AD ADUM7241 1 kv, dual channel digital isolator Datasheet

Narrow-body, RoHS-compliant, 8-lead SOIC
Safety and regulatory approvals
UL recognition (pending)
UL 1577: 1000 V rms for 1 minute
Low power operation
5 V operation
2.4 mA per channel maximum at 0 Mbps to 1 Mbps
11.8 mA per channel maximum at 25 Mbps
3.3 V operation
1.7 mA per channel maximum at 0 Mbps to 1 Mbps
8.2 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
FUNCTIONAL BLOCK DIAGRAMS
ADuM7240
VDD1 1
8
VDD2
VIA 2
ENCODE
DECODE
7
VOA
VIB 3
ENCODE
DECODE
6
VOB
5
GND2
8
VDD2
GND1 4
10240-001
FEATURES
Figure 1. ADuM7240
ADuM7241
VDD1 1
VOA 2
DECODE
ENCODE
7
VIA
VIB 3
ENCODE
DECODE
6
VOB
5
GND2
GND1 4
10240-002
Data Sheet
1 kV, Dual Channel Digital Isolators
ADuM7240/ADuM7241
Figure 2. ADuM7241
APPLICATIONS
General-purpose multichannel isolation
Data converter isolation
Industrial field bus isolation
GENERAL DESCRIPTION
The ADuM7240/ADuM72411 are dual 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 ADuM7240/ADuM7241 dual 1 kV digital isolation devices
are packaged in a narrow-body 8-lead SOIC. The ADuM7240/
ADuM7241 offer a cost-effective option compared to 2.5 kV or
5 kV isolators where only functional isolation is needed.
Like other Analog Devices isolators, the ADuM7240/ADuM7241
offer very low power consumption, consuming one-tenth to
one-sixth the power of comparable isolators at data rates up to
25 Mbps. Despite the low power consumption, all models of the
1
ADuM7240/ADuM7241 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 ADuM7240/ADuM7241 provide two independent
isolation channels and are available in two channel configurations with 1 Mbps or 25 Mbps data rates (see the Ordering
Guide). 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. The ADuM7240/
ADuM7241 also have an output default high logic state in the
absence of input power.
Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending.
Rev. A
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.
Trademarks and registered trademarks are the property of their respective owners.
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Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2012 Analog Devices, Inc. All rights reserved.
ADuM7240/ADuM7241
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Absolute Maximum Ratings ............................................................8
Applications ....................................................................................... 1
ESD Caution...................................................................................8
Functional Block Diagrams ............................................................. 1
Pin Configurations and Function Descriptions ............................9
General Description ......................................................................... 1
Typical Performance Characteristics ........................................... 10
Revision History ............................................................................... 2
Applications Information .............................................................. 12
Specifications..................................................................................... 3
Printed Circuit Board Layout ................................................... 12
Electrical Characteristics—5 V Operation................................ 3
Propagation Delay-Related Parameters................................... 12
Electrical Characteristics—3.3 V Operation ............................ 4
DC Correctness .......................................................................... 12
Electrical Characteristics—Mixed 5 V/3.3 V Operation ........ 5
Magnetic Field Immunity.......................................................... 12
Electrical Characteristics—Mixed 3.3 V/5 V Operation ........ 6
Power Consumption .................................................................. 13
Package Characteristics ............................................................... 7
Insulation Lifetime ..................................................................... 13
Regulatory Information ............................................................... 7
Outline Dimensions ....................................................................... 14
Insulation and Safety-Related Specifications ............................ 7
Ordering Guide .......................................................................... 14
Recommended Operating Conditions ...................................... 7
REVISION HISTORY
5/12—Rev. 0 to Rev. A
Changes to Table 2, Changed IDDI(Q) Maximum Parameter from
1.2 mA to 1.4 mA (Table 3), and Changed IDDO(Q) Maximum
Parameter from 0.95 mA to 1.1 mA (Table 3) .............................. 3
Changes to Table 5, Changed IDDI(Q) Maximum Parameter from
0.83 mA to 1.0 mA (Table 6), and Changed IDDO(Q) Maximum
Parameter from 0.68 mA to 0.8 mA (Table 6) .............................. 4
Changes to Table 8, Changed IDDI(Q) Maximum Parameter from
1.2 mA to 1.45 mA (Table 9), and Changed IDDO(Q) Maximum
Parameter from 0.67 mA to 0.80 mA (Table 9) ............................ 5
Changes to Table 11, Changed IDDI(Q) Maximum Parameter from
0.83 mA to 1.0 mA (Table 12), and Changed IDDO(Q) Maximum
Parameter from 0.90 mA to 1.1 mA (Table 12) ............................ 6
5/12—Revision 0: Initial Version
Rev. A | Page 2 of 16
Data Sheet
ADuM7240/ADuM7241
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—5 V OPERATION
All typical specifications are at TA = 25°C, VDD1 = VDD2 = 5 V. Minimum/maximum specifications apply over the entire recommended
operation range of 4.5 V ≤ VDD1 ≤ 5.5 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 1.
