DEMO MANUAL DC1705A LTC6946 Ultralow Noise and Spurious Integer-N Frequency Synthesizer with Integrated VCO DESCRIPTION DC1705A features the LTC(R)6946, an ultralow noise and spurious integer-N frequency synthesizer with integrated VCO. The VCO uses no external components and is internally calibrated without external system support. There are three versions of the DC1705A, one for each version of the LTC6946. The DC1705A-A contains the LTC6946-1, the DC1705A-B incorporates the LTC6946-2 and DC1705A-C uses the LTC6946-3. Each DC1705A provides 50 SMA connectors for the reference frequency input, fREF, the reference output buffer (REF OUT), and the differential RF output (RF+ and RF -). A DC590 USB serial controller board is used for SPI communication with the LTC6946, controlled by the supplied PLLWizardTM software. Design files for this circuit board are available at http://www.linear.com/demo 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 1. Proper Measurement Equipment Setup dc1705afa 1 DEMO MANUAL DC1705A TYPICAL DC1705A REQUIREMENTS AND CHARACTERISTICS PARAMETER INPUT OR OUTPUT PHYSICAL LOCATION 3.3V Power Supply Input 3.3V and GND Banana Jacks 5V Power Supply Input 5V and GND Banana Jacks REF+ IN, Reference Frequency Input J1 SMA Connector REF OUT, Buffered Reference RF+ and RF - Loop Bandwidth Output J3 SMA Connector Two Outputs J4 and J5 SMA Connectors - DETAILS Low Noise and Spur-Free 3.3V, 115mA Low Noise and Spur-Free 5V, 45mA Low Noise 10MHz or 100MHz*, 6dBm into 50 (Note 1) Frequency = fREF, 0dBm Frequency: 900MHz*, Power: 0dBm, Frequency Range: Depends on the version of the LTC6946 device - refer to Table 1, Step Size: 200kHz* Set by Loop Filter Component Values 47kHz* * These frequencies are for the DC1705A pllset files included with PLLWizard. Note 1: A low noise 10MHz or 100MHz reference frequency, such as the Wenzel 501-04608A or 501-04516D 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 1MHz. For example, if a 20MHz clock is used, fREF should be changed to 20MHz and R_DIV to 20. 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 LTC6946 data sheet. Table 1. DC1705A Options and Frequency Ranges ASSEMBLY VERSION PART NUMBER VCO FREQUENCY RANGE (GHz) OUTPUT DIVIDER SETTINGS DC1705A-A LTC6946IUFD-1 2.240 to 3.740 Integers 1 through 6 DC1705A-B LTC6946IUFD-2 3.080 to 4.910 Integers 1 through 6 DC1705A-C LTC6946IUFD-3 3.840 to 5.790 Integers 1 through 6 QUICK START PROCEDURE The DC590 and PLLWizard application are required to control the DC1705A through a personal computer (PC). DC590 Configuration The DC590's QuikEvalTM drivers must be installed before the DC590 will be able to communicate with the LTC6946. To configure the DC590, follow the procedure below, starting with step 1. If you have already installed the DC590 software previously, skip to step 5. Note: Once the QuikEval software is installed, the application does not need to be executed to run PLLWizard or to control the DC1705A. 1. Do Not plug in the DC590 before running the installation program. 2. Download the QuikEval installation program from http://www.linear.com/software. 3. Run the QuikEval installation program and follow the on-screen instructions. More detailed installation information may be found in the DC590's Quick Start guide. 4. Exit the QuikEval program once the installation is complete, as it is not needed to run the PLLWizard software. 