1 kV RMS Six-Channel Digital Isolators
Data Sheet
ADuM7640/ADuM7641/ADuM7642/ADuM7643
Rev. 0
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FEATURES
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
3.3 V operation
1.6 mA per channel maximum at 0 Mbps to 1 Mbps
7.8 mA per channel maximum at 25 Mbps
5 V operation
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
High temperature operation: 105°C
High common-mode transient immunity: >15 kV/μs
APPLICATIONS
General-purpose, multichannel isolation
SPI interface/data converter isolation
RS-232/RS-422/RS-485 transceivers
Industrial field bus isolation
GENERAL DESCRIPTION
The ADuM7640/ADuM7641/ADuM7642/ADuM7643
1
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.
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.
FUNCTIONAL BLOCK DIAGRAMS
V
DD1A
V
DD2A
1 20
GND
1
GND
2
2 19
V
IA
V
OA
3 18
ENCODE DECODE
V
IB
V
OB
4 17
ENCODE DECODE
V
IC
V
OC
5 16
ENCODE DECODE
V
ID
V
OD
6 15
ENCODE DECODE
V
DD1B
V
DD2B
7 14
V
IE
V
OE
8 13
ENCODE DECODE
V
IF
V
OF
9 12
ENCODE DECODE
GND
1
GND
2
10 11
ADuM7640
10448-001
Figure 1. ADuM7640
V
DD1A
V
DD2A
1 20
GND
1
GND
2
2 19
V
IA
V
OA
3 18
ENCODE DECODE
V
IB
V
OB
4 17
ENCODE DECODE
V
IC
V
OC
5 16
ENCODE DECODE
V
ID
V
OD
6 15
ENCODE DECODE
V
DD1B
V
DD2B
7 14
V
OE
V
IE
8 13
DECODE ENCODE
V
IF
V
OF
9 12
ENCODE DECODE
GND
1
GND
2
10 11
ADuM7641
10448-002
Figure 2. ADuM7641
V
DD1A
V
DD2A
1 20
GND
1
GND
2
2 19
V
IA
V
OA
3 18
ENCODE DECODE
V
IB
V
OB
4 17
ENCODE DECODE
V
IC
V
OC
5 16
ENCODE DECODE
V
OD
V
ID
6 15
DECODE ENCODE
V
DD1B
V
DD2B
7 14
V
OE
V
IE
8 13
DECODE ENCODE
V
IF
V
OF
9 12
ENCODE DECODE
GND
1
GND
2
10 11
ADuM7642
10448-003
Figure 3. ADuM7642
V
DD1A
V
DD2A
1 20
GND
1
GND
2
2 19
V
IA
V
OA
3 18
ENCODE DECODE
V
IB
V
OB
4 17
ENCODE DECODE
V
OC
V
IC
5 16
DECODE ENCODE
V
OD
V
ID
6 15
DECODE ENCODE
V
DD1B
V
DD2B
7 14
V
OE
V
IE
8 13
DECODE ENCODE
V
IF
V
OF
9 12
ENCODE DECODE
GND
1
GND
2
10 11
ADuM7643
10448-004
Figure 4. ADuM7643
1
Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending.
