1 kV RMS Quad-Channel Digital Isolators
ADuM7440/ADuM7441/ADuM7442
FEATURES
GENERAL DESCRIPTION
Small, 16-lead QSOP
The ADuM744x1 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
1000 V rms isolation rating
Safety and regulatory approvals
UL recognition
UL 1577: 1000 V rms for 1 minute
CSA Component Acceptance Notice #5A (pending)
Low power operation
5 V operation
2.25 mA per channel maximum @ 0 Mbps to 1 Mbps
11.5 mA per channel maximum @ 25 Mbps
3.3 V operation
1.5 mA per channel maximum @ 0 Mbps to 1 Mbps
8.25 mA per channel maximum @ 25 Mbps
Bidirectional communication
devices and other integrated couplers.
The ADuM744x 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 ADuM744x
frees almost 70% of board space and yet can still withstand high
isolation voltage and meet regulatory requirements such as UL
and CSA standards (pending). In addition to the space savings,
the ADuM744x offers a lower price than 2.5 kV or 5 kV
isolators where only functional isolation is needed.
Up to 25 Mbps data rate (NRZ)
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 ADuM744x 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.
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
The ADuM744x 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
1
2
3
16
15
14
1
2
3
16
15
14
1
2
3
16
15
14
V
V
V
V
DD2A
V
V
DD2A
DD1A
DD2A
DD1A
DD1A
ADuM7441
ADuM7442
ADuM7440
GND
V
GND
GND
V
GND
GND
V
GND
1
2
1
2
1
2
ENCODE
ENCODE
ENCODE
DECODE
DECODE
DECODE
DECODE
ENCODE
V
ENCODE
ENCODE
DECODE
DECODE
DECODE
DECODE
ENCODE
ENCODE
V
ENCODE
ENCODE
ENCODE
ENCODE
DECODE
DECODE
DECODE
DECODE
V
IA
IB
OA
IA
IB
OA
IA
IB
OA
V
V
4
5
13
12
V
4
5
13
12
4
5
13
12
V
V
V
OB
OB
OB
V
V
V
V
V
V
V
V
IC
OC
OD
IC
OC
OC
IC
6
7
8
11
10
9
V
6
7
8
11
10
9
V
6
7
8
11
10
9
V
V
V
ID
OD
ID
OD
ID
V
V
V
V
V
DD2B
DD1B
DD2B
DD1B
DD2B
DD1B
GND
GND
GND
GND
GND
GND
2
1
2
1
2
1
Figure 1. ADuM7440
Figure 2. ADuM7441
Figure 3. ADuM7442
Rev. B
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
rightsof third parties that may result fromits 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 andregisteredtrademarks 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 www.analog.com
Fax: 781.461.3113 ©2009–2011 Analog Devices, Inc. All rights reserved.
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