adm2481 Analog Devices, Inc., adm2481 Datasheet
adm2481
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adm2481 Summary of contents
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... The logic side of the device is powered with either supply, and the bus side uses supply only. The ADM2481 is slew-limited to reduce reflections with improp- erly terminated transmission lines. The controlled slew rate limits the data rate to 500 kbps. The input impedance of the device is 96 kΩ ...
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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 and Safety-Related Specifications ............................ 4 VDE 0884 Insulation Characteristics (Pending) ...................... 5 Absolute Maximum Ratings ............................................................ 6 ESD Caution .................................................................................. 6 Pin Configuration and Function Descriptions ............................. 7 REVISION HISTORY 7/10— ...
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... DD1 V 0 ±1 I 2.5 DD1 1.3 I 2.0 DD2 1 Rev Page ADM2481 Unit Test Conditions/Comments ∞, see Figure Ω (RS-422), see Figure Ω (RS-485), see Figure − + ≥ 4.75, TEST DD1 see Figure 17 ...
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... In accordance with UL 1577, each ADM2481 is proof tested by applying an insulation test voltage of ≥ 3000 V rms for 1 second (current leakage detection limit = 5 μA). In accordance with DIN V VDE V 0884-10, each ADM2481 is proof tested by applying an insulation test voltage of ≥ 1050 V peak for 1 second (partial discharge detection limit = 5 pC). ...
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... Output Current Insulation Resistance 500 Symbol V IORM INPUT I S, OUTPUT R S Rev Page ADM2481 Characteristic Unit III 40/85/21 2 560 V PEAK 1050 V PEAK 896 V PEAK 672 V PEAK 4000 V PEAK 150 °C ...
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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 ESD Rating: Contact (Human Body Model) (A, B Pins) ...
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... Pin A is put into a high impedance state to avoid overloading the bus. Inverting Driver Output/Receiver Input. When the driver is disabled, or when V down, Pin B is put into a high impedance state to avoid overloading the bus. Power Supply (Bus Side). Rev Page DD1 ADM2481 DD1 DD2 powered DD2 ...
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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 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT VOLTAGE (V) Figure 4. Output Current vs. Driver Output Low Voltage –10 –30 –50 –70 –90 –110 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT VOLTAGE (V) Figure 5. Output Current vs. Driver Output High Voltage ...
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... CH1 5.00V CH3 1.00V Figure 11. Driver/Receiver Propagation Delay, High to Low CH1 5.00V CH3 1.00V Figure 12. Driver/Receiver Propagation Delay, Low to High Rev Page ADM2481 CH2 1.00V M200ns A CH1 3.10V T 1.33600µs CH4 5.00V CH2 1.00V M200ns A CH1 3.10V CH4 5.00V T 360 ...
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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 0.25 0.50 0.75 1.00 1.25 OUTPUT VOLTAGE (V) Figure 14. Output Current vs. Receiver Output Low Voltage ...
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... Figure 18. Driver Propagation Delay TEST Rev Page OUT DE IN Figure 19. Driver Enable/Disable OUT Figure 20. Receiver Propagation Delay +1. –1. OUT RE IN Figure 21. Receiver Enable/Disable ADM2481 ...
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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 Propagation Delay, Rise/Fall Timing A – PLH RxD 1. – SKEW PLH PHL Figure 23. Receiver Propagation Delay DD1 DE t PHL ...
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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 enable signals, applied to the TxD and DE pins, respectively, and referenced to logic ground ...
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... Z Z follows defines the conditions under which this might occur The 3 V operating condition of the ADM2481 is examined because it represents the most susceptible mode of operation. The limitation on the ac magnetic field immunity of the iCoupler is set by the condition in which the induced error Outputs ...
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... V to 0.75 V. This is well above the 0.5 V sensing threshold of the decoder. These magnetic flux density values are shown in Figure 28, using more familiar quantities such as maximum allowable current flow, at given distances away from the ADM2481 transformers. 1000.00 100.00 DISTANCE = 5mm 10 ...
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... Failure to ensure this can cause voltage differentials between pins that exceed the absolute maximum ratings of the device, thereby leading to latch-up or permanent damage. ISOLATED POWER SUPPLY CIRCUIT The ADM2481 requires isolated power capable 100 supplied between the V no suitable integrated power supply is available, a discrete V DD2 circuit, such as the one in Figure 30, can be used ...
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... Figure 31. 16-Lead Standard Small Outline Package [SOIC_W] Wide Body (RW-16) Dimensions shown in millimeters and (inches) Temperature Range Package Description −40°C to +85°C 16-Lead, Wide Body SOIC_W −40°C to +85°C 16-Lead, Wide Body SOIC_W Rev Page ADM2481 45° 1.27 (0.0500) 0.40 (0.0157) Package Option RW-16 RW-16 ...
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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 ...