5. Place the DC590 jumpers in the following positions: JP4 EE Must be in the "EN" position. JP5 ISO "ON" must be selected. JP5 SW "ON" must be selected. JP6 VCCIO "3.3V" must be selected. This sets the SPI port to 3.3V operation. 6. Connect the DC590 to one of your computer's USB ports with the included USB cable. dc1705afa 2 DEMO MANUAL DC1705A QUICK START PROCEDURE Figure 2. DC590 Jumper Locations PLLWizard Installation Microsoft .NET The PLLWizard software is used to communicate with the LTC6946 synthesizer. It uses the DC590 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: You must have Microsoft .NET 2.0 or later installed on your computer. PLLWizard will not run without it. Note that with Windows Vista and Windows 7 have at least version 3.5 pre-installed. * Windows Operating System: Windows XP, Windows 2003 Server, Windows Vista, Windows 7 * Microsoft .NET 2.0 or later * Windows Installer 3.1 or later 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 http://www.linear.com/software. * Linear Technology's QuikEval and DC590 hardware dc1705afa 3 DEMO MANUAL DC1705A QUICK START PROCEDURE 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. Table 2. PLLWizard Installation File FILE .NET 2.0 SOURCE PLLWizardSetup.exe Latest Version Downloaded from Microsoft PLLWizardSetup_net20.exe 2.0 SP2 Included (Much Larger File Size) * Choose PLLWizardSetup if you have .NET 2.0 or later, have Windows Vista or Windows 7, or if you have less than .NET 2.0 but want the latest .NET installed. * Choose PLLWizardSetup_net20 if you have less than .NET 2.0, 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 3. PLLWizard Screenshot dc1705afa 4 DEMO MANUAL DC1705A QUICK START PROCEDURE DC1705A Configuration 1. Connect an appropriate reference frequency source (at J1) and signal analyzers (at J4 and/or J5) using the SMA connectors (see Figure 1 and the Typical DC1705A Requirements and Characteristics table). 2. Choose the MUTE jumper setting: JP1 - GND/3.3V MUTE position. Select GND to mute the RF output, 3.3V to un-mute. 3. Connect the GND, 3.3V and 5V banana jacks to a power supply and apply power (see Figure 1 and the Typical DC1705A Requirements and Characteristics table). 4. Connect the DC590 to the DC1705A with the provided ribbon cable. 5. Run the PLLWizard application. 6. In PLLWizard, click File Load Settings and point to the appropriate pllset file. For example, if you are using a 10MHz reference with a DC1705A-B to evaluate the LTC6946-2, load the "DC1705A-B (LTC6946-2) 10MHz Ref.pllset" file found in the PLLWizard installation directory (typically Program Files LTC PLLWizard Set Files). You can then change the values of N_DIV and/or O_DIV in PLLWizard to change the output frequency. Troubleshooting If the red LED does not illuminate, follow the instructions below: 1. Verify that you are able to communicate with the DC1705A. The bottom status line in PLLWizard should read "LTC6946" and "Comm Enabled." Refer to PLLWizard's Troubleshoot and Help if not. 2. Verify that the 3.3V and 5V have the correct voltages on them and that the reference frequency is applied to the REF + IN SMA input. If the red LED is on but you cannot detect an RF output, make sure jumper JP1 is at the 3.3V position. Run Help Troubleshoot in PLLWizard if the problem is not resolved. DC1705A