Parameter
SWITCHING SPECIFICATIONS
Pulse Width
Data Rate
Propagation Delay
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew 1
Channel Matching
Codirectional
Opposing Direction
Jitter
1
Symbol
Min
PW
250
A Grade
Typ
Max
Min
C Grade
Typ
Max
40
tPHL, tPLH
PWD
1
75
25
50
10
5
tPSK
20
tPSKCD
tPSKOD
25
30
32
41
2
3
25
50
5
10
2
2
2
2
4
6
Unit
Test Conditions/Comments
ns
Mbps
ns
ns
ps/°C
ns
Within PWD limit
Within PWD limit
50% input to 50% output
|tPLH − tPHL|
ns
ns
ns
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 2.
Parameter
SUPPLY CURRENT
ADuM7240
ADuM7241
Symbol
Min
1 Mbps—A, C Grades
Typ
Max
IDD1
IDD2
IDD1
IDD2
2.2
1.7
1.9
1.9
25 Mbps—C Grade
Min
Typ
Max
2.8
2.2
2.4
2.4
16
3.9
9.3
8.2
21
5.7
13
12
Unit
Test Conditions/Comments
mA
mA
mA
mA
Table 3. For All Models
Parameter
DC SPECIFICATIONS
Logic High Input Threshold
Logic Low Input Threshold
Logic High Output Voltages
Symbol
Min
VIH
VIL
VOH
0.7 VDDx
Logic Low Output Voltages
VOL
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 Immunity 1
Refresh Rate
1
II
fr
Max
0.3 VDDx
VDDx − 0.1
VDDx − 0.4
−10
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
tR/tF
|CM|
Typ
VDDx
VDDx − 0.3
0.0
0.2
+0.01
1
0.8
0.29
0.03
15
0.1
0.4
+10
1.4
1.1
Unit
Test Conditions/Comments
V
V
V
V
V
V
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
mA
mA
mA/Mbps
mA/Mbps
2.0
25
ns
kV/µs
600
kHz
10% to 90%
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
DC data inputs
|CM| is the maximum common-mode voltage slew rate that can be sustained while maintaining VO > 0.8 VDDx. The common-mode voltage slew rates apply to both
rising and falling common-mode voltage edges.
Rev. A | Page 3 of 16
ADuM7240/ADuM7241
Data Sheet
ELECTRICAL CHARACTERISTICS—3.3 V OPERATION
All typical specifications are at TA = 25°C, VDD1 = VDD2 = 3.3 V. Minimum/maximum specifications apply over the entire recommended
operation range of 3.0 V ≤ VDD1 ≤ 3.6 V, 3.0 V ≤ VDD2 ≤ 3.6 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 4.
Parameter
SWITCHING SPECIFICATIONS
Pulse Width
Data Rate
Propagation Delay
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew 1
Channel Matching
Codirectional
Opposing Direction
Jitter
1
Symbol
Min
PW
250
tPHL, tPLH
PWD
A Grade
Typ
Max
C Grade
Typ
Max
Min
40
1
85
25
60
10
5
tPSK
20
tPSKCD
tPSKOD
25
30
37
50
2
3
25
64
5
10
2
2
2
2
4
7
Unit
Test Conditions/Comments
ns
Mbps
ns
ns
ps/°C
ns
Within PWD limit
Within PWD limit
50% input to 50% output
|tPLH − tPHL|
ns
ns
ns
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 5.
