3 kV RMS Dual Channel Digital Isolators
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
FEATURES
Up to 100 Mbps data rate (NRZ)
Low propagation delay: 20 ns typical
Low dynamic power consumption
Bidirectional communication
3 V to 5 V level translation
High temperature operation: 125°C
High common-mode transient immunity: >25 kV/μs
Default high output: ADuM1280/ADuM1281
Default low output: ADuM1285/ADuM1286
Narrow body, RoHS-compliant, 8-lead SOIC
Safety and regulatory approvals
UL recognition: 3000 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice 5A
VDE Certificate of Conformity
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
VIORM = 560 V peak
Qualified for automotive applications
APPLICATIONS
General-purpose multichannel isolation
Data converter isolation
Industrial field bus isolation
Hybrid electric vehicles, battery monitor, and motor drive
FUNCTIONAL BLOCK DIAGRAMS
ENCODE DECODE
ENCODE DECODE
V
DD1
V
IA
V
IB
GND
1
V
DD2
V
OA
V
OB
GND
2
1
2
3
4
8
7
6
5
ADuM1280/
ADuM1285
10444-001
Figure 1. ADuM1280/ADuM1285
ENCODE DECODE
DECODE ENCODE
VDD1
VOA
VIB
GND1
VDD2
VIA
VOB
GND2
1
2
3
4
8
7
6
5
ADuM1281/
ADuM1286
10444-002
Figure 2. ADuM1281/ADuM1286
GENERAL DESCRIPTION
The ADuM1280/ADuM1281/ADuM1285/ADuM12861 are dual-
channel digital isolators based on the Analog Devices, Inc.,
iCoupler® technology. Combining high speed CMOS and
monolithic air core transformer technology, these isolation
components provide outstanding performance characteristics
superior to alternatives, such as optocoupler devices and other
integrated couplers.
With propagation delay at 20 ns, pulse width distortion is less than
2 ns for C grade. Channel-to-channel matching is tight at 5 ns for
C grade. The two channels of the ADuM1280/ADuM1281/
ADuM1285/ADuM1286 are independent isolation channels and
are available in two channel configurations with three different data
rates up to 100 Mbps (see the Ordering Guide). Industrial grade
models operate with the supply voltage on either side ranging from
3.0 V to 5.5 V and the automotive grades operate from 3.0 V to
5.5 V, providing compatibility with lower voltage systems as well as
enabling a voltage translation functionality across the isolation
barrier. Unlike other optocoupler alternatives, the ADuM1280/
ADuM1281/ADuM1285/ADuM1286 isolators have a patented
refresh feature that ensures dc correctness in the absence of input
logic transitions. When power is first applied or is not yet applied
to the input side, the ADuM1280 and ADuM1281 have a default
high output, and the ADuM1285 and ADuM1286 have a default
low output.
For more information on safety and regulatory approvals, go to
www.analog.com/icouplersafety.
1 Protected by U.S. Patents 5,952,849; 6,873,065; 6,903,578; and 7,075,329. Other patents are pending.
Rev. C Document Feedback
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ADuM1280/ADuM1281/ADuM1285/ADuM1286 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagrams ............................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Electrical Characteristics—5 V Operation (All Grades) ......... 3
Electrical Characteristics—3 V Operation (A, B, and C
Grades) ........................................................................................... 4
Electrical Characteristics—Mixed 5 V/3 V Operation (A, B,
and C Grades) ............................................................................... 5
Electrical Characteristics—Mixed 3 V/5 V Operation (A, B,
and C Grades) ............................................................................... 7
Electrical Characteristics—3 V Operation (WA, WB, and WC
Grades) ........................................................................................... 8
Electrical Characteristics—Mixed 5 V/3 V Operation (WA,
WB, and WC Grades) .................................................................. 9
Electrical Characteristics—Mixed 3 V/5 V Operation (WA,
WB, and WC Grades) ................................................................ 11
Package Characteristics ............................................................. 12
Regulatory Information ............................................................... 12
Insulation and Safety-Related Specifications .............................. 12
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
Insulation Characteristics ......................................................... 13
Recommended Operating Conditions .................................... 13
Absolute Maximum Ratings ......................................................... 14
ESD Caution ................................................................................. 14
Pin Configuration and Function Descriptions ........................... 15
Typical Performance Characteristics ........................................... 17
Applications Information .............................................................. 18
PC Board Layout ........................................................................ 18
Propagation Delay-Related Parameters ................................... 18
DC Correctness and Magnetic Field Immunity ..................... 18
Power Consumption .................................................................. 19
Insulation Lifetime ..................................................................... 20
Outline Dimensions ....................................................................... 21
Ordering Guide .......................................................................... 21
Automotive Products ................................................................... 21
REVISION HISTORY
7/15—Rev. A to Rev. B
Change to General Description Section ........................................ 1
Changed 2.7 V ≤ VDDX ≤ 3.6 V to 3.0 V ≤ VDDX ≤ 3.6 V .............. 4
Changed 2.7 V ≤ VDD2 ≤ 3.6 V to 3.0 V ≤ VDD2 ≤ 3.6 V ............... 5
Changed 2.7 V ≤ VDD1 ≤ 3.6 V to 3.0 V ≤ VDD1 ≤ 3.6 V ............... 7
Change to Table 26 ......................................................................... 13
Changes to Table 29 and Table 30 ................................................ 15
3/14—Re v. A to Rev. B
Change to Features ........................................................................... 1
Changes to Regulatory Information Section and Table 23 ....... 10
Changes to Table 24 ........................................................................ 10
3/13—Re v. 0 to Rev. A
Changes to Features Section, Applications Section, and General
Description Section ................................................................................... 1
Added Table 13 to Table 21; Renumbered Sequentially ..................... 7
Changes to Table 26 ................................................................................. 11
Changes to Table 29 and Table 30 ......................................................... 13
Changes to Ordering Guide ................................................................... 19
Added Automotive Products Section .................................................. 19
5/12—Revision 0: Initial Version
Rev. C | Page 2 of 22
Data Sheet ADuM1280/ADuM1281/ADuM1285/ADuM1286
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—5 V OPERATION (ALL GRADES)
All typical specifications are at TA = 25°C, VDD1 = VDD2 = 5 V. Minimum/maximum specifications apply over the entire recommended operation
range: 4.5 V ≤ VDD1 ≤ 5.5 V, 4.5 V ≤ VDD2 ≤ 5 . 5 V, −40°C ≤ TA ≤ 125°C, unless otherwise noted. Switching specifications are tested with CL = 15 pF
and CMOS signal levels, unless otherwise noted.
