Evaluation Board User Guide UG-069
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Evaluation Board User Guide UG-069 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 ADCLK946 PACKAGE LIST The data sheet contains full technical details about the specifications and operation of this device. Evaluation board with ADCLK946 component installed Applicable documents (schematic, layout) GENERAL DESCRIPTION This user guide describes how to set up and use the evaluation board for the ADCLK946. The ADCLK946 data sheet should be used in conjunction with this user guide. The ADCLK946 is a very high performance clock fanout buffer. The evaluation board is fabricated using a high quality Rogers dielectric material. Transmission line paths are kept as close to 50 Ω as possible. 08668-101 DIGITAL PICTURE OF EVALUATION BOARD Figure 1. ADCLK946 Evaluation Board Please see the last page for an important warning and disclaimers. Rev. 0 | Page 1 of 8 UG-069 Evaluation Board User Guide TABLE OF CONTENTS Package List ....................................................................................... 1 Recommended Board Setup ........................................................3 General Description ......................................................................... 1 Clock Outputs ................................................................................4 Digital Picture of Evaluation Board ............................................... 1 Evaluation Board Schematic and Artwork.....................................5 Revision History ............................................................................... 2 ESD Caution...................................................................................8 Evaluation Board Hardware ............................................................ 3 REVISION HISTORY 11/09—Revision 0: Initial Version Rev. 0 | Page 2 of 8 Evaluation Board User Guide UG-069 EVALUATION BOARD HARDWARE RECOMMENDED BOARD SETUP Table 1. Basic Equipment Required The recommended setup for the ADCLK946 evaluation board is shown in Figure 2. VCC is set 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 ADCLK946. 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 ADCLK946 data sheet. POWER SUPPLY +3.3V GND VCC VEE CH 1 CLK CLK ADCLK946 Qx EVALUATION BOARD OSCILLOSCOPE Qx VREF CH 2 VT Figure 2. Recommended Setup for Device Evaluation Rev. 0 | Page 3 of 8 08668-002 CLOCK SOURCE GND UG-069 Evaluation Board User Guide CLOCK OUTPUTS The ADCLK946 has six 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. ADCLK946 Table 2. Power Connections via P1 Label GND VCC VEE ADCLK946 Connect to GND Connect to 3.3 V Connect to GND LVPECL Q0 Q0 VREF REFERENCE Q1 Q1 VT Q2 CLK Q2 CLK Q3 Q3 Q4 Q4 08668-001 Q5 Q5 Figure 3. ADCLK946 1:6 Clock/Data Buffer Block Diagram Rev. 0 | Page 4 of 8 GND GND CLK J15 CLKB J14 0 GND R07 R09 DNI 0 4 3 MABA-007159-000000 SEC T2 PRI 0 1 DNI 5 R08 GND GND J10 OUT5 GND J11 OUT5B GND GND C2 2 .1UF .1UF CLKB .1UF C4 .1UF C3 C04 C03 CLK .1UF 1 50 OHMS 50 OHMS 50 OHMS 50 OHMS 50 OHMS VEE CLK CLKB VREF VT VEE OUT5 OUT5B 1 2 3 VREF 4 5 VT VEE 6 VEE OUT0 VEE R4 VEE R5 200 VCC VEE 200 .1UF Q5B Q4B VEE Q5 Q4VEE ADCLK946 CP-24-2 VCC Q0 Q1 VEE Q0B Q1B VEE VEE VEE VCC Q2 Q2B Q3 Q3B VCC VEE VEE VEE VEE VEE 18 VCC 17 16 15 14 13 VCC OUT4B OUT4 50 OHMS 200 R14 VEE OUT1B OUT1 VEE R15 OUT0 49.9 J0 R11 R10 R12 C9 VEE 50 OHMS 50 OHMS VEE OUT2B OUT2 .1UF C12 .1UF C11 50 OHMS 50 OHMS 50 OHMS 50 OHMS .1UF C10 .1UF J2 .1UF C16 1 2 .1UF C15 J8 .1UF C18 GND GND OUT2B GND OUT2 GND OUT3B GND OUT3 J5 J4 J7 J6 LABEL "VCC (3.3V)" LABEL "VEE (GND)" .1UF C17 OUT4B J9 GND OUT4 OUT3B OUT3 GND OUT1B J3 GND OUT1 POWER P1 ORDER WEILAND 25.600.5453.0 PLUG SAME AS ADCLK954 ENGR BRD TP1 VT VREF 1 VT VEE VCC GND VEE BYPASS CAPACITORS (SUPPLY) GND VCC BYPASS CAPACITORS (DUT) VEE STITCHING RESISTORS (O OHM) GND C31 C32 GND DNI VCC GND R13 100 49.9 1 2 3 4 VEE 0 .1UF 10UF 50 OHMS GND VEE BYPASS CAPACITORS VT VREF R46 OUT0B PAD VEE R1 R47 200 200 R44 R3 R2 Z5.531.3425.0 C34 C33 R9 200 R17 0 .1UF 10UF 200 200 200 R45 50 OHMS C36 200 R16 C35 C5 0 .1UF C41 R43 0 C39 C1 2 R48 1 .1UF C6 J1 OUT0B .1UF 24 23 22 21 20 19 7 8 9 10 11 12 R8 R6 Figure 4. ADCLK946 Evaluation Board Schematic 200 Rev. 0 | Page 5 of 8 200 0 .1UF C37 10UF 0 .1UF 0 .1UF C40 50 OHMS => SINGLE ENDED Evaluation Board User Guide UG-069 EVALUATION BOARD SCHEMATIC AND ARTWORK 08668-004 .1UF Evaluation Board User Guide 08668-005 UG-069 08668-006 Figure 5. Top Trace Layer Figure 6. Ground Plane Layer Rev. 0 | Page 6 of 8 UG-069 08668-007 Evaluation Board User Guide 08668-008 Figure 7. VCC and VEE Power Plane Layer Figure 8. Bottom Trace Layer Rev. 0 | Page 7 of 8 UG-069 Evaluation Board User Guide NOTES ESD CAUTION Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards. 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. Analog Devices reserves the right to change devices or specifications at any time without notice. Trademarks and registered trademarks are the property of their respective owners. Evaluation boards are not authorized to be used in life support devices or systems. ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG08668-0-11/09(0) Rev. 0 | Page 8 of 8