Parameter
SUPPLY CURRENT
ADuM7240
ADuM7241
Symbol
Min
1 Mbps—A, C Grades
Typ
Max
IDD1
IDD2
IDD1
IDD2
1.6
1.3
1.4
1.4
Min
25 Mbps—C Grade
Typ
Max
2.0
1.6
1.8
1.8
12
2.6
6.7
5.9
15
4.4
9.2
8.2
Unit
Test Conditions/Comments
mA
mA
mA
mA
Table 6. For All Models
Parameter
DC SPECIFICATIONS
Logic High Input Threshold
Logic Low Input Threshold
Logic High Output Voltages
Symbol
Min
VIH
VIL
VOH
0.7 VDDx
Logic Low Output Voltages
VOL
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 Immunity 1
Refresh Rate
1
II
fr
Max
0.3 VDDx
VDDx − 0.2
VDDx − 0.4
−10
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
tR/tF
|CM|
Typ
VDDx
VDDx − 0.3
0.0
0.2
+0.01
0.71
0.59
0.20
0.02
15
0.1
0.4
+10
1.0
0.8
Unit
Test Conditions/Comments
V
V
V
V
V
V
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
mA
mA
mA/Mbps
mA/Mbps
2.8
25
ns
kV/µs
550
kHz
10% to 90%
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
DC data inputs
|CM| is the maximum common-mode voltage slew rate that can be sustained while maintaining VO > 0.8 VDDx. The common-mode voltage slew rates apply to both
rising and falling common-mode voltage edges.
Rev. A | Page 4 of 16
Data Sheet
ADuM7240/ADuM7241
ELECTRICAL CHARACTERISTICS—MIXED 5 V/3.3 V OPERATION
All typical specifications are at TA = 25°C, VDD1 = 5 V, VDD2 = 3.3 V. Minimum/maximum specifications apply over the entire recommended operation range of 4.5 V ≤ VDD1 ≤ 5.5 V, 3.0 V ≤ VDD2 ≤ 3.6 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 7.
Parameter
SWITCHING SPECIFICATIONS
Pulse Width
Data Rate
Propagation Delay
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew 1
Channel Matching
Codirectional
Opposing Direction
Jitter
1
Symbol
Min
PW
250
tPHL, tPLH
PWD
A Grade
Typ
Max
C Grade
Typ
Max
Min
40
1
80
25
55
10
5
tPSK
20
tPSKCD
tPSKOD
25
30
34
44
2
3
25
54
5
10
2
3
2
2
5
9
Unit
Test Conditions/Comments
ns
Mbps
ns
ns
ps/°C
ns
Within PWD limit
Within PWD limit
50% input to 50% output
|tPLH − tPHL|
ns
ns
ns
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 8.
Parameter
SUPPLY CURRENT
ADuM7240
ADuM7241
Symbol
1 Mbps—A, C Grades
Min
Typ
Max
IDD1
IDD2
IDD1
IDD2
2.2
1.3
1.9
1.4
25 Mbps—C Grade
Min
Typ
Max
2.9
1.6
2.3
1.6
16
2.8
9.2
5.9
Unit
21
3.6
12
7.2
Test Conditions/Comments
mA
mA
mA
mA
Table 9. For All Models
Parameter
DC SPECIFICATIONS
Logic High Input Threshold
Logic Low Input Threshold
Logic High Output Voltages
Symbol
Min
VIH
VIL
VOH
0.7 VDDx
Logic Low Output Voltages
VOL
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 Immunity 1
Refresh Rate
1
II
fr
Max
0.3 VDDx
VDDx − 0.1
VDDx− 0.4
−10
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
tR/tF
|CM|
Typ
VDDx
VDDx − 0.3
0.0
0.2
+0.01
1.0
0.59
0.25
0.02
15
0.1
0.4
+10
1.45
0.80
Unit
Test Conditions/Comments
V
V
V
V
V
V
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
mA
mA
mA/Mbps
mA/Mbps
2.5
25
ns
kV/µs
600
kHz
10% to 90%
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
DC data inputs
|CM| is the maximum common-mode voltage slew rate that can be sustained while maintaining VO > 0.8 VDDx. The common-mode voltage slew rates apply to both
rising and falling common-mode voltage edges.