Table 1.
A, WA Grades B, WB Grades C, WC Grades
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Unit Test Conditions
SWITCHING SPECIFICATIONS
Pulse Width PW 1000 40 10 ns Within PWD limit
Data Rate 1 25 100 Mbps Within PWD limit
Propagation Delay tPHL, tPLH 50 35 13 18 24 ns 50% input to 50%
output
Pulse Width Distortion
PWD
3
ns
|t
PLH
− t
PHL
|
Change vs. Temperature 7 3 1.5 ps/°C
Propagation Delay Skew tPSK 38 12 9 ns Between any
two units at same
operating conditions
Channel Matching1
Codirectional
t
PSKCD
3
ns
Opposing-Direction tPSKOD 10 6 5 ns
Jitter 2 2 1 ns
1 Codirectional channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on the same side of the isolation
barrier. Opposing-direction channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on opposing sides
of the isolation barrier.
Table 2.
Parameter Symbol
1 Mbps–
A, B, C,WA, WB,
WC Grades
25 Mbps–B, C, WB,
WC Grades
100 Mbps–C, WC
Grades
Unit Test Conditions
Min Typ Max Min Typ Max Min Typ Max
SUPPLY CURRENT No load
ADuM1280/ADuM1285 IDD1 1.1 1.6 6.2 7.0 20 25 mA
IDD2 2.7 4.5 4.8 7.0 9.5 15 mA
ADuM1281/ADuM1286 IDD1 2.1 2.6 4.9 6.0 15 19 mA
IDD2 2.3 2.9 4.7 6.4 15.6 19 mA
Table 3. For All Models
Parameter Symbol Min Typ Max Unit Test Conditions
DC SPECIFICATIONS
Logic High Input Threshold VIH 0.7 VDDx V
Logic Low Input Threshold VIL 0.3 VDDx V
Logic High Output Voltages VOH VDDx − 0.1 5.0 V IOx = −20 µA, VIx = VIxH
VDDx − 0.4 4.8 V IOx = −4 mA, VIx = VIxH
Logic Low Output Voltages VOL 0.0 0.1 V IOx = 20 µA, VIx = VIxL
0.2 0.4 V IOx = 4 mA, VIx = VIxL
Input Current per Channel
I
I
−10
+0.01
+10
µA
0 V ≤ V
Ix
≤ V
DDx
Supply Current per Channel
Quiescent Input Supply Current IDDI(Q) 0.54 0.8 mA
Quiescent Output Supply Current IDDO(Q) 1.6 2.0 mA
Dynamic Input Supply Current IDDI(D) 0.09 mA/Mbps
Dynamic Output Supply Current IDDO(D) 0.04 mA/Mbps
Rev. C | Page 3 of 22
ADuM1280/ADuM1281/ADuM1285/ADuM1286 Data Sheet
Parameter Symbol Min Typ Max Unit Test Conditions
Undervoltage Lockout
Positive VDDx Threshold VDDXUV+ 2.6 V
Negative VDDx Threshold VDDXUV- 2.4 V
VDDx Hysteresis VDDXUVH 0.2 V
AC SPECIFICATIONS
Output Rise/Fall Time tR/tF 2.5 ns 10% to 90%
Common-Mode Transient Immunity1 |CM| 25 35 kV/µs VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
Refresh Period tr 1.6 µs
1 |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.
ELECTRICAL CHARACTERISTICS—3 V OPERATION (A, B, AND C GRADES)
All typical specifications are at TA = 25°C, VDD1 = VDD2 = 3.0 V. Minimum/maximum specifications apply over the entire recommended operation
range: 3.0 V ≤ VDD1 ≤ 3.6 V, 3.0 V ≤ VDD2 ≤ 3 . 6 V, −40°C ≤ TA ≤ 125°C, unless otherwise noted. Switching specifications are tested with CL = 15 pF
and CMOS signal levels, unless otherwise noted.
Table 4.
A Grade B Grade C Grade
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Unit Test Conditions
SWITCHING SPECIFICATIONS
Pulse Width PW 1000 40 10 ns Within PWD limit
Data Rate 1 25 100 Mbps Within PWD limit
Propagation Delay tPHL, tPLH 50 35 20 25 33 ns 50% input to 50%
output
Pulse Width Distortion PWD 10 3 2.5 ns |tPLH − tPHL|
Change vs. Temperature
7
3
1.5
ps/°C
Propagation Delay Skew tPSK 38 16 12 ns Between any
two units at same
operating conditions
Channel Matching1
Codirectional tPSKCD 5 3 2.5 ns
Opposing-Direction tPSKOD 10 6 5 ns
Jitter 2 2 1 ns
1 Codirectional channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on the same side of the isolation
barrier. Opposing-direction channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on opposing sides
of the isolation barrier.
Table 5.
Parameter Symbol
1 Mbps–A, B, C Grade 25 Mbps–B, C Grade 100 Mbps–C Grade
Unit Test Conditions Min Typ Max Min Typ Max Min Typ Max
SUPPLY CURRENT No load
ADuM1280/ADuM1285 IDD1 0.75 1.4 5.1 9.0 17 23 mA
I
DD2
2.0
3.5
2.7
4.6
4.8
9
mA
ADuM1281/ADuM1286 IDD1 1.6 2.1 3.8 5.0 11 15 mA
IDD2 1.7 2.3 3.9 6.2 11 15 mA
Rev. C | Page 4 of 22
Data Sheet ADuM1280/ADuM1281/ADuM1285/ADuM1286
Rev. C | Page 5 of 22
Table 6. For All Models
Parameter Symbol Min Typ Max Unit Test Conditions
DC SPECIFICATIONS
Logic High Input Threshold VIH 0.7 VDDx V
Logic Low Input Threshold VIL 0.3 VDDx V
Logic High Output Voltages VOH V
DDx − 0.1 3.0 V IOx = −20 μA, VIx = VIxH
V
DDx − 0.4 2.8 V IOx = −4 mA, VIx = VIxH
Logic Low Output Voltages VOL 0.0 0.1 V IOx = 20 μA, VIx = VIxL
0.2 0.4 V IOx = 4 mA, VIx = VIxL
Input Current per Channel II −10 +0.01 +10 μA 0 V ≤ VIx ≤ VDDx
Supply Current per Channel
Quiescent Input Supply Current IDDI(Q) 0.4 0.6 mA
Quiescent Output Supply Current IDDO(Q) 1.2 1.7 mA
Dynamic Input Supply Current IDDI(D) 0.08 mA/Mbps
Dynamic Output Supply Current IDDO(D) 0.015 mA/Mbps
Undervoltage Lockout
Positive VDDx Threshold VDDxUV+ 2.6 V
Negative VDDx Threshold VDDxUV− 2.4 V
VDDX Hysteresis VDDxUVH 0.2 V
AC SPECIFICATIONS
Output Rise/Fall Time tR/tF 3 ns 10% to 90%
Common-Mode Transient Immunity1 |CM| 25 35 kV/μs VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
Refresh Period tr 1.6 μs
1 |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.
