Datasheet

Micropower
Quad-Channel Digital Isolators
Data Sheet
ADuM1440/ADuM1441/ADuM1442/ADuM1445/ADuM1446/ADuM1447
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FEATURES
Ultralow power operation
3.3 V operation (typical)
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 (typical)
3.1 μA per channel quiescent current, refresh enabled
0.1 μA per channel quiescent current, refresh disabled
117 μA/Mbps per channel typical dynamic current
Small, 16-lead QSOP and 20-Lead SSOP
Bidirectional communication
Up to 2 Mbps data rate (NRZ)
High temperature operation: 125°C
High common-mode transient immunity: >25 kV/μs
Safety and regulatory approvals
UL 1577 component recognition program
2500 V rms for 1 minute per UL 1577 QSOP package
3750V rms for 1 minute per UL 1577 SSOP package
CSA Component Acceptance Notice 5A
VDE certificate of conformity
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
V
IORM
= 565 V
PEAK
QSOP package
V
IORM
= 849 V
PEAK
SSOP package
IECEx and ATEX intrinsic safety
Sira 0518 II 1G Ex ia IIC Ga
APPLICATIONS
General-purpose, low power multichannel isolation
1 MHz, low power peripheral interface (SPI)
4 mA to 20 mA loop process controls
GENERAL DESCRIPTION
The ADuM1440/ADuM1441/ADuM1442/ADuM1445/
ADuM1446/ADuM1447
1
are micropower, 4-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. 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.
The ADuM1440/ADuM1441/ADuM1442/ADuM1445/
ADuM1446/ADuM1447 family of quad 2.5 kV digital isolation
devices are packaged in a small 16-lead QSOP and 20-lead SSOP,
FUNCTIONAL BLOCK DIAGRAMS
ENCODE DECODE
ENCODE DECODE
ENCODE DECODE
ENCODE DECODE
V
DD1
GND
1
V
IA
V
IB
V
IC
/V
OC
V
ID
/V
OD
EN
1
GND
1
V
DD2
GND
2
V
OA
V
OB
V
OC
/V
IC
V
OD
/V
ID
EN
2
GND
2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
ADuM144x QSOP
11845-002
Figure 1.
ENCODE DECODE
ENCODE DECODE
ENCODE DECODE
V
DD1
GND
1
V
IA
V
IB
V
IC
/V
OC
V
ID
/V
OD
EN
1
NIC
V
DD2
GND
2
V
OA
V
OB
V
OC
/V
IC
V
OD
/V
ID
EN
2
NIC
1
2
3
4
5
7
8
20
19
18
17
16
14
13
NIC
GND
1
NIC
GND
2
9
10
12
11
ADuM144x
ENCODE DECODE
6 15
11845-102
Figure 2.
freeing almost 70% of board space compared to isolators packages
in wide body SOIC packages.
The devices withstand high isolation voltages and meet regulatory
requirements, such as UL and CSA standards. In addition to the
space savings, the ADuM1440/ADuM1441/ADuM1442/
ADuM1445/ADuM1446/ADuM1447 operate with supplies as
low as 2.25 V.
Despite the low power consumption, all models of the ADuM1440/
ADuM1441/ADuM1442/ADuM1445/ADuM1446/ADuM1447
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
CURRENT PER CHANNEL
(
µA)
DATA RATE (kbps)
EN
x
= 1
EN
x
= 0
11845-001
Figure 3. Typical Total Supply Current per Channel (V
DDx
= 3.3 V)
1
Protected by U.S. Patents 5,952,849, 6,873,065, 7,075,329, 6,262,600. Other patents pending.