Quad-Channel Digital Isolators
ADuM1400/ADuM1401/ADuM1402
Rev. B
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FEATURES
Low power operation
5 V operation
1.0 mA per channel max @ 0 Mbps to 2 Mbps
3.5 mA per channel max @ 10 Mbps
31 mA per channel max @ 90 Mbps
3 V operation
0.7 mA per channel max @ 0 Mbps to 2 Mbps
2.1 mA per channel max @ 10 Mbps
20 mA per channel max @ 90 Mbps
Bidirectional communication
3 V/5 V level translation
High temperature operation: 105°C
High data rate: dc to 90 Mbps (NRZ)
Precise timing characteristics
2 ns max pulse-width distortion
2 ns max channel-to-channel matching
High common-mode transient immunity: >25 kV/μs
Output enable function
Wide body 16-lead SOIC package, Pb-free models available
Safety and regulatory approvals
UL recognition: 2500 V rms for 1 minute per UL 1577
CSA component acceptance notice #5A
VDE certificate of conformity
DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01
DIN EN 60950 (VDE 0805): 2001-12; EN 60950: 2000
V
IORM
= 560 V peak
APPLICATIONS
General-purpose multichannel isolation
SPI® interface/data converter isolation
RS-232/RS-422/RS-485 transceiver
Industrial field bus isolation
GENERAL DESCRIPTION
The ADuM140x are 4-channel digital isolators based on Analog
Devices’ 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.
By avoiding the use of LEDs and photodiodes, iCoupler devices
remove the design difficulties commonly associated with
optocouplers. The typical optocoupler concerns regarding
uncertain current transfer ratios, nonlinear transfer functions,
and temperature and lifetime effects are eliminated with the
simple iCoupler digital interfaces and stable performance
characteristics. The need for external drivers and other discretes
is eliminated with these iCoupler products. Furthermore,
iCoupler devices consumes one-tenth to one-sixth the power of
optocouplers at comparable signal data rates.
The ADuM140x isolators provide four independent isolation
channels in a variety of channel configurations and data rates
(see the Ordering Guide). All models operate with the supply
voltage on either side ranging from 2.7 V to 5.5 V, providing
compatibility with lower voltage systems as well as enabling a
voltage translation functionality across the isolation barrier. In
addition, the ADuM140x provides low pulse-width distortion
(<2 ns for CRW grade) and tight channel-to-channel matching
(<2 ns for CRW grade). Unlike other optocoupler alternatives,
the ADuM140x isolators have a patented refresh feature that
ensures dc correctness in the absence of input logic transitions
and during power-up/power-down conditions.
FUNCTIONAL BLOCK DIAGRAMS
ENCODE DECODE
ENCODE DECODE
ENCODE DECODE
ENCODE DECODE
V
DD1
ND
1
V
IA
V
IB
V
IC
V
ID
NC
ND
1
V
DD2
GND
2
V
OA
V
OB
V
OC
V
OD
V
E2
GND
2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
03786-0-001
Figure 1. ADuM1400 Functional Block Diagram
DECODE ENCODE
DECODE ENCODE
ENCODE DECODE
ENCODE DECODE
V
DD1
GND
1
V
IA
V
IB
V
IC
V
OD
V
E1
GND
1
V
DD2
GND
2
V
OA
V
OB
V
OC
V
ID
V
E2
GND
2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
03786-0-002
Figure 2. ADuM1401 Functional Block Diagram
DECODE
DECODE ENCODE
ENCODE
ENCODE DECODE
ENCODE DECODE
V
DD1
GND
1
V
IA
V
IB
V
OC
V
OD
V
E1
GND
1
V
DD2
GND
2
V
OA
V
OB
V
IC
V
ID
V
E2
GND
2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
03786-0-003
Figure 3. ADuM1402 Functional Block Diagram