ELECTRICAL CHARACTERISTICS—MIXED 5 V/3 V OPERATION (A, B, AND C GRADES)
All typical specifications are at TA = 25°C, VDD1 = 5 V, VDD2 = 3.0 V. Minimum/maximum specifications apply over the entire recommended
operation range: 4.5 V ≤ VDD1 ≤ 5.5 V, 3.0 V ≤ VDD2 ≤ 3.6 V; and −40°C ≤ TA ≤ 125°C, unless otherwise noted. Switching specifications are tested
with CL = 15 pF and CMOS signal levels unless otherwise noted.
Table 7.
A Grade B Grade C Grade
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Unit Test Conditions
SWITCHING SPECIFICATIONS
Pulse Width PW 1000 40 10 ns Within PWD limit
Data Rate 1 25 100 Mbps Within PWD limit
Propagation Delay tPHL, tPLH 50 35 13 20 26 ns 50% input to 50%
output
Pulse Width Distortion PWD 10 3 2 ns |tPLH − tPHL|
Change vs. Temperature 7 3 1.5 ps/°C
Propagation Delay Skew tPSK 38 16 12 ns Between any
two units at same
operating conditions
Channel Matching1
Codirectional tPSKCD 5 3 2 ns
Opposing-Direction tPSKOD 10 6 5 ns
Jitter 2 2 1 ns
1 Codirectional channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on the same side of the isolation
barrier. Opposing-direction channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on opposing sides
of the isolation barrier.
ADuM1280/ADuM1281/ADuM1285/ADuM1286 Data Sheet
Table 8.
Parameter Symbol
1 Mbps–A, B, C Grade 25 Mbps–B, C Grade 100 Mbps–C Grade
Unit Test Conditions Min Typ Max Min Typ Max Min Typ Max
SUPPLY CURRENT No load
ADuM1280/ADuM1285 IDD1 1.1 1.6 6.2 7.0 20 25 mA
I
DD2
2.0
3.5
2.7
4.6
4.8
9.0
mA
ADuM1281/ADuM1286 IDD1 2.1 2.6 4.9 6.0 15 19 mA
IDD2 1.7 2.3 3.9 6.2 11 15 mA
Table 9. For All Models
Parameter Symbol Min Typ Max Unit Test Conditions
DC SPECIFICATIONS
Logic High Input Threshold VIH 0.7 VDDx V
Logic Low Input Threshold VIL 0.3 VDDx V
Logic High Output Voltages VOH VDDx − 0.1 VDDx V IOx = −20 µA, VIx = VIxH
VDDx − 0.4 VDDx − 0.2 V IOx = −4 mA, VIx = VIxH
Logic Low Output Voltages
V
OL
0.0
0.1
V
I
Ox
= 20 µA, V
Ix
= V
IxL
0.2 0.4 V IOx = 4 mA, VIx = VIxL
Input Current per Channel II −10 +0.01 +10 µA 0 V ≤ VIx ≤ VDDx
Supply Current per Channel
Quiescent Input Supply Current IDDI(Q) 0.54 0.75 mA
Quiescent Output Supply Current IDDO(Q) 1.2 2.0 mA
Dynamic Input Supply Current
I
DDI(D)
0.09
mA/Mbps
Dynamic Output Supply Current IDDO(D) 0.02 mA/Mbps
Undervoltage Lockout
Positive VDDX Threshold VDDxUV+ 2.6 V
Negative VDDX Threshold VDDxUV− 2.4 V
VDDX Hysteresis VDDxUVH 0.2 V
AC SPECIFICATIONS
Output Rise/Fall Time tR/tF 2.5 ns 10% to 90%
Common-Mode Transient Immunity1
|CM|
25
35
kV/µs
V
Ix
= V
DDx
, V
CM
= 1000 V,
transient magnitude = 800 V
Refresh Period tr 1.6 µs
1 |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. C | Page 6 of 22
Data Sheet ADuM1280/ADuM1281/ADuM1285/ADuM1286
Rev. C | Page 7 of 22
ELECTRICAL CHARACTERISTICS—MIXED 3 V/5 V OPERATION (A, B, AND C GRADES)
All typical specifications are at TA = 25°C, VDD1 = 3.0 V, VDD2 = 5 V. Minimum/maximum specifications apply over the entire recommended
operation range: 3.0 V ≤ VDD1 ≤ 3.6 V, 4.5 V ≤ VDD2 ≤ 5.5 V; and −40°C ≤ TA ≤ 125°C; unless otherwise noted. Switching specifications are tested
with CL = 15 pF and CMOS signal levels, unless otherwise noted.
Table 10.
A Grade B Grade C Grade
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Unit Test Conditions
SWITCHING SPECIFICATIONS
Pulse Width PW 1000 40 10 ns Within PWD limit
Data Rate 1 25 100 Mbps Within PWD limit
Propagation Delay tPHL, tPLH 50 35 16 24 30 ns
50% input to 50%
output
Pulse Width Distortion PWD 10 3 2.5 ns |tPLH − tPHL|
Change vs. Temperature 7 3 1.5 ps/°C
Propagation Delay Skew tPSK 38 16 12 ns
Between any
two units at same
operating conditions
Channel Matching1
Codirectional tPSKCD 5 3 2.5 ns
Opposing-Direction tPSKOD 10 6 5 ns
Jitter 2 2 1 ns
1 Codirectional channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on the same side of the isolation
barrier. Opposing-direction channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on opposing sides
of the isolation barrier.
