ADA4940-1AR-EBZ

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 FEATURES 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, including 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. 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 Figure 1 shows the component side of the bare evaluation board, and Figure 2 shows the circuit side of the evaluation board. 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. 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. 11013-001 11013-002 EVALUATION BOARD COMPONENT AND CIRCUIT SIDE DIAGRAMS Figure 1. Evaluation Board, Component Side PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Figure 2. Evaluation Board, Circuit Side Rev. 0 | Page 1 of 8 UG-474 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 VOCM Input ......................................................................................4 General Description ......................................................................... 1 Common-Mode Voltage...............................................................4 Evaluation Board Component and Circuit Side Diagrams ......... 1 SMA Input/Output Connectors ..................................................4 Revision History ............................................................................... 2 Evaluation Board Silkscreens and Assembly Drawings ...............5 Evaluation Board Schematic ........................................................... 3 Ordering Information .......................................................................6 Evaluation Board Hardware ............................................................ 4 Bill of Materials ..............................................................................6 Power Supplies .............................................................................. 4 Related Links ......................................................................................6 Feedback Networks and Input/Output Terminations ............. 4 REVISION HISTORY 9/12—Revision 0: Initial Version Rev. 0 | Page 2 of 8 Evaluation Board User Guide UG-474 EVALUATION BOARD SCHEMATIC 11013-003 Figure 3. Differential Driver Evaluation Board Schematic, 8-Lead SOIC Rev. 0 | Page 3 of 8 UG-474 Evaluation Board User Guide EVALUATION BOARD HARDWARE POWER SUPPLIES VOCM INPUT 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. 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 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. 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 differential 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. Rev. 0 | Page 4 of 8 Evaluation Board User Guide UG-474 11013-004 11013-005 EVALUATION BOARD SILKSCREENS AND ASSEMBLY DRAWINGS Figure 5. Bottom Silkscreen 11013-006 11013-007 Figure 4. Top Silkscreen Figure 6. Component Side Assembly Drawing Figure 7. Circuit Side Assembly Drawing Rev. 0 | Page 5 of 8 UG-474 Evaluation Board User Guide ORDERING INFORMATION BILL OF MATERIALS Table 1. Qty 3 3 3 2 4 4 10 8 1 1 Reference Designator CVCC3, CVEE3, CD3 CVCC2, CVEE2, CD2 CVCC1, CVEE1, CD1 CPD, CVOM −IN, +IN, −OUT, +OUT VCC, VEE, VOCM, PD RTN, RTP, RGP, RGN, RFP, RFN, ROP1, RON1, ROP2, RON2 TVCC, TVEE, TVOCM, TPD, GND1 to GND4 DUT PCB Description Capacitor, 10 µF Capacitor, 0.1 µF Capacitor, 0.1 µF Capacitor/resistor Side launch SMA connector Vertical launch SMA connector Resistor, user-defined value Test point Device under test PC board RELATED LINKS Table 2. Resource ADA4940-1 AD8131 AD8132 AD8137 AD8138 AD8139 Description Product Page, Ultralow Power, Low Distortion Differential ADC Driver Product Page, Low Cost, High Speed Differential Driver with a Fixed Gain of 2 Product Page, Low Cost, High Speed Differential Amplifier Product Page, Low Cost, Low Power Differential ADC Driver Product Page, Low Distortion Differential ADC Driver Product Page, Ultralow Noise, Rail-to-Rail Differential ADC Driver Rev. 0 | Page 6 of 8 Package C1206 C0508 C0402 C0402 SMA/SMT SMA/SMT R0603 TP1 8-lead SOIC Evaluation Board User Guide UG-474 NOTES Rev. 0 | Page 7 of 8 UG-474 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. ©2012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG11013-0-9/12(0) Rev. 0 | Page 8 of 8