ANALOG DEVICES UG-133 Evaluation Board User Guide

ANALOG DEVICES UG-133 Evaluation Board

Product Information

header. Pin 1 is for the positive supply, Pin 3 is for the negative
supply, and Pin 2 is connected to the ground plane of the board.
Alternatively, looped test points can be used: TP6 connects to the
positive supply, TP7 connects to the negative supply, and TP8, TP9,
TP10, and TP11 connect to the ground plane.
Feedback Networks and Input/Output Terminations| The boards include resistive feedback loops (R5 and R6) that
can be returned to ground through R8 or to the reference voltage
circuitry (VR1 and C7). Capacitors C5 and C6 are included across
the feedback resistor and gain resistor, respectively, for
frequency response shaping. The reference voltage can be adjusted
using Potentiometer VR1. A source termination resistor (R7) is
included on the output to facilitate driving coaxial cables and
test equipment.
Input/Output Connectors| The boards have edge-mounted Subminiature A (SMA) connectors
for easy connection to coaxial cables. Straight or right-angle
through-hole SMA connectors can be used for inputs.
Power-Down| The power-down feature of the device can be asserted using
Pull-up Resistor R4 and Jumper JU2.

INTRODUCTION

The Analog Devices, Inc., differential receiver evaluation boards (for the MSOP and SOIC) make it easy for designers to quickly assess the performance of a particular differential receiver application circuit. The evaluation board is a bare board (that is, there are no components soldered to the board) that is very flexible and allows for several feedback configurations, commonmode and differential input terminations, reference voltage applications, and other circuit features. Most resistors and capacitors on the board are in 1206 packages.

DEVICES COVERED
The boards are used for the AD8129 and AD8130.

POWER SUPPLIES

Power is applied to the boards through J1, a Molex 0022112032 3-pin header. Pin 1 (square footprint) is for the positive supply, Pin 3 is for the negative supply, and Pin 2 is connected to the ground plane of the board. Alternatively, looped test points can be used: TP6 connects to the positive supply, TP7 connects to the negative supply, and TP8, TP9, TP10, and TP11 connect to the ground plane (see Figure 1). The board can accommodate single and 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 decoupling circuitry. The board layout facilitates such decoupling by including footprints for a 1206 ceramic capacitor on each supply. For broadband decoupling, it is recommended that two ceramic capacitors be used: one for lower frequencies and one for higher frequencies. To use two capacitors on each supply, stack two 1206 ceramic capacitors on the same footprint. Bulk decoupling is provided by C1 and C3; 10 μF tantalum capacitors are recommended.

FEEDBACK NETWORKS AND INPUT/OUTPUT TERMINATIONS

A reference voltage can be injected at Pin 4 of the DUT. Using Potentiometer VR1, which spans the power supplies, the designer can adjust the reference voltage over a wide range. C7 provides bypassing on the wiper of VR1. A test point, TP5, is provided for monitoring the reference voltage. When VR1 is used, it is important to ensure that JU3 is shorted. To minimize parasitic summing node capacitance, the ground plane has been voided under and around Pin 5 of the DUT and the copper that connects to it. Differential termination is provided by R3, and common-mode terminations are provided by R1 and R2. C9 and C10 allow optional input ac coupling and must be shorted across when not used. JU1 provides the means to directly monitor the differential input by using a suitable high impedance differential probe, or to directly short across the differential inputs for test purposes. Standard 0.100-inch pitch headers can be used in JU1. Alternatively, TP2 and TP3, which accommodate looped-type test points, can be used. A source termination resistor, R7, is included on the output to facilitate driving coaxial cables and test equipment. The output signal can be monitored before the source termination resistor at TP4. Because TP4 is the direct amplifier output, any test equipment connected to TP4 adds to the capacitive load of the amplifier, thus diminishing the phase margin. Extreme care should be exercised when connecting test equipment to TP4.

INPUT/OUTPUT CONNECTORS

The inputs and outputs have edge-mounted Subminiature A (SMA) connectors for straightforward connection to coaxial cables. Johnson Components Part Number 142-0701-801, or the equivalent, is recommended. On the inputs, TP13 and TP14 provide the option of using straight or right-angle through-hole SMA connectors.

POWER-DOWN
Pull-up Resistor R4 and Jumper JU2 make it easy for the power-down feature of the DUT to be asserted. The recommended value for R4 is 1 kΩ. As with JU1, a 0.100-inch pitch header can be used for JU2.

OTHER COMPONENTS
There may be application circuits where footprints for desired components are not available on the board. In these cases, the user is encouraged to use his or her ingenuity to find ways to include them.

EVALUATION BOARD SCHEMATIC AND ARTWORK

SOIC EVALUATION BOARDS (R)

MSOP EVALUATION BOARDS (RM)

ORDERING INFORMATION

BILL OF MATERIALS
Table 1.

RELATED LINKS

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.
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