Rev. A | Page 5 of 16
ADuM7240/ADuM7241
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
Pulse Width
Data Rate
Propagation Delay
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew 1
Channel Matching
Codirectional
Opposing Direction
Jitter
1
Symbol
Min
PW
250
A Grade
Typ
Max
Min
C Grade
Typ
Max
40
tPHL, tPLH
PWD
1
80
25
55
10
5
tPSK
20
tPSKCD
tPSKOD
25
30
35
47
2
3
25
59
5
10
2
5
2
2
5
10
Unit
Test
Conditions/Comments
ns
Mbps
ns
ns
ps/°C
ns
Within PWD limit
Within PWD limit
50% input to 50% output
|tPLH − tPHL|
ns
ns
ns
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.
Parameter
SUPPLY CURRENT
ADuM7240
ADuM7241
Symbol
1 Mbps—A, C Grades
Typ
Max
Min
1.6
1.7
1.4
1.9
IDD1
IDD2
IDD1
IDD2
25 Mbps—C Grade
Min
Typ
Max
2.0
2.1
1.6
2.3
12
3.8
6.8
8.2
15
4.8
8.2
10.2
Unit
Test Conditions
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 Immunity 1
Refresh Rate
1
Symbol
Min
VIH
VIL
VOH
0.7 VDDx
VDDx − 0.1
VDDx − 0.4
−10
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
tR/tF
|CM|
fr
Max
0.3 VDDx
VOL
II
Typ
VDDx
VDDx − 0.3
0.0
0.2
+0.01
0.71
0.80
0.20
0.03
15
0.1
0.4
+10
1.0
1.1
Unit
Test Conditions
V
V
V
V
V
V
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
mA
mA
mA/Mbps
mA/Mbps
2.5
25
ns
kV/µs
550
kHz
10% to 90%
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
DC data inputs
|CM| is the maximum common-mode voltage slew rate that can be sustained while maintaining VO > 0.8 VDDx. The common-mode voltage slew rates apply to both
rising and falling common-mode voltage edges.
Rev. A | Page 6 of 16
Data Sheet
ADuM7240/ADuM7241
PACKAGE CHARACTERISTICS
Table 13.
Parameter
Resistance (Input-to-Output) 1
Capacitance (Input-to-Output)1
Input Capacitance 2
IC Junction-to-Ambient Thermal
Resistance
1
2
Symbol
RI-O
CI-O
CI
θJA
Min
Typ
1013
2
4
85
Max
Unit
Ω
pF
pF
°C/W
Test Conditions/Comments
f = 1 MHz
Thermocouple located at center of package
underside
The device is considered a 2-terminal device: Pin 1 through Pin 4 are shorted together, and Pin 5 through Pin 8 are shorted together.
Input capacitance is from any input data pin to ground.
REGULATORY INFORMATION
The ADuM7240/ADuM7241 are pending approval by the organizations listed in Table 14. See Table 18 and the Insulation Lifetime
section for recommended maximum working voltages for specific cross-isolation waveforms and insulation levels.
Table 14.
UL (Pending)
Recognized Under UL 1577 Component Recognition Program 1
Single Protection, 1000 V rms Isolation Voltage
File E274400
1
In accordance with UL 1577, each ADuM7240/ADuM7241 is proof tested by applying an insulation test voltage ≥1200 V rms for 1 sec (current leakage detection limit = 5 µA).
INSULATION AND SAFETY-RELATED SPECIFICATIONS
Table 15.
Parameter
Rated Dielectric Insulation Voltage
Minimum External Air Gap (Clearance)
Symbol
L(I01)
Value
1000
4.0
Unit
V rms
mm min
Minimum External Tracking (Creepage)
L(I02)
4.0
mm min
Minimum Internal Gap (Internal Clearance)
Tracking Resistance (Comparative Tracking Index)
Isolation Group
CTI
2.6
>175
IIIa
μm min
V
RECOMMENDED OPERATING CONDITIONS
300
Table 16.
250
Parameter
Operating Temperature
Supply Voltages 1
Input Signal Rise and Fall Times
200
150
1
100
50
0
0
50
100
150
AMBIENT TEMPERATURE (°C)
Symbol
TA
VDD1, VDD2
Min
−40
3.0
Max
+105
5.5
1.0
All voltages are relative to their respective ground. See the DC Correctness
section for information about immunity to external magnetic fields.
