ADUM7440 Datasheet, PDF (1/20 Pages) Analog Devices – 1 kV RMS Quad-Channel Digital Isolators

1 kV RMS Quad-Channel Digital Isolators
ADuM7440/ADuM7441/ADuM7442
FEATURES
Small, 16-lead QSOP
1000 V rms isolation rating
Safety and regulatory approvals (pending)
UL recognition
UL 1577: 1000 V rms for 1 minute
CSA Component Acceptance Notice #5A
Low power operation
5 V operation
2.25 mA per channel maximum @ 0 Mbps to 1 Mbps
11.5 mA per channel maximum @ 25 Mbps
3.3 V operation
1.5 mA per channel maximum @ 0 Mbps to 1 Mbps
8.25 mA per channel maximum @ 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 ADuM744x¹ are 4-channel digital isolators based on the
Analog Devices, Inc., iCoupler® technology. Combining high
speed CMOS and monolithic air core transformer technologies,
these isolation components provide outstanding performance
characteristics superior to the alternatives, such as optocoupler
devices and other integrated couplers.
The ADuM744x family of quad 1 kV digital isolation devices
is packaged in a small 16-lead QSOP. While most 4-channel
isolators come in 16-lead wide SOIC packages, the ADuM744x
frees almost 70% of board space and yet can still withstand high
isolation voltage and meet regulatory requirements such as UL
and CSA standards (pending). In addition to the space savings,
the ADuM744x offers a lower price than 2.5 kV or 5 kV
isolators where only functional isolation is needed.
This family, like many Analog Devices isolators, offers very
low power consumption, consuming one-tenth to one-sixth
the power of comparable isolators at comparable data rates up
to 25 Mbps. Despite the low power consumption, all models of
the ADuM744x provide low pulse width distortion (< 5 ns for
C grade). In addition, every model has an input glitch filter to
protect against extraneous noise disturbances.
The ADuM744x isolators provide four independent isolation
channels in a variety of channel configurations and two data
rates (see the Ordering Guide) up to 25 Mbps. All models
operate with the supply voltage on either side ranging from
3.0 V to 5.5 V, providing compatibility with lower voltage
systems as well as enabling voltage translation functionality
across the isolation barrier. All products also have an output
default high logic state in the absence of the input power.
1 _{Protected by U.S. Patents 5,952,849, 6,873,065 and 7,075,329. Other patents}
pending.
V_DD1A 1
GND₁ 2
V_IA 3
ADuM7440
ENCODE
DECODE
V_IB 4
ENCODE
DECODE
V_IC 5
ENCODE
DECODE
V_ID 6
V_DD1B 7
GND₁ 8
ENCODE
DECODE
Figure 1. ADuM7440
16 V_DD2A
15 GND₂
14 V_OA
13 V_OB
12 V_OC
11 V_OD
10 V_DD2B
9 GND₂
FUNCTIONAL BLOCK DIAGRAMS
V_DD1A 1
GND₁ 2
V_IA 3
ADuM7441
ENCODE
DECODE
V_IB 4
ENCODE
DECODE
V_IC 5
ENCODE
DECODE
V_OD 6
V_DD1B 7
GND₁ 8
DECODE
ENCODE
Figure 2. ADuM7441
16 V_DD2A
15 GND₂
14 V_OA
13 V_OB
12 V_OC
11 V_ID
10 V_DD2B
9 GND₂
V_DD1A 1
GND₁ 2
V_IA 3
ADuM7442
ENCODE
DECODE
V_IB 4
ENCODE
DECODE
V_OC 5
DECODE
ENCODE
V_OD 6
V_DD1B 7
GND₁ 8
DECODE
ENCODE
Figure 3. ADuM7442
16 V_DD2A
15 GND₂
14 V_OA
13 V_OB
12 V_IC
11 V_ID
10 V_DD2B
9 GND₂
Rev. 0
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