Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsADM2587EBRWZ-REEL7

Signal and Power Isolated RS-485

Transceiver with ±15 kV ESD Protection

ADM2582E/ADM2587E

Rev. C

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FEATURES

Isolated RS-485/RS-422 transceiver, configurable as half or

full duplex

isoPower® integrated isolated dc-to-dc converter

±15 kV ESD protection on RS-485 input/output pins

Complies with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E)

ADM2582E data rate: 16 Mbps

ADM2587E data rate: 500 kbps

5 V or 3.3 V operation

Connect up to 256 nodes on one bus

Open- and short-circuit, fail-safe receiver inputs

High common-mode transient immunity: >25 kV/μs

Thermal shutdown protection

Safety and regulatory approvals

UL recognition: 2500 V rms for 1 minute per UL 1577

VDE Certificates of Conformity

DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01

IORM

= 560 V peak

Operating temperature range: −40°C to +85°C

Highly integrated, 20-lead, wide-body SOIC package

APPLICATIONS

Isolated RS-485/RS-422 interfaces

Industrial field networks

Multipoint data transmission systems

FUNCTIONAL BLOCK DIAGRAM

ADM2582E/ADM2587E

TxD

RxD

ISOLATION

BARRIER

TRANSCEIVER

GND

ENCODE

DECODE

DECODE D

DECODE

ENCODE

OSCILLATOR

RECTIFIER

REGULATOR

ISOOUT

DIGITAL ISOLATION iCoupler

isoPower DC-TO-DC CONVERTER

ISOIN

08111-001

Figure 1.

GENERAL DESCRIPTION

The ADM2582E/ADM2587E are fully integrated signal and

power isolated data transceivers with ±15 kV ESD protection

and are suitable for high speed communication on multipoint

transmission lines. The ADM2582E/ADM2587E include an

integrated isolated dc-to-dc power supply, which eliminates the

need for an external dc-to-dc isolation block.

They are designed for balanced transmission lines and comply

with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E).

The devices integrate Analog Devices, Inc., iCoupler® technology to

combine a 3-channel isolator, a three-state differential line driver, a

differential input receiver, and Analog Devices isoPower dc-to-

dc converter into a single package. The devices are powered by a

single 5 V or 3.3 V supply, realizing a fully integrated signal and

power isolated RS-485 solution.

The ADM2582E/ADM2587E driver has an active high enable.

An active low receiver enable is also provided, which causes the

receiver output to enter a high impedance state when disabled.

The devices have current limiting and thermal shutdown

features to protect against output short circuits and situations

where bus contention may cause excessive power dissipation.

The parts are fully specified over the industrial temperature

range and are available in a highly integrated, 20-lead, wide-

body SOIC package.

The ADM2582E/ADM2587E contain isoPower technology that

uses high frequency switching elements to transfer power through

the transformer. Special care must be taken during printed circuit

board (PCB) layout to meet emissions standards. Refer to

Application Note AN-0971, Control of Radiated Emissions with

isoPower Devices, for details on board layout considerations.

Summary of content (20 pages)

