Evaluation Board User Guide UG-125 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com Setting Up the Evaluation Board for the ADCLK944 PACKAGE CONTENTS The data sheet contains full technical details about the specifications and operation of this device. Evaluation board with ADCLK944 component installed GENERAL DESCRIPTION This user guide describes how to set up and use the evaluation board for the ADCLK944. The ADCLK944 data sheet should be used in conjunction with this user guide. The ADCLK944 is a very high performance clock fanout buffer. The evaluation board is fabricated using high quality Rogers dielectric material. Transmission line paths are kept as close to 50 Ω as possible. 08976-101 DIGITAL PICTURE OF EVALUATION BOARD Figure 1. ADCLK944 Evaluation Board PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 8 UG-125 Evaluation Board User Guide TABLE OF CONTENTS Package Contents .............................................................................. 1 Evaluation Board Hardware .............................................................3 General Description ......................................................................... 1 Recommended Board Setup ........................................................3 Digital Picture of Evaluation Board ............................................... 1 Clock Outputs ................................................................................4 Revision History ............................................................................... 2 Evaluation Board Schematic and Artwork.....................................5 REVISION HISTORY 4/10—Revision 0: Initial Version Rev. 0 | Page 2 of 8 Evaluation Board User Guide UG-125 EVALUATION BOARD HARDWARE RECOMMENDED BOARD SETUP Table 1. Basic Equipment Required The recommended setup for the ADCLK944 evaluation board is shown in Figure 2. VCC is set to 2.5 V to 3.3 V, and VEE is set to GND. Quantity 1 1 1 4 On the evaluation board, the clock input is set up for singleended-to-differential operation via the balun. In addition, series capacitors in the path provide ac-coupled inputs to the ADCLK944. The common-mode voltage for both inputs is provided by tying VREF and VT together. This connection is made with R13 installed at the factory. Description Single power supply Signal source High bandwidth oscilloscope Matched high speed cables The range of the peak-to-peak input voltage swing at CLK is 0.2 V p-p to 1.7 V p-p. Note that output jitter performance is degraded by an input slew rate, as shown in the ADCLK944 data sheet. POWER SUPPLY +3.3V GND VCC VEE CH 1 CLK CLK ADCLK944 Qx EVALUATION BOARD OSCILLOSCOPE Qx VREF CH 2 VT Figure 2. Recommended Setup for Device Evaluation Rev. 0 | Page 3 of 8 08976-002 CLOCK SOURCE GND UG-125 Evaluation Board User Guide CLOCK OUTPUTS Table 2. Power Connections via P1 The ADCLK944 has four differential outputs. All differential clock outputs on the evaluation board are biased to GND via 200 Ω and ac-coupled to the SMAs. From the SMAs, use matched 50 Ω coaxial cables into the oscilloscope for evaluation. See the evaluation board schematic in Figure 4 for more details. Label GND VCC VEE ADCLK944 ADCLK944 Connect to GND Connect to 3.3 V Connect to GND LVPECL Q0 VREF Q0 REFERENCE Q1 Q1 VT Q2 CLK Q2 CLK Q3 08976-001 Q3 Figure 3. ADCLK944 1:4 Clock/Data Buffer Block Diagram Rev. 0 | Page 4 of 8 1 1 1 GND 2 3 4 J4 CLKB GND 2 3 4 J3 CLK GND 2 3 4 J2 OUTPUT 0 GND 2 3 4 1 GND 142-0761-861 CLKB 142-0761-861 CLK 142-0761-861 OUT0 142-0761-861 OUT0B R1 0 Rev. 0 | Page 5 of 8 0 DNI R3 MABA-007159-000000 3 SEC PRI 4 1 5 T1 0 DNI R2 GND R5 49.9 DNI R4 49.9 DNI GND R6 100 DNI 0 DNI R8 0.1µF C4 0.1µF C3 0 DNI R7 0 R11 0.1µF C2 0.1µF C1 VT VREF VEE LABEL PIN 1 VEE R10 200 VEE R9 200 PAD 16 15 14 13 1 2 CLK V 3 T V 4 REF CLK VEE VCC ADCLK944 Q1 12 11 Q1 10 Q2 9 Q2 U1 VCC EPAD VEE Q0 Q0 VCC 5 VEE 6 Q3 7 Q3 8 VCC J1 OUTPUT 0B Figure 4. ADCLK944 Evaluation Board Schematic VEE R17 200 VEE R16 200 VEE R15 200 VEE R14 200 VEE R13 200 VEE R12 200 OUT1 OUT1B OUT2 OUT2B OUT3 OUT3B 0.1µF 142-0761-861 C10 0.1µF 142-0761-861 C9 0.1µF 142-0761-861 C8 0.1µF 142-0761-861 C7 0.1µF 142-0761-861 C6 0.1µF 142-0761-861 C5 J5 OUTPUT 1 J6 OUTPUT 1B J7 OUTPUT 2 J8 OUTPUT 2B J9 OUTPUT 3 J10 OUTPUT 3B GND 4 3 2 1 GND 4 3 2 1 GND 4 3 2 1 GND 4 3 2 1 GND 4 3 2 1 GND 4 3 2 1 GND VCC VEE GND Z5.531.3425.0 1 2 3 4 R19 0 R20 0 R21 0 VT TP1 WHT C20 0.1µF VCC VEE VEE VCC C17 10µF C16 10µF C14 0.1µF VT C13 0.1µF VT C19 0.1µF VREF C18 0.1µF VREF BYPASS CAPACITORS C12 10µF BYPASS CAPACITORS (SUPPLY) 1 C15 0.1µF BYPASS CAPACITORS (DUT) C11 0.1µF R18 0 GND R22 0 STITCHING RESISTORS (0 OHM) VEE VCC POWER P1 C21 0.1µF VEE R23 0 Evaluation Board User Guide UG-125 EVALUATION BOARD SCHEMATIC AND ARTWORK 08976-004 Evaluation Board User Guide 08976-005 UG-125 08976-006 Figure 5. Top Trace Layer Figure 6. Ground Plane Layer Rev. 0 | Page 6 of 8 UG-125 08976-007 Evaluation Board User Guide 08976-008 Figure 7. VCC and VEE Power Plane Layer Figure 8. Bottom Trace Layer Rev. 0 | Page 7 of 8 UG-125 Evaluation Board User Guide NOTES 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. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed. ©2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG08976-0-4/10(0) Rev. 0 | Page 8 of 8