ADM2481BRWZ Analog Devices Inc, ADM2481BRWZ Datasheet
ADM2481BRWZ
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ADM2481BRWZ Summary of contents
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FEATURES RS-485 transceiver with electrical data isolation Complies with ANSI TIA/EIA-485-A and ISO 8482: 1987(E) 500 kbps data rate Slew rate-limited driver outputs Low power operation: 2.5 mA maximum Suitable for 3.3 V operations (V High common-mode ...
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ADM2481 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 ...
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SPECIFICATIONS 3.0 V ≤ V ≤ 5.5 V, 4.75 V ≤ V ≤ 5. DD1 DD2 Table 1. Parameter DRIVER Differential Outputs Differential Output Voltage Δ for Complementary Output States OD Common-Mode Output Voltage Δ |V ...
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ADM2481 TIMING SPECIFICATIONS 3.0 V ≤ V ≤ 5.5 V, 4.75 V ≤ V ≤ 5. DD1 DD2 Table 2. Parameter Symbol DRIVER Maximum Data Rate Propagation Delay PLH PHL Skew t SKEW Rise/Fall Time ...
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VDE 0884 INSULATION CHARACTERISTICS (PENDING) This isolator is suitable for basic electrical isolation only within this safety limit data. Maintenance of this safety data shall be ensured by means of protective circuits. Table 6. Description Installation Classification per DIN VDE ...
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ADM2481 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. All voltages are relative to A their respective ground. Table 7. Parameter V DD1 V DD2 Digital Input Voltage (DE, RE, TxD) Digital Output Voltage (RxD) Driver Output/Receiver Input Voltage ...
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PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 8. Pin Function Descriptions Pin No. Mnemonic 1 V DD1 GND 1 3 RxD TxD 9, 10, 15 GND 2 11 ...
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ADM2481 TYPICAL PERFORMANCE CHARACTERISTICS 1.6 I _RCVR_ENABLE @ 5.5V DD1 1.4 1.2 1.0 0.8 I _DE_ENABLE @ 5.5V DD2 0.6 0.4 0.2 0 –40 25 TEMPERATURE (°C) Figure 3. Unloaded Supply Current vs. Temperature 120 100 ...
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PLHA t PHLA t PLHB 200 t PHLB 100 0 –40 – TEMPERATURE (°C) Figure 9. Driver Propagation Delay vs. Temperature 800 700 t PHL 600 t PLH 500 400 300 200 100 ...
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ADM2481 350 300 250 BUS SIDE 200 150 LOGIC SIDE 100 100 CASE TEMPERATURE (°C) Figure 13. Thermal Derating Curve, Dependence of Safety-Limiting Values with Case Temperature per VDE 0884 ...
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TEST CIRCUITS Figure 16. Driver Voltage Measurement 375Ω V 60Ω OD3 375Ω Figure 17. Driver Voltage Measurement over Common-Mode Range Figure 18. Driver Propagation Delay TEST C ...
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ADM2481 SWITCHING CHARACTERISTICS V DD1 0.5V 0.5V DD1 0V t PLH B 1/ – SKEW PLH V OH 90% POINT A, B 10% POINT Figure 22. Driver ...
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CIRCUIT DESCRIPTION ELECTRICAL ISOLATION In the ADM2481, 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 26). Driver input and data ...
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ADM2481 TRUTH TABLES The following truth tables use the abbreviations shown in Table 9. Table 9. Letter Description H High level L Low level X Don’t care Z High impedance (off ) NC Disconnected Table 10. Transmitting Supply Status Inputs ...
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Given the geometry of the receiving coil and an imposed requirement that the induced voltage is, at most, 50% of the 0.5 V margin at the decoder, a maximum allowable magnetic field is calculated, as shown in Figure 27. 100.000 ...
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ADM2481 APPLICATIONS INFORMATION PRINTED CIRCUIT BOARD (PCB) LAYOUT The ADM2481 signal isolated RS-485 transceiver requires no external interface circuitry for the logic interfaces. Power supply bypassing is required at the input and output supply pins (see Figure 29). Bypass capacitors ...
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... CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. ORDERING GUIDE 1 Model Data Rate (kbps) ADM2481BRWZ 500 ADM2481BRWZ-RL7 500 RoHS Compliant Part. 10.50 (0.4134) 10.10 (0.3976 7.60 (0.2992) 7.40 (0.2913 ...
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ADM2481 NOTES Rev Page ...
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NOTES Rev Page ADM2481 ...
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ADM2481 NOTES ©2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D08920-0-7/10(0) Rev Page ...