10240-003
SAFETY-LIMITING CURRENT (mA)
Test Conditions/Comments
1-minute duration
Measured from input terminals to output terminals,
shortest distance through air
Measured from input terminals to output terminals,
shortest distance path along body
Distance through insulation
DIN IEC 112/VDE 0303 Part 1
Material Group (DIN VDE 0110, 1/89, Table 1)
200
Figure 3. Thermal Derating Curve, Dependence of Safety-Limiting Values
with Ambient Temperature per DIN V VDE V 0884-10
Rev. A | Page 7 of 16
Unit
°C
V
ms
ADuM7240/ADuM7241
Data Sheet
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Table 17.
Parameter
Storage Temperature (TST) Range
Ambient Operating Temperature
(TA) Range
Supply Voltages (VDD1, VDD2)
Input Voltages (VIA, VIB)1
Output Voltages (VOA, VOB)1
Average Output Current per Pin2
Side 1 (IO1)
Side 2 (IO2)
Common-Mode Transients3
Rating
−65°C to +150°C
−40°C to +105°C
−0.5 V to +7.0 V
−0.5 V to VDDI + 0.5 V
−0.5 V to VDDO + 0.5 V
ESD CAUTION
−10 mA to +10 mA
−10 mA to +10 mA
−100 kV/µs to +100 kV/µs
VDDI and VDDO refer to the supply voltages on the input and output sides of a
given channel, respectively. See the Printed Circuit Board Layout section.
2
See Figure 3 for maximum rated current values for various temperatures.
3
Refers to common-mode transients across the insulation barrier. Commonmode transients exceeding the absolute maximum ratings may cause latchup or permanent damage.
1
Table 18. Maximum Continuous Working Voltage 1
Parameter
AC Voltage, Bipolar Waveform
DC Voltage
1
Max
300
300
Unit
V rms
V dc
Constraint
50-year minimum lifetime
50-year minimum lifetime
Refers to continuous voltage magnitude imposed across the isolation barrier. See the Insulation Lifetime section for more details.
Table 19. ADuM7240 Truth Table (Positive Logic) 1
VIA Input
H
L
H
L
X
VIB Input
H
L
L
H
X
VDD1 State
Powered
Powered
Powered
Powered
Unpowered
VDD2 State
Powered
Powered
Powered
Powered
Powered
VOA Output
H
L
H
L
H
VOB Output
H
L
L
H
H
X
X
Powered
Unpowered
Indeterminate
Indeterminate
1
Notes
Outputs return to the input state within
1 µs of VDDI power restoration.
Outputs return to the input state within
1 µs of VDDO power restoration.
H = high, L = low, X = don’t care.
Table 20. ADuM7241 Truth Table (Positive Logic) 1
VIA Input
H
L
H
L
X
VIB Input
H
L
L
H
X
VDD1 State
Powered
Powered
Powered
Powered
Unpowered
VDD2 State
Powered
Powered
Powered
Powered
Powered
VOA Output
H
L
H
L
Indeterminate
VOB Output
H
L
L
H
H
X
X
Powered
Unpowered
H
Indeterminate
1
H = high, L = low, X = don’t care.
Rev. A | Page 8 of 16
Notes
Outputs return to the input state within
1 µs of VDDI power restoration.
Outputs return to the input state within
1 µs of VDDO power restoration.
Data Sheet
ADuM7240/ADuM7241
VDD1 1
VIA 2
VIB 3
ADuM7240
TOP VIEW
(Not to Scale)
GND1 4
8
VDD2
7
VOA
6
VOB
5
GND2
10240-004
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Figure 4. ADuM7240 Pin Configuration
Table 21. ADuM7240 Pin Function Descriptions
Mnemonic
VDD1
VIA
VIB
GND1
GND2
VOB
VOA
VDD2
Description
3.0 V to 5.5 V Supply Voltage for Isolator Side 1.
Logic Input A.
Logic Input B.
Ground 1. Ground reference for Isolator Side 1.
Ground 2. Ground reference for Isolator Side 2.
Logic Output B.
Logic Output A.
3.0 V to 5.5 V Supply Voltage for Isolator Side 2.
VDD1 1
VOA 2
VIB 3
GND1 4
ADuM7241
TOP VIEW
(Not to Scale)
8
VDD2
7
VIA
6
VOB
5
GND2
10240-005
Pin No.
1
2
3
4
5
6
7
8
Figure 5. ADuM7241 Pin Configuration
Table 22. ADuM7241 Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
Mnemonic
VDD1
VOA
VIB
GND1
GND2
VOB
VIA
VDD2
Description
3.0 V to 5.5 V Supply Voltage for Isolator Side 1.
Logic Output A.
