Evaluation Board User Guide
UG-125
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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.
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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
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Evaluation Board User Guide
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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
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CLOCK
SOURCE
GND
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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
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EVALUATION BOARD SCHEMATIC AND ARTWORK
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Evaluation Board User Guide
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08976-006
Figure 5. Top Trace Layer
Figure 6. Ground Plane Layer
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Evaluation Board User Guide
08976-008
Figure 7. VCC and VEE Power Plane Layer
Figure 8. Bottom Trace Layer
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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.
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