1 kV RMS Quad-Channel Digital Isolators
Data Sheet
ADuM7440/ADuM7441/ADuM7442
Rev. D 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 ©2009–2015 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
FEATURES
Small, 16-lead QSOP
1000 V rms isolation rating
Safety and regulatory approvals
UL recognition
UL 1577: 1000 V rms for 1 minute
Low power operation
5 V operation
2.25 mA per channel maximum at 0 Mbps to 1 Mbps
11.5 mA per channel maximum at 25 Mbps
3.3 V operation
1.5 mA per channel maximum at 0 Mbps to 1 Mbps
8.25 mA per channel maximum at 25 Mbps
Bidirectional communication
Up to 25 Mbps data rate (NRZ)
3 V/5 V level translation
High temperature operation: 105°C
High common-mode transient immunity: >15 kV/μs
APPLICATIONS
General-purpose, multichannel isolation
SPI interface/data converter isolation
RS-232/RS-422/RS-485 transceivers
Industrial field bus isolation
GENERAL DESCRIPTION
The ADuM7440/ADuM7441/ADuM7442
1
are 4-channel digital
isolators based on the Analog Devices, Inc., iCoupler® technology.
Combining high speed CMOS and monolithic air core transformer
technologies, these isolation components provide outstanding
performance characteristics superior to the alternatives, such as
optocoupler devices and other integrated couplers.
The ADuM7440/ADuM7441/ADuM7442 family of quad 1 kV
digital isolation devices is packaged in a small 16-lead QSOP.
While most 4-channel isolators come in 16-lead wide SOIC
packages, the ADuM7440/ADuM7441/ADuM7442 free almost
70% of board space and yet can still withstand high isolation
voltage and meet UL regulatory requirements. In addition to the
space savings, the ADuM7440/ADuM7441/ADuM7442 offer a
lower price than 2.5 kV or 5 kV isolators where only functional
isolation is needed.
This family, like many Analog Devices isolators, offers very low
power consumption, consuming one-tenth to one-sixth the
power of comparable isolators at comparable data rates up to
25 Mbps. Despite the low power consumption, all models of the
ADuM7440/ADuM7441/ADuM7442 provide low pulse width
distortion (<5 ns for C grade). In addition, every model has an
input glitch filter to protect against extraneous noise disturbances.
The ADuM7440/ADuM7441/ADuM7442 isolators provide
four independent isolation channels in a variety of channel
configurations and two data rates (see the Ordering Guide) up to
25 Mbps. All models operate with the supply voltage on either side
ranging from 3.0 V to 5.5 V, providing compatibility with lower
voltage systems as well as enabling voltage translation functionality
across the isolation barrier. All products also have an output
default high logic state in the absence of the input power.
1
Protected by U.S. Patents 5,952,849, 6,873,065 and 7,075,329. Other patents
pending.
FUNCTIONAL BLOCK DIAGRAMS
ENCODE DECODE
ENCODE DECODE
ENCODE DECODE
ENCODE DECODE
V
DD1A
GND
1
V
IA
V
IB
V
IC
V
ID
V
DD1B
GND
1
V
DD2A
GND
2
V
OA
V
OB
V
OC
V
OD
V
DD2B
GND
2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
ADuM7440
08340-001
Figure 1. ADuM7440
DECODE ENCODE
ENCODE DECODE
ENCODE DECODE
ENCODE DECODE
DD1A
GND
1
V
IA
V
IB
V
IC
V
OD
DD1B
GND
1
V
DD2A
GND
2
V
OA
V
OB
V
OC
V
ID
V
DD2B
GND
2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
ADuM7441
08340-002
Figure 2. ADuM7441
DECODE ENCODE
DECODE ENCODE
ENCODE DECODE
ENCODE DECODE
DD1A
GND
1
V
IA
V
IB
V
OC
V
OD
DD1B
GND
1
V
DD2A
GND
2
V
OA
V
OB
V
IC
V
ID
V
DD2B
GND
2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
ADuM7442
08340-003
Figure 3. ADuM7442
