EVAL-ADUM3481EBZ

Evaluation Board User Guide UG-546 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 iCoupler ADuM3480/ADuM3481/ADuM3482 Quad-Channel Digital Isolators FEATURES GENERAL DESCRIPTION Access to all 4 data channels Multiple connection options Support for Tektronix active probes Provision for cable terminations Support for PCB edge-mounted coaxial connectors Easy configuration Installed iCoupler digital isolator: ADuM3481 The EVAL-ADuM3481EBZ supports the ADuM3480/ ADuM3481/ADuM3482, which are 3750 V isolation rating, 4-channel iCoupler® isolators. The evaluation board provides a JEDEC standard 20-lead SSOP pad layout, support for signal fanout, and loopback as well as optimal bypass capacitance. Signals can be wired onto the board as well as brought onto the board through edge-mounted SMA connectors (sold separately) or terminal blocks for power connections. The board includes 200 mil header positions for compatibility with Tektronix active probes. SUPPORTED iCoupler MODELS ADuM3480 ADuM3481 ADuM3482 The board follows best printed circuit board (PCB) design practices for 4-layer boards, including a full power and ground plane on each side of the isolation barrier. No other EMI or noise mitigation design features are included on this board. In cases of very high speed operation or when ultralow emissions are required, refer to the AN-1109 application note for additional board layout techniques. 11404-001 PHOTOGRAPH OF THE EVALUATION BOARD Figure 1. EVAL-ADuM3481EBZ Evaluation Board See the last page for an important warning and disclaimers. Rev. 0 | Page 1 of 8 UG-546 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Connectors .....................................................................................3 Supported iCoupler Models ............................................................ 1 Power Input ....................................................................................3 General Description ......................................................................... 1 Data I/O Structures .......................................................................4 Photograph of the Evaluation Board .............................................. 1 Bypass on the PCB ........................................................................4 Revision History ............................................................................... 2 High Voltage Capability ...............................................................4 Evaluation Board Circuitry ............................................................. 3 Evaluation Board Schematics and Artwork ...................................5 PCB Evaluation Goals .................................................................. 3 Bill of Materials ..................................................................................7 REVISION HISTORY 10/13—Revision 0: Initial Version Rev. 0 | Page 2 of 8 Evaluation Board User Guide UG-546 EVALUATION BOARD CIRCUITRY PCB EVALUATION GOALS The EVAL-ADuM3481EBZ board is intended to achieve the following goals: • • • • Evaluate the full range of iCoupler data transfer functions Power each side of the iCoupler isolator independently Allow high differential voltage to be applied between the two sides of the iCoupler isolator Allow connecting easily to power and instrumentation Although the evaluation board comes with the ADuM3481 iCoupler digital isolator installed, the board is also compatible with the ADuM3480 and ADuM3482, and the user can substitute either of these components in place of the ADuM3481. CONNECTORS The PCB provides support for three types of interconnections: • • • SMA edge-mounted connectors Through-hole signal ground pairs Terminal blocks for power connections With these three options, both temporary and permanent connections to the board can easily be made. When coaxial connections are desired, SMA connector positions are available for VDD1, VDDL1, VDD2, and VDDL2 power supplies, as well as all digital inputs and outputs. These SMA connector positions are left unpopulated so that the user can customize the connectors for a given application. Figure 2 shows examples of installed SMA connectors; these connectors were chosen because they are not only low profile and provide excellent mechanical connections to the PCB but also support 50 Ω coaxial cabling. Because most lab equipment is compatible with BNC connectors, adaptors may be required to use some on-board connectors. 1) SCOPE PROBE Power can be connected through the VDDL1A, VDD1A, VDDL2A, and VDD2A terminal blocks, or can be wired directly to the PCB via the P5A, P6A, P11A, and P12A through-hole connectors. Each through-hole pair provides a power ground pair with the power on the Pin 1 hole. The pin spacing of each through-hole connector is 200 mil between centers. This matches the pin spacing required for Tektronix active scope probes. If a scope probe connection is desired, the header shown in Figure 2 can be soldered into the through-hole positions, and the signal pin can be trimmed to match the height requirements of a Tektronix active scope probe. POWER INPUT Each side of the ADuM3480/ADuM3481/ADuM3482 iCoupler isolator may require two off-board power sources. The power supplies for each side of the isolator can be common or independent, depending on the requirements of the application. Refer to the ADuM3480/ADuM3481/ADuM3482 data sheet for proper voltage ranges and combinations. To support all possible power configurations, two power inputs are provided on each side of the part—one input for VDD and one for VDDL. Because VDD and VDDL are often connected together so that a single power supply can be used, the ADuM3480/ADuM3481/ADuM3482 also provide a jumper position to allow these inputs to be connected together on the PCB through JP1 and JP2—one connection for each side of the board. If independent power supplies are to be used for VDD and VDDL, remove the corresponding jumper so that the power supply inputs are not connected together and apply power to both of the power inputs. Sharing a single supply and ground for both sides of the part (across the isolation barrier) does not harm the isolator, and is useful for functional testing of the ADuM3480/ADuM3481/ ADuM3482 iCoupler isolator when common-mode voltages are not present. If common-mode voltage are to be applied across the isolation barrier, independent power supplies must be provided for each side of the isolator. A ground and two power planes are present on Layer 2 and Layer 3 of the PCB on each side of the isolation barrier. 