Table 11.
Parameter Symbol
1 Mbps–A, B, C Grade 25 Mbps–B, C Grade 100 Mbps–C Grade
Unit Test Conditions Min Typ Max Min Typ Max Min Typ Max
SUPPLY CURRENT No load
ADuM1280/ADuM1285 I
DD1 0.75 1.4 5.1 9.0 17 23 mA
I
DD2 2.7 4.5 4.8 7.0 9.5 15 mA
ADuM1281/ADuM1286 I
DD1 1.6 2.1 3.8 5.0 11 15 mA
I
DD2 1.7 2.3 3.9 6.2 11 15 mA
Table 12. For All Models
Parameter Symbol Min Typ Max Unit Test Conditions
DC SPECIFICATIONS
Logic High Input Threshold VIH 0.7 VDDx V
Logic Low Input Threshold VIL 0.3 VDDx V
Logic High Output Voltages VOH V
DDx − 0.1 VDDx V IOx = −20 μA, VIx = VIxH
V
DDx − 0.4 VDDx − 0.2 V IOx = −4 mA, VIx = VIxH
Logic Low Output Voltages VOL 0.0 0.1 V IOx = 20 μA, VIx = VIxL
0.2 0.4 V IOx = 4 mA, VIx = VIxL
Input Current per Channel II −10 +0.01 +10 μA 0 V ≤ VIx ≤ VDDx
Supply Current per Channel
Quiescent Input Supply Current IDDI(Q) 0.4 0.75 mA
Quiescent Output Supply Current IDDO(Q) 1.6 2.0 mA
Dynamic Input Supply Current IDDI(D) 0.08 mA/Mbps
Dynamic Output Supply Current IDDO(D) 0.03 mA/Mbps
Undervoltage Lockout
Positive VDDX Threshold VDDxUV+ 2.6 V
Negative VDDX Threshold VDDxUV− 2.4 V
VDDX Hysteresis VDDxUVH 0.2 V
ADuM1280/ADuM1281/ADuM1285/ADuM1286 Data Sheet
Parameter Symbol Min Typ Max Unit Test Conditions
AC SPECIFICATIONS
Output Rise/Fall Time tR/tF 2.5 ns 10% to 90%
Common-Mode Transient Immunity1 |CM| 25 35 kV/µs VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
Refresh Period tr 1.6 µs
1 |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.
ELECTRICAL CHARACTERISTICS—3 V OPERATION (WA, WB, AND WC GRADES)
All typical specifications are at TA = 25°C, VDD1 = VDD2 = 3.0 V. Minimum/maximum specifications apply over the entire recommended operation
range: 3.0 V ≤ VDD1 ≤ 3.6 V, 3.0 V ≤ VDD2 ≤ 3 . 6 V, −40°C ≤ TA ≤ 125°C, unless otherwise noted. Switching specifications are tested with CL = 15 pF
and CMOS signal levels, unless otherwise noted.
Table 13.
WA Grade WB Grade WC Grade
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Unit Test Conditions
SWITCHING SPECIFICATIONS
Pulse Width PW 1000 40 10 ns Within PWD limit
Data Rate 1 25 100 Mbps Within PWD limit
Propagation Delay tPHL, tPLH 50 35 20 25 33 ns 50% input to 50%
output
Pulse Width Distortion PWD 10 3 2.5 ns |tPLH − tPHL|
Change vs. Temperature
7
3
1.5
ps/°C
Propagation Delay Skew tPSK 38 16 12 ns Between any
two units at same
operating conditions
Channel Matching1
Codirectional
t
PSKCD
5
3
2.5
ns
Opposing-Direction tPSKOD 10 6 5 ns
Jitter 2 2 1 ns
1 Codirectional channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on the same side of the isolation
barrier. Opposing-direction channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on opposing sides
of the isolation barrier.
Table 14.
Parameter Symbol
1 Mbps–WA, WB, WC
Grades
25 Mbps–WB, WC
Grades
100 Mbps–WC
Grade
Unit Test Conditions Min Typ Max Min Typ Max Min Typ Max
SUPPLY CURRENT
No load
ADuM1280/ADuM1285 IDD1 0.75 1.4 5.1 9.0 17 23 mA
IDD2 2.0 3.5 2.7 4.6 4.8 9 mA
ADuM1281/ADuM1286 IDD1 1.6 2.1 3.8 5.0 11 15 mA
IDD2 1.7 2.3 3.9 6.2 11 15 mA
Rev. C | Page 8 of 22
Data Sheet ADuM1280/ADuM1281/ADuM1285/ADuM1286
Rev. C | Page 9 of 22
Table 15. For All Models
Parameter Symbol Min Typ Max Unit Test Conditions
DC SPECIFICATIONS
Logic High Input Threshold VIH 0.7 VDDx V
Logic Low Input Threshold VIL 0.3 VDDx V
Logic High Output Voltages VOH V
DDx − 0.1 3.0 V IOx = −20 μA, VIx = VIxH
V
DDx − 0.4 2.8 V IOx = −4 mA, VIx = VIxH
Logic Low Output Voltages VOL 0.0 0.1 V IOx = 20 μA, VIx = VIxL
0.2 0.4 V IOx = 4 mA, VIx = VIxL
Input Current per Channel II −10 +0.01 +10 μA 0 V ≤ VIx ≤ VDDx
Supply Current per Channel
Quiescent Input Supply Current IDDI(Q) 0.4 0.6 mA
Quiescent Output Supply Current IDDO(Q) 1.2 1.7 mA
Dynamic Input Supply Current IDDI(D) 0.08 mA/Mbps
Dynamic Output Supply Current IDDO(D) 0.015 mA/Mbps
Undervoltage Lockout
Positive VDDx Threshold VDDxUV+ 2.6 V
Negative VDDx Threshold VDDxUV− 2.4 V
VDDX Hysteresis VDDxUVH 0.2 V
AC SPECIFICATIONS
Output Rise/Fall Time tR/tF 3 ns 10% to 90%
Common-Mode Transient Immunity1 |CM| 25 35 kV/μs VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
Refresh Period tr 1.6 μs
1 |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.
