EVAL-ADM2587EEB2Z

EVAL-ADM2587EEB2Z User Guide UG-1266 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 Evaluating the Isolated RS-485 Repeater Using the ADM2587E 2.5 kV rms Signal and Power Isolated RS-485/RS-422 Transceiver with ±15 kV ESD Protection FEATURES GENERAL DESCRIPTION 2.5 kV rms power and signal isolated RS-485/RS-422 transceiver PCB layout optimized for EN55022 radiated emissions according to the AN-1349 Application Note 4-layer PCB layout that minimizes PCB material cost Convenient connections for power and signal through screw terminal blocks Configured as half-duplex 5 V or 3.3 V VCC operation Flow control circuit removes the requirement for jumper connections Test points for measuring all signals Use the ADM2587E isolated repeater evaluation board to easily evaluate the ADM2587E power and signal isolated RS-485/RS-422 transceiver. Screw terminal blocks provide convenient connections for the power and signal connections. The evaluation board does not require jumper connections because flow control is implemented with a high speed comparator circuit. The board is configured as half-duplex and has a 120 Ω termination resistor fitted on the receiver inputs. Test points are included on the power and signal lines on both sides of the isolation barrier. The ADM2587E evaluation board is designed to reduce emissions generated by the high frequency switching elements used by the isoPower® technology to transfer power through the ADM2587E integrated transformer. The layout of the evaluation board uses the guidelines provided in the AN-1349 Application Note, PCB Implementation Guidelines to Minimize Radiated Emissions on the ADM2582E/ADM2587E RS-485/RS-422 Transceivers. EVALUATION KIT CONTENTS EVAL-ADM2587EEB2Z DOCUMENTS NEEDED AN-1349 Application Note AN-1458 Application Note ADM2582E/ADM2587E data sheet 16700-001 EVALUATION BOARD PHOTOGRAPH Figure 1. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 10 UG-1266 EVAL-ADM2587EEB2Z User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Board Internal Layer Thickness ..................................................4 Evaluation Kit Contents ................................................................... 1 Overlapping Stitching Capacitor .................................................4 Documents Needed .......................................................................... 1 PCB Layout Recommendations ..................................................4 General Description ......................................................................... 1 Evaluation Board Schematics and Artwork ...................................5 Evaluation Board Photograph......................................................... 1 Ordering Information .......................................................................9 Revision History ............................................................................... 2 Bill of Materials ..............................................................................9 Evaluation Board Hardware ............................................................ 3 Related Links ............................................................................... 10 Test Setup ....................................................................................... 3 Cable Connection and Bus Capacitance ................................... 3 REVISION HISTORY 4/2018—Revision 0: Initial Version Rev. 0 | Page 2 of 10 EVAL-ADM2587EEB2Z User Guide UG-1266 EVALUATION BOARD HARDWARE TEST SETUP CABLE CONNECTION AND BUS CAPACITANCE Figure 2 shows the EVAL-ADM2587EEB2Z evaluation board. The evaluation board does not require jumper connections because flow control is implemented with an ADCMP600 high speed comparator circuit. The board is configured as half-duplex and has a 120 Ω termination resistor fitted on the receiver inputs. Test points are included on the power and signal lines on both sides of the isolation barrier. Power the evaluation board with 3.3 V or 5 V on the P2 terminal block. Confirm basic operation of the evaluation board using a signal generator at the P1 terminal block. Refer to the Cable Connection and Bus Capacitance section for more information. Use an oscilloscope to confirm that the voltage waveforms at TP1 (A) and TP2 (B) match the output of the RS-485 repeater at TP10 (B) and TP11 (A). Use the EVAL-ADM2587EEB2Z P1 and P3 terminal blocks to attach a Category 5e RS-485 cable to the ADM2587E A and B bus pins. Route the RS-485 cable to other RS-485 evaluation boards to create a multinode setup. Alternatively, use a signal generator to simulate bus differential voltage inputs to P1, as shown in Figure 2. In this configuration, insert a 1.5 nF wire wound capacitor between the A and B connectors on both the P1 and P3 terminal blocks. This 1.5 nF capacitor simulates the capacitance from 20 m of Category 5e RS-485 cable. 