adm2491e Analog Devices, Inc., adm2491e Datasheet
adm2491e
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adm2491e Summary of contents
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... Industrial field networks INTERBUS Multipoint data transmission systems GENERAL DESCRIPTION The ADM2491E is an isolated data transceiver with ±8 kV ESD protection and is suitable for high speed, half- or full-duplex communication on multipoint transmission lines. For half- duplex operation, the transmitter outputs and the receiver inputs share the same transmission line ...
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... ADM2491E TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Timing Specifications .................................................................. 4 Package Characteristics ............................................................... 4 Regulatory Information (Pending) ............................................ 4 Insulation and Safety-Related Specifications............................ 5 VDE 0884 Insulation Characteristics (Pending)...................... 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configuration and Functional Descriptions.......................... 7 Test Circuits....................................................................................... 8 REVISION HISTORY 10/07— ...
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... − kΩ 1.5 mA, V − V ORxD −1.5 mA, V − V ORxD A mA μ 5 < V DD1 OUT kV/μ kV, transient magnitude = 800 the common-mode potential CM ADM2491E = V = DD1 DD2 = − −0 0 < V DD1 ...
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... V rms isolation voltage 1 In accordance with UL 1577, each ADM2491E is proof tested by applying an insulation test voltage ≥ 6000 V rms for 1 second (current leakage detection limit = 10 μA accordance with DIN V VDE V 0884-10, each ADM2491E is proof tested by applying an insulation test voltage ≥ 1590 V peak for 1 second (partial discharge detection limit = 5 pC) ...
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... V IIIa = 1 sec, Partial Discharge < sec) TR Rev Page ADM2491E Conditions 1 minute duration Measured from input terminals to output terminals, shortest distance through air Measured from input terminals to output terminals, shortest distance along body Insulation distance through insulation DIN IEC 112/VDE 0303 Part 1 ...
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... ADM2491E ABSOLUTE MAXIMUM RATINGS °C, unless otherwise noted. Each voltage is relative to its A respective ground. Table 7. Parameter Storage Temperature Ambient Operating Temperature V DD1 V DD2 Logic Input Voltages Bus Terminal Voltages Logic Output Voltages Average Output Current, per Pin ESD (Human Body Model ...
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... RxD ADM2491E TOP VIEW (Not to Scale TxD GND GND CONNECT Figure 2. ADM2491E Pin Configuration required; capacitor value should be between 1 required; capacitor value should be between 2 Rev Page ADM2491E ...
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... ADM2491E TEST CIRCUITS V OD Figure 3. Driver Voltage Measurement 375Ω V 60Ω OD 375Ω Figure 4. Driver Voltage Measurement V DD1 V DD2 ADM2491E DE TxD RxD RE GND GND 1 2 Figure 5. Supply Current Measurement Test Circuit TEST Y R TERMINATION Rev Page ...
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... Figure 11. Driver Enable/Disable Delay 1. PHL | RxD 90% POINT 10% POINT DD1 RE DD1 0V RxD – 0.5V OH RxD 0V 0V Rev Page ADM2491E PLH PHL 1.5V 1.5V Figure 12. Receiver Propagation Delay 0.5V 0.5V DD1 DD1 1. 0.5V OL OUTPUT LOW OUTPUT HIGH V – 0. ...
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... ADM2491E TYPICAL PERFORMANCE CHARACTERISTICS 2.58 NO LOAD 2.56 2.54 2.52 100Ω LOAD 2.50 2.48 54Ω LOAD 2.46 2.44 2.42 –40 – TEMPERATURE (°C) Figure 14. I Supply Current vs. Temperature DD1 60 50 54Ω LOAD 40 100Ω LOAD LOAD 10 0 –40 – TEMPERATURE (°C) Figure 15. I Supply Current vs. Temperature DD2 ...
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... Figure 22. Output Current vs. Receiver Output Low Voltage 4.76 4.75 4.74 4.73 4.72 4.71 4.70 4.69 4.68 4.67 4.66 4.65 150 200 –40 Figure 23. Receiver Output High Voltage vs. Temperature, 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 4.8 5.0 –40 Figure 24. Receiver Output Low Voltage vs. Temperature, 1.0 1.2 Rev Page ADM2491E – TEMPERATURE (° −4 mA RxD – TEMPERATURE (° –4 mA RxD ...
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... ADM2491E CIRCUIT DESCRIPTION ELECTRICAL ISOLATION In the ADM2491E, electrical isolation is implemented on the logic side of the interface. Therefore, the part has two main sections: a digital isolation section and a transceiver section (see Figure 25). The driver input signal, which is applied to the TxD pin and referenced to logic ground (GND ...
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... Therefore, iCoupler devices have essentially infinite dc field immunity. The following analysis defines the conditions under which this may occur. The 3 V operating condition of the ADM2491E is examined because it represents the most susceptible mode of operation. The limitation on the ac magnetic field immunity of the ...
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... ADM2491E APPLICATIONS INFORMATION ISOLATED POWER SUPPLY CIRCUIT The ADM2491E requires isolated power capable approximately 75 mA (this current is dependant on the data rate and termination resistors used supplied between the V and the GND pins. A transformer driver circuit with a DD2 ...
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... T 2. ISOLATION NOT SHOWN. Figure 30. ADM2491E Typical Half-Duplex RS-485 Network MAXIMUM NUMBER OF NODES = RxD RE DE TxD RxD Figure 31. ADM2491E Typical Full -Duplex RS-485 Network Rev Page ADM2491E TxD SLAVE ...
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... REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. ORDERING GUIDE Model Temperature Range ADM2491EBRWZ 1 −40°C to +85°C 1 ADM2491EBRWZ–REEL7 −40°C to +85° RoHS Compliant Part. ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06985-0-10/07(0) 10.50 (0.4134) 10 ...