ELECTRICAL CHARACTERISTICS—MIXED 5 V/3 V OPERATION (WA, WB, AND WC GRADES)
All typical specifications are at TA = 25°C, VDD1 = 5 V, VDD2 = 3.0 V. Minimum/maximum specifications apply over the entire recommended
operation range: 4.5 V ≤ VDD1 ≤ 5.5 V, 3.0 V ≤ VDD2 ≤ 3.6 V; and −40°C ≤ TA ≤ 125°C, unless otherwise noted. Switching specifications are tested
with CL = 15 pF and CMOS signal levels unless otherwise noted.
Table 16.
WA Grade WB Grade WC Grade
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Unit Test Conditions
SWITCHING SPECIFICATIONS
Pulse Width PW 1000 40 10 ns Within PWD limit
Data Rate 1 25 100 Mbps Within PWD limit
Propagation Delay tPHL, tPLH 50 35 13 20 26 ns 50% input to 50%
output
Pulse Width Distortion PWD 10 3 2 ns |tPLH − tPHL|
Change vs. Temperature 7 3 1.5 ps/°C
Propagation Delay Skew tPSK 38 16 12 ns
Between any
two units at same
operating conditions
Channel Matching1
Codirectional tPSKCD 5 3 2 ns
Opposing-Direction tPSKOD 10 6 5 ns
Jitter 2 2 1 ns
1 Codirectional channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on the same side of the isolation
barrier. Opposing-direction channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on opposing sides
of the isolation barrier.
ADuM1280/ADuM1281/ADuM1285/ADuM1286 Data Sheet
Table 17.
Parameter Symbol
1 Mbps–WA, WB,
WC Grades
25 Mbps–WB,
WC Grades 100 Mbps–WC Grade
Unit Test Conditions Min Typ Max Min Typ Max Min Typ Max
SUPPLY CURRENT
No load
ADuM1280/ADuM1285 IDD1 1.1 1.6 6.2 7.0 20 25 mA
IDD2 2.0 3.5 2.7 4.6 4.8 9.0 mA
ADuM1281/ADuM1286 IDD1 2.1 2.6 4.9 6.0 15 19 mA
IDD2 1.7 2.3 3.9 6.2 11 15 mA
Table 18. For All Models
Parameter Symbol Min Typ Max Unit Test Conditions
DC SPECIFICATIONS
Logic High Input Threshold VIH 0.7 VDDx V
Logic Low Input Threshold VIL 0.3 VDDx V
Logic High Output Voltages VOH VDDx − 0.1 VDDx V IOx = −20 µA, VIx = VIxH
VDDx − 0.4 VDDx − 0.2 V IOx = −4 mA, VIx = VIxH
Logic Low Output Voltages VOL 0.0 0.1 V IOx = 20 µA, VIx = VIxL
0.2 0.4 V IOx = 4 mA, VIx = VIxL
Input Current per Channel II −10 +0.01 +10 µA 0 V ≤ VIx ≤ VDDx
Supply Current per Channel
Quiescent Input Supply Current
I
DDI(Q)
0.54
0.75
mA
Quiescent Output Supply Current IDDO(Q) 1.2 2.0 mA
Dynamic Input Supply Current IDDI(D) 0.09 mA/Mbps
Dynamic Output Supply Current IDDO(D) 0.02 mA/Mbps
Undervoltage Lockout
Positive VDDX Threshold VDDxUV+ 2.6 V
Negative V
DDX
Threshold
V
DDxUV−
2.4
V
VDDX Hysteresis VDDxUVH 0.2 V
AC SPECIFICATIONS
Output Rise/Fall Time tR/tF 2.5 ns 10% to 90%
Common-Mode Transient Immunity1 |CM| 25 35 kV/µs VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
Refresh Period tr 1.6 µs
1|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. C | Page 10 of 22
Data Sheet ADuM1280/ADuM1281/ADuM1285/ADuM1286
Rev. C | Page 11 of 22
ELECTRICAL CHARACTERISTICS—MIXED 3 V/5 V OPERATION (WA, WB, AND WC GRADES)
All typical specifications are at TA = 25°C, VDD1 = 3.0 V, VDD2 = 5 V. Minimum/maximum specifications apply over the entire recommended
operation range: 3.0 V ≤ VDD1 ≤ 3.6 V, 4.5 V ≤ VDD2 ≤ 5.5 V; and −40°C ≤ TA ≤ 125°C; unless otherwise noted. Switching specifications are tested
with CL = 15 pF and CMOS signal levels, unless otherwise noted.
Table 19.
WA Grade WB Grade WC Grade
Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Unit Test Conditions
SWITCHING SPECIFICATIONS
Pulse Width PW 1000 40 10 ns Within PWD limit
Data Rate 1 25 100 Mbps Within PWD limit
Propagation Delay tPHL, tPLH 50 35 16 24 30 ns 50% input to 50%
output
Pulse Width Distortion PWD 10 3 2.5 ns |tPLH − tPHL|
Change vs. Temperature 7 3 1.5 ps/°C
Propagation Delay Skew tPSK 38 16 12 ns
Between any
two units at same
operating conditions
Channel Matching1
Codirectional tPSKCD 5 3 2.5 ns
Opposing-Direction tPSKOD 10 6 5 ns
Jitter 2 2 1 ns
1 Codirectional channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on the same side of the isolation
barrier. Opposing-direction channel matching is the absolute value of the difference in propagation delays between any two channels with inputs on opposing sides
of the isolation barrier.
Table 20.
