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ADUM7442 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADUM7442
Beschreibung (ADUM7440 - ADUM7442) 1 KV RMS Quad-Channel Digital Isolator
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 20 Seiten
ADUM7442 Datasheet, Funktion
Data Sheet
1 kV RMS Quad-Channel Digital Isolators
ADuM7440/ADuM7441/ADuM7442
FEATURES
Small, 16-lead QSOP
1000 V rms isolation rating
Safety and regulatory approvals
UL recognition
UL 1577: 1000 V rms for 1 minute
Low power operation
5 V operation
2.25 mA per channel maximum at 0 Mbps to 1 Mbps
11.5 mA per channel maximum at 25 Mbps
3.3 V operation
1.5 mA per channel maximum at 0 Mbps to 1 Mbps
8.25 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 ADuM7440/ADuM7441/ADuM74421 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 ADuM7440/ADuM7441/ADuM7442 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 ADuM7440/ADuM7441/ADuM7442 free almost
70% of board space and yet can still withstand high isolation
voltage and meet UL regulatory requirements. In addition to the
space savings, the ADuM7440/ADuM7441/ADuM7442 offer 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
ADuM7440/ADuM7441/ADuM7442 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 ADuM7440/ADuM7441/ADuM7442 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.
VDD1A 1
GND1 2
VIA 3
ADuM7440
ENCODE
DECODE
VIB 4
ENCODE
DECODE
VIC 5
ENCODE
DECODE
VID 6
VDD1B 7
GND1 8
ENCODE
DECODE
Figure 1. ADuM7440
16 VDD2A
15 GND2
14 VOA
13 VOB
12 VOC
11 VOD
10 VDD2B
9 GND2
FUNCTIONAL BLOCK DIAGRAMS
VDD1A 1
GND1 2
VIA 3
VIB 4
ADuM7441
ENCODE
ENCODE
DECODE
DECODE
VIC 5
ENCODE
DECODE
VOD 6
VDD1B 7
GND1 8
DECODE
ENCODE
Figure 2. ADuM7441
16 VDD2A
15 GND2
14 VOA
13 VOB
12 VOC
11 VID
10 VDD2B
9 GND2
VDD1A 1
GND1 2
VIA 3
VIB 4
ADuM7442
ENCODE
ENCODE
DECODE
DECODE
VOC 5
DECODE
ENCODE
VOD 6
VDD1B 7
GND1 8
DECODE
ENCODE
Figure 3. ADuM7442
16 VDD2A
15 GND2
14 VOA
13 VOB
12 VIC
11 VID
10 VDD2B
9 GND2
Rev. D
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2009–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com






