different Tunable Devices DC9A permits the use of different tunable oscillators, like VCOs and VCXOs. There are two different oscillator footprints on the board: U, which accommodates the popular 0.in 0.in package, and U, which accommodates another common mm 9mm package with four or six pins. An external connectorized VCO can also drive the LTC9 through J. Table gives options to customize the DC9 s VCOs. When using an active loop filter, an additional pole is required in the to limit the op amp s noise contribution to the VCO phase noise. Selecting Loop Filter Type DC9A can use either an active or a passive, depending upon the application. Some VCO tuning voltage ranges are greater than the LTC9 charge pump voltage range (refer to the LTC9 data sheet). In such cases, an active using an op amp can deliver the required tuning voltage. Table summarizes these options. PLLWizard helps determine the component values listed in this table. Table. Oscillator Options TUNABLE DEVICE U U SELECTION COMPONENTS C 00pF, depopulate R, C and C C 00pF, depopulate R0, C and C External C 00pF, R = 0Ω, depopulate R, C and C RESISTOR FOR ADDITIONAL POLE R0 = 0Ω for passive R0 00Ω for active R = 0Ω for passive R 00Ω for active CAPACITOR FOR ADDITIONAL POLE C = Open for passive Pick C such that /(π R0 C) the loop bandwidth in Hz for active C = Open for passive Pick C such that /(π R C) the loop bandwidth in Hz for active POWER Determined by U device power supply specification, up to V applied to V+VCO turret Determined by U device power supply specification, up to V applied to V+VCXO turret ENABLE PIN OR REMARKS Use EN turret to control pin of U Selection components are for an active loop filter. Connect the external VCO output to J. Use CPGAIN to tune the external device Table. Loop Filter Options LOOP FILTER TYPE SELECTION RESISTORS RZ FROM PLLWizard CI FROM PLLWizard CP FROM PLLWizard POWER CPINV BOX, SYSTEM TAB IN PLLWizard Passive R and R = 0Ω, depopulate R and R RZ_P CI_P in parallel with CI_P CP_P None Unchecked Active R (except when using an external VCO) and R = 0Ω, depopulate R and R RZ_A CI_A in parallel with CI_A CP_A Determined by the maximum allowed tune voltage of the populated VCO (U or U), up to V applied to V+OA turret Checked dc9afa

6 DEMO MANUAL DC9A PARTS LIST Number of Boards = ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 0 CI_P, CI_A, C, C, CP_A Opt., 0 CI_A Opt., 0 CI_P Cap., C0G, 0.μF, 0V, %, 0 Murata, GRMCCH0JA0L CP_P Cap., XR, 00pF, 0V, 0%, Murata, GRMRHKA0D C, C9, C Cap., Tantalum, μf, V, 0%, AVX, TAJVK0RNJ C, C, C, C Cap., XR, 0.μF, 0V, 0%, 00 AVX, 00C0KATA C, C Cap., Tantalum, 0μF, 0V, 0%, AVX, TPMEK00R00 0 C, C, C, C, C0, C, C9, Cap., XR, 0.μF, 0V, 0%, 00 AVX, 00ZD0KATA C, C, C 9 C, C, C, C Cap., XR, μf, 0V, 0%, 00 AVX, 00ZD0KATA 0 C Cap., Tantalum, μf, 0V, 0%, AVX, TAJDK00RNJ C, C Cap., XR, 0pF, 0V, 0%, 00 AVX, 00CKATA C, C, C Cap., XR, 0.0μF, V, 0%, 00 AVX, 00YC0KATA 0 C, C Opt., 00 C, C9, C, C, C Cap., NPO, 00pF, V, 0%, 00 AVX, 00YA0KATA D LED, RED Panasonic, LNCTR 0 E, E, E-E Turret, Testpoint, 0 Mill-Max, JP Headers, Pins, mm Ctrs. Samtec, TMM-0-0-L-S XJP Shunt, mm Ctrs. Samtec, SN-BK-G 9 J, J, J, J, J Con., SMA 0Ω Edge-Launch E. F. Johnson, J, J Con., SMA 0Ω Straight Mount Opt. J Con., Header, Pin, mm Molex, -0 J9, J0, J, J Jack, Banana Keystone, - 0 L Opt., 00 L, L Ind., Wirebound, nh, ±%, 00 Coilcraft, 00HPH-NXJL RZ_P Res., Chip, 0, /0W, %, Vishay, CRCW0RFKEA R, R, R, R, R Res., Chip,.99k, /W, %, 00 Vishay, CRCW00K99FKED R Res., Chip, 0, /W, %, 00 Vishay, CRCW000RFKED R Res., Chip,., /W, %, 00 Vishay, CRCW00RFKED 9 R, R, R, R9 Res., Chip, 00k, /W, %, 00 Vishay, CRCW0000KFKED 0 R9, R0, R, R Res., Chip, 0Ω, Vishay, CRCW0000Z0EA R, R, R Res., Chip, 00, /W, %, 00 Vishay, CRCW0000RFKED 0 R, R, R, RZ_A Opt., 0 R, R Res., Chip, 00, Opt. U I.C. LTC9IUFD, QFNUFD Linear Technology Corp., LTC9IUFD U Low Noise Amp, S0- Linear Technology Corp., LTCS#PBF U ( Reel + Tape, PbF) Voltage Controlled Oscillator VC0 Crystek, CVCOCL U Crystal Oscillator, Opt. U, U I.C., Dual Buffer, SC-0 -Lead Fairchild Semi., NCWZPX 9 U I.C., Dual Transceiver, SC-0 -Lead NXP, LVCTGW 0 U I.C., Serial EEPROM, TSSOP- Mircochip, LCA-I/ST Corners Standoff, Nylon, 0.0, /" Keystone, (Snap On) Stencils (Top and Bottom) Stencil, DC9A- dc9afa