Parameter Symbol
1 Mbps–WA, WB,
WC Grades
25 Mbps–WB,
WC Grades 100 Mbps–WC Grade
Unit Test Conditions
Min Typ Max Min Typ Max Min Typ Max
SUPPLY CURRENT No load
ADuM1280/ADuM1285 I
DD1 0.75 1.4 5.1 9.0 17 23 mA
I
DD2 2.7 4.5 4.8 7.0 9.5 15 mA
ADuM1281/ADuM1286 I
DD1 1.6 2.1 3.8 5.0 11 15 mA
I
DD2 1.7 2.3 3.9 6.2 11 15 mA
Table 21. For All Models
Parameter Symbol Min Typ Max Unit Test Conditions
DC SPECIFICATIONS
Logic High Input Threshold VIH 0.7 VDDx V
Logic Low Input Threshold VIL 0.3 VDDx V
Logic High Output Voltages VOH V
DDx − 0.1 VDDx V IOx = −20 μA, VIx = VIxH
V
DDx − 0.4 VDDx − 0.2 V IOx = −4 mA, VIx = VIxH
Logic Low Output Voltages VOL 0.0 0.1 V IOx = 20 μA, VIx = VIxL
0.2 0.4 V IOx = 4 mA, VIx = VIxL
Input Current per Channel II −10 +0.01 +10 μA 0 V ≤ VIx ≤ VDDx
Supply Current per Channel
Quiescent Input Supply Current IDDI(Q) 0.4 0.75 mA
Quiescent Output Supply Current IDDO(Q) 1.6 2.0 mA
Dynamic Input Supply Current IDDI(D) 0.08 mA/Mbps
Dynamic Output Supply Current IDDO(D) 0.03 mA/Mbps
Undervoltage Lockout
Positive VDDX Threshold VDDxUV+ 2.6 V
Negative VDDX Threshold VDDxUV− 2.4 V
VDDX Hysteresis VDDxUVH 0.2 V
ADuM1280/ADuM1281/ADuM1285/ADuM1286 Data Sheet
Rev. C | Page 12 of 22
Parameter Symbol Min Typ Max Unit Test Conditions
AC SPECIFICATIONS
Output Rise/Fall Time tR/tF 2.5 ns 10% to 90%
Common-Mode Transient Immunity1 |CM| 25 35 kV/μs VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
Refresh Period tr 1.6 μs
1|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.
PACKAGE CHARACTERISTICS
Table 22.
Parameter Symbol Min Typ Max Unit Test Conditions/Comments
Resistance (Input-to-Output)1 R
I-O 1013 Ω
Capacitance (Input-to-Output)1 CI-O 2 pF f = 1 MHz
Input Capacitance2 C
I 4.0 pF
IC Junction-to-Ambient Thermal
Resistance
θJA 85 °C/W Thermocouple located at center of package underside
1 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.
2 Input capacitance is from any input data pin to ground.
REGULATORY INFORMATION
The ADuM1280/ADuM1281/ADuM1285/ADuM1286 are approved by the organizations listed in Table 23. See Table 27 and Table 28 for
recommended maximum working voltages for specific cross-isolation waveforms and insulation levels.
Table 23.
UL CSA VDE
Recognized Under UL 1577
Component Recognition Program1
Approved under CSA Component Acceptance
Notice 5A
Certified according to DIN V VDE V 0884-10
(VDE V 0884-10): 2006-122
Single Protection, 3000 V rms
Isolation Voltage
Basic insulation per CSA 60950-1-03 and
IEC 60950-1, 390 V rms (550 V peak) maximum
working voltage
Reinforced insulation, 560 V peak
File E214100 File 205078 File 2471900-4880-0001
1 In accordance with UL 1577, each ADuM1280/ADuM1281/ADuM1285/ADuM1286 is proof tested by applying an insulation test voltage ≥ 3600 V rms for 1 second
(current leakage detection limit = 6 μA).
2 In accordance with DIN V VDE V 0884-10, each ADuM1280/ADuM1281/ADuM1285/ADuM1286 is proof tested by applying an insulation test voltage ≥ 1050 V peak for
1 second (partial discharge detection limit = 5 pC). The asterisk (*) marked on the component designates DIN V VDE V 0884-10 approval.
INSULATION AND SAFETY-RELATED SPECIFICATIONS
Table 24.
Parameter Symbol Value Unit Test Conditions/Comments
Rated Dielectric Insulation Voltage 3000 V rms 1-minute duration
Clearance in the Plane of the PCB CLPCB 4.5 mm min
Measured from input terminals to output terminals,
shortest line of sight distance through air in the
plane of the PCB
Minimum External Air Gap (Clearance) L(I01) 4.0 mm min Measured from input terminals to output terminals,
shortest distance through air
Minimum External Tracking (Creepage) L(I02) 4.0 mm min Measured from input terminals to output terminals,
shortest distance path along body
Minimum Internal Gap (Internal Clearance) 0.017 mm min Insulation distance through insulation
Tracking Resistance (Comparative Tracking Index) CTI >400 V DIN IEC 112/VDE 0303 Part 1
Isolation Group II Material Group (DIN VDE 0110, 1/89, Table 1)
Data Sheet ADuM1280/ADuM1281/ADuM1285/ADuM1286
Rev. C | Page 13 of 22
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12 INSULATION CHARACTERISTICS
These isolators are suitable for reinforced electrical isolation within the safety limit data only. Maintenance of the safety data is ensured by
protective circuits. The asterisk (*) marked on packages denotes DIN V VDE V 0884-10 approval.
Table 25.
Description Test Conditions/Comments Symbol Characteristic Unit
Installation Classification per DIN VDE 0110
For Rated Mains Voltage ≤ 150 V rms I to IV
For Rated Mains Voltage ≤ 300 V rms I to III
For Rated Mains Voltage ≤ 400 V rms I to II
Climatic Classification 40/105/21
Pollution Degree per DIN VDE 0110, Table 1 2
Maximum Working Insulation Voltage VIORM 560 VPEAK
Input-to-Output Test Voltage, Method B1 VIORM × 1.875 = Vpd(m), 100% production test,
tini = tm = 1 sec, partial discharge < 5 pC
Vpd(m) 1050 VPEAK
Input-to-Output Test Voltage, Method A
After Environmental Tests Subgroup 1 VIORM × 1.5 = Vpd(m), tini=60 sec, tm = 10 sec,
partial discharge < 5 pC
Vpd(m) 840 VPEAK
After Input and/or Safety Test Subgroup 2
and Subgroup 3
VIORM × 1.2 = Vpd(m), tini = 60 sec, tm = 10 sec,
partial discharge < 5 pC
Vpd(m) 672 VPEAK
Highest Allowable Overvoltage VIOTM 4000 VPEAK
Withstand Isolation Voltage 1 minute withstand rating VISO 3000 VRMS
Surge Isolation Voltage VPEAK = 10 kV, 1.2 μs rise time, 50 μs, 50% fall time VIOSM 6000 VPEAK
Safety Limiting Values Maximum value allowed in the event of a failure
(see Figure 3)
Case Temperature TS 150 °C
Side 1 IDD1 Current IS1 290 mA
Insulation Resistance at TS VIO = 500 V RS >109 Ω
300
0
50
100
150
200
250
0 50 100 150 200
SAFE T Y -LI MIT I NG CURRENT ( mA)
AMBI ENT TEMPERATURE (°C)
10444-003
Figure 3. Thermal Derating Curve at VDDx = 5 V, Dependence of
Safety-Limiting Values with Case Temperature per DIN V VDE V 0884-10
RECOMMENDED OPERATING CONDITIONS
Table 26.
