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ADM2687EBRIZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
5 kV rms Signal and Power Isolated
RS-485 Transceiver with ±15 kV ESD Protection
Data Sheet
ADM2682E/ADM2687E
Rev. C 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.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2011–2015 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
FEATURES
5 kV rms 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)
Data rate: 16 Mbps (ADM2682E), 500 kbps (ADM2687E)
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
5000 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice #5A (pending)
IEC 60601-1: 400 V rms (basic), 250 V rms (reinforced)
IEC 60950-1: 600 V rms (basic), 380 V rms (reinforced)
VDE Certificates of Conformity
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
V
IORM
= 846 V peak
Operating temperature range: −40°C to +85°C
16-lead wide-body SOIC with >8 mm creepage and clearance
APPLICATIONS
Isolated RS-485/RS-422 interfaces
Industrial field networks
Multipoint data transmission systems
FUNCTIONAL BLOCK DIAGRAM
09927-001
ADM2682E/ADM2687E
TxD
A
B
Y
Z
DE
V
CC
V
CC
RxD
RE
GND
1
GND
2
DECODE D
R
DECODE
ENCODE
OSCILLATOR
RECTIFIER
REGULATOR
V
ISOOUT
isoPower DC-TO-DC CONVERTER
V
ISOIN
DIGITAL ISOLATION iCoupler
ENCODE
ENCODE
DECODE
TRANSCEIVER
ISOLATION
BARRIER
Figure 1.
GENERAL DESCRIPTION
The ADM2682E/ADM2687E are fully integrated 5 kV rms
signal and power isolated data transceivers with ±15 kV ESD
protection and are suitable for high speed communication on
multipoint transmission lines. The ADM2682E/ADM2687E
include an integrated 5 kV rms isolated dc-to-dc power supply
that 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 ADM2682E/ADM2687E drivers have 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, 16-lead, wide-
body SOIC package with >8 mm creepage and clearance.
The ADM2682E/ADM2687E 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
AN-0971 Application Note, Recommendations for Control of
Radiated Emissions with isoPower Devices, for details on board
layout considerations.
ADM2682E/ADM2687E Data Sheet
Rev. C | Page 2 of 24
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
ADM2682E Timing Specifications ............................................ 4
ADM2687E Timing Specifications ............................................ 4
Package Characteristics ............................................................... 4
Regulatory Information ............................................................... 5
Insulation and Safety-Related Specifications ............................ 5
VDE 0884-10 Insulation Characteristics ................................... 6
Absolute Maximum Ratings ............................................................ 7
ESD Caution .................................................................................. 7
Pin Configuration and Function Descriptions ............................. 8
Typical Performance Characteristics ............................................. 9
Test Circuits ..................................................................................... 14
Switching Characteristics .............................................................. 15
Circuit Description......................................................................... 16
Signal Isolation ........................................................................... 16
Power Isolation ........................................................................... 16
Truth Tables................................................................................. 16
Thermal Shutdown .................................................................... 16
Open- and Short-Circuit, Fail-Safe Receiver Inputs.............. 16
DC Correctness and Magnetic Field Immunity........................... 16
Applications Information .............................................................. 18
PCB Layout ................................................................................. 18
EMI Considerations ................................................................... 18
Insulation Lifetime ..................................................................... 19
Isolated Supply Considerations ................................................ 19
Typical Applications ................................................................... 20
Outline Dimensions ....................................................................... 22
Ordering Guide .......................................................................... 22
REVISION HISTORY
6/15—Rev. B to Rev. C
Changes to Figure 1 .......................................................................... 1
11/13—Rev. A to Rev. B
Change to Features Section ............................................................. 1
Change to Table 5 ............................................................................. 5
Changes to VDE 0884-10 Insulation Characteristics Section .... 6
6/13—Rev. 0 to Rev. A
Updated UL and VDE Certification (Throughout) ..................... 1
Updated Outline Dimensions ....................................................... 22
Changes to Ordering Guide .......................................................... 22
7/11—Revision 0: Initial Version
Data Sheet ADM2682E/ADM2687E
Rev. C | Page 3 of 24
SPECIFICATIONS
All voltages are relative to their respective ground; 3.0 ≤ V
CC
≤ 5.5 V. All minimum/maximum specifications apply over the entire
recommended operation range, unless otherwise noted. All typical specifications are at T
A
= 25°C, V
CC
= 5 V unless otherwise noted.
