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ADM2795ETRWZ-EP-R7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
Robust 5 kV RMS Isolated RS-485 Transceiver with
Level 4 DO-160G EMC and Full
±
42 V Protection
Enhanced Product
ADM2795E-EP
Rev. 0 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 ©2017 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
FEATURES
5 kV rms isolated RS-485 transceiver
±42 V ac/dc peak fault protection on RS-485 bus pins
DO-160G Section 25 ESD protection: ±15 kV air discharge
Fully certified DO-160G EMC protection on RS-485 bus pins
Section 22 lightning protection Waveform 3, Waveform 4/
Waveform 1, Waveform 5A Pin injection, Level 4
protection
RS-485 A, B pins HBM ESD protection: >±30 kV
Safety and regulatory approvals
CSA Component Acceptance Notice 5A, DIN V VDE V 0884-10,
UL 1577, CQC11-471543-2012 (pending)
TIA/EIA RS-485/RS-422 compliant over full supply range
3 V to 5.5 V operating voltage range on V
DD2
1.7 V to 5.5 V operating voltage range on V
DD1
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)
Glitch free power-up/power-down (hot swap)
ENHANCED PRODUCT FEATURES
Supports defense and aerospace applications (AQEC
standard)
Military −55°C to +125°C temperature range
Controlled manufacturing baseline
1 assembly/test site
Enhanced product change notification
Qualification data available on request
APPLICATIONS
Military and aerospace (MILA) avionics for sensors,
actuators, and engine control
GENERAL DESCRIPTION
The ADM2795E-EP is a 5 kV rms signal isolated RS-485 trans-
ceiver that features up to ±42 V of ac/dc peak bus overvoltage fault
protection 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 compatibil-
ity (EMC) transient protection in a single package. The
ADM2795E-EP integrates fully certified DO-160G EMC protec-
tion on the RS-485 bus pins, with Section 22 lightning protection.
The ADM2795E-EP also provides Section 25 ±15 kV ESD air
discharge protection. For Section 22 lightning, the ADM2795E-EP
provides protection for Waveform 3, Waveform 4/ Waveform 1,
and Wavefor m 5A to Level 4 using 33 Ω or 47 Ω current
limiting resistors to GND
2
, or to Level 4 across the isolation
barrier to GND
1
. This device has an extended common-mode
input range of ±25 V to improve data communication reliability in
noisy environments. The ADM2795E-EP is capable of operating
over wide power supply ranges, with a 1.7 V to 5.5 V V
DD1
power
supply range, allowing interfacing to low voltage logic supplies.
The ADM2795E-EP is also fully TIA/EIA RS-485/RS-422
compliant when operated over a 3 V to 5.5 V V
DD2
power supply.
The device is fully characterized over an extended operating
temperature range of −55°C to +125°C, and is available in a
16-lead, wide-body SOIC package.
Additional application and technical information can be found
in the ADM2795E data sheet.
FUNCTIONAL BLOCK DIAGRAM
F
igure 1.
RxD
RE
DE
RS-485
TRANSCEIVER
TxD
A
B
V
DD2
V
DD1
ADM2795E-EP
EMC
TRANSIENT
PROTECTION
CIRCUIT
GND
2
GND
1
DIGITAL ISOLATOR
ISOLATION
BARRIER
15664-001
ADM2795E-EP Enhanced Product
Rev. 0 | Page 2 of 17
TABLE OF CONTENTS
Features .............................................................................................. 1
Enhanced Product 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 Added DO-160G EMC Robustness .................. 15
Certified DO-160G EMC Protection ...................................... 15
DO-160G ADM2795E-EP Test Details ................................... 15
Outline Dimensions ....................................................................... 17
Ordering Guide .......................................................................... 17
REVISION HISTORY
7/2017—Revisio
n 0: Initial Version
Enhanced Product ADM2795E-EP
Rev. 0 | Page 3 of 17
SPECIFICATIONS
1.7 V ≤ V
DD1
≤ 5.5 V, 3 V ≤ V
DD2
≤ 5.5 V, T
A
= −55°C to +125°C. All min/max specifications apply over the entire recommended
operation range, unless otherwise noted. All typical specifications at T
A
= 25°C, V
DD1
= V
DD2
= 5.0 V, unless otherwise noted.
