ADM2486BRW Analog Devices Inc, ADM2486BRW Datasheet
ADM2486BRW
Specifications of ADM2486BRW
Available stocks
Related parts for ADM2486BRW
ADM2486BRW Summary of contents
Page 1
FEATURES Half-duplex, isolated RS-485 transceiver PROFIBUS® compliant ANSI EIA/TIA 485-A and ISO 8482: 1987(E) compliant 20 Mbps data rate operation (V ) DD1 High common-mode transient immunity: >25 kV/μs Isolated DE status output Receiver open-circuit, ...
Page 2
ADM2486 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Timing Specifications....................................................................... 5 ADM2486 Characteristics ............................................................... 6 Package Characteristics ............................................................... 6 Regulatory Information............................................................... 6 Insulation and ...
Page 3
SPECIFICATIONS 2.7 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, ...
Page 4
ADM2486 Parameter COMMON-MODE TRANSIENT IMMUNITY HIGH FREQUENCY, COMMON-MODE NOISE IMMUNITY 1 Common-mode transient immunity is the maximum common-mode voltage slew rate that can be sustained while maintaining specification-compliant operation the common-mode potential difference between the logic and bus ...
Page 5
TIMING SPECIFICATIONS 2.7 V ≤ V ≤ 5.5 V, 4.75 V ≤ V ≤ 5. DD1 DD2 Table 2. Parameter DRIVER Maximum Data Rate Propagation Delay PLH PHL RTS-to-DE Propagation Delay Pulse Width Distortion, t ...
Page 6
ADM2486 ADM2486 CHARACTERISTICS PACKAGE CHARACTERISTICS Table 3. Parameter Resistance (Input-to-Output Capacitance (Input-to-Output) 2 Input Capacitance Input IC Junction-to-Case Thermal Resistance Output IC Junction-to-Case Thermal Resistance 1 Device considered a 2-terminal device: Pin 1 through Pin 8 shorted together, ...
Page 7
VDE 0884 INSULATION CHARACTERISTICS This isolator is suitable for basic electrical isolation only within the safety limit data. Maintenance of the safety data must be ensured by means of protective circuits. An asterisk (*) on the physical package denotes VDE ...
Page 8
ADM2486 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 (RTS, RE, TxD) Digital Output Voltage RxD DE Driver Output/Receiver Input ...
Page 9
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 8. Pin Function Descriptions Pin No. Mnemonic Description 1 V Power Supply (Logic Side Supply. Decoupling capacitor to GND DD1 between 0.01 μF and 0.1 μ GND ...
Page 10
ADM2486 TEST CIRCUITS V OD Figure 3. Driver Voltage Measurement 375Ω V 60Ω OD3 375Ω Figure 4. Driver Voltage Measurement RTS TxD RxD RE V GND V DD1 1 DD2 Figure 5. Supply-Current Measurement Test Circuit RTS TxD B V ...
Page 11
SWITCHING CHARACTERISTICS V DD1 0.5V DD1 0V t PALH t PBLH B 1/2VO SKEW – t PWD PALH 90% POINT 10% POINT Figure 12. Driver Propagation ...
Page 12
ADM2486 TYPICAL PERFORMANCE CHARACTERISTICS 1.4 1.2 I _RCVR_ENABLE @ 5.5V DD1 1.0 I _DE_ENABLE @ 5.5V DD2 0.8 0.6 0.4 0 –40 TEMPERATURE (°C) Figure 16. Unloaded Supply Current vs. Temperature 50 t RECEIVER PLH 45 t RECEIVER ...
Page 13
OUTPUT VOLTAGE (V) Figure 22. Output Current vs. Receiver Output High Voltage 0.25 0.50 0.75 1.00 ...
Page 14
ADM2486 CIRCUIT DESCRIPTION ELECTRICAL ISOLATION In the ADM2486, 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 ...
Page 15
THERMAL SHUTDOWN The ADM2486 contains thermal shutdown circuitry that protects the part from excessive power dissipation during fault conditions. Shorting the driver outputs to a low impedance source can result in high driver currents. The thermal sensing circuitry detects the ...
Page 16
ADM2486 APPLICATIONS INFORMATION PC BOARD LAYOUT The ADM2486 isolated RS-485 transceiver requires no external interface circuitry for the logic interfaces. Power supply bypassing is strongly recommended at the input and output supply pins (see Figure 29). Bypass capacitors are most ...
Page 17
ISOLATED POWER SUPPLY CIRCUIT The ADM2486 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 ...
Page 18
... ADM2486 OUTLINE DIMENSIONS 0.30 (0.0118) 0.10 (0.0039) COPLANARITY ORDERING GUIDE Model Data Rate (Mbps) ADM2486BRW 20 ADM2486BRW-REEL 20 1 ADM2486BRWZ 20 1 ADM2486BRWZ-REEL Pb-free part. 10.50 (0.4134) 10.10 (0.3976 7.60 (0.2992) 7.40 (0.2913) 10.65 (0.4193 10.00 (0.3937) 1.27 (0.0500) 2.65 (0.1043) BSC 2.35 (0.0925) ...
Page 19
NOTES Rev Page ADM2486 ...
Page 20
ADM2486 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04604-0-2/06(D) T Rev Page ...