Reconfiguration You can redesign the frequency plan of the DC1705A using PLLWizard. You can change the loop filter components as found using PLLWizard by reinstalling the loop filter components shown in Figure 4. The red LED on DC1705A should turn on indicating that the loop is locked at 900MHz. Figure 4. DC1705A Components and Connections dc1705afa 5 DEMO MANUAL DC1705A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1705A General BOM 1 1 CI1 Capacitor, X7R 0.022F 50V 5% 0603 AVX 06035C223JAT2A 2 1 CI2 Capacitor, COG 6800pF 50V 5% 0805 Murata GRM2195C1H682JA01D 3 1 CP Capacitor, COG 2700pF 50V 5% 0603 Murata GRM1885C1H272JA01D 4 4 C1, C8, C9, C18 Capacitor, X7R, 1F, 16V, 10%, 0805 TDK, C2012X7R1C105K 5 2 C2, C10 Capacitor, Tantalum, 330F, 10V, 10%, 7343 AVX, TPME337K010R0035 6 2 C6, C11 Capacitor, X7R, 470pF, 50V, 10%, 0402 AVX, 04025C471KAT2A 7 4 C7, C12, C15, C19 Capacitor, X7R, 0.01F, 16V, 10%, 0402 AVX, 0402YC103KAT2A 8 C13, C14, C17, C22, C23, Capacitor, X5R, 0.1F, 10V, 10%, 0402 TDK, C1005X5R1A104K Capacitor, X7R, 2.2F, 16V, 10%, 0805 TDK, C2012X7R1C225K 8 C24, C25, C26 9 1 C16 10 2 C20, C21 Capacitor, NPO, 100pF, 50V, 5%, 0402 TDK, C1005C0G1H101J 11 1 D1 LED, Red Panasonic, LN1251CTR 12 4 E1, E2, E5, E8 Jack, Banana Keystone, 575-4 13 1 E3 Turret, Testpoint, 2501 Mill-Max, 2501-2-00-80-00-00-07-0 14 1 JP1 Headers, 3 Pins 2mm Ctrs. Samtec TMM-103-02-L-S 15 1 XJP1 Shunt, 2mm Ctrs. Samtec 2SN-BK-G 16 4 J1, J3, J4, J5 Connector, SMA 50 EDGE-LAUNCH E. F. Johnson, 142-0701-851 17 1 J2 Connector, Header, 14-Pin, 2mm Molex, 87831-1420 18 2 L1, L2 Inductor, Chip, 68nH, 5%, 0402 Coilcraft, 0402 HPH-68NXJL 19 1 RZ Resistor, Chip, 453 1/10W 1% 0603 NIC, NRC06F4530TRF 20 1 R1 Resistor, Chip, 51.1, 1/16W, 1% 0402 NIC, NRC04F51R1TRF 21 1 R3 Resistor, Chip, 330, 1/16W, 1% 0402 NIC, NRC04F3300TRF 22 1 R4 Resistor, Chip, 15, 1/16W, 1% 0402 NIC, NRC04F15R0TRF 23 4 R5, R6, R7, R13 Resistor, Chip, 200k, 1/16W, 1% 0402 NIC, NRC04F2003TRF 24 2 R8, R9 Resistor, Chip, 4.99k, 1/16W, 1% 0402 NIC, NRC04F4991TRF 25 3 R10, R11, R12 Resistor, Chip, 100 1/16W, 5%, 0402 NIC, NRC04J101TRF 26 2 U2, U3 IC, Dual Buffer SC-70 6-Lead Fairchild Semi. NC7WZ17P6X 27 1 U4 IC, Dual Transceiver SC-70 6-Lead NXP 74LVC1T45GW 28 4 4 Corners Standoff, Nylon, 0.5, 1/2" Keystone, 8833 (SNAP ON) DC1705A General BOM DC1705A IC Synthesizer QFN-28 4mm x 5mm Linear Technology Corporation, LTC6946IUFD-1 DC1705A General BOM DC1705A U1 IC Synthesizer QFN-28 4mm x 5mm Linear Technology Corporation, LTC6946IUFD-2 DC1705A General BOM DC1705A U1 IC Synthesizer QFN-28 4mm x 5mm Linear Technology Corporation, LTC6946IUFD-3 DC1705A-A 1 1 2 1 U1 DC1705A-B 1 1 2 1 DC1705A-C 1 1 2 1 dc1705afa 6 DEMO MANUAL DC1705A SCHEMATIC DIAGRAM dc1705afa 7 DEMO MANUAL DC1705A SCHEMATIC DIAGRAM Note: The buffers shown on sheet 2 of 2 of the schematic are used to protect the LTC6946 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 LTC6946. dc1705afa 8 DEMO MANUAL DC1705A LAYOUT The top metal layer of the DC1705A is shown here as an example of good PCB layout for the LTC6946. dc1705afa 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. 9 DEMO MANUAL DC1705A 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 (c) 2004, Linear Technology Corporation dc1705afa 10 Linear Technology Corporation LT 1211 REV A * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2011