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ADM2682E Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM2682E
Beschreibung (ADM2682E / ADM2687E) 5 kV rms Signal & Power Isolated RS-485 Transceiver
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 24 Seiten
ADM2682E Datasheet, Funktion
Data Sheet
5 kV rms Signal and Power Isolated
RS-485 Transceiver with ±15 kV ESD Protection
ADM2682E/ADM2687E
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
VIORM = 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
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.
Rev. C
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
FUNCTIONAL BLOCK DIAGRAM
VCC
VISOOUT
isoPower DC-TO-DC CONVERTER
OSCILLATOR
RECTIFIER
VCC
DIGITAL ISOLATION iCoupler
TxD ENCODE
REGULATOR
VISOIN
DECODE
TRANSCEIVER
D
Y
Z
DE ENCODE
DECODE
RxD
DECODE
ENCODE
A
R
B
RE ADM2682E/ADM2687E
GND1
ISOLATION
BARRIER
Figure 1.
GND2
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.
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






ADM2682E Datasheet, Funktion
ADM2682E/ADM2687E
Data Sheet
VDE 0884-10 INSULATION CHARACTERISTICS
This isolator is suitable for reinforced electrical isolation only within the safety limit data. Maintenance of the safety data must be ensured
by means of protective circuits.
Table 7.
Description
CLASSIFICATIONS
Installation Classification per DIN VDE 0110 for
Rated Mains Voltage
≤300 V rms
≤450 V rms
≤600 V rms
Climatic Classification
Pollution Degree
VOLTAGE
Maximum Working Insulation Voltage
Input-to-Output Test Voltage
Method b1
Method a
After Environmental Tests, Subgroup 1
After Input and/or Safety Test,
Subgroup 2/Subgroup 3
Highest Allowable Overvoltage
SAFETY-LIMITING VALUES
Case Temperature
Input Current
Output Current
Insulation Resistance at TS
Test Conditions/Comments
Table 1 of DIN VDE 0110
VIORM × 1.875 = VPR, 100% production tested,
tm = 1 sec, partial discharge < 5 pC
VIORM × 1.6 = VPR, tm = 60 sec, partial discharge < 5 pC
VIORM × 1.2 = VPR, tm = 60 sec, partial discharge < 5 pC
Transient overvoltage, tTR = 10 sec
Maximum value allowed in the event of a failure
VIO = 500 V
Symbol
VIORM
VPR
VTR
TS
IS, INPUT
IS, OUTPUT
RS
Characteristic
I to IV
I to III
I to II
40/85/21
2
846
1590
1375
1018
6000
150
265
335
>109
Unit
V peak
V peak
V peak
V peak
V peak
°C
mA
mA
Rev. C | Page 6 of 24

6 Page









ADM2682E pdf, datenblatt
ADM2682E/ADM2687E
98
97
96
tRPHL
95
tRPLH
94
93
92
–40
–15 10 35 60
TEMPERATURE (°C)
85
Figure 21. ADM2682E Receiver Propagation Delay vs. Temperature
100
99
98
97
96
95
94
93
92
91
90
–40
tRPHL
tRPLH
–15 10 35 60
TEMPERATURE (°C)
85
Figure 22. ADM2687E Receiver Propagation Delay vs. Temperature
3.39
3.38
NO LOAD
3.37
RL = 120Ω
3.36
RL = 54Ω
3.35
3.34
3.33
–40 –15
10
35
60
85
TEMPERATURE (°C)
Figure 23. ADM2682E Isolated Supply Voltage vs. Temperature
(VCC = 3.3 V, Data Rate = 16 Mbps)
Data Sheet
3.44
3.43
3.42
3.41
3.40
3.39
3.38
3.37
3.36
RL = 120Ω
NO LOAD
RL = 54Ω
3.35
3.34
–40 –15
10
35
60
85
TEMPERATURE (°C)
Figure 24. ADM2682E Isolated Supply Voltage vs. Temperature
(VCC = 5 V, Data Rate = 16 Mbps)
3.37
3.36
3.35
NO LOAD
3.34
RL = 120Ω
3.33
RL = 54Ω
3.32
3.31
3.30
–40
–15 10 35 60
TEMPERATURE (°C)
85
Figure 25. ADM2687E Isolated Supply Voltage vs. Temperature
(VCC = 3.3 V, Data Rate = 500 kbps)
3.39
3.38
3.37
3.36
3.35
3.34
3.33
RL = 120Ω
NO LOAD
RL = 54Ω
3.32
3.31
–40 –15
10
35
60
85
TEMPERATURE (°C)
Figure 26. ADM2687E Isolated Supply Voltage vs. Temperature
(VCC = 5 V, Data Rate = 500 kbps)
Rev. C | Page 12 of 24

12 Page





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