2) SMA CONNECTOR 5) SCOPE PROBE HEADER 3) TERMINAL BLOCK 4) SHORTING JUMPER 11404-002 6) PADS TO CONNECT SMA Figure 2. Optional Components Rev. 0 | Page 3 of 8 UG-546 Evaluation Board User Guide DATA I/O STRUCTURES Figure 2 shows many of the optional components installed, as well as how jumpers can be used to temporarily connect channels. This figure shows a signal connected to the first channel SMA and then fanned out to the top three channels and monitored by an active scope probe. Each data channel has a variety of structures to help configure, load, and monitor both the input and output. Figure 3 shows one of the datapaths from an external connection to the DUT pin. Each channel has similar connections. Starting at the external connection, the signal path is BYPASS ON THE PCB 1. Several positions and structures are provided to allow optimum bypass of the evaluation board. Provision has been made for optional surface-mount bulk capacitors to be installed near the power connectors to compensate for long cables to the power supply. Parallel bypass capacitors are installed near the ADuM3481 and consist of a 0.1 µF capacitor for each VDDx, VDDCx, and VDDLx on the top side and a 0.1 µF capacitor for each VDDx,VDDCx, and VDDLx on the bottom side of the board. It is best to use the top side bypass positions if possible. 3. 4. 5. 6. 7. 8. The PCB also implements a distributed capacitive bypass on the PCB. This consists of power and ground planes closely spaced on the inner layers of the PCB. This minimizes noise and the transmission of EMI without using complex design features. HIGH VOLTAGE CAPABILITY This PCB is designed in adherence with 2500 V basic insulation practices. High voltage testing beyond 2500 V is not recommended. Appropriate care must be taken when using this evaluation board at high voltages, and the PCB should not be relied on for safety functions because it has not been high potential tested (also known as hipot tested or dielectric withstanding voltage tested) or certified for safety. 1 SMA CONNECTOR PADS 6 OPEN HOLES FOR SOLDERED WIRES OR 200mil TEKTRONIX HEADER, GND/GND/SIGNAL 8 CONNECT TO NEXT CHANNEL UP 2 TERMINATION 2 × 100Ω 8 CONNECT TO NEXT CHANNEL DOWN 5 2-PIN HEADER GND/SIGNAL 4 PULL-UP PAD 7 PULL-DOWN PAD 3 CONNECT TO SMA NOTES 1. THE NUMBERED COMPONENTS IN THIS FIGURE CORRESPOND TO THE DESCRIPTIONS IN THE DATA I/O STRUCTURES SECTION. 11404-004 2. A pad layout for a PCB board edge-mounted SMA connector. Two 0805 pads are provided where 100 Ω resistors to ground can be installed. The combined resistance is 50 Ω to provide a termination for a standard coaxial cable. A standard 0805 pad layout that allows the coaxial and termination structures to be connected to the rest of the signal path. A 0605 pad layout between the signal path and VDDx can be used for installing a pull-up resistor. A populated 2-pin header provides a signal ground pair that can be used for clip leads or for shorting a channel to ground temporarily. There is a grouping of three open through holes, consisting of a signal and two ground connections. This can be used for hardwiring signal wires into the PCB, installing a header to accept a Tektronix active probe, or installing a 2-pin header to allow adjacent channels to temporarily be shorted together. A 0805 pad layout between the signal and ground where a load capacitor or resistor can be installed. Pads to the adjacent channels are provided to allow permanent connection of adjacent channels. Inputs can be fanned out to several channels, or inputs and outputs can be connected together to allow signals to loopback. Figure 3. Configuration and Monitoring Structures (Showing a Datapath from an External Connection to the DUT Pin) Rev. 0 | Page 4 of 8 Evaluation Board User Guide UG-546 11404-003 EVALUATION BOARD SCHEMATICS AND ARTWORK Figure 4. EVAL-ADuM3481EBZ Schematic Rev. 0 | Page 5 of 8 Evaluation Board User Guide 11404-005 UG-546 Figure 5. Top Side Layout Rev. 0 | Page 6 of 8 Evaluation Board User Guide UG-546 BILL OF MATERIALS Table 1. Bill of Materials Qty 1 14 46 Reference Designator U1 C1, C2, C3, C4, C5A, C8T, C9T, C10, C11, C14T, C15T, C18A, C23T, C24T R1A to R46A 6 C1A to C4A, C19A, C22A 4 14 10 12 VDDL1A, VDDL2A, VDD1A, VDD2A P2, P3, P13, P14, P1A to P10A JP1, JP2, P1B to P4B, P7B to P10B J1A to J12A 1 Description DUT 0.1 µF, 25 V, 10%, 0805 Part Number 1 Analog Devices, Inc., ADuM3481 DNI 0805 pad for optional, application-specific connections 0603 pad for optional, application-specific connections Terminal block 2-pin header, 200 mil spacing (not installed) 2-pin header 100 mil spacing SMA edge connector (not installed) DNI DNI = do not install. Rev. 0 | Page 7 of 8 DNI Weidmüller 1716090000 Samtec MTSW-202-12-G-S-730 Samtec HTSW-102-07-T-S Johnson/Emerson Network Power Connectivity Solutions, Inc., 142-0701-851 UG-546 Evaluation Board User Guide 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. 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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. ©2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG11404-0-10/13(0) Rev. 0 | Page 8 of 8