Parameter Symbol Min Max Unit
Operating Temperature TA −40 +125 °C
Supply Voltages1 V
DD1, VDD2
A, B, and C Grades 3.0 5.5 V
WA, WB, and WC Grades 3.0 5.5 V
Input Signal Rise and Fall Times 1.0 ms
1 See the DC Correctness and Magnetic Field Immunity section.
ADuM1280/ADuM1281/ADuM1285/ADuM1286 Data Sheet
Rev. C | Page 14 of 22
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 27.
Parameter Rating
Storage Temperature (TST) Range −65°C to +150°C
Ambient Operating Temperature
(TA) Range
−40°C to +125°C
Supply Voltages (VDD1, VDD2) −0.5 V to +7.0 V
Input Voltages (VIA, VIB) −0.5 V to VDDI + 0.5 V
Output Voltages (VOA, VOB) −0.5 V to VDD2 + 0.5 V
Average Output Current per Pin1
Side 1 (IO1) −10 mA to +10 mA
Side 2 (IO2) −10 mA to +10 mA
Common-Mode Transients2 −100 kV/μs to +100 kV/μs
1 See Figure 3 for maximum rated current values for various temperatures.
2 Refers to common-mode transients across the insulation barrier. Common-mode
transients exceeding the absolute maximum ratings may cause
latch-up or permanent damage.
Stresses at or above those listed under Absolute Maximum Ratings
may cause permanent damage to the product. This is a stress rating
only; functional operation of the product at these or any other
conditions above those indicated in the operational section of this
specification is not implied. Operation beyond the maximum
operating conditions for extended periods may affect product
reliability.
ESD CAUTION
Table 28. Maximum Continuous Working Voltage1
Parameter Max Unit Constraint
AC Voltage, Bipolar Waveform 565 V peak 50-year minimum lifetime
AC Voltage, Unipolar Waveform
Basic Insulation 1131 V peak Maximum approved working voltage per IEC 60950-1
Reinforced Insulation 560 V peak Maximum approved working voltage per IEC 60950-1 and VDE V 0884-10
DC Voltage
Basic Insulation 1131 V peak Maximum approved working voltage per IEC 60950-1
Reinforced Insulation 560 V peak Maximum approved working voltage per IEC 60950-1 and VDE V 0884-10
1 Refers to continuous voltage magnitude imposed across the isolation barrier. See the Insulation Lifetime section for more details.
Data Sheet ADuM1280/ADuM1281/ADuM1285/ADuM1286
Rev. C | Page 15 of 22
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1 8
2 7
3 6
4 5
TOP VIEW
(Not to Scale)
ADuM1280/
ADuM1285
V
DD1
V
IA
V
IB
GND
1
V
DD2
V
OA
V
OB
GND
2
10444-004
Figure 4. ADuM1280/ADuM1285 Pin Configuration
Table 29. ADuM1280/ADuM1285 Pin Function Descriptions
Pin No. Mnemonic Description
1 VDD1 Supply Voltage for Isolator Side 1 (3.0 V to 5.5 V for A, B, and C grades, 3.0 V to 5.5 V for WA, WB, and WC grades).
2 VIA Logic Input A.
3 VIB Logic Input B.
4 GND1 Ground 1. Ground reference for Isolator Side 1.
5 GND2 Ground 2. Ground reference for Isolator Side 2.
6 VOB Logic Output B.
7 VOA Logic Output A.
8 VDD2 Supply Voltage for Isolator Side 2 (3.0 V to 5.5 V for A, B, and C grades, 3.0 V to 5.5 V for WA, WB, and WC grades).
1 8
2 7
3 6
4 5
TOP VIEW
(Not to Scale)
ADuM1281/
ADuM1286
V
DD1
V
OA
V
IB
GND
1
V
DD2
V
IA
V
OB
GND
2
10444-005
Figure 5. ADuM1281/ADuM1286 Pin Configuration
Table 30. ADuM1281/ADuM1286 Pin Function Descriptions
Pin No. Mnemonic Description
1 VDD1 Supply Voltage for Isolator Side 1 (3.0 V to 5.5 V for A, B, and C grades, 3.0 V to 5.5 V for WA, WB, and WC grades).
2 VOA Logic Output A.
3 VIB Logic Input B.
4 GND1 Ground 1. Ground reference for Isolator Side 1.
5 GND2 Ground 2. Ground reference for Isolator Side 2.
6 VOB Logic Output B.
7 VIA Logic Input A.
8 VDD2 Supply Voltage for Isolator Side 2 (3.0 V to 5.5 V for A, B, and C grades, 3.0 V to 5.5 V for WA, WB, and WC grades).
For specific layout guidelines, refer to the AN-1109 Application Note, Recommendations for Control of Radiated Emissions with iCoupler Devices.
ADuM1280/ADuM1281/ADuM1285/ADuM1286 Data Sheet
Table 31. ADuM1280 Truth Table (Positive Logic)
VIA Input VIB Input VDD1 State VDD2 State VOA Output VOB Output Notes
H H Powered Powered H H
L L Powered Powered L L
H L Powered Powered H L
L H Powered Powered L H
L L Unpowered Powered H H Outputs return to the input state within
1.6 µs of VDDI power restoration.
X X Powered Unpowered Indeterminate Indeterminate Outputs return to the input state within
1.6 µs of VDDO power restoration.
Table 32. ADuM1281 Truth Table (Positive Logic)
VIA Input VIB Input VDD1 State VDD2 State VOA Output VOB Output Notes
H H Powered Powered H H
L
L
Powered
Powered
L
L
H L Powered Powered H L
L H Powered Powered L H
X L Unpowered Powered Indeterminate H Outputs return to the input state within
1.6 µs of VDD1 power restoration.
L
X
Powered
Unpowered
H
Indeterminate
Outputs return to the input state within
1.6 µs of VDDO power restoration.
Table 33. ADuM1285 Truth Table (Positive Logic)
VIA Input VIB Input VDD1 State VDD2 State VOA Output VOB Output Notes
H H Powered Powered H H
L L Powered Powered L L
H L Powered Powered H L
L H Powered Powered L H
L L Unpowered Powered L L Outputs return to the input state within
1.6 µs of VDDI power restoration.
