Robust 5 kV RMS Isolated RS-485/RS-422 Transceiver
with Level 4 EMC and Full ±42 V Protection
Data Sheet
ADM2795E
FEATURES
APPLICATIONS
5 kV rms isolated RS-485/RS-422 transceiver
Heating, ventilation, and air conditioning (HVAC) networks
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)
Industrial field buses
Building automation
Utility networks
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 dBꢀV/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
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.
Glitch free power-up/power-down (hot swap)
FUNCTIONAL BLOCK DIAGRAM
V
V
DD2
DD1
RS-485
TRANSCEIVER
ADM2795E
DIGITAL ISOLATOR
RxD
RE
EMC
A
B
TRANSIENT
PROTECTION
CIRCUIT
DE
TxD
GND
GND
2
1
ISOLATION
BARRIER
Figure 1.
Rev. A
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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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Technical Support
©2016-2017 Analog Devices, Inc. All rights reserved.
www.analog.com
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