Logic Input B.
Ground 1. Ground reference for Isolator Side 1.
Ground 2. Ground reference for Isolator Side 2.
Logic Output B.
Logic Input A.
3.0 V to 5.5 V Supply Voltage for Isolator Side 2.
Rev. A | Page 9 of 16
ADuM7240/ADuM7241
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
10
20
8
CURRENT (mA)
CURRENT (mA)
15
6
5V
4
10
5V
3V
5
3V
0
0
5
10
15
20
25
10240-009
10240-006
2
0
0
30
5
10
15
20
25
30
DATA RATE (Mbps)
DATA RATE (Mbps)
Figure 6. Typical Supply Current per Input Channel vs. Data Rate
for 5 V and 3 V Operation
Figure 9. Typical ADuM7240 VDD1 Supply Current vs. Data Rate
for 5 V and 3 V Operation
4
5
4
CURRENT (mA)
CURRENT (mA)
3
2
5V
3
5V
2
1
3V
10240-007
0
0
5
10
15
20
25
10240-010
1
3V
0
30
0
5
DATA RATE (Mbps)
10
15
20
25
30
DATA RATE (Mbps)
Figure 7. Typical Supply Current per Output Channel vs. Data Rate
for 5 V and 3 V Operation (No Output Load)
Figure 10. Typical ADuM7240 VDD2 Supply Current vs. Data Rate
for 5 V and 3 V Operation
4
10
8
CURRENT (mA)
CURRENT (mA)
3
5V
2
6
5V
4
3V
1
3V
0
0
5
10
15
20
25
10240-011
10240-008
2
0
30
0
DATA RATE (Mbps)
5
10
15
20
25
30
DATA RATE (Mbps)
Figure 8. Typical Supply Current per Output Channel vs. Data Rate
for 5 V and 3 V Operation (15 pF Output Load)
Figure 11. Typical ADuM7241 VDD1 Supply Current vs. Data Rate
for 5 V and 3 V Operation
Rev. A | Page 10 of 16
Data Sheet
ADuM7240/ADuM7241
10
6
5V
4
3V
2
10240-012
CURRENT (mA)
8
0
0
5
10
15
20
25
30
DATA RATE (Mbps)
Figure 12. Typical ADuM7241 VDD2 Supply Current vs. Data Rate
for 5 V and 3 V Operation
Rev. A | Page 11 of 16
ADuM7240/ADuM7241
Data Sheet
APPLICATIONS INFORMATION
PRINTED CIRCUIT BOARD LAYOUT
The ADuM7240/ADuM7241 digital isolators require no
external interface circuitry for the logic interfaces. Power supply
bypassing is strongly recommended at both input and output
supply pins: VDD1 and VDD2. The capacitor value should be
between 0.01 µF and 0.1 µF. The total lead length between both
ends of the capacitor and the input power supply pin should not
exceed 20 mm.
In applications involving high common-mode transients, it is
important to minimize board coupling across the isolation barrier.
Furthermore, users should design the board layout so that any
coupling that does occur affects all pins on a given component
side equally. Failure to ensure this can cause voltage differentials
between pins exceeding the absolute maximum ratings of the
device, thereby leading to latch-up or permanent damage.
With proper PCB design choices, the ADuM7240/ADuM7241
can readily meet CISPR 22 Class A (and FCC Class A)
emissions standards, as well as the more stringent CISPR 22
Class B (and FCC Class B) standards in an unshielded
environment. Refer to AN-1109 for PCB-related EMI mitigation
techniques, including board layout and stack-up issues.
PROPAGATION DELAY-RELATED PARAMETERS
Propagation delay is a parameter that describes the time it takes
a logic signal to propagate through a component. The input-tooutput propagation delay time for a high-to-low transition may
differ from the propagation delay time for a low-to-high
transition.
INPUT (VIx)
50%
tPHL
OUTPUT (VOx)
50%
10240-013
tPLH
Figure 13. Propagation Delay Parameters
Pulse width distortion is the maximum difference between
these two propagation delay values and is an indication of how
accurately the timing of the input signal is preserved.
Channel-to-channel matching refers to the maximum amount
that the propagation delay differs between channels within a
single ADuM7240/ADuM7241 component.
