3 kV RMS Dual Channel Digital Isolators
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
Up to 100 Mbps data rate (NRZ)
Low propagation delay: 23 ns typical
Low dynamic power consumption
Bidirectional communication
3.3 V to 5 V level translation
High temperature operation: 125°C
High common-mode transient immunity: >25 kV/μs
Default high output: ADuM1280/ADuM1281
Default low output: ADuM1285/ADuM1286
Narrow body, RoHS-compliant, 8-lead SOIC
Safety and regulatory approvals
UL recognition: 3000 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice 5A
VDE Certificate of Conformity
ADuM1280/
1
2
3
4
8
7
6
5
V
V
V
V
DD1
DD2
OA
OB
ADuM1285
ENCODE
DECODE
DECODE
V
V
IA
ENCODE
IB
GND
GND
2
1
Figure 1. ADuM1280/ADuM1285
ADuM1281/
ADuM1286
1
2
3
4
8
7
6
5
V
V
V
V
DD1
DD2
DECODE
ENCODE
DECODE
V
OA
IA
ENCODE
V
IB
OB
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
GND
GND
2
1
V
IORM = 560 V peak
Qualified for automotive applications
Figure 2. ADuM1281/ADuM1286
APPLICATIONS
General-purpose multichannel isolation
Data converter isolation
Industrial field bus isolation
Hybrid electric vehicles, battery monitor, and motor drive
GENERAL DESCRIPTION
The ADuM1280/ADuM1281/ADuM1285/ADuM12861 are dual-
channel digital isolators based on the Analog Devices, Inc.,
iCoupler® technology. Combining high speed CMOS and
monolithic air core transformer technology, these isolation
components provide outstanding performance characteristics
superior to alternatives, such as optocoupler devices and other
integrated couplers.
either side ranging from 3.135 V to 5.5 V and the automotive
grades operate from 3.135 V to 5.5 V, providing compatibility
with lower voltage systems as well as enabling a voltage
translation functionality across the isolation barrier. Unlike
other optocoupler alternatives, the ADuM1280/ADuM1281/
ADuM1285/ADuM1286 isolators have a patented refresh
feature that ensures dc correctness in the absence of input logic
transitions. When power is first applied or is not yet applied to
the input side, the ADuM1280 and ADuM1281 have a default
high output, and the ADuM1285 and ADuM1286 have a default
low output.
With propagation delay at 23 ns, pulse width distortion is less
than 2 ns for C grade. Channel-to-channel matching is tight at
5 ns for C grade. The two channels of the ADuM1280/ADuM1281/
ADuM1285/ADuM1286 are independent isolation channels
and are available in two channel configurations with three
different data rates up to 100 Mbps (see the Ordering Guide).
Industrial grade models operate with the supply voltage on
For more information on safety and regulatory approvals, go to
www.analog.com/icouplersafety.
1 Protected by U.S. Patents 5,952,849; 6,873,065; 6,903,578; and 7,075,329. Other patents are pending.
Rev. D
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