PAGE 1
Signal and Power Isolated RS-485 Transceiver with ±15 kV ESD Protection ADM2582E/ADM2587E FEATURES FUNCTIONAL BLOCK DIAGRAM VCC VISOOUT isoPower DC-TO-DC CONVERTER OSCILLATOR RECTIFIER VISOIN REGULATOR DIGITAL ISOLATION iCoupler TRANSCEIVER Y TxD ENCODE DECODE D Z DE ENCODE DECODE RxD DECODE ENCODE A R B ADM2582E/ADM2587E RE GND1 ISOLATION BARRIER GND2 08111-001 Isolated RS-485/RS-422 transceiver, configurable as half or full duplex isoPower® integrated isolated dc-to-dc converter ±1
PAGE 2
ADM2582E/ADM2587E TABLE OF CONTENTS Features .............................................................................................. 1 Switching Characteristics .............................................................. 13 Applications....................................................................................... 1 Circuit Description......................................................................... 14 Functional Block Diagram ...................................................
PAGE 3
ADM2582E/ADM2587E SPECIFICATIONS All voltages are relative to their respective ground; 3.0 ≤ VCC ≤ 5.5 V. All minimum/maximum specifications apply over the entire recommended operation range, unless otherwise noted. All typical specifications are at TA = 25°C, VCC = 5 V unless otherwise noted. Table 1.
PAGE 4
ADM2582E/ADM2587E ADM2582E TIMING SPECIFICATIONS TA = −40°C to +85°C. Table 2.
PAGE 5
ADM2582E/ADM2587E ADM2582E/ADM2587E REGULATORY INFORMATION Table 5. ADM2582E/ADM2587E Approvals Organization UL VDE Approval Type Recognized under the Component Recognition Program of Underwriters Laboratories, Inc. Certified according to DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01 Notes In accordance with UL 1577, each ADM2582E/ADM2587E is proof tested by applying an insulation test voltage ≥ 3000 V rms for 1 second.
PAGE 6
ADM2582E/ADM2587E ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. All voltages are relative to their respective ground. Table 8. Parameter VCC Digital Input Voltage (DE, RE, TxD) Digital Output Voltage (RxD) Driver Output/Receiver Input Voltage Operating Temperature Range Storage Temperature Range ESD (Human Body Model) on A, B, Y, and Z pins ESD (Human Body Model) on Other Pins Thermal Resistance θJA Lead Temperature Soldering (10 sec) Vapor Phase (60 sec) Infrared (15 sec) Rating −0.
PAGE 7
ADM2582E/ADM2587E PIN CONFIGURATION AND FUNCTION DESCRIPTIONS GND1 1 20 GND2 VCC 2 19 VISOIN GND1 3 18 A 17 B RE 5 DE 6 TxD 7 ADM2582E ADM2587E 16 GND2 TOP VIEW (Not to Scale) 15 Z 14 GND2 VCC 8 13 Y GND1 9 12 VISOOUT GND1 10 11 GND2 NOTES 1. PIN 12 AND PIN 19 MUST BE CONNECTED EXTERNALLY. 08111-002 RxD 4 Figure 2. Pin Configuration Table 10. Pin Function Description Pin No.
PAGE 8
ADM2582E/ADM2587E TYPICAL PERFORMANCE CHARACTERISTICS 180 140 120 RL = 54Ω 140 SUPPLY CURRENT, ICC (mA) 120 RL = 120Ω 100 80 NO LOAD 60 40 100 80 60 40 NO LOAD 10 35 TEMPERATURE (°C) 60 85 0 –40 08111-103 –15 Figure 3. ADM2582E Supply Current (ICC) vs. Temperature (Data Rate = 16 Mbps, DE = 3.3 V, VCC = 3.3 V) –15 10 35 TEMPERATURE (°C) 60 85 Figure 6. ADM2587E Supply Current (ICC) vs. Temperature (Data Rate = 500 kbps, DE = 3.3 V, VCC = 3.
PAGE 9
ADM2582E/ADM2587E 60 TxD OUTPUT CURRENT (mA) 50 1 Z Y 40 30 20 CH2 2.0V M10.00ns A CH1 1.28V 0 08111-109 CH1 2.0V CH3 2.0V Figure 9. ADM2582E Driver Propagation Delay 0 1 2 3 OUTPUT VOLTAGE (V) 4 5 08111-112 10 3 Figure 12. Receiver Output Current vs. Receiver Output Low Voltage 4.75 4.74 OUTPUT VOLTAGE(V) 4.73 TxD 1 Z Y 4.72 4.71 4.70 4.69 4.68 4.67 3 M200ns A CH1 2.56V 4.65 –40 Figure 10. ADM2587E Driver Propagation Delay 10 35 TEMPERATURE (°C) 60 85 85 Figure 13.
PAGE 10
ADM2582E/ADM2587E B A 1 RxD 3 CH2 2.0V M10.00ns A CH1 2.56V 98 97 96 tRPHL 95 94 93 92 tRPLH 91 90 –40 08111-115 CH1 2.0V CH3 2.0V 99 –15 10 35 TEMPERATURE (°C) 60 85 08111-118 RECEIVER PROPAGATION DELAY (ns) 100 Figure 18. ADM2587E Receiver Propagation Delay vs. Temperature Figure 15. ADM2582E Receiver Propagation Delay 3.33 ISOLATED SUPPLY VOLTAGE (V) A B 1 RxD A CH1 2.56V 3.29 NO LOAD RL = 120Ω RL = 54Ω 3.28 3.26 –40 –15 10 35 TEMPERATURE (°C) 60 85 Figure 19.
PAGE 11