3.3V OR 5V POWER SUPPLY SIGNAL GENERATOR VCC OSCILLOSCOPE GND0 A A B B GND2 16700-002 GND1 Figure 2. Basic Operation of the EVAL-ADM2587EEB2Z Isolated RS-485 Repeater Evaluation Board Rev. 0 | Page 3 of 10 UG-1266 EVAL-ADM2587EEB2Z User Guide BOARD INTERNAL LAYER THICKNESS The EVAL-ADM2587EEB2Z evaluation board consists of four layers. The spacing between the top and bottom layer is 1.6 mm. The EVAL-ADM2587EEB2Z printed circuit board (PCB) has a minimum distance of 0.4 mm of insulation along a bonded surface, meeting requirements for IEC 61010, third edition, and IEC 60950 isolation standards as described in the AN-1109 Application Note, Recommendations for Control of Radiated Emissions with iCoupler® Devices. To pass EN55022 Class B on a 4-layer PCB, the following layout guidelines are recommended: 1. 2. 3. OVERLAPPING STITCHING CAPACITOR The evaluation board implements an embedded stitching capacitor structure. An embedded PCB capacitor is created when two metal planes in a PCB overlap each other and are separated by dielectric material. This embedded stitching capacitor is formed by extending the internal reference planes from the primary and secondary layers (which are used for creepage on the PCB surface) across the area. This capacitor provides a return path for high frequency common-mode noise currents across the isolation gap. The layout and implementation of embedded stitching capacitors is explained in detail in the AN-0971 Application Note. PCB LAYOUT RECOMMENDATIONS The EVAL-ADM2587EEB2Z evaluation board reduces emissions generated by the high frequency switching elements used by the isoPower technology to transfer power through the ADM2587E integrated transformer. The layout of the evaluation board is generated using the guidelines provided in the AN-1349 Application Note. 4. Ensure that there is sufficient decoupling on the PCB. Use the decoupling capacitors recommended in Figure 4. Place a ferrite bead between the PCB trace connections and the following IC pins: VISOOUT (Pin 12) and GND2 (Pin 11 and Pin 14). Do not connect the VISOOUT pin to a power plane; connect between VISOOUT and VISOIN using a PCB trace. Ensure that VISOIN (Pin 19) is connected through the E1 ferrite to VISOOUT (Pin 12). Place an embedded stitching capacitor between the GND1 and GND2 pins using internal layers of the PCB planes (see the Overlapping Stitching Capacitor section). The following additional notes apply to the PCB layout (refer to the Evaluation Board Schematics and Artwork section): • • • • 16700-003 The AN-1349 Application Note provides examples of 4-layer PCBs. The EVAL-ADM2587EEB2Z PCB layout is a 4-layer PCB. Ensure that GND2 (Pin 14) is connected to GND2 (Pin 11) on the inside (device side) of the C5 100 nF capacitor. Ensure that the C5 100 nF capacitor is connected between VISOOUT (Pin 12) and GND2 (Pin 11) on the device side of the E2 and E1 ferrites. Ensure that GND2 (Pin 16) is connected to GND2 (Pin 11) on the outside (bus side) of the E2 ferrite, as shown in Figure 3. Ensure that there is a keep out area for the GND2 plane in the PCB layout around the E2 and E1 ferrites. The keep out area means there must not be a GND2 fill on any layer below the E2 and E1 ferrites. Figure 3. Layout of the EVAL-ADM2587EEB2Z Rev. 0 | Page 4 of 10 Rev. 0 | Page 5 of 10 D3 GND1 CDSOT23-SM712 P1 1 2 3 CTB5000/3 TP1 YEL GND1 TP2 YEL TP3 BLK R3 DNI 120 R1 R2 DNI VCC_BAR VISO1 GND1 VCC_BAR VISO1 CTB5000/2 1 2 C1 10UF TP4 RED 1 E1 2 C2 0.1UF 2 1.8K AT 100MEGHZ 1 1.8K AT 100MEGHZ E2 VCC_BAR VISO1 GND1 GND0 C3 10UF VCC_BAR VCC C5 0.1UF C4 0.01UF GND0 VCC GND1 GND1 TxD DE 1 2 3 4 5 6 7 8 9 10 GND0 VCC_BAR C6 10UF ADM2587EBRWZ VISOOUT GND2 GND2 Y GND2 Z RE GND1 RxD A B GND1 VCC GND2 VISOIN VCC 20 19 18 17 16 15 14 13 12 11 U1 KP-2012SGC DS1 R4 698 