DEMO MANUAL DC1649A LTC6945 Ultralow Noise and Spurious Integer-N Synthesizer DESCRIPTION (R) Demonstration circuit 1649A features the LTC 6945, an ultralow noise and spurious integer-N synthesizer. DC1649A provides 50 SMA connectors for the reference frequency (REF+), the reference output buffer (REFO), and the two single-ended RF outputs (RF+ and RF-). Demonstration circuit 590 is used for SPI communication with the LTC6945, 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. DC1649A Inputs and Outputs dc1649afa 1 DEMO MANUAL DC1649A TYPICAL DC1649A REQUIREMENTS AND CHARACTERISTICS PARAMETER INPUT OR OUTPUT PHYSICAL LOCATION DETAILS 3.3V Power Supply Input J9 and J10 Banana Jacks Low Noise and Spur-Free 3.3V, 95mA 5V Charge Pump Power Supply Input J11 and J12 Banana Jacks Low Noise and Spur-Free 5V, 35mA 5V VCO Power Supply Input "V+VCO" Turret Low Noise and Spur-Free 5V, 18mA REF+, Reference Frequency Input J2 SMA Connector Low Noise 10MHz or 100MHz*, 6dBm into 50, See Note 1 REFO, Buffered Reference Output J1 SMA Connector Frequency = fREF, 0dBm RF+ and RF- Two Outputs J6 and J7 SMA Connectors 902MHz to 928MHz* in 250kHz* Steps, 0dBm Set by Loop Filter Component Values 7kHz* Loop Bandwidth *These frequencies are for the "DC1649A-10MHz.pllset "or" DC1649A-100MHz.pllset" files and included VCO. 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 250kHz. For example, if a 20MHz clock is used, Fref should be changed to 20MHz and R_DIV to 80. 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 LTC6945 data sheet. QUICK START PROCEDURE The DC590 and PLLWizard application are required to control the DC1649A through a personal computer (PC). DC590B Configuration The DC590's QuikEvalTM drivers must be installed before the DC590 will be able to communicate with the LTC6945. 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 DC1649A. 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. dc1649afa 2 DEMO MANUAL DC1649A QUICK START PROCEDURE Figure 2. DC590 Jumper and Connector Locations PLLWizard Installation The PLLWizard software is used to communicate with the LTC6945 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: n Windows Operating System: Windows XP, Windows 2003 Server, Windows Vista, Windows 7 n Microsoft .NET 2.0 or later n Windows Installer 3.1 or later n Linear Technology's QuikEval and DC590 hardware Microsoft .NET You must have Microsoft .NET 2.0 or later installed on your computer. PLLWizard will not run without it. Note that Windows Vista and Windows 7 have at least version 3.5 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 http://www.linear.com/software. 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. dc1649afa 3 DEMO MANUAL DC1649A QUICK START PROCEDURE Table 1. PLLWizard Installation File DC1649A Configuration FILE .NET 2.0 SOURCE PLLWizardSetup.exe latest version downloaded from Microsoft PLLWizardSetup_net20.exe 2.0 SP2 included (much larger file size) 1. Connect an appropriate reference frequency source (at J2) and signal analyzers (at J6 and/or J7) using the SMA connectors (see Figure 1 and the Typical DC1649A Requirements and Characteristics table). n 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. 2. Choose the MUTE jumper setting: JP1 - GND/3.3V MUTE position. Select GND to mute the RF output, 3.3V to un-mute. n 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). 