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ADM2795E Datasheet

Robust 5kV RMS Isolated RS-485/RS-422 Transceiver

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Data Sheet
Robust 5 kV RMS Isolated RS-485/RS-422 Transceiver
with Level 4 EMC and Full ±42 V Protection
ADM2795E
FEATURES
APPLICATIONS
5 kV rms isolated RS-485/RS-422 transceiver
±42 V ac/dc peak fault protection on RS-485 bus pins
Certified Level 4 EMC protection on RS-485 A, B bus pins
IEC 61000-4-5 surge protection (±4 kV)
IEC 61000-4-4 electrical fast transient (EFT) protection (±2 kV)
IEC 61000-4-2 electrostatic discharge (ESD) protection
±8 kV contact discharge
±15 kV air discharge
IEC 61000-4-6 conducted radio frequency (RF) immunity
(10 V/m rms)
Certified IEC 61000-4-x immunity across isolation barrier
IEC 61000-4-2 ESD, IEC 61000-4-4 EFT, IEC 61000-4-5 surge,
IEC 61000-4-6 conducted RF immunity, IEC 61000-4-3
radiated immunity, IEC 61000-4-8 magnetic immunity
RS-485 A, B pins human body model (HBM) ESD protection:
>±30 kV
Safety and regulatory approvals (pending)
CSA Component Acceptance Notice 5A, DIN V VDE V 0884-10,
UL 1577, CQC11-471543-2012
TIA/EIA RS-485/RS-422 compliant over full supply range
3 V to 5.5 V operating voltage range on VDD2
1.7 V to 5.5 V operating voltage range on VDD1 logic supply
Common-mode input range of −25 V to +25 V
High common-mode transient immunity: >75 kV/μs
Robust noise immunity (tested to the IEC 62132-4 standard)
Passes EN55022 Class B radiated emissions by 6 dBµV/m margin
Receiver short-circuit, open-circuit, and floating input fail-safe
Supports 256 bus nodes (96 kΩ receiver input impedance)
−40°C to +125°C temperature option
Glitch free power-up/power-down (hot swap)
Heating, ventilation, and air conditioning (HVAC) networks
Industrial field buses
Building automation
Utility networks
GENERAL DESCRIPTION
The ADM2795E is a 5 kV rms signal isolated RS-485 transceiver
that features up to ±42 V of ac/dc peak bus overvoltage fault protec-
tion on the RS-485 bus pins. The device integrates Analog Devices,
Inc., iCoupler® technology to combine a 3-channel isolator, RS-485
transceiver, and IEC electromagnetic compatibility (EMC)
transient protection in a single package. The ADM2795E is a
RS-485/RS-422 transceiver that integrates IEC 61000-4-5 Level 4
surge protection, allowing up to ±4 kV protection on the RS-485
bus pins (A and B). The device has IEC 61000-4-4 Level 4 EFT
protection up to ±2 kV and IEC 61000-4-2 Level 4 ESD protection
on the bus pins, allowing this device to withstand up to ±15 kV on
the transceiver interface pins without latching up. This device
has an extended common-mode input range of ±25 V to improve
data communication reliability in noisy environments. The
ADM2795E is capable of operating over wide power supply
ranges, with a 1.7 V to 5.5 V VDD1 power supply range, allowing
interfacing to low voltage logic supplies. The ADM2795E is also
fully TIA/EIA RS-485/RS-422 compliant when operated over a
3 V to 5.5 V VDD2 power supply. The device is fully characterized
over an extended operating temperature range of −40°C to +125°C,
and is available in a 16-lead, wide-body SOIC package.
FUNCTIONAL BLOCK DIAGRAM
VDD1
VDD2
DIGITAL ISOLATOR
RS-485
TRANSCEIVER
ADM2795E
RxD
RE
DE
EMC
TRANSIENT
PROTECTION
CIRCUIT
A
B
TxD
GND1
ISOLATION
BARRIER
Figure 1.
GND2
Rev. B
Document Feedback
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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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2016-2020 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

ADM2795E Datasheet

Robust 5kV RMS Isolated RS-485/RS-422 Transceiver

No Preview Available !

ADM2795E
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
General Description ......................................................................... 1 
Functional Block Diagram .............................................................. 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Timing Specifications .................................................................. 4 
Insulation and Safety-Related Specifications............................ 5 
Package Characteristics ............................................................... 5 
Regulatory Information............................................................... 5 
DIN V VDE V 0884-10 (VDE V 0884-10) Insulation
Characteristics .............................................................................. 6 
Absolute Maximum Ratings............................................................ 7 
Thermal Resistance ...................................................................... 7 
ESD Caution.................................................................................. 7 
Pin Configuration and Function Descriptions............................. 8 
Typical Performance Characteristics ............................................. 9 
Test Circuits..................................................................................... 13 
Switching Characteristics .......................................................... 14 
Theory of Operation ...................................................................... 15 
RS-485 with Robustness ............................................................ 15 
Integrated and Certified IEC EMC Solution .......................... 15 
REVISION HISTORY
1/2020—Rev. A to Rev. B
Added EMC Compliant and Fault Protected Signal and Power
Isolated RS485 Node Section, Table 2; Renumbered
Sequentially, and Figure 53; Renumbered Sequentially ............ 27
3/2017—Rev. 0 to Rev. A
Changes to Table 5............................................................................ 5
Changes to DIN V VDE V 0884-10 (VDE V 0884-10)
Insulation Characteristics Section.................................................. 6
10/2016—Revision 0: Initial Version
Data Sheet
Overvoltage Fault Protection.................................................... 16 
±42 V Miswire Protection......................................................... 16 
RS-485 Network Biasing and Termination ............................. 16 
IEC ESD, EFT, and Surge Protection ....................................... 17 
IEC Conducted, Radiated, and Magnetic Immunity............. 21 
Applications Information .............................................................. 23 
Radiated Emissions and PCB Layout ...................................... 23 
Noise Immunity.......................................................................... 23 
Fully RS-485 Compliant over an Extended ±25 V Common-
Mode Voltage Range .................................................................. 23 
1.7 V to 5.5 V VDD1 Logic Supply.............................................. 23 
Truth Tables................................................................................. 24 
Receiver Fail-Safe ....................................................................... 24 
RS-485 Data Rate and Bus Capacitance .................................. 24 
Insulation Wear Out .................................................................. 24 
Hot Swap Capability................................................................... 25 
Robust Half-Duplex RS-485 Network ..................................... 25 
EMC Compliant and Fault Protected Signal and Power
Isolated RS-485 Node ................................................................ 27 
Outline Dimensions ....................................................................... 28 
Ordering Guide .......................................................................... 28 
Rev. B | Page 2 of 28


Part Number ADM2795E
Description Robust 5kV RMS Isolated RS-485/RS-422 Transceiver
Maker Analog Devices
Total Page 28 Pages
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