ADUM7442 Datasheet, Funktion
ADuM7440/ADuM7441/ADuM7442
Data Sheet
ELECTRICAL CHARACTERISTICS—MIXED 3.3 V/5 V OPERATION
All typical specifications are at TA = 25°C, VDD1 = 3.3 V, VDD2 = 5 V. Minimum/maximum specifications apply over the entire recommended
operation range of 3.0 V ≤ VDD1 ≤ 3.6 V, 4.5 V ≤ VDD2 ≤ 5.5 V, and −40°C ≤ TA ≤ +105°C, unless otherwise noted. Switching specifications
are tested with CL = 15 pF and CMOS signal levels, unless otherwise noted.
Table 10.
Parameter
SWITCHING SPECIFICATIONS
Data Rate
Propagation Delay
Pulse Width Distortion
Change vs. Temperature
Pulse Width
Propagation Delay Skew1
Channel Matching
Codirectional
Opposing-Direction
Jitter
Symbol
A Grade
C Grade
Min Typ Max Min Typ Max Unit
Test Conditions/Comments
1 25 Mbps Within PWD limit
tPHL, tPLH
55 80
31 46 60
ns
50% input to 50% output
PWD
10 25
2 5 ns |tPLH − tPHL|
5 3 ps/°C
PW 250
40
ns Within PWD limit
tPSK 20 10 ns
tPSKCD
tPSKOD
25
30
2
25
37
2
ns
ns
ns
1 tPSK is the magnitude of the worst-case difference in tPHL or tPLH that is measured between units at the same operating temperature, supply voltages, and output load
within the recommended operating conditions.
Table 11.
1 Mbps—A, C Grades
25 Mbps—C Grade
Parameter
Symbol Min Typ Max Min Typ Max Unit Test Conditions/Comments
SUPPLY CURRENT
ADuM7440
ADuM7441
ADuM7442
IDD1
IDD2
IDD1
IDD2
IDD1
IDD2
2.7 3.3
2.5 3.3
2.5 3.3
3.6 4.6
2.0 2.4
3.2 4.0
18 24
5.7 8.0
12 20
8.0 11
8.9 13
12 15
mA
mA
mA
mA
mA
mA
Table 12. For All Models
Parameter
DC SPECIFICATIONS
Logic High Input Threshold
Logic Low Input Threshold
Logic High Output Voltages
Logic Low Output Voltages
Input Current per Channel
Supply Current per Channel
Quiescent Input Supply Current
Quiescent Output Supply Current
Dynamic Input Supply Current
Dynamic Output Supply Current
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity1
Refresh Rate
Symbol Min
Typ
Max Unit
Test Conditions/Comments
VIH 0.7 VDDx
V
VIL 0.3 VDDx V
VOH VDDx − 0.1 VDDx
V
VDDx − 0.4 VDDx − 0.2
V
VOL 0.0 0.1 V
0.2 0.4 V
II −10 +0.01 +10 µA
IOx = −20 µA, VIx = VIxH
IOx = −4 mA, VIx = VIxH
IOx = 20 µA, VIx = VIxL
IOx = 4 mA, VIx = VIxL
0 V ≤ VIx ≤ VDDx
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
0.50 0.60 mA
0.61 0.73 mA
0.17 mA/Mbps
0.03 mA/Mbps
tR/tF
|CM|
fr
15
2.5
20
1.1
ns
kV/µs
Mbps
10% to 90%
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
1 |CM| is the maximum common-mode voltage slew rate that can be sustained while maintaining VO > 0.8 VDD. The common-mode voltage slew rates apply to both
rising and falling common-mode voltage edges.
Rev. D | Page 6 of 20

6 Page









ADUM7442 pdf, datenblatt
ADuM7440/ADuM7441/ADuM7442
TYPICAL PERFORMANCE CHARACTERISTICS
10
8
6
5V
4
3V
2
0
0 5 10 15 20 25 30
DATA RATE (Mbps)
Figure 8. Typical Supply Current per Input Channel vs. Data Rate
for 5 V and 3 V Operation
4
3
2
5V
1
3V
0
0 5 10 15 20 25 30
DATA RATE (Mbps)
Figure 9. Typical Supply Current per Output Channel vs. Data Rate
for 5 V and 3 V Operation (No Output Load)
4
3
2 5V
3V
1
0
0 5 10 15 20 25 30
DATA RATE (Mbps)
Figure 10. Typical Supply Current per Output Channel vs. Data Rate
for 5 V and 3 V Operation (15 pF Output Load)
Data Sheet
35
30
25
5V
20
15
3V
10
5
0
0 5 10 15 20 25 30
DATA RATE (Mbps)
Figure 11. Typical ADuM7440 VDD1 Supply Current vs. Data Rate
for 5 V and 3 V Operation
10
8
6
5V
4
3V
2
0
0 5 10 15 20 25 30
DATA RATE (Mbps)
Figure 12. Typical ADuM7440 VDD2 Supply Current vs. Data Rate
for 5 V and 3 V Operation
35
30
25
20
5V
15
3V
10
5
0
0 5 10 15 20 25 30
DATA RATE (Mbps)
Figure 13. Typical ADuM7441 VDD1 Supply Current vs. Data Rate
for 5 V and 3 V Operation
Rev. D | Page 12 of 20

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