3. Connect the GND, 3.3V, and 5V banana jacks and the "V+VCO" turret to a power supply and apply power (see Figure 1 and the Typical DC1649A Requirements and Characteristics table). The setup file will verify and/or install Microsoft .NET and install PLLWizard. Refer to the Help menu for software operation. 4. Connect the DC590 to the DC1649A with the provided ribbon cable. 5. Run the PLLWizard application. 6. In PLLWizard, click File Load Settings and point to the "DC1649A-10MHz.pllset" or "DC1649A-100MHz.pllset" file found in the PLLWizard installation directory (typically Program Files LTC PLLWizard Set Files). The red LED on DC1649A should turn on indicating that the loop is locked at 914MHz. Troubleshooting If the red LED does not illuminate, follow the instructions below: 1. Verify that you are able to communicate with the DC1649A. The bottom status line in PLLWizard should read "LTC6945" and "Comm Enabled". Refer to PLLWizard's Troubleshoot and Help if not. Figure 3. PLLWizard Screenshot 2. Verify that the 3.3V, 5V 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 JP1 is at the 3.3V position. Run Help Troubleshoot in PLLWizard if the problem is not resolved. dc1649afa 4 DEMO MANUAL DC1649A DC1649A RECONFIGURATION DC1649A 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 DC1649A. Refer to PLLWizard's Help and the LTC6945 data sheet to better understand how to change programmed parameters on the DC1649A. Installing Different Tunable Devices DC1649A permits the use of different tunable oscillators, like VCOs and VCXOs. There are two different oscillator footprints on the board: U3, which accommodates the popular 0.5in x 0.5in package, and U4, which accommodates another common 14mm x 9mm package with four or six pins. An external connectorized VCO can also drive the LTC6945 through J5. Table 2 gives options to customize the DC1649's VCOs. When using an active loop filter, an additional pole is required in the loop filter to limit the op amp's noise contribution to the VCO phase noise. Selecting Loop Filter Type DC1649A can use either an active or a passive loop filter, depending upon the application. Some VCO tuning voltage ranges are greater than the LTC6945 charge pump voltage range (refer to the LTC6945 data sheet). In such cases, an active loop filter using an op amp can deliver the required tuning voltage. Table 3 summarizes these options. PLLWizard helps determine the component values listed in this table. Table 2. Oscillator Options TUNABLE DEVICE SELECTION COMPONENTS RESISTOR FOR ADDITIONAL POLE CAPACITOR FOR ADDITIONAL POLE U3 C26 100pF, depopulate R17, C25 and C28 R10 = 0 for passive loop filter C27 = Open for passive loop filter U4 C28 100pF, depopulate R10, C25 and C26 R10 100 for active loop filter Determined by U3 device power supply specification, up to 24V Pick C27 such that 1/(2 * R10 * C27) 15 * applied to "V+VCO" turret the loop bandwidth in Hz for active loop filter R17 = 0 for passive loop filter C32 = Open for passive loop filter R17 100 for active loop filter External POWER Determined by U4 device power supply specification, up to 24V Pick C32 such that 1/(2 * R17 * C32) 15 * applied to "V+VCXO" the loop bandwidth in Hz turret for active loop filter ENABLE PIN OR REMARKS Use "EN" turret to control pin 2 of U4 Selection components are for an active loop filter. Connect the external VCO output to J5. Use "CPGAIN" to tune the external device C25 100pF, R15 = 0, depopulate R13, C26 and C28 Table 3. 