1 kV RMS Six-Channel Digital Isolators
Data Sheet
ADuM7640/ADuM7641/ADuM7642/ADuM7643
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
Small 20-lead QSOP
1000 V rms isolation rating
Safety and regulatory approvals (pending):
UL recognition (pending)
1000 V rms for 1 minute per UL 1577
Low power operation
1
20
19
18
17
16
15
14
13
12
11
V
V
DD2A
DD1A
ADuM7640
2
GND
V
GND
1
2
ENCODE
ENCODE
ENCODE
ENCODE
DECODE
DECODE
DECODE
DECODE
3
V
IA
IB
IC
ID
OA
4
V
V
V
V
OB
5
V
OC
6
V
OD
7
V
V
V
V
DD1B
DD2B
OE
3.3 V operation
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ENCODE
DECODE
DECODE
8
V
IE
1.6 mA per channel maximum at 0 Mbps to 1 Mbps
7.8 mA per channel maximum at 25 Mbps
5 V operation
9
V
IF
OF
10
GND
GND
1
2
2.2 mA per channel maximum at 0 Mbps to 1 Mbps
11.2 mA per channel maximum at 25 Mbps
Bidirectional communication
Up to 25 Mbps data rate (NRZ)
3 V/5 V level translation
Figure 1. ADuM7640
1
2
20
19
18
17
16
15
14
13
12
11
V
V
DD2A
DD1A
ADuM7641
GND
GND
2
1
IA
IB
IC
ID
ENCODE
DECODE
DECODE
DECODE
DECODE
3
V
V
V
V
V
V
V
V
V
V
V
OA
OB
OC
OD
ENCODE
ENCODE
ENCODE
4
High temperature operation: 105°C
High common-mode transient immunity: >15 kV/μs
5
6
7
V
DD1B
DD2B
IE
APPLICATIONS
DECODE
ENCODE
ENCODE
DECODE
8
V
OE
General-purpose, multichannel isolation
SPI interface/data converter isolation
RS-232/RS-422/RS-485 transceivers
Industrial field bus isolation
9
V
IF
OF
10
GND
GND
1
2
Figure 2. ADuM7641
1
2
20
19
18
17
16
15
14
13
12
11
V
V
DD2A
DD1A
GENERAL DESCRIPTION
ADuM7642
GND
GND
2
1
IA
IB
IC
The ADuM7640/ADuM7641/ADuM7642/ADuM76431 are
6-channel digital isolators based on the Analog Devices, Inc.,
iCoupler® technology. These 1 kV digital isolation devices are
packaged in a small 20-lead QSOP. They offer space savings and
a lower price than 2.5 kV or 5 kV isolation solutions when only
functional isolation is needed.
ENCODE
DECODE
DECODE
DECODE
ENCODE
3
V
V
V
V
V
V
V
V
V
V
OA
OB
OC
ID
ENCODE
ENCODE
DECODE
4
5
6
V
OD
7
V
DD1B
DD2B
IE
DECODE
ENCODE
ENCODE
DECODE
8
V
OE
9
V
IF
OF
This family, like many Analog Devices isolators, offers very low
power consumption, using one-tenth to one-sixth the power of
other digital isolators, with the supply voltage on either side
ranging from 3.0 V to 5.5 V. Despite their low power consumption,
the ADuM7640/ADuM7641/ADuM7642/ADuM7643 provide
low pulse width distortion (< 6 ns for C grade) and a channel-
by-channel glitch filter to protect the device against extraneous
noise disturbances. Four channel direction combinations are
available with a maximum data rate of 1 Mbps or 25 Mbps. All
products have a default output high logic state in the absence of
input power.
10
GND
GND
1
2
Figure 3. ADuM7642
1
2
20
19
18
17
16
15
14
13
12
11
V
V
DD2A
DD1A
ADuM7643
GND
GND
2
1
IA
IB
ENCODE
DECODE
DECODE
ENCODE
ENCODE
3
V
V
V
V
V
V
V
V
V
OA
OB
IC
ENCODE
DECODE
DECODE
4
5
V
OC
OD
6
V
ID
7
V
DD1B
DD2B
IE
DECODE
ENCODE
ENCODE
DECODE
8
V
OE
9
V
IF
OF
10
GND
GND
2
1
Figure 4. ADuM7643
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending.
Rev. 0
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