Table 1.
Parameter Symbol Min Typ Max Unit Test Conditions/Comments
SUPPLY CURRENT
Power Supply Current
Logic Side I
DD1
10 mA
Unloaded output, DE = V
DD1
, RE = 0 V
TxD/RxD Data Rate = 2.5 Mbps 10 mA
Unloaded output, DE = V
DD1
, RE = 0 V
Bus Side I
DD2
12 mA
Unloaded output, DE = V
DD1
, RE = 0 V
TxD/RxD Data Rate = 2.5 Mbps 90 mA
Unloaded output, DE = V
DD1
, RE = 0 V
130 mA
DE = V
DD1
, RE = 0 V, V
DD2
= 5.5 V,
R = 27 Ω, see Figure 27
94 mA
DE = V
DD1
, RE = 0 V, V
DD2
= 5.5 V,
R = 27 Ω, see Figure 27
46 mA
DE = V
DD1
, RE = 0 V, V
DD2
= 3.0 V,
R = 27 Ω, see Figure 27
Supply Current in Shutdown Mode I
SHDN
10 mA
DE = 0 V,
RE = V
DD1
DRIVER
Differential Outputs
Differential Output Voltage |V
OD
| 1.5 5.0 V
V
DD2
≥ 3.0 V, R = 27 Ω or 50 Ω,
see Figure 27
2.1 5.0 V
V
DD2
≥ 4.5 V, R = 27 Ω or 50 Ω,
see Figure 27
|V
OD3
| 1.5 5.0 V
V
DD2
≥ 3.0 V, V
CM
= −25 V to +25 V,
see Figure 28
2.1 5.0 V
V
DD2
≥ 4.5 V, V
CM
= −25 V to +25 V,
see Figure 28
Change in Differential Output
Voltage for Complementary
Output States
∆|V
OD
| 0.2 V R = 27 Ω or 50 Ω, see Figure 27
Common-Mode Output Voltage V
OC
3.0 V R = 27 Ω or 50 Ω, see Figure 27
Change in Common-Mode Output
Voltage for Complementary
Output States
∆|
VOC
| 0.2 V R = 27 Ω or 50 Ω, see Figure 27
Short-Circuit Output Current
V
OUT
= Low
I
OSL
−250
+250
mA
−42 V ≤ V
SC
≤ +42 V
1
V
OUT
= High I
OSH
−250 +250 mA −42 V ≤ V
SC
≤ +42 V
1
Logic Inputs (DE, RE, TxD)
Input Threshold Low V
IL
0.33 × V
DD1
V 1.7 V ≤ V
DD1
≤ 5.5 V
Input Threshold High V
IH
0.7 V
DD1
V 1.7 V ≤ V
DD1
≤ 5.5 V
Input Current
I
TxD
+1
µA
0 V ≤ V
IN
≤ V
DD1
RECEIVER
Differential Inputs
Differential Input Threshold Voltage
V
TH
−200
−30
mV
−25 V ≤ V
CM
≤ +25 V
Input Voltage Hysteresis V
HYS
30 mV −25 V ≤ V
CM
≤ +25 V
Input Current (A, B) I
I
−1.0 +1.0 mA DE = 0 V, V
DD2
= 0 V/5 V, V
IN
= ±25 V
−1.0 +1.0 mA DE = 0 V, V
DD2
= 0 V/5 V, V
IN
= ±42 V
Input Capacitance (A, B) C
AB
150 pF T
A
= 25°C, see Figure 17
Line Input Resistance R
IN
96 kΩ
−25 V ≤ V
CM
≤ +25 V, up to
256 nodes supported
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

ADM2795ETRWZ-EP-R7

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Manufacturer:
Analog Devices Inc.
Description:
RS-422/RS-485 Interface IC Iso EMC Protected RS-485 Transceiver
Lifecycle:
New from this manufacturer.
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