Table 1.
Parameter Symbol Min Typ Max Unit Test Conditions/Comments
ADM2687E SUPPLY CURRENT
I
CC
Data Rate ≤ 500 kbps 90 mA V
CC
= 3.3 V, 100 Ω load between Y and Z
72 mA V
CC
= 5 V, 100 Ω load between Y and Z
125 mA V
CC
= 3.3 V, 54 Ω load between Y and Z
98 mA V
CC
= 5 V, 54 Ω load between Y and Z
140
mA
120 Ω load between Y and Z
ADM2682E SUPPLY CURRENT I
CC
Data Rate = 16 Mbps 175 mA 120 Ω load between Y and Z
260 mA 54 Ω load between Y and Z
Data Rate = 16 Mbps, 4.5 ≤ V
CC
≤ 5.5 V 130 mA 120 Ω load between Y and Z
200 mA 54 Ω load between Y and Z
ISOLATED SUPPLY VOLTAGE
V
ISOOUT
V
DRIVER
Differential Outputs
Differential Output Voltage, Loaded |V
OD2
| 2.0 3.6 V R
L
= 100 Ω (RS-422), see Figure 29
1.5 3.6 V R
L
= 54 Ω (RS-485), see Figure 29
|V
OD3
| 1.5 3.6 V −7 V ≤ V
TEST1
≤ 12 V, see Figure 30
Δ|V
OD
| for Complementary Output States Δ|V
OD
| 0.2 V R
L
= 54 Ω or 100 Ω, see Figure 29
Common-Mode Output Voltage V
OC
3.0 V R
L
= 54 Ω or 100 Ω, see Figure 29
Δ|V
OC
| for Complementary Output States Δ|V
OC
| 0.2 V R
L
= 54 Ω or 100 Ω, see Figure 29
Short-Circuit Output Current I
OS
200 mA
Output Leakage Current (Y, Z) I
O
30 µA DE = 0 V,
RE
= 0 V, V
CC
= 0 V or 3.6 V,
V
IN
= 12 V
−30 µA DE = 0 V,
RE
= 0 V, V
CC
= 0 V or 3.6 V,
V
IN
= −7 V
Logic Inputs DE,
RE
, TxD
Input Threshold Low V
IL
0.27 V
CC
V DE,
RE
, TxD
Input Threshold High V
IH
0.7 V
CC
V DE,
RE
, TxD
Input Current I
I
−10 0.01 10 µA DE,
RE
, TxD
RECEIVER
Differential Inputs
Differential Input Threshold Voltage V
TH
−200 −125 −30 mV −7 V < V
CM
< +12 V
Input Voltage Hysteresis V
HYS
15 mV V
OC
= 0 V
Input Current (A, B)
I
I
125
µA
DE = 0 V, V
CC
= 0 V or 3.6 V, V
IN
= 12 V
−100 µA DE = 0 V, V
CC
= 0 V or 3.6 V, V
IN
= −7 V
Line Input Resistance R
IN
96 kΩ −7 V < V
CM
< +12 V
Logic Outputs
Output Voltage Low V
OL
0.2 0.4 V I
O
= 1.5 mA, V
A
− V
B
= −0.2 V
Output Voltage High V
OH
V
CC
− 0.3 V
CC
− 0.2 V I
O
= −1.5 mA, V
A
− V
B
= 0.2 V
Short-Circuit Current 100 mA
COMMON-MODE TRANSIENT IMMUNITY
1
25 kV/µs V
CM
= 1 kV, transient magnitude = 800 V
1
CM is the maximum common-mode voltage slew rate that can be sustained while maintaining specification-compliant operation. V
CM
is the common-mode potential
difference between the logic and bus sides. The transient magnitude is the range over which the common-mode is slewed. The common-mode voltage slew rates
apply to both rising and falling common-mode voltage edges.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

ADM2687EBRIZ

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Digital Isolators 500kbps 5kV RMS Sgnl & Pwr Iso Trnsceiver
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