Propagation delay skew refers to the maximum amount the
propagation delay differs between multiple ADuM7240/
ADuM7241 components operating under the same conditions.
DC CORRECTNESS
Positive and negative logic transitions at the isolator input
cause narrow (~1 ns) pulses to be sent to the decoder via the
transformer. The decoder is bistable and is, therefore, either set
or reset by the pulses, indicating input logic transitions. In the
absence of logic transitions at the input for more than ~1 µs, a
periodic set of refresh pulses indicative of the correct input state
is sent to ensure dc correctness at the output. If the decoder
receives no internal pulses for more than approximately 5 µs,
the input side is assumed to be unpowered or nonfunctional,
and the isolator output is forced to a default high state by the
watchdog timer circuit.
MAGNETIC FIELD IMMUNITY
The magnetic field immunity of the ADuM7240/ADuM7241 is
determined by the changing magnetic field, which induces a
voltage in the transformer’s receiving coil large enough to either
falsely set or reset the decoder. The following analysis defines
the conditions under which this can occur. The 3 V operating
condition of the ADuM7240/ADuM7241 is examined because
it represents the most susceptible mode of operation.
The pulses at the transformer output have an amplitude greater
than 1.0 V. The decoder has a sensing threshold at about 0.5 V, thus
establishing a 0.5 V margin in which induced voltages can be
tolerated. The voltage induced across the receiving coil is given by
V = (−dβ/dt) ∑ π rn2; n = 1, 2, … , N
where:
β is the magnetic flux density (gauss).
rn is the radius of the nth turn in the receiving coil (cm).
N is the number of turns in the receiving coil.
Given the geometry of the receiving coil in the ADuM7240/
ADuM7241 and an imposed requirement that the induced
voltage be, at most, 50% of the 0.5 V margin at the decoder, a
maximum allowable magnetic field at a given frequency can be
calculated. The result is shown in Figure 14.
Rev. A | Page 12 of 16
ADuM7240/ADuM7241
Note that with extreme combinations of strong magnetic field
and high frequency current, loops formed by printed circuit
board traces can induce error voltages large enough to trigger
the thresholds of receiver circuitry. Care should be taken in the
layout of such traces to avoid this possibility.
1000
100
10
POWER CONSUMPTION
1
The supply current at a given channel of the ADuM7240/
ADuM7241 isolator is a function of the supply voltage, the
data rate of the channel, and the output load of the channel.
0.1
0.01
0.001
1k
10240-014
MAXIMUM ALLOWABLE MAGNETIC FLUX (kgauss)
Data Sheet
10M
10k
100k
1M
MAGNETIC FIELD FREQUENCY (Hz)
100M
Figure 14. Maximum Allowable External Magnetic Flux Density
For example, at a magnetic field frequency of 1 MHz, the
maximum allowable magnetic field of 0.5 kgauss induces a
voltage of 0.25 V at the receiving coil. This voltage is about 50%
of the sensing threshold and does not cause a faulty output
transition. Similarly, if such an event occurs during a transmitted pulse (and is of the worst-case polarity), it reduces the
received pulse from >1.0 V to 0.75 V, still well above the 0.5 V
sensing threshold of the decoder.
The preceding magnetic flux density values correspond to
specific current magnitudes at given distances from the
ADuM7240/ADuM7241 transformers. Figure 15 shows these
allowable current magnitudes as a function of frequency for
selected distances. As shown in Figure 15, the ADuM7240/
ADuM7241 is extremely immune and can be affected only by
extremely large currents operated at high frequency very close
to the component. For the 1 MHz example, a 1.2 kA current
placed 5 mm away from the ADuM7240/ADuM7241 is
required to affect the operation of the component.
100
10
IDDI = IDDI(Q)
f ≤ 0.5 fr
IDDI = IDDI(D) × (2f − fr) + IDDI(Q)
f > 0.5 fr
For each output channel, the supply current is given by
IDDO = IDDO(Q)
f ≤ 0.5 fr
IDDO = (IDDO(D) + (0.5 × 10 ) × CL × VDDO) × (2f − fr) + IDDO(Q)
f > 0.5 fr
−3
where:
IDDI(D), IDDO(D) are the input and output dynamic supply currents
per channel (mA/Mbps).
CL is the output load capacitance (pF).
