Evaluation Board User Guide
UG-474
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
Evaluation Board for Differential Amplifiers
Offered in 8-Lead SOIC Packages
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 8
FEATURES
Flexible board layout allows for various circuit
configurations
Accommodates the ADA4940-1 and the AD813x family
of differential amplifiers in 8-lead SOIC packages
Enables quick breadboarding/prototyping
Edge-mounted SMA connector provisions
Easy connection to test equipment and other circuits
RoHS compliant
GENERAL DESCRIPTION
The Analog Devices, Inc., 8-lead SOIC evaluation board for
differential drivers is designed to help users evaluate differential
drivers offered in 8-lead standard small outline (SOIC) packages.
The 8-lead SOIC differential driver evaluation board makes it
easy for designers to obtain quick performance results for their
specific differential driver application circuits.
The 8-lead SOIC evaluation board is a bare board (that is, no
components are soldered to the board) that enables users to
quickly prototype a variety of differential driver circuits, thereby
minimizing risk and reducing time to market. The board layout
is very flexible and allows for many circuit configurations, includ-
ing traditional four-resistor circuits, circuits with two different
feedback loops, filters, and many others. Most resistors and
capacitors use 1206, 0402, 0508, and 0603 packages.
Figure 1 shows the component side of the bare evaluation board,
and Figure 2 shows the circuit side of the evaluation board.
Because this universal evaluation board can be used with many
Analog Devices differential amplifiers in 8-lead SOIC packages,
the evaluation board label does not contain specific part numbers.
The board accommodates the ADA4940-1, as well as many
members of the AD813x family of differential amplifiers (see the
Related Links section). The data sheets for these devices should
be consulted in conjunction with this evaluation board user guide.
EVALUATION BOARD COMPONENT AND CIRCUIT SIDE DIAGRAMS
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11013-002
Figure 1. Evaluation Board, Component Side Figure 2. Evaluation Board, Circuit Side
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TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Evaluation Board Component and Circuit Side Diagrams ......... 1
Revision History ............................................................................... 2
Evaluation Board Schematic ........................................................... 3
Evaluation Board Hardware ............................................................ 4
Power Supplies .............................................................................. 4
Feedback Networks and Input/Output Terminations ............. 4
VOCM Input ......................................................................................4
Common-Mode Voltage ...............................................................4
SMA Input/Output Connectors ..................................................4
Evaluation Board Silkscreens and Assembly Drawings ...............5
Ordering Information .......................................................................6
Bill of Materials ..............................................................................6
Related Links ......................................................................................6
REVISION HISTORY
9/12—Revision 0: Initial Version
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Rev. 0 | Page 3 of 8
EVALUATION BOARD SCHEMATIC
11013-003
Figure 3. Differential Driver Evaluation Board Schematic, 8-Lead SOIC
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EVALUATION BOARD HARDWARE
POWER SUPPLIES
Power is applied to the evaluation board through the TVCC
and TVEE test points (see Figure 3). The board accommodates
single or dual supplies. For single-supply operation, connect the
negative supply to the ground plane.
It is very important that the power supply pins of the device
under test (DUT) have broadband decoupling circuitry. The
board layout facilitates this with footprints for 0508 ceramic
capacitors (CVCC2 and CVEE2) on each supply, as well as 0402
ceramic capacitors (CVCC1 and CVEE1). Bulk decoupling is
provided by CVCC3 and CVEE3; 10 µF tantalum capacitors
are recommended.
FEEDBACK NETWORKS AND INPUT/OUTPUT
TERMINATIONS
Resistors RGN and RFN comprise the negative resistive feedback
loop, and Resistors RGP and RFP comprise the positive feedback
loop (see Figure 3). To minimize summing node capacitances,
the ground plane under and around Pin 1 and Pin 8 of the DUT
and the copper that connects to them have been removed.
Resistors RTN and RTP are included as input termination resistors
for applications that have single-ended inputs.
VOCM INPUT
An external voltage can be applied to the VOCM pin via the
TVOCM test point (referenced to the ground plane of the board).
In ADC driver applications, it is convenient to apply the ADC dc
reference voltage output directly. The CVOM component position
can be used for both resistors and capacitors. A 0.1 μF capacitor
is used in normal applications to provide bypassing for the dc
voltage applied to the VOCM pin.
It is also possible to drive the VOCM input from an external ac
source. In this case, omit CVOM, or reduce it to a value that
allows the desired signal to be passed.
COMMON-MODE VOLTAGE
The internal common-mode feedback loop used in the differen-
tial drivers forces the output common-mode voltage to be equal
to the voltage applied to the VOCM input, thereby providing
excellent output balance.
SMA INPUT/OUTPUT CONNECTORS
The inputs and outputs have edge-mounted SMA connectors
for convenient connection to coaxial cables. The recommended
connector is Part No. 142-0701-801 from Johnson Components,
or equivalent.
Evaluation Board User Guide UG-474
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EVALUATION BOARD SILKSCREENS AND ASSEMBLY DRAWINGS
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11013-005
Figure 4. Top Silkscreen Figure 5. Bottom Silkscreen
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11013-007
Figure 6. Component Side Assembly Drawing Figure 7. Circuit Side Assembly Drawing
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ORDERING INFORMATION
BILL OF MATERIALS
Table 1.
Qty Reference Designator Description Package
3 CVCC3, CVEE3, CD3 Capacitor, 10 µF C1206
3 CVCC2, CVEE2, CD2 Capacitor, 0.1 µF C0508
3 CVCC1, CVEE1, CD1 Capacitor, 0.1 µF C0402
2 CPD, CVOM Capacitor/resistor C0402
4 −IN, +IN, −OUT, +OUT Side launch SMA connector SMA/SMT
4 VCC, VEE, VOCM, PD Vertical launch SMA connector SMA/SMT
10 RTN, RTP, RGP, RGN, RFP, RFN, ROP1, RON1, ROP2, RON2 Resistor, user-defined value R0603
8 TVCC, TVEE, TVOCM, TPD, GND1 to GND4 Test point TP1
1 DUT Device under test 8-lead SOIC
1
PCB
PC board
RELATED LINKS
Table 2.
Resource Description
ADA4940-1 Product Page, Ultralow Power, Low Distortion Differential ADC Driver
AD8131 Product Page, Low Cost, High Speed Differential Driver with a Fixed Gain of 2
AD8132 Product Page, Low Cost, High Speed Differential Amplifier
AD8137 Product Page, Low Cost, Low Power Differential ADC Driver
AD8138 Product Page, Low Distortion Differential ADC Driver
AD8139 Product Page, Ultralow Noise, Rail-to-Rail Differential ADC Driver
Evaluation Board User Guide UG-474
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NOTES
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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. TERMINATI ON. 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.
©2012 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG11013-0-9/12(0)