ADM2582E/ADM2587E 40 RL = 54Ω 40 ISOLATED SUPPLY CURRENT (mA) 50 RL = 120Ω 30 NO LOAD 20 10 30 RL = 120Ω 25 20 15 10 NO LOAD 5 –15 10 35 TEMPERATURE (°C) 60 85 Figure 21. ADM2582E Isolated Supply Current vs. Temperature (VCC = 3.3 V, Data Rate = 16 Mbps) 0 –40 –15 10 35 TEMPERATURE (°C) 60 85 Figure 22. ADM2587E Isolated Supply Current vs. Temperature (VCC = 3.3 V, Data Rate = 500 kbps) Rev.
PAGE 12
ADM2582E/ADM2587E TEST CIRCUITS RL 2 VOD2 RL 2 VOUT Y VOC TxD 08111-003 Z S1 Figure 23. Driver Voltage Measurement Y Figure 26. Driver Enable/Disable 375Ω A 60Ω VTEST B Figure 24. Driver Voltage Measurement Y TxD CL Figure 27. Receiver Propagation Delay CL +1.5V CL –1.5V VCC S1 RL 08111-005 Z VOUT RE RL RE S2 CL VOUT RE IN Figure 25. Driver Propagation Delay Figure 28. Receiver Enable/Disable Rev.
PAGE 13
ADM2582E/ADM2587E SWITCHING CHARACTERISTICS VCC VCC/2 VCC/2 0V tDPLH tDPHL VCC Z VO 1/2VO DE tLZ 2.3V Y, Z 90% POINT VDIFF VOL + 0.5V 90% POINT VDIFF = V(Y) – V(Z) VOL tZH 10% POINT tDF tDR tHZ 2.3V VOH VOH – 0.5V Y, Z 08111-011 10% POINT 08111-009 –VO 0.5VCC 0V tZL Y +VO 0.5VCC tSKEW = │tDPHL – tDPLH │ Figure 31. Driver Enable/Disable Timing Figure 29. Driver Propagation Delay, Rise/Fall Timing 0.7VCC RE 0.3VCC 0V 0V tRPLH tRPHL tZL tLZ 1.5V RO VOH VOL + 0.
PAGE 14
ADM2582E/ADM2587E CIRCUIT DESCRIPTION SIGNAL ISOLATION Table 13. Receiving (see Table 11 for Abbreviations) The ADM2582E/ADM2587E signal isolation is implemented on the logic side of the interface. The part achieves signal isolation by having a digital isolation section and a transceiver section (see Figure 1). Data applied to the TxD and DE pins and referenced to logic ground (GND1) are coupled across an isolation barrier to appear at the transceiver section referenced to isolated ground (GND2).
PAGE 15
ADM2582E/ADM2587E unpowered or nonfunctional, in which case, the isolator output is forced to a default state by the watchdog timer circuit. This situation should occur in the ADM2582E/ADM2587E devices only during power-up and power-down operations. The limitation on the ADM2582E/ADM2587E magnetic field immunity is set by the condition in which induced voltage in the transformer receiving coil is sufficiently large to either falsely set or reset the decoder.
PAGE 16
ADM2582E/ADM2587E APPLICATIONS INFORMATION PCB LAYOUT The ADM2582E/ADM2587E isolated RS-422/RS-485 transceiver contains an isoPower integrated dc-to-dc converter, requiring no external interface circuitry for the logic interfaces. Power supply bypassing is required at the input and output supply pins (see Figure 35). The power supply section of the ADM2582E/ ADM2587E uses an 180 MHz oscillator frequency to pass power efficiently through its chip-scale transformers.
PAGE 17
ADM2582E/ADM2587E In the case of unipolar ac or dc voltage, the stress on the insulation is significantly lower. This allows operation at higher working voltages while still achieving a 50-year service life. The working voltages listed in Table 9 can be applied while maintaining the 50-year minimum lifetime, provided the voltage conforms to either the unipolar ac or dc voltage cases.
PAGE 18
ADM2582E/ADM2587E TYPICAL APPLICATIONS Figure 41 and Figure 42 show typical applications of the ADM2582E/ADM2587E in half duplex and full duplex RS-485 network configurations. Up to 256 transceivers can be connected to the RS-485 bus. To minimize reflections, terminate the line at the receiving end in its characteristic impedance and keep stub lengths off the main line as short as possible.
PAGE 19
ADM2582E/ADM2587E MAXIMUM NUMBER OF TRANSCEIVERS ON BUS = 256 ADM2582E/ ADM2587E RxD R A A B B RE RE Z D RxD R RT RT DE TxD ADM2582E/ ADM2587E DE Z Y D Y A B ADM2582E/ ADM2587E R Z Y A D RxD RE B ADM2582E/ ADM2587E DE TxD R Z TxD Y D RxD RE DE TxD 08111-027 NOTES 1. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE. 2. ISOLATION NOT SHOWN. Figure 41.
PAGE 20
ADM2582E/ADM2587E OUTLINE DIMENSIONS 13.00 (0.5118) 12.60 (0.4961) 11 20 7.60 (0.2992) 7.40 (0.2913) 10 2.65 (0.1043) 2.35 (0.0925) 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 10.65 (0.4193) 10.00 (0.3937) 1.27 (0.0500) BSC 0.51 (0.0201) 0.31 (0.0122) SEATING PLANE 0.75 (0.0295) 45° 0.25 (0.0098) 8° 0° 0.33 (0.0130) 0.20 (0.