VDDO is the output supply voltage (V).
f is the input logic signal frequency (MHz); it is half the input
data rate, expressed in units of Mbps.
fr is the input stage refresh rate (Mbps).
IDDI(Q), IDDO(Q) are the specified input and output quiescent
supply currents (mA).
To calculate the total VDD1 and VDD2 supply current, the supply
currents for each input and output channel corresponding to
VDD1 and VDD2 are calculated and totaled. Figure 6 and Figure 7
show per-channel supply currents as a function of data rate for
an unloaded output condition. Figure 8 shows the per-channel
supply current as a function of data rate for a 15 pF output
condition. Figure 9 through Figure 12 show the total VDD1 and
VDD2 supply current as a function of data rate for ADuM7240
and ADuM7241 channel configurations.
INSULATION LIFETIME
1
0.1
DISTANCE = 5mm
DISTANCE = 100mm
DISTANCE = 1m
1k
10k
10M
100k
1M
MAGNETIC FIELD FREQUENCY (Hz)
Figure 15. Maximum Allowable Current for Various
Current-to-ADuM7240/ADuM7241 Spacings
10240-015
MAXIMUM ALLOWABLE CURRENT (kA)
1000
0.01
For each input channel, the supply current is given by
100M
All insulation structures eventually break down when subjected
to voltage stress over a sufficiently long period. The rate of
insulation degradation is dependent on the characteristics of
the voltage waveform applied across the insulation. In addition
to the testing performed by the regulatory agencies, Analog
Devices carries out an extensive set of evaluations to determine
the lifetime of the insulation structure within the ADuM7240/
ADuM7241.
Analog Devices performs accelerated life testing using voltage
levels higher than the rated continuous working voltage. Acceleration factors for several operating conditions are determined.
These factors allow calculation of the time to failure at the
actual working voltage. The values shown in Table 18 summarize the working voltage for 50 years of service life.
Rev. A | Page 13 of 16
ADuM7240/ADuM7241
Data Sheet
OUTLINE DIMENSIONS
5.00 (0.1968)
4.80 (0.1890)
1
5
4
1.27 (0.0500)
BSC
0.25 (0.0098)
0.10 (0.0040)
6.20 (0.2441)
5.80 (0.2284)
1.75 (0.0688)
1.35 (0.0532)
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
SEATING
PLANE
0.50 (0.0196)
0.25 (0.0099)
45°
8°
0°
0.25 (0.0098)
0.17 (0.0067)
1.27 (0.0500)
0.40 (0.0157)
COMPLIANT TO JEDEC STANDARDS MS-012-AA
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
012407-A
8
4.00 (0.1574)
3.80 (0.1497)
Figure 16. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body (R-8)
Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model 1
ADuM7240ARZ
ADuM7240ARZ-RL7
No. of Inputs,
VDD1 Side
2
2
No. of Inputs,
VDD2 Side
0
0
Maximum
Data Rate
1 Mbps
1 Mbps
Maximum
Propagation
Delay, 5 V
75 ns
75 ns
Temperature
Range
−40°C to +105°C
−40°C to +105°C
ADuM7240CRZ
ADuM7240CRZ-RL7
2
2
0
0
25 Mbps
25 Mbps
50 ns
50 ns
−40°C to +105°C
−40°C to +105°C
ADuM7241ARZ
ADuM7241ARZ-RL7
1
1
1
1
1 Mbps
1 Mbps
75 ns
75 ns
−40°C to +105°C
−40°C to +105°C
ADuM7241CRZ
ADuM7241CRZ-RL7
1
1
1
1
25 Mbps
25 Mbps
50 ns
50 ns
−40°C to +105°C
−40°C to +105°C
1
Z = RoHS Compliant Part.
Rev. A | Page 14 of 16
Package Description
8-Lead SOIC_N
8-Lead SOIC_N, 7” Tape
and Reel
8-Lead SOIC_N
8-Lead SOIC_N, 7” Tape
and Reel
8-Lead SOIC_N
8-Lead SOIC_N, 7” Tape
and Reel
8-Lead SOIC_N
8-Lead SOIC_N, 7” Tape
and Reel
Package
Option
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
Data Sheet
ADuM7240/ADuM7241
NOTES
Rev. A | Page 15 of 16
ADuM7240/ADuM7241
Data Sheet
NOTES
©2012 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D10240-0-5/12(A)
Rev. A | Page 16 of 16