Isolated, Single-Channel RS-232 Line Driver/Receiver Data Sheet ADM3251E FEATURES FUNCTIONAL BLOCK DIAGRAM C1 C3 C2 C4 2.5 kV fully isolated (power and data) RS-232 transceiver 0.1F 0.1F 0.1F 0.1F 16V 10V 0.1F 16V 16V isoPower integrated, isolated dc-to-dc converter 460 kbps data rate 1 Tx and 1 Rx V V+ C1+ C1 ISO C2+ C2 V Meets EIA/TIA-232E specifications VOLTAGE VOLTAGE ADM3251E DOUBLER INVERTER ESD protection on R and T pins IN OUT 8 kV: contact discharge V CC OSC RECT REG 15 kV: air gap discharge 0.1F 0.1 F charge pump capacitors DECODE ENCODE R R * IN R High common-mode transient immunity: >25 kV/s OUT Safety and regulatory approvals ENCODE DECODE T T OUT T UL recognition IN 2500 V rms for 1 minute per UL 1577 GND GND VDE Certificate of Conformity ISO DIN EN 60747-5-2 (VDE 0884 Teil 2): 2003-01 *INTERNAL 5k PULL-DOWN RESISTOR ON THE RS-232 INPUT. CSA Component Acceptance Notice 5A Figure 1. Operating temperature range: 40C to +85C Wide body, 20-lead SOIC package APPLICATIONS High noise data communications Industrial communications General-purpose RS232 data links Industrial/telecommunications diagnostic ports Medical equipment GENERAL DESCRIPTION 1 The ADM3251E is a high speed, 2.5 kV fully isolated, single- transformer. Special care must be taken during printed circuit channel RS-232/V.28 transceiver device that operates from a board (PCB) layout to meet emissions standards. Refer to single 5 V power supply. Due to the high ESD protection on the Application Note AN-0971, Control of Radiated Emissions with R and T pins, the device is ideally suited for operation in isoPower Devices, for details on board layout considerations. IN OUT electrically harsh environments or where RS-232 cables are The ADM3251E conforms to the EIA/TIA-232E and ITU-T V. 28 frequently being plugged and unplugged. specifications and operates at data rates up to 460 kbps. The ADM3251E incorporates dual-channel digital isolators Four external 0.1 F charge pump capacitors are used for the with isoPower integrated, isolated power. There is no requirement voltage doubler/inverter, permitting operation from a single to use a separate isolated dc-to-dc converter. Chip-scale trans- 5 V supply. former iCoupler technology from Analog Devices, Inc., is used The ADM3251E is available in a 20-lead, wide body SOIC package both for the isolation of the logic signals as well as for the inte- and is specified over the 40C to +85C temperature range. grated dc-to-dc converter. The result is a total isolation solution. The ADM3251E contains isoPower technology that uses high frequency switching elements to transfer power through the 1 Protected by U.S. Patents 5,952,849 6,873,065 and 7,075,329. Rev. G Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20082013 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 07388-001ADM3251E Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 11 Applications ....................................................................................... 1 Isolation of Power and Data ...................................................... 11 Functional Block Diagram .............................................................. 1 Charge Pump Voltage Converter ............................................. 12 General Description ......................................................................... 1 5.0 V Logic to EIA/TIA-232E Transmitter .............................. 12 Revision History ............................................................................... 2 EIA/TIA-232E to 5 V Logic Receiver ...................................... 12 Specifications ..................................................................................... 3 High Baud Rate ........................................................................... 12 Package Characteristics ............................................................... 5 Thermal Analysis ....................................................................... 12 Regulatory Information ............................................................... 5 Insulation Lifetime ..................................................................... 12 Insulation and Safety-Related Specifications ............................ 5 Applications Information .............................................................. 13 DIN EN 60747-5-2 (VDE 0884 TEIL 2): 2003-01 Insulation PCB Layout ................................................................................. 13 Characteristics .............................................................................. 6 Example PCB for Reduced EMI ............................................... 13 Absolute Maximum Ratings ............................................................ 7 DC Correctness and Magnetic Field Immunity ..................... 13 ESD Caution .................................................................................. 7 Isolated Power Supply Circuit .................................................. 14 Pin Configuration and Function Descriptions ............................. 8 Outline Dimensions ....................................................................... 15 Typical Performance Characteristics ............................................. 9 Ordering Guide .......................................................................... 15 REVISION HISTORY 10/13Rev. F to Rev. G Changes to Pollution Degree and Inputto-Output Test Voltage Added Patents Information, Note 1 ............................................... 1 Parameters, Table 6............................................................................ 6 Added Applications Information Section and Example PCB for Changed Minimum External Tracking (Creepage) Value to 7.6 mm, Table 5 ................................................................................. 5 Reduced EMI Section Added Table 9 and Table 10 Changes to Pin 9 Description and Pin 11 Descriptions, Table 8 ...... 8 Renumbered Sequentially ............................................................. 13 Changes to Isolation of Power and Data Section ....................... 11 Changes to PCB Layout Section ................................................... 13 Added Isolated Power Supply Circuit Section, and Figure 22 6/12Rev. E to Rev. F Renumbered Sequentially ............................................................. 14 Changes to Endnote 1 in Table 4 .................................................... 5 Added DC Correctness and Magnetic Field Immunity 1/10Rev. B to Rev. C Changes to Table 4 ............................................................................. 5 Section .............................................................................................. 13 Added Figure 22 and Figure 23 Renumbered Sequentially ..... 14 11/09Rev. A to Rev. B Updated Outline Dimensions and Changes to Changes to Figure 1 ........................................................................... 1 Ordering Guide ............................................................................... 15 Changed to Primary Side Supply Input Current, ICC(DISABLE) Maximum Limit to 2.5 mA .............................................................. 4 5/10Rev. D to Rev. E Changes to Table 4 ............................................................................. 5 Changes to Features Section............................................................ 1 Changes to Figure 13 ...................................................................... 11 Changes to Table 4 ............................................................................ 5 9/08Rev. 0 to Rev. A 3/10Rev. C to Rev. D Changes to Timing Parameters in Table 1 .................................... 3 Changes to Features and General Description Sections .............. 1 Changes to Timing Parameters in Table 2 .................................... 4 Changes to Table 4 and Table 5 ....................................................... 5 Changes to Ordering Guide .......................................................... 14 Changed DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Insulation Characteristics (Pending) Heading to DIN EN 7/08Revision 0: Initial Version 60747-5-2 (VDE 0884 Teil 2): 2003-01 Insulation Characteristics ................................................................................... 6 Rev. G Page 2 of 16