Half-Duplex, iCoupler Isolated RS-485 Transceiver Data Sheet ADM2483 FEATURES FUNCTIONAL BLOCK DIAGRAM V V DD1 DD2 RS-485 transceiver with electrical data isolation Complies with ANSI TIA/EIA RS-485-A and ISO 8482: 1987(E) ADM2483 500 kbps data rate DE Slew rate-limited driver outputs TxD Low power operation: 2.5 mA max Suitable for 5 V or 3 V operations (V ) DD1 PV High common-mode transient immunity: >25 kV/s A True fail-safe receiver inputs RxD B Chatter-free power-up/power-down protection RE 256 nodes on bus Thermal shutdown protection GND GND 1 2 Safety and regulatory approvals Figure 1. UL recognition: 2500 V rms for 1 minute per UL 1577 CSA Component Acceptance Notice 5A IEC 60950-1 800 V rms (basic), 400 V rms (reinforced) VDE Certificate of Conformity DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12 V = 560 V peak (reinforced) IORM V = 1500 V dc IORM(DC) CQC certification per GB4943.1-2011 Operating temperature range: 40C to +85C APPLICATIONS Low power RS-485/RS-422 networks Isolated interfaces Building control networks Multipoint data transmission systems GENERAL DESCRIPTION The ADM2483 differential bus transceiver is an integrated, When the driver is disabled or when VDD1 or VDD2 = 0 V, this galvanically isolated component designed for bidirectional data imposes minimal loading on the bus. An active-high receiver communication on balanced, multipoint bus transmission lines. disable feature, which causes the receive output to enter a high It complies with ANSI EIA/TIA-485-A and ISO 8482: 1987(E). impedance state, is provided as well. Using the iCoupler technology from Analog Devices, Inc., the The receiver inputs have a true fail-safe feature that ensures a ADM2483 combines a 3-channel isolator, a three-state differential logic-high receiver output level when the inputs are open or line driver, and a differential input receiver into a single package. shorted. This guarantees that the receiver outputs are in a The logic side of the device is powered with either a 5 V or 3 V known state before communication begins and at the point supply, and the bus side uses a 5 V supply only. when communication ends. The ADM2483 is slew-limited to reduce reflections with Current limiting and thermal shutdown features protect against improperly terminated transmission lines. The controlled slew output short circuits and bus contention situations that might rate limits the data rate to 500 kbps. The devices input impedance cause excessive power dissipation. The part is fully specified is 96 k, allowing up to 256 transceivers on the bus. Its driver over the industrial temperature range and is available in a has an active-high enable feature. The driver differential outputs 16-lead, wide body SOIC package. and receiver differential inputs are connected internally to form a differential input/output (I/O) port. Rev. F 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 20042018 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 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GALVANIC ISOLATION 04736-001ADM2483 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Switching Characteristics .............................................................. 10 Applications ....................................................................................... 1 Typical Performance Characteristics ........................................... 11 Functional Block Diagram .............................................................. 1 Circuit Description......................................................................... 14 General Description ......................................................................... 1 Electrical Isolation ...................................................................... 14 Revision History ............................................................................... 2 Truth Tables................................................................................. 15 Specifications ..................................................................................... 3 Power-Up/Power-Down Characteristics ................................. 15 Timing Specifications ....................................................................... 4 Thermal Shutdown .................................................................... 15 Absolute Maximum Ratings ............................................................ 5 True Fail-Safe Receiver Inputs .................................................. 15 ESD Caution .................................................................................. 5 Magnetic Field Immunity .......................................................... 15 Package Characteristics ............................................................... 6 Applications Information .............................................................. 17 Regulatory Information ............................................................... 6 Power Valid Input ..................................................................... 17 Insulation and Safety-Related Specifications ............................ 6 Isolated Power Supply Circuit .................................................. 17 DIN V VDE V 0884-10 Insulation Characteristics ................. 7 Outline Dimensions ....................................................................... 18 Pin Configuration and Function Descriptions ............................. 8 Ordering Guide .......................................................................... 18 Test Circuits ....................................................................................... 9 REVISION HISTORY 3/2018Rev. E to Rev. F 3/2005Rev. A to Rev. B Changes to Feature Section ............................................................. 1 Change to Features ............................................................................ 1 Change to Package Characteristics ................................................. 6 Changes to Table 4 ............................................................................ 5 Changes to Table 6 and Table 7 ....................................................... 6 Changes to Pin Function Descriptions ........................................... 8 Changes to DIN V VDE V 0884-10 Insulation Characteristics Changes to Figure 9 and Figure 11 ............................................... 10 Section and Table 8 ........................................................................... 7 Change to Power Valid Input Section ......................................... 17 Changes to Figure 30 ...................................................................... 17 9/2016Rev. D to Rev. E Changes to Ordering Guide .......................................................... 18 Added Table 4 Renumbered Sequentially .................................... 5 1/2005Rev. 0 to Rev. A Changes to ESD Maximum Rating Specification .......................... 5 7/2015Rev. C to Rev. D Change to Features Section ............................................................. 1 Changes to Table 5 and Table 6 ....................................................... 6 10/2004Revision 0: Initial Version Changes to Ordering Guide .......................................................... 18 11/2013Rev. B to Rev. C Changes to Features Section............................................................ 1 Changes to Table 5 ............................................................................ 6 Changes to VDE V 0884-10 Insulation Characteristics Section .... 7 Updated Outline Dimensions ....................................................... 18 Changes to Ordering Guide .......................................................... 18 Rev. F Page 2 of 18