Micropower, Dual-Channel Digital Isolators
Data Sheet
ADuM1240/ADuM1241/ADuM1245/ADuM1246
Rev. B Document Feedback
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FEATURES
Ultralow power operation
3.3 V operation
5.6 μA per channel quiescent current, refresh enabled
0.3 μA per channel quiescent current, refresh disabled
148 μA/Mbps per channel typical dynamic current
2.5 V operation
3.1 μA per channel quiescent current, refresh enabled
0.1 μA per channel quiescent current, refresh disabled
116 μA/Mbps per channel typical dynamic current
Small, 20-lead SSOP package and small 8-lead SOIC package
Bidirectional communication
Up to 2 Mbps data rate nonreturn to zero (NRZ)
High temperature operation: 125°C
High common-mode transient immunity: >25 kV/μs
Safety and Regulatory Approvals
UL 1577 component recognition program
3750 V rms for 1 minute per UL 1577 (20-lead SSOP)
3000 V rms for 1 minute per UL 1577 (8-lead SOIC)
CSA Component Acceptance Notice 5A
VDE certificate of conformity
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
V
IORM
= 849 V peak (20-lead SSOP)
V
IORM
= 560 V peak (8-lead SOIC)
APPLICATIONS
General-purpose, low power, multichannel isolation
1 MHz low power serial peripheral interface (SPI)
4 mA to 20 mA loop process control
GENERAL DESCRIPTION
The ADuM1240/ADuM1241/ADuM1245/ADuM1246
1
are
micropower, 2-channel, digital isolators based on the Analog
Devices, Inc., iCoupler® technology. Combining high speed,
complementary metal oxide semiconductor (CMOS) and
monolithic air core transformer technologies, these isolation
components provide outstanding performance characteristics
superior to the alternatives, such as optocoupler devices.
The 20-lead SSOP version of the ADuM1240/ADuM1241/
ADuM1245/ADuM1246 allows control of the internal refresh
functions. As shown in Figure 3, in standard operating mode,
when EN
x
= 0 (internal refresh enabled), the current per channel is
less than 10 μA.
When EN
x
= 1 (internal refresh disabled), the current per
channel drops to less than 1 μA.
FUNCTIONAL BLOCK DIAGRAMS
ENCODE DECODE
ENCODE DECODE
V
DD1
GND
1
NIC
NIC
IA
/V
OA
V
IB
EN
1
NIC
V
DD2
GND
2
NIC
NIC
V
OA
/V
IA
V
OB
EN
2
NIC
1
2
3
4
5
6
7
8
20
19
18
17
16
15
14
13
NIC
GND
1
NIC
GND
2
9
10
12
11
ADuM124x
11925-002
Figure 1. 20-Lead SSOP Package Functional Block Diagram
ENCODE DECODE
ENCODE DECODE
V
DD1
GND
1
IA
/V
OA
V
IB
V
DD2
V
OA
/V
IA
V
OB
1
2
3
4
8
7
6
5
GND
2
ADuM124x
11925-102
Figure 2. 8-Lead SOIC Package Functional Block Diagram
The ADuM1240/ADuM1241/ADuM1245/ADuM1246 are
packaged in either a 20-lead SSOP for 3.75 kV reinforced
isolation or an 8-lead SOIC for 3 kV basic isolation. The devices
meet regulatory requirements, such as UL and CSA standards.
In addition to the space saving package options, the ADuM1240/
ADuM1241/ADuM1245/ADuM1246 operate with supplies as
low as 2.25 V. All models provide low, pulse width distortion at
<8 ns. In addition, every model has an input glitch filter to
protect against extraneous noise disturbances.
0.1
1
10
100
1000
0.1 1 10 100 1000 10000
TYPIC
L TOTAL SUPPLY CURRENT
PER CHANNEL (µA)
DATA RATE (kbps)
EN
x
= 1
EN
x
= 0
11925-001
Figure 3. Typical Total Supply Current (IDD1 + IDD2) per Channel (VDDx =
3.3 V) as a Function of Data Rate
1
Protected by U.S. Patents 5,952,849, 6,873,065, 7,075,329, 6,262,600. Other patents pending.