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 R14 and R16 = 0, depopulate R13 and R15 RZ_P CI1_P in parallel with CI2_P CP_P None Unchecked Active RZ_A R13 (except when using an external VCO) and R15 = 0, depopulate R14 and R16 CI1_A in parallel with CI2_A CP_A Determined by the maximum allowed tune voltage of the populated VCO (U3 or U4), up to 24V applied to "V+OA" turret Checked dc1649afa 5 DEMO MANUAL DC1649A PARTS LIST ITEM 1 2 3 4 5 6 7 8 QTY 0 0 1 1 3 4 2 10 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 4 1 2 3 0 5 1 10 1 1 5 0 1 4 0 2 1 5 1 1 4 4 3 0 0 1 1 1 0 2 1 1 4 2 Number of Boards = 325 REFERENCE CI1_P, CI1_A, C27, C32, CP_A CI2_A CI2_P CP_P C1, C19, C33 C2, C6, C21, C35 C3, C16 C4, C11, C17, C24, C30, C36, C39, C41, C43, C44 C5, C12, C18, C31 C7 C8, C15 C23, C34, C45 C25, C28 C26, C29, C37, C38, C42 D1 E3, E6, E11-E18 JP1 XJP1 J1, J2, J5, J6, J7 J3, J4 J8 J9, J10, J11, J12 L1 L2, L3 RZ_P R1, R2, R25, R26, R27 R4 R5 R7, R8, R18, R19 R9, R10, R14, R16 R12, R21, R22 R13, R15, R17, RZ_A R23, R24 U1 U2 U3 (1 Reel + 1 Tape, PbF) U4 U5, U6 U7 U8 4 Corners PART DESCRIPTION Opt., 0603 Opt., 1206 Cap., C0G, 0.1F, 50V, 5%, 1206 Cap., X7R, 8200pF, 50V, 10%, 0603 Cap., Tantalum, 47F, 35V, 10%, 7361 Cap., X7R, 0.1F, 50V, 10%, 0805 Cap., Tantalum, 330F, 10V, 10%,7343 Cap., X5R, 0.1F, 10V, 10%, 0402 MANUFACTURER/PART NUMBER Cap., X5R, 1F, 10V, 10%, 0402 Cap., Tantalum, 47F, 20V, 10%, 7343 Cap., X7R, 470pF, 50V, 10%, 0402 Cap., X7R, 0.01F, 16V, 10%, 0402 Opt., 0402 Cap., NPO, 100pF, 16V, 10%, 0402 LED, RED Turret, Testpoint, 2501 Headers, 3 Pins, 2mm Ctrs. Shunt, 2mm Ctrs. Con., SMA 50 Edge-Launch Con., SMA 50 Straight Mount Con., Header, 14 Pin, 2mm Jack, Banana Opt., 0402 Ind., Wirebound, 68nH, 5%, 0402 Res., Chip, 806, 1/10W, 1%, 0603 Res., Chip, 4.99k, 1/16W, 1%, 0402 Res., Chip, 330, 1/16W, 1%, 0402 Res., Chip, 51.1, 1/16W, 1%, 0402 Res., Chip, 200k, 1/16W, 1%, 0402 Res., Chip, 0, 0603 Res., Chip, 100, 1/16W, 1%, 0402 Opt., 0603 Res., Chip, 0402, Opt. I.C. LTC6945IUFD, QFN28UFD Low Noise Amp, S0-8 Voltage Controlled Oscillator - VC0 Crystal Oscillator, Opt. I.C., Dual Buffer, SC-70 6-Lead I.C., Dual Transceiver, SC-70 6-Lead I.C., Serial EEPROM, TSSOP-8 Standoff, Nylon, 0.50, 1/2" Stencils (Top and Bottom) AVX, 0402ZD105KAT2A AVX, TAJD476K020RNJ AVX, 04025C471KAT2A AVX, 0402YC103KAT2A Murata, GRM31C5C1H104JA01L Murata, GRM188R71H822KA01D AVX, TAJV476K035RNJ AVX, 08055C104KAT2A AVX, TPME337K010R0035 AVX, 0402ZD104KAT2A AVX, 0402YA101KAT2A Panasonic, LN1251CTR Mill-Max, 2501-2-00-80-00-00-07-0 Samtec, TMM-103-02-L-S Samtec, 2SN-BK-G E. F. Johnson, 142-0701-851 Opt. Molex, 87831-1420 Keystone, 575-4 Coilcraft, 0402HPH-68NXJL Vishay, CRCW0603806RFKEA Vishay, CRCW04024K99FKED Vishay, CRCW0402330RFKED Vishay, CRCW040251R1FKED Vishay, CRCW0402200KFKED Vishay, CRCW06030000Z0EA Vishay, CRCW0402100RFKED Linear Technology Corp., LTC6945IUFD Linear Technology Corp., LT1678CS8#PBF Crystek, CVCO55CL-0902-0928 Fairchild Semi., NC7WZ17P6X NXP, 74LVC1T45GW Mircochip, 24LC24A-I/ST Keystone, 8833 (Snap On) Stencil, DC1649A-4 dc1649afa 6 D C B A JP1 1 D1 LN1251C C3 330uF 10V 7343 CVCO55CL-0902-0928 U3 3.3V R4 330 + 3.3V VCO C30 0.1uF C4 0.1uF 1 2 1. ALL RESISTORS ARE IN OHMS, 0402 ALL CAPACITORS ARE IN MICROFARADS, 0402. 