Quad-Channel Isolators with
Integrated DC-to-DC Converter
Data Sheet
ADuM6420A/ADuM6421A/ADuM6422A
FEATURES
FUNCTIONAL BLOCK DIAGRAM
isoPower integrated, isolated dc-to-dc converter
100 mA output supply
Meets CISPR 32/EN55032 Class B emission limits up to
5 Mbps at a full load on a 2-layer PCB
Quad dc to 100 Mbps signal isolation channels
28-lead, fine pitch, SOIC with 8.3 mm minimum creepage
High temperature operation: 125°C maximum
High common-mode transient immunity: 100 kV/μs
Safety and regulatory approvals (pending)
UL recognition (pending)
1
2
3
28
27
26
V
V
DD2
DD1
GND
GND
V
GND
GND
1
1
2
2
4
5
25
24
23
22
21
20
V
4-CHANNEL iCoupler CORE
LOW POWER ON-OFF KEYING
IA
IB
OA
V
V
OB
ADuM6420A/
ADuM6421A/
ADuM6422A
V
V
/V
V
V
/V
6
IC OC
OC IC
/V
7
/V
ID OD
OD ID
LOW RADIATED EMISSIONS DC TO DC
PCS
GND
1
8
GND
2
PDIS
9
V
SEL
5000 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice 5A (pending)
VDE V 0884-11 certificate of conformity (pending)
GND
1
10
11
12
13
14
19 GND
ISO
V
OSC
18
RECT REG
V
DDP
ISO
V
IORM = 566 V peak
17 GND
GND
1
ISO
16
15
NIC
NIC
APPLICATIONS
GND
1
GND
ISO
RS-232 transceivers
Power supply start-up bias and gate drives
Isolated sensor interfaces
Industrial programmable logic controllers (PLCs)
NIC = NO INTERNAL CONNECTION. LEAVE THIS PIN FLOATING.
Figure 1.
GENERAL DESCRIPTION
The ADuM6420A/ADuM6421A/ADuM6422A1 are quad-channel
digital isolators with an isoPower®, integrated, isolated dc-to-dc
converter. Based on the Analog Devices, Inc., iCoupler®
technology, the dc-to-dc converter provides regulated, isolated
power that meets CISPR 32/EN 55032 Class B limits at a full
load on a 2-layer printed circuit board (PCB) with ferrites.
Popular voltage combinations and the associated output
current levels are listed in Table 1.
The ADuM6420A/ADuM6421A/ADuM6422A isolators
provide four independent isolation channels (see the Pin
Configurations and Function Descriptions for additional
information).
Table 1. ADuM6420A/ADuM6421A/ADuM6422A Output
Current Levels
ISO Current, IISO (mA)
VDDP (V)
VISO (V)
5
3.3
85°C
100
100
60
105°C
65
65
125°C
30
30
The ADuM6420A/ADuM6421A/ADuM6422A eliminate the
need for a separate, isolated dc-to-dc converter in 500 mW,
isolated designs. The iCoupler chip scale transformer technology
is used for isolated logic signals and for the magnetic components
of the dc-to-dc converter. The result is a small form factor, total
isolation solution.
5
5
3.3
3.3
60
20
1 Protected by U.S. Patents 5,952,849; 6,873,065; 6,903,578; and 7,075,329. Other patents are pending.
Rev. A
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