Evaluation Board User Guide UG-324 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 the AD5116 Digital Potentiometer FEATURES GENERAL DESCRIPTION Full-featured evaluation board for the AD5116 Several test circuits Various ac/dc input signals This user guide describes the evaluation board for evaluating the AD5116—a single-channel, 64-position, nonvolatile memory digital potentiometer. PACKAGE CONTENTS The AD5116 supports single-supply 2.3 V to 5.5 V operation, making the device suited for battery-powered applications and many other applications, offering guaranteed low resistor tolerance errors of ±8% and high bandwidth while allowing up to ±6 mA current density in the A, B, and W pins. EVAL-AD511xSDZ evaluation board CD that includes Electronic version of the AD5116 data sheet Electronic version of the UG-324 user guide A simple push-button interface allows manual switching and can save the last wiper position automatically into the EEPROM, making it suits to applications that require a power-up in the last wiper position. Complete specifications for the AD5116 part can be found in the AD5116 data sheet, which is available from Analog Devices, Inc., and should be consulted in conjunction with this user guide when using the evaluation board. 10202-001 DIGITAL PICTURE OF EVALUATION BOARD Figure 1. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 8 UG-324 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 ASE Configuration ........................................................................3 Package Contents .............................................................................. 1 Push Buttons ..................................................................................3 General Description ......................................................................... 1 Test Circuits ...................................................................................4 Digital Picture of Evaluation Board ............................................... 1 Evaluation Board Schematics and Artwork ...................................5 Revision History ............................................................................... 2 Ordering Information .......................................................................8 Evaluation Board Hardware ............................................................ 3 Bill of Materials ..............................................................................8 Power Supplies .............................................................................. 3 REVISION HISTORY 11/11—Revision 0: Initial Version Rev. 0 | Page 2 of 8 Evaluation Board User Guide UG-324 EVALUATION BOARD HARDWARE POWER SUPPLIES ASE CONFIGURATION The EVAL-AD5116SBZ supports using single power supplies. The part allows the user to configure the automatic store enable before powering up the board. If the ASE function is enabled, the led, D2, indicates when minimum/maximum resistance has been reached. The AD5116 data sheet provides a detailed description of this pin. The evaluation board should be powered externally by the EXTERNAL-1 and EXTERNAL-2 connectors, as described in Table 2. The link LK8 should be connected as shown in Table 1. All supplies are decoupled to ground using 10 µF tantalum and 0.1 µF ceramic capacitors. The EVAL-AD5116EBZ provides three switches to operate the part: Table 1. Link Connections Link No. LK8 PUSH BUTTONS Option +5V and EXT • • • PU. This switch increases the resistance between RWB. PD. This switch decreases the resistance between RWB. NVM. This push button is enabled when the ASE function is disabled and allows manually storage of the RDAC register into the NVM. Table 2. Maximum and Minimum Voltages of the Connectors Connector No. EXTERNAL-1 EXTERNAL-2 Label VDD AGND Voltage Analog positive power supply, VDD. It is 2.3 V to 5.5 V. Analog ground, AGND. Rev. 0 | Page 3 of 8 UG-324 Evaluation Board User Guide TEST CIRCUITS AC Signal Attenuation The EVAL-AD5116EBZ incorporates