VCC_BAR VCC C7 0.1UF R18 10K VCC_BAR VCC C8 0.01UF GND0 C10 5PF TP5 YEL C12 A Q U2 R7 5 VCC_BAR VCC - 4 3 GND0 2 VEE + 215 VCCI_O 0.1UF GND0 1 3.3K R5 C13 24.9K R6 1N914BWT D1 GND0 C11 10UF 100PF C GND0 C9 0.1UF VCC_BAR VCC R9 GND0 TP6 BLK ADCMP600BRJZ-R2 1.91K R8 4.3K 4 3 - + 2 215 R12 C15 1 GND0 C17 0.1UF 24.9K R14 1N914BWT 100PF D2 C Q U3 3.3K GND0 VEE C16 0.1UF VCCI_O 5 VCC_BAR VCC C14 10UF R13 ADCMP600BRJZ-R2 GND0 1.91K R10 R11 4.3K GND0 VCC_BAR VCC A GND0 GND0 C18 5PF TP7 YEL R19 10K VCC_BAR VCC C19 0.01UF VCC GND1 GND1 TxD DE RE GND1 RxD GND1 VCC VISOOUT GND2 GND2 Y GND2 Z B GND2 VISOIN A 20 19 18 17 16 15 14 13 12 11 U4 C20 0.1UF GND0 C21 10UF VCC_BAR VCC ADM2587EBRWZ 1 2 3 4 5 6 7 8 9 10 0.1UF C23 E3 1 C24 0.1UF VCC_BAR VISO2 1.8K AT 100MEGHZ 1 1.8K AT 100MEGHZ E4 C22 0.01UF GND2 2 2 GND2 C25 10UF VCC_BAR VISO2 TP8 RED R17 DNI 120 R15 R16 DNI VCC_BAR VISO2 TP9 BLK GND2 D4 GND2 1 2 3 CTB5000/ P3 CDSOT23-SM712 TP10 YEL TP11 YEL EVALUATION BOARD SCHEMATICS AND ARTWORK 16700-004 P2 EVAL-ADM2587EEB2Z User Guide UG-1266 Figure 4. Schematic of the EVAL-ADM2587EEB1Z Evaluation Board EVAL-ADM2587EEB2Z User Guide 16700-005 UG-1266 16700-006 Figure 5. Top Layer/Component Placement Figure 6. Silkscreen Rev. 0 | Page 6 of 10 UG-1266 16700-007 EVAL-ADM2587EEB2Z User Guide 16700-008 Figure 7. Second Layer Figure 8. Third Layer Rev. 0 | Page 7 of 10 EVAL-ADM2587EEB2Z User Guide 16700-009 UG-1266 Figure 9. Bottom Layer Rev. 0 | Page 8 of 10 EVAL-ADM2587EEB2Z User Guide UG-1266 ORDERING INFORMATION BILL OF MATERIALS Table 1. EVAL-ADM2587EEB2Z Bill of Materials Qty 7 2 2 Reference Designator C1, C3, C6, C11, C14, C21, C25 C10, C18 C12, C15 10 4 2 C2, C5, C7, C9, C13, C16, C17, C20, C23, C24 C4, C8, C19, C22 D1, D2 2 D3, D4 1 DS1 4 E1, E2, E3, E4 2 P1, P3 1 P2 2 2 R1, R15 R9, R10 2 2 2 R8, R11 R5, R12 R7, R13 2 2 R6, R14 R18, R19 1 6 3 2 2 R4 TP1, TP2, TP5, TP7, TP10, TP11 TP3, TP6, TP9 TP4, TP8 U1, U4 2 U2, U3 Description Ceramic X7R capacitor Ceramic NP0 0603 capacitor Ceramic, multilayer X7R capacitor Ceramic X7R 0603 capacitor Manufacturer Würth Elektronik AVX KEMET Part Number 885012000000 06035A5R0JAT2A C0603C101K5RAC AVX 06035C104KAT2A Ceramic C0G capacitor High conductance diode TDK Fairchild Semiconductor Bourns C1608C0G1H103K080AA 1N914BWT Kingbright KP-2012SGC Taiyo Yuden BKH1005LM182-T CamdenBoss Ltd CTB5000/3 CamdenBoss Ltd CTB5000/2 Multicomp (SPC) Panasonic MC 0.1W 0805 1% 120R. ERJ-3EKF1911V Panasonic Multicomp (SPC) Panasonic ERJ-3EKF4301V MC 0.063W 0603 1% 3K3. ERJ-3EKF2150V Yageo Yageo RC0603FR-0724K9L RC0603JR-0710KL Panasonic Vero Technologies Ltd Vero Technologies Ltd Vero Technologies Ltd Analog Devices ERJ-3EKF6980V 20-313140 20-2137 20-313137 ADM2587EBRWZ Analog Devices ADCMP600BRJZ-R2 Transient voltage suppressor diode Light emitting diode, surfacemount type D lamp, green 0.2 A inductor ferrite bead, 2 Ω maximum dc resistance 5 mm pitch, terminal block connector PCB 5 mm pitch, terminal block connector PCB Film SMD resistor 0805 Precision, thick film chip resistor 0603 Precision, thick film chip resistor Film SMD resistor 0603 Precision, thick film chip resistor R0603 General-purpose chip resistor General-purpose, thick film chip resistor Precision, thick film chip resistor Test point, yellow connector PCB Test point, black connector PCB Test point, red connector PCB Analog Devices, Inc., integrated circuit, signal and power isolated RS-485, XCVR ESD protection Analog Devices integrated circuit, single supply, TTL/CMOS comparator Rev. 0 | Page 9 of 10 CDSOT23-SM712 UG-1266 EVAL-ADM2587EEB2Z User Guide RELATED LINKS Resource ADM2587E AN-1458 AN-1349 AN-960 AN-1109 AN-0971 Description 2.5 kV Signal and Power Isolated, ±15 kV ESD Protected, Full/Half-Duplex RS-485 Transceiver (500 kbps) Application Note, Isolated RS-485 Repeater with Automatic Direction Control Application Note, PCB Implementation Guidelines to Minimize Radiated Emissions on the ADM2582E/ADM2587E RS-485/ RS-422 Transceivers Application Note, RS-485/RS-422 Circuit Implementation Guide Application Note, Recommendations for Control of Radiated Emissions with iCoupler Devices Recommendations for Control of Radiated Emissions with isoPower Devices 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. ©2018 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG16700-0-4/18(0) Rev. 0 | Page 10 of 10