7 DEMO MANUAL DC9A SCHEMATIC DIAGRAM REVISION HISTORY ECO REV DESCRIPTION APPROVED DATE PRODUCTION MICHEL A. -0- V+OA V C.0uF R.99K CP V+OA R.99K E E uf V + C U LTIS V A A CP J V C 00 C 00 J A J V+ OUTB -INB +INB OUTA -INA +INA V- C.0uF C 0uF 0V J9 B uf 0V + C R C + CPGAIN J0 E CPGAIN R 0 J V+VCO R R 0 V C V+VCO CP_A RZ_A CI_A CI_A 0 REF+ J R. C 0pF REF0 J E C C.0uF 00 B B RZ_P 0 + C 0uF 0V C D LNC CI_P CP_P 00pF R 0 E C 0pF V+VCXO STATUS V+VCXO E uf V V+VCO +C R CI_P 0 E 9 C9 uf V C 0.0uF G V+CP CP V+REF REF+ REF- R0 0 + VCC E C BB V+RF RF+ 0 McCarthy Blvd. RF- RF+ VCO APPROVALS Milpitas, CA 90 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A Phone: (0) A CVCOCL MHz CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; TECHNOLOGY Fax: (0)-00 HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. KIM T. LTC Confidential-For Customer Use Only D D VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. MICHEL A. TITLE: SCHEMATIC CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT NOTE: UNLESS OTHERWISE SPECIFIED PERFORMANCE OR RELIABILITY. CONTACT LINEAR ULTRALOW NOISE AND SPURIOUS INTEGER-N SYNTHESIZER TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. SIZE IC NO. REV. V+REFO V+VCO C C U REFO F 00 E STAT E 00 CS * 0 U VTUNE VCC CS D 9 U R EN NC SCLK SCLK C LTC9IUFD RFOUT SDI SDI B R SDO SDO VCO+ VCO- C VTUNE 00pF C 00pF 0 E C C9 RFOUT C V+D EN 00pF 9 RF- A MUTE C0 C C C.0uF 0 9 C C 0.0uF MUTE EXT VCO IN J L L nh nh JP L C 0.0uF C 00pF C 00pF * ASSY U CUSTOMER NOTICE J J LTC9IUFD DEMO CIRCUIT 9A N/A. ALL RESISTORS ARE IN OHMS, 00 ALL CAPACITORS ARE IN MICROFARADS, 00. /0/0, 0: PM SHEET OF DATE: THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE dc9afa

8 DEMO MANUAL DC9A SCHEMATIC DIAGRAM A B C D E DC90B SPI INTERFACE R9 00K U NCWZPX R 00 CS J HDX-09-MOLEX V+ V MOSI/SDA MISO CS SCK/SCL V+DIG CS SCLK SDI SDO VCC U NCWZPX R 00 C R 00 SCLK SDI EEVCC 0 9 EESDA EESCL EE AUX R.99K R.99K R.99K.99K VCC U LC0-I /ST R 00K C ARRAY EEPROM VCC SCL SDA WP A A A0 C R 00K C U LVCTGW VCC(A) VCC(B) DIR C9 WP EE R9 0 R 00K SDO NOTE: EEPROM FOR BOARD IDENTIFICATION CUSTOMER NOTICE APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; TECHNOLOGY Fax: (0)-00 HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. KIM T. LTC Confidential-For Customer Use Only VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. MICHEL A. TITLE: SCHEMATIC CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR ULTRALOW NOISE AND SPURIOUS INTEGER-N SYNTHESIZER TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE A B C D E SIZE N/A DATE: IC NO. 0 McCarthy Blvd. Milpitas, CA 90 Phone: (0)-900 LTC9IUFD DEMO CIRCUIT 9A /0/0, 0: PM SHEET OF REV. Note: The buffers shown on sheet of of the schematic are used to protect the LTC9 when communicating to it starts before powering it up. There is no need for such circuitry if the SPI bus is not active before powering up the LTC9. The EEPROM is for identification and is not needed to program the LTC9. dc9afa

9 LAYOUT TOP LAYER DEMO MANUAL DC9A The top metal layer of DC9A is shown here as an example of good PCB layout for the LTC9. 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. dc9afa 9

10 DEMO MANUAL DC9A 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 0 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 0 McCarthy Blvd. Milpitas, CA 90 Copyright 00, Linear Technology Corporation 0 dc9afa LT 0 REV A PRINTED IN USA Linear Technology Corporation 0 McCarthy Blvd., Milpitas, CA 90- (0) -900 FAX: (0) LINEAR TECHNOLOGY CORPORATION 0