several test circuits to evaluate the AD5116 performance. The AD5116 can be used to attenuate an ac signal, which must be provided externally using the AC_INPUT connector, as shown in Figure 3. The AD5116 can be operated as a digital-to-analog converter (DAC), as shown in Figure 2. VDD 2 fC = 200Hz DC B A B AC 12Ω W B VOUT VDD 2 BUF-W B LK6 R7 R8 GND 10202-002 Table 4. AC Signal Attenuation Link Options Table 3. DAC Voltage References BUF-W VOUT Depending on the voltage supply rails and the dc offset voltage of the ac signal, various configurations can be used as described in Table 4. Table 3 shows the options available for the voltage references. W 12Ω Figure 3. AC Signal Attenuator Figure 2. DAC Link LK1 AC W B BUF-W R8 GND Terminal A W A W 750Ω A R9 750Ω A R9 Options AC DC AC GND Description Connects Terminal A to VDD/2 Connects Terminal A to VDD Connects Terminal W to an output buffer Connects Terminal B to VDD/2 Connects Terminal B to analog ground The output voltage is defined in Equation 1. VOUT AC HPF AC VDD VDD 2 VDD 2 AC_INPUT 10202-003 DAC RDAC = (VA − VB ) × 256 Terminal A Link LK1 W BUF-W B LK6 1 Options AC AC1 GND Description Remove dc voltage and biased the signal to VDD/2 Connects Terminal W to an output buffer Connects Terminal B to VDD/2 Connects Terminal B to analog ground Recommended to ensure optimal total harmonic distortion (THD) performance. The signal attenuation is defined in Equation 2. (1) where: RDAC is the code loaded in the RDAC register. VA is the voltage applied to Terminal A (LK1 link). VB is the voltage applied to Terminal B (LK6 link). RDAC Attenuation (dB) ≈ 20 × log 128 (2) where: RDAC is the code loaded in the RDAC register. However, by using the R8 and R9 external resistors, the user can reduce the voltage of the voltage references. In this case, use the A and B test points to measure the voltage applied to the A and B terminals and recalculate VA and VB in Equation 1. In addition, R7 can be used to achieve an exponential attenuation. To do so, adjust the R7 resistor until a desirable transfer function is found, typically value is around 1.6 kΩ for a 10 kΩ potentiometer. Rev. 0 | Page 4 of 8 Evaluation Board User Guide UG-324 10202-004 EVALUATION BOARD SCHEMATICS AND ARTWORK Figure 4. Schematic of the AD5116 Circuitry Rev. 0 | Page 5 of 8 Evaluation Board User Guide 10202-006 UG-324 10202-007 Figure 5. Component Placement Drawing Figure 6. Component Side PCB Drawing Rev. 0 | Page 6 of 8 UG-324 10202-008 Evaluation Board User Guide Figure 7. Solder Side PCB Drawing Rev. 0 | Page 7 of 8 UG-324 Evaluation Board User Guide ORDERING INFORMATION BILL OF MATERIALS Table 5. Qty 1 1 1 1 1 1 1 3 7 1 1 1 1 1 4 2 2 2 6 1 1 1 1 Reference Designator C3 C1 C25 C24 D1 D2 EXTERNAL PD, PU, NVM LK1, LK3, LK4, LK5, LK6, LK8, ASE BUF-W R11 R10 R4 R1 R5, R6, R12, R13 R2, R3 R8, R9 DGND, AGND 3V3, A, B, VDD, VOUT, W U1 U3 U15 Description 100 nF capacitor, 0402 0.1 µF capacitor, 0603 0.1 µF capacitor, 0603 10 µF capacitor, 1206 LED, green LED, red 2-pin connector Push-button Header, 2-row, 36 + 36 way, and jumper socket, black Header, 1-row, 2-way, and jumper socket, black 12 Ω resistor, 0603, 1% 750 Ω resistor, 0603, 1% 1 kΩ resistor, 0603, 0.01% 1.8 kΩ resistor, 0805, 1% 2.7 kΩ resistor, 1206, 1% 110 kΩ resistor, 0603, 1% 0 Ω resistor, 0603 Test point, PCB, black, PK100 Test point, PCB, red, PK100 AD5116 ADA4860 AD8652 Supplier 1/Part Number FEC 1414580 FEC 138-2224 FEC 301-9482 FEC 197-130 FEC 579-0852 FEC 1685068 FEC 151789 FEC 177-807 FEC 148-535 and FEC 150-411 FEC 102-2247 and FEC 150-411 FEC 9330534 FEC 9331506 FEC 9330380 FEC 1400055 FEC 9337288 FEC 9331247 FEC 9331662 FEC 873-1128 FEC 873-1144 Analog Devices AD5116 Analog Devices ADA4860 Analog Devices AD8652 FEC refers to Farnell Electronic Component Distributors. I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors). 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. ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG10202-0-11/11(0) Rev. 0 | Page 8 of 8