470pF J7 L2 68nH RF- V+D SDO SDI SCLK CS STAT REFO C8 470pF R5 51.1 V+REFO 3.3V 8 7 6 5 4 3 2 C15 C24 0.1uF 1 3.3V 3.3V 902 - 928 MHz 2 C11 0.1uF C5 1.0uF NOTE: UNLESS OTHERWISE SPECIFIED -A SCLK SDI SDO CS E6 J1 J2 J10 J9 J3 MUTE ASSY * GND 3.3V STATUS REF0 REF+ GND 3.3V CP OPT E3 27 CP 3 25 3 C37 100pF C17 0.1uF R16 0 0603 R15 OPT 0603 23 2 28 REF9 MUTE 10 REF+ GNDA 26 V+REF RF- 11 CP RF+ 12 22 J6 RF+ C42 100pF C26 100pF 3.3V 4 C45 0.01uF CI2_A CI1_A 9 10 GND RFOUT GND GND 8 * OPT 1206 0603 OPT GND GND VTUNE GND 5 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. C27 OPT 0603 R10 0 0603 6 SCALE = NONE MICHEL A. KIM T. APPROVALS 4 3 2 1 0603 0 R14 0603 OPT C1 7361 + 47uF 35V GND EN VTUNE VCC NC 5 4 0.1uF 47uF 35V R24 J5 E18 E17 E16 E15 E14 E13 J4 E12 J12 J11 EXT VCO IN EN GND GND V+VCXO GND V+VCO OPT CPGAIN CPGAIN GND 5V DATE 11-01-11 DATE: N/A SIZE LTC6945IUFD DEMO CIRCUIT 1649A 7 11/01/2011, 02:18 PM IC NO. 8 SHEET 1 OF 2 4 REV. ULTRALOW NOISE AND SPURIOUS INTEGER-N SYNTHESIZER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only OPT R23 OPT TECHNOLOGY RFOUT 6 C35 0805 C33 7361 V+VCXO V+VCO 5V V+OA MICHEL A. E11 APPROVED DESCRIPTION 8 PRODUCTION REVISION HISTORY 4 TITLE: SCHEMATIC 3 2 1 7 REV U4 OPT ECO __ C32 OPT 0603 R17 OPT 0603 C2 0.1uF 0805 V+OA 6 R13 V+ 7 OUTB 6 -INB B 5 +INB 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 APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. CUSTOMER NOTICE L1 OPT C25 OPT C28 OPT V- C19 V+VCO 47uF 35V 7361 C21 0.1uF U3 0805 1206 11 C29 100pF LTC6945IUFD U1 OPT RZ_P 806 0603 0603 RZ_A OPT 0603 CI2_P 0.1uF CI1_P 4 2 OUTA -INA A 3 +INA 1 U2 LT1678IS8 CP_A OPT 0603 C12 1.0uF 12 0.01uF C38 100pF C16 330uF CP_P 10V 8200pF 7343 0603 R1 4.99K 5 16 C31 1.0uF L3 68nH + C7 47uF 7343 20V C6 0.1uF 0805 R2 4.99K 5V 15 17 18 19 20 21 4 3.3V C23 0.01uF C18 1.0uF 0805 5V 3.3V C34 VCO- VCO+ GNDB GNDC GNDD GNDE GNDF V+VCO GND 24 V+CP V+RF 13 14 29 GNDG BB 14 13 8 GND GND 15 GND GND 7 VCC GND 16 GND GND 6 + + 5 + 1 D C B A DEMO MANUAL DC1649A SCHEMATIC DIAGRAM dc1649afa 7 1 2 3 4 A 1 V+ 2 5V 6 CS 4 SCK/SCL 7 MOSI/SDA 5 MISO 10 EEVCC 9 EESDA 11 EESCL 12 EEGND 14 AUX J8 HD2X7-079-MOLEX WP R25 4.99K 6 5 7 3 2 1 SCL SDA WP A2 A1 A0 U8 24LC025-I /ST R26 4.99K R9 0 0603 C43 0.1uF C B C THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. C36 0.1uF R7 200K R19 200K SCALE = NONE MICHEL A. KIM T. APPROVALS 3.3V 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 APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. CUSTOMER NOTICE NOTE: EEPROM FOR BOARD IDENTIFICATION EEGND R27 4.99K V+DIG CS SCLK SDI SDO ARRAY GND GND GND 13 8 3 B EEPROM 8 VCC 8 GND Note: The buffers shown on sheet 2 of 2 of the schematic are used to protect the LTC6945 when communicating to it starts before powering it up. There is no need for such circuitry if the SPI bus is not active before 4 A 3 2 1 VCC DIR VCC(B) 5 4 5 6 3.3V E SDO SDI SCLK CS DATE: N/A SIZE LTC6945IUFD DEMO CIRCUIT 1649A D 11/01/2011, 02:27 PM IC NO. E SHEET 2 OF 2 4 REV. ULTRALOW NOISE AND SPURIOUS INTEGER-N SYNTHESIZER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only R18 200K C39 0.1uF C44 0.1uF R12 100 0.1uF R22 100 R21 100 C41 3.3V 3.3V TECHNOLOGY GND VCC(A) U7 74LVC1T45GW GND 4 3 2 6 1 TITLE: SCHEMATIC R8 200K 5 2 U6 NC7WZ17P6X 4 3 VCC 6 1 GND U5 NC7WZ17P6X DC590B SPI INTERFACE D 1 2 3 4 DEMO MANUAL DC1649A SCHEMATIC DIAGRAM powering up the LTC6945. The EEPROM is for identification and is not needed to program the LTC6945. dc1649afa DEMO MANUAL DC1649A LAYOUT TOP LAYER The top metal layer of DC1649A is shown here as an example of good PCB layout for the LTC6945. dc1649afa 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 DC1649A 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 dc1649afa 10 Linear Technology Corporation LT 0112 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