evaluation board user guide ug - 422 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 ad8476 differential amplifier evaluation board for 8 - lead msop package please see the last page for an important warnin g and legal terms and conditions . rev. 0 | page 1 of 8 features enables quick evaluation of ad8476 enables quick breadboarding/prototyping allows for various circuit configurations through - hole connector provisions easy c onnection to test equipment and other circuits rohs compliant general description the ad8476 - e va l z makes it easy for designers to obtain quick performance results for their particular application circuit using the ad8476 low power, fully - differential g = 1 amplifier. the board layout is flexible enough to allow for different circuit configura tions, including options for single - ended or differ - ential inputs, and spa ce for output loading and filtering . most resistors and capacitors use 0603 packages . the 4 - layer evaluation board accepts through - hole sma or smb connectors on input s, output s , and vocm , which allows an efficient and quick connection to test equipment or other circuitry . there is also room for 2 - pin berg headers at the inputs and outputs for connection to differential probes, and test points at supply and ground pins. the board ground plane, component placement, and power supply bypassing have been optimi zed for maximum circuit flexibility and performance . figure 1 and figure 2 show the component side and circuit side of the evaluation board. figure 3 shows the evaluation board s chematic. figure 4 show s the evaluation board assembly drawing. the metal layout pattern for connecting the board to the op amp and to the supporting circuitry is shown in figure 5 and figure 6 . the board accommodates the ad8476 differential amplifier in an 8 - lead msop . t he ad8476 data sheet for this device should be consulted in conjunct ion with this evaluation board user guide . 10778-001 figure 1 . component side (msop) 10778-002 figure 2 . circuit side (msop)
ug- 422 evaluation board user guide rev. 0 | page 2 of 8 table of contents features .............................................................................................. 1 general description ......................................................................... 1 revision history ............................................................................... 2 ad8476 evaluation board schematic ............................................ 3 evaluation board hardware ............................................................ 4 power supplies .............................................................................. 4 vocm i nput ..................................................................................4 smb input/output connectors ...................................................4 evaluation board layout ..................................................................5 o rdering information .......................................................................6 bill of materials ..............................................................................6 related links ......................................................................................6 revision history 5 /1 2 revision 0: in itial version
evaluation board user guide ug- 422 rev. 0 | page 3 of 8 ad8476 evaluation board sch ematic + v s ? v s v o c m i n ? i n + o u t ? o u t + v o c m r 3 * r 4 * r 5 * r 6 * r 7 * r 8 * r 9 * r 1 0 * c 1 0 . 1 f + c 3 1 0 f c 5 * 0 . 1 f j p 2 c 4 1 0 f + c 2 0 . 1 f j 1 j 2 j 3 j 5 j 4 + ? 7 8 6 5 2 1 3 4 1 0 k 1 0 k 1 0 k 1 0 k a d 8 4 7 6 i n n i n p ? v s n c ? o u t + o u t v o c m + v s r 1 * r 2 * j p 1 * u s e r d e f i n e d v a l u e 10778-003 figure 3. ad8476 evaluation board schematic
ug- 422 evaluation board user guide rev. 0 | page 4 of 8 evaluation board har dware power supplies po wer is applied to the board through test pins +v s and ? v s (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 p ower supply pins of the device under test (dut) have a broadband decoupling circuitry. the board layout facil itates this with footprints for a 0 6 0 3 ceramic capacitor ( c 1 and c 2 ) on each supply. bulk decoupling is provided by c 3 and c 4 ; 10 f tantalum capac itors are recommended. v ocm input to set the output common - mode voltage of the ad8476 , a n external voltage can be applied to vocm via j3 (referenced to the ground plane of the board) or the vocm test poi nt . in adc driving applications, it is convenient to apply the adc dc reference voltage output directly to j3 . a 0.1 f capacitor (c5) is used in normal applications to provide bypassing for the dc voltage applied to the v ocm pin. vocm can also be left u nconnected. the ad8476 internally set s the output common - mode to mid - supply. sm b input/output connect ors the inputs and outputs have through - hole smb connector footprint s (which are compatible with most sma con nector footprints) for convenient connection to coaxial cables. the recom mended connector type is johnson components? , part number 1 31- 0701 - 371 (jack) and 131 - 1801- 371 (plug) , or equivalent.
evaluation board user guide ug- 422 rev. 0 | page 5 of 8 evaluation board layout 10778-004 figure 4 . assembly drawing component side 10778-005 figure 5 . component side metallization (msop) 10778-006 figure 6 . circuit side metallization (msop)
ug- 422 evaluation board user guide rev. 0 | page 6 of 8 ordering information bill of materials table 1 . qty reference designator package description 2 c3 , c 4 c7343 10 f capacitor 2 c1, c2 c 0 6 0 3 capacitor, 0.1 f 5 j1 to j 5 sm b pcm smb c onnector 9 r1 to r12 r 0603 resistor, u ser d efined v alue 7 +v s, ? v s, v ocm , gnd1 to gnd4 tp 1 test point 2 jp1, jp2 2 - pin header 2 - pin berg ii 0.100 straight header 1 d u t 1 8 - lead msop device under test 1 pc board related links table 2 . resource description ad8476 product p age , low power, unity gain fully differential amplifier and adc driver
evaluation board user guide ug- 422 rev. 0 | page 7 of 8 notes
ug- 422 evaluation board user guide rev. 0 | page 8 of 8 notes esd caution esd (electrostatic discharge) sensitive device . charged devices and circuit boards can discharge without detection. althou gh 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 avo id performance degradation or loss of functionality. legal terms and c onditions 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 ha ve purchased the evaluation board, in which case the analog devices standard terms and conditions of sale shall govern. do no t use the evaluation board until you have read and agreed to the agreement. your use of the evaluation board shall signify your acc eptance 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 conditi ons of the agreement, ad i 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 evalu ation board is provided for the sole and exclusive purpose referenced above, and agrees not to use the evaluation board for any other purpose. furthermor e, the license granted is expressly made subject to the following additional limitations: customer shall not (i) rent, lease, disp lay, sell, transfer, assign, sublicense, or distribute the evaluation board; and (ii) permit any third party to access the ev aluation board. as used herein, the term third party includes any entity other than adi, customer, their employees, affiliates an d 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 considere d 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 o f the evaluation board or termination of this agreement, custom er agrees to promptly return the evaluation board to adi. additional restrictions. customer may not disassemble, decompile or reverse engi neer chips on the evaluation board. customer shall inform adi of any occurred damages or any modifications or alterati ons 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 t o 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 boar d 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, g uarantees, 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 intellectu al property rights. in no event will adi and its licensors be liable for any incidental, special, indirect, or consequential dam age s resulting from customers possession or use of the evaluation board, including but not limited to lost profits, delay costs, labor costs or loss of goodwill. adis total li ability from any and all causes shall be limited to the amount of one hundred us d ollars ($100.00). export. customer agrees that it will not directly or indirectly export the evaluation board to another coun try, and that it will comply with all applicable united states federal laws and regulations relating to exports. governing law. th is 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 fede ral courts having ju risdiction 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 internation al sale of goods shall not apply to this agreement and is expressl y disclaimed. ? 2012 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. ug10778 - 0 - 5/12(0)
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