PDF ADM2484E Data sheet ( Hoja de datos )

Número de pieza	ADM2484E
Descripción	Isolated RS-485 Transceiver
Fabricantes	Analog Devices
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Data Sheet 500 kbps, ESD Protected, Half-/Full-Duplex, iCoupler, Isolated RS-485 Transceiver ADM2484E FEATURES Isolated, RS-485/RS-422 transceiver, configurable as half- or full-duplex ±15 kV ESD protection on RS-485 input/output pins 500 kbps data rate Complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E) Suitable for 5 V or 3.3 V operation (VDD1) High common-mode transient immunity: >25 kV/μs True fail-safe receiver inputs 256 nodes on the bus Thermal shutdown protection Safety and regulatory approvals UL recognition 5000 V rms isolation voltage for 1 minute per UL1577 VDE certificate of conformity DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12 Reinforced insulation, VIORM = 849 VPEAK CSA Component Acceptance Notice 5A IEC 60950-1: 380 V rms (reinforced) Operating temperature range: −40°C to +85°C Wide body, 16-lead SOIC package APPLICATIONS Isolated RS-485/RS-422 interfaces Industrial field networks INTERBUS Multipoint data transmission systems GENERAL DESCRIPTION The ADM2484E is an isolated data transceiver with ±15 kV ESD protection suitable for high speed, half- or full-duplex communication on multipoint transmission lines. For half- duplex operation, the transmitter outputs and receiver inputs share the same transmission line. Transmitter Output Pin Y links externally to Receiver Input Pin A, and Transmitter Output Pin Z links externally to Receiver Input Pin B. Designed for balanced transmission lines, the ADM2484E complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E). The device employs Analog Devices, Inc., iCoupler® technology to combine a 3-channel isolator, a three-state differential line driver, and a differential input receiver into a single package. FUNCTIONAL BLOCK DIAGRAM VDD1 VDD2 ADM2484E DE TxD RxD RE GND1 Figure 1. GND2 Y Z A B The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection up to ±15 kV using the human body model (HBM). The logic side of the device can be powered with either a 5 V or a 3.3 V supply, whereas the bus side requires an isolated 3.3 V supply. The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention causes excessive power dissipation. 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 rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2008–2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com 1 page ADM2484E TIMING SPECIFICATIONS TA = −40°C to +85°C. Table 2. Parameter DRIVER Propagation Delay Differential Driver Output Skew (tDPLH − tDPHL) Rise Time/Fall Time Enable Time Disable Time RECEIVER Propagation Delay Pulse Width Distortion, PWD = \|tPLH − tPHL\| Enable Time Disable Time Data Sheet Symbol Min Typ Max Unit Test Conditions tDPLH, tDPHL tDSKEW 250 700 ns 100 ns tDR, tDF tZL, tZH tLZ, tHZ 200 450 1100 ns 1.5 µs 200 ns RL = 54 Ω, CL1 = CL2 = 100 pF, see Figure 16 and Figure 21 RL = 54 Ω, CL1 = CL2 = 100 pF, see Figure 16 and Figure 21 RL = 54 Ω, CL1 = CL2 = 100 pF, see Figure 16 and Figure 21 RL = 110 Ω, CL = 50 pF, see Figure 18 and Figure 22 RL = 110 Ω, CL = 50 pF, see Figure 18 and Figure 22 tPLH, tPHL tPWD tZL, tZH tLZ, tHZ 200 ns 30 ns 13 ns 13 ns CL = 15 pF, see Figure 17 and Figure 23 CL = 15 pF, see Figure 17 and Figure 23 RL = 1 kΩ, CL = 15 pF, see Figure 19 and Figure 24 RL = 1 kΩ, CL = 15 pF, see Figure 19 and Figure 24 PACKAGE CHARACTERISTICS Table 3. Parameter RESISTANCE Resistance (Input-to-Output)1 CAPACITANCE Capacitance (Input-to-Output)1 Input Capacitance2 THERMAL RESISTANCE Input IC Junction-to-Case Output IC Junction-to-Case Symbol RI-O CI-O CI θJCI θJCO Min Typ Max Unit Test Conditions 1012 Ω 3 pF f = 1 MHz 4 pF 33 °C/W Thermocouple located at center of package underside 28 °C/W 1 Device considered a 2-terminal device: Pin 1 to Pin 8 are shorted together and Pin 9 to Pin16 are shorted together. 2 Input capacitance is from any input data pin to ground. REGULATORY INFORMATION Table 4. UL1 1577 Component Recognition Program 5000 V rms Isolation Voltage CSA Approved under CSA Component Acceptance Notice 5A Reinforced insulation per CSA 60950-1-03 and IEC 60950-1, 380 V rms (537 VPEAK) maximum working voltage VDE2 Certified according to DIN V VDE V 0884-10 (VDE V 0884-10): 2006-122 Reinforced insulation, 849 VPEAK 1 In accordance with UL1577, each ADM2484E is proof tested by applying an insulation test voltage ≥ 6000 V rms for 1 second (current leakage detection limit = 10 µA). 2 In accordance with DIN V VDE V 0884-10, each ADM2484E is proof tested by applying an insulation test voltage ≥ 1590 VPEAK for 1 second (partial discharge detection limit = 5 pC). Rev. F \| Page 4 of 16 5 Page ADM2484E TEST CIRCUITS VOD RL 2 RL 2 VOC Figure 14. Driver Voltage Measurement 375Ω VOD 60Ω VTEST 375Ω Figure 15. Driver Voltage Measurement Data Sheet A VOUT B CL Figure 17. Receiver Propagation Delay 0V OR 3V DE Y S1 Z VOUT RL CL VCC S2 Figure 18. Driver Enable/Disable Y CL1 RL Z CL2 Figure 16. Driver Propagation Delay +1.5V –1.5V S1 RE IN RL RE CL VOUT Figure 19. Receiver Enable/Disable VCC S2 VDD1 DE VDD2 VDD2 Y TxD Z 120Ω RxD RE A B GND1 GND2 Figure 20. Supply Current Measurement Test Circuit Rev. F \| Page 10 of 16 11 Page

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