AD8174-EB User Guide UG-819 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 AD8174 250 MHz, 10 ns Switching Multiplexer with Amplifier FEATURES GENERAL DESCRIPTION Full-featured evaluation board for the AD8174 5 V operation The AD8174 is a high speed buffered multiplexer that offers an internal current feedback output amplifier whose gain is programmed via external resistors and is capable of delivering 50 mA of output current. The AD8174 offers -3 dB signal bandwidth of 250 MHz and a slew rate greater than 1000 V/s. The AD8174 has excellent video specifications with low differential gain of 0.02%, low differential phase error of 0.05, and 0.1 dB flatness out to 85 MHz. With a low -78 dB at 5 MHz of crosstalk and better than -88 dB at 5 MHz isolation, the AD8174 is useful in many high speed applications. It is also a low power device consuming only 9.7 mA from a 5 V supply. EVALUATION KIT CONTENTS AD8174-EB evaluation board EQUIPMENT NEEDED Signal source or video pattern generator and signal analyzer Power supplies (+2 V/1 A and 5 V/1 A) SMA to BNC cables for inputs, outputs, and other pins The AD8174 offers a high speed disable feature that allows the user to put the output into a high impedance state for cascading stages so that the off channels do not load the output bus. In addition, the AD8174 can be shut down when not in use to minimize power consumption (IS = 1.5 mA). The AD8174 is available in 14-lead PDIP and 14-lead SOIC packages. Full details about the device are available in the AD8174 data sheet, which should be consulted when using the AD8174-EB. AD8174 IN0 1 +1 14 +VS GND 2 2 GND 4 IN2 5 12 -VIN +1 11 SD +1 LOGIC IN1 3 13 VOUT -VS 6 IN3 7 +1 10 ENABLE 9 A1 8 A0 13001-001 2 Figure 1. AD8174 4:1 Buffered Multiplexer. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 7 UG-819 AD8174-EB User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Introduction ...................................................................................3 Evaluation Kit Contents ................................................................... 1 Power Supply..................................................................................3 Equipment Needed ........................................................................... 1 Analog Inputs ................................................................................3 General Description ......................................................................... 1 Analog Output ...............................................................................3 Revision History ............................................................................... 2 Shutdown (SD) and ENABLE Pins .............................................3 Evaluation Board Hardware ............................................................ 3 Evaluation Board Schematic and Artwork.....................................5 REVISION HISTORY 3/15--Revision 0: Initial Version Rev. 0 | Page 2 of 7 AD8174-EB User Guide UG-819 EVALUATION BOARD HARDWARE INTRODUCTION SHUTDOWN (SD) AND ENABLE PINS The AD8174-EB evaluation board allows the user to easily evaluate the AD8174 in its various gain configurations. Figure 2 shows the typical evaluation board setup used to evaluate the buffered multiplexer. The SD pin, if set to high, shuts off the supply current for all the switches, some of the logic control circuitry, and the amplifier, reducing the quiescent current drain to 1.5 mA. POWER SUPPLY The AD8174-EB requires a typical 5 V power supply to power up the device via the +VS and -VS pins. ANALOG INPUTS The AD8174-EB has four input channels: IN0, IN1, IN2, and IN3. The input channels are activated by varying the voltage level of the digital control pins, A0 and A1. To make the digital control pins (A0 and A1) logic high, supply a minimum input of 2 V. To make the digital control pins (A0 and A1) logic low, supply a maximum input of 0.8 V. Table 1 shows the truth table for setting the inputs. By default, all inputs are terminated with 75 resistors in order to receive video signals. To use the evaluation board in nonvideo applications where 50 termination is more popular, replace these resistors with 50 values. Digital control pins, such as A0 and A1, are terminated with 50 resistors to allow easy connection to laboratory equipment. Tie any unused input channels to ground. The ENABLE pin, if set to high, shuts off the supply current of the amplifier, making the output of the amplifier into a high impedance that allows the AD8174-EB to be used in larger arrays. Both the ENABLE and SD pins are terminated with 50 resistors to allow easy connection to laboratory equipment. If the ENABLE and SD functions are not used, tie these respective pins to ground for proper operation. Table 1. AD8174-EB Truth Table A0 A1 ENABLE SD VOUT 0 1 0 1 X1 X1 0 0 1 1 X1 X1 0 0 0 0 1 X1 0 0 0 0 0 1 IN0 IN1 IN2 IN3 High-Z, IS = 4.1 mA High-Z, IS = 1.5 mA 1 X = don't care. ANALOG OUTPUT The AD8174-EB has only one output (OUT) that can be put into a high impedance state for cascading stages by setting the ENABLE pin (see Table 1). OUT is terminated by default with a 75 resistor. By default, the gain of the output amplifier is set to +2, but other gain configurations can be set by replacing the two gain resistors. Table 2 shows the recommended resistor values for gain settings. Table 2. Recommended Feedback, Series Resistors, and Bandwidth vs. Capacitive Load and Gain CL (pF) 20 50 100 300 RF (k) 1 1 2 2 RSOUT () 50 30 20 20 G = +1 VOUT = 2 V p-p - 3 dB Bandwidth (MHz) 149 104 73 27 RF (k) 1 1 1 1 G = +2 VOUT = 2 V p-p - 3 dB RSOUT () Bandwidth (MHz) 20 174 15 117 15 80 15 34 Rev. 0 | Page 3 of 7 RF () 499 1k 1k 1k RSOUT () 25 15 15 15 G = +3 VOUT = 2 V p-p - 3 dB Bandwidth (MHz) 170 98 71 33 G +4 RF RSOUT () () 499 20 499 20 499 15 499 15 UG-819 AD8174-EB User Guide DC POWER SUPPLY OSCILLOSCOPE ANALOG INPUT WAVEFORM/SIGNAL GENERATOR ANALOG OUPUT DISPLAY ANALOG INPUTS DC POWER SUPPLY ANALOG INPUT Figure 2. Typical Evaluation Board Setup Rev. 0 | Page 4 of 7 13001-002 VIDEO PATTERN GENERATOR AD8174-EB User Guide UG-819 EVALUATION BOARD SCHEMATIC AND ARTWORK C3 10F IN1 IN2 R1 75 1 2 GND R2 75 3 R3 75 C1 10F 5 13 VIN +1 4 GND -VS 2 7 12 11 +1 6 -VS C2 0.1F IN3 +VS 14 +1 LOGIC IN0 +1 10 9 8 2 R4 75 C4 0.1F +VS R11 75 R10 549 VOUT R9 549 R8 50 R7 50 R6 50 R5 50 SD ENABLE A1 A0 13001-003 AD8174 13001-005 13001-004 Figure 3. Evaluation Board Schematic Figure 4. Component Side Silkscreen Figure 5. Solder Side Silkscreen Rev. 0 | Page 5 of 7 AD8174-EB User Guide 13001-006 13001-008 UG-819 Figure 6. Component Side Layout 13001-007 13001-008 Figure 8. Solder Side Layout Figure 9. Evaluation Board Bottom View Figure 7. Evaluation Board Top View Rev. 0 | Page 6 of 7 AD8174-EB User Guide UG-819 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. (c)2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG13001-0-3/15(0) Rev. 0 | Page 7 of 7