X X Powered Unpowered Indeterminate Indeterminate Outputs return to the input state within
1.6 µs of VDDO power restoration.
Table 34. ADuM1286 Truth Table (Positive Logic)
VIA Input VIB Input VDD1 State VDD2 State VOA Output VOB Output Notes
H H Powered Powered H H
L L Powered Powered L L
H L Powered Powered H L
L H Powered Powered L H
X L Unpowered Powered Indeterminate L Outputs return to the input state within
1.6 µs of VDD1 power restoration.
L X Powered Unpowered L Indeterminate Outputs return to the input state within
1.6 µs of VDDO power restoration.
Rev. C | Page 16 of 22
Data Sheet ADuM1280/ADuM1281/ADuM1285/ADuM1286
TYPICAL PERFORMANCE CHARACTERISTICS
10
0
2
4
6
8
020 40 60 80 10010 30 50 70 90
CURRENT (mA)
DATA RATE (M bp s)
5V 3V
10444-006
Figure 6. Typical Supply Current per Input Channel vs. Data Rate
for 5 V and 3 V Operation
10
0
2
4
6
8
020 40 60 80 10010 30 50 70 90
CURRENT (mA)
DATA RATE (M bp s)
5V
3V
10444-007
Figure 7. Typical Supply Current per Output Channel vs. Data Rate
for 5 V and 3 V Operation (No Output Load)
10444-008
10
0
4
2
6
8
020 40 60 80 10010 30 50 70 90
CURRENT (mA)
DATA RATE (M bp s)
5V
3V
Figure 8. Typical Supply Current per Output Channel vs. Data Rate
for 5 V and 3 V Operation (15 pF Output Load)
10444-009
20
0
5
10
15
020 40 60 80 100
10 30 50 70 90
CURRENT (mA)
DATA RATE (M bp s)
5V
3V
Figure 9. Typical ADuM1280 or ADuM1285 VDD1 Supply Current vs.
Data Rate for 5 V and 3 V Operation
10444-010
20
0
5
10
15
020 40 60 80 100
10 30 50 70 90
CURRENT (mA)
DATA RATE (M bp s)
5V
3V
Figure 10. Typical ADuM1280 or ADuM1285 VDD2 Supply Current vs.
Data Rate for 5 V and 3 V Operation
10444-011
20
0
5
10
15
020 40 60 80 100
10 30 50 70 90
CURRENT (mA)
DATA RATE (M bp s)
5V
3V
Figure 11. Typical ADuM1281 or ADuM1286 VDD1 or VDD2 Supply Current vs.
Data Rate for 5 V and 3 V Operation
Rev. C | Page 17 of 22
ADuM1280/ADuM1281/ADuM1285/ADuM1286 Data Sheet
APPLICATIONS INFORMATION
PC BOARD LAYOUT
The ADuM1280/ADuM1281/ADuM1285/ADuM1286 digital
isolator requires no external interface circuitry for the logic
interfaces. Power supply bypassing is strongly recommended at
both input and output supply pins VDD1 and VDD2 (see Figure 12).
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.
The ADuM1280/ADuM1281/ADuM1285/ADuM1286 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, with
proper PCB design choices. Refer to the AN-1109 Applicaton
Note, Recommendations for Control of Radiated Emissions with
iCoupler Devices 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-to-
output propagation delay time for a high-to-low transition may
differ from the propagation delay time of a low-to-high transition.
INPUT (V
Ix
)
OUTPUT (V
Ox
)
t
PLH
t
PHL
50%
50%
10444-012
Figure 12. Propagation Delay Parameters
Pulse width distortion is the maximum difference between these
two propagation delay values and an indication of how accurately
the timing of the input signal is preserved.
Channel-to-channel matching refers to the maximum amount the
propagation delay differs between channels within a single
ADuM1280/ADuM1281/ADuM1285/ADuM1286 component.
Propagation delay skew refers to the maximum amount the
propagation delay differs between multiple ADuM1280/
ADuM1281/ADuM1285/ADuM1286 components operating
under the same conditions.
DC CORRECTNESS AND MAGNETIC FIELD
IMMUNITY
Positive and negative logic transitions at the isolator input cause
narrow (~1 ns) pulses to be sent via the transformer to the decoder.
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 ~1.6 µs, a periodic
set of refresh pulses indicative of the correct input state are sent to
ensure dc correctness at the output.
If the decoder receives no pulses for more than about 6.4 µs, the
input side is assumed to be unpowered or nonfunctional, in which
case, the isolator output is forced to a default low state by the
watchdog timer circuit.
The limitation on the device’s magnetic field immunity is set by
the condition in which induced voltage in the transformer
receiving coil is sufficiently large to either falsely set or reset the
decoder. The following analysis defines such conditions. The
ADuM1280 is examined in a 3 V operating condition because it
represents the most susceptible mode of operation of this
product.
The pulses at the transformer output have an amplitude greater
than 1.5 V. The decoder has a sensing threshold of about 1.0 V,
therefore 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)∑πrn2; n = 1, 2, …, N
where:
β is the magnetic flux density.
rn is the radius of the nth turn in the receiving coil.
N is the number of turns in the receiving coil.
Given the geometry of the receiving coil in the ADuM1280 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 is calculated, as shown in Figure 13.
MAG NETI C FI E LD F RE QUENCY ( Hz )
100
MAXIMUM ALLOWABLE MAGNETIC FLUX
DENSI TY ( kgau ss)
0.001 1M
10
0.01
1k 10k 10M
0.1
1
100M100k
10444-013
Figure 13. Maximum Allowable External Magnetic Flux Density
Rev. C | Page 18 of 22
Data Sheet ADuM1280/ADuM1281/ADuM1285/ADuM1286
For example, at a magnetic field frequency of 1 MHz, the
maximum allowable magnetic field of 0.08 kgauss induces a voltage
of 0.25 V at the receiving coil. This is about 50% of the sensing
threshold and does not cause a faulty output transition. If such an
event occurs, with the worst-case polarity, during a transmitted
pulse, it would reduce the received pulse from >1.0 V to 0.75 V.
This is 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 away from the ADuM1280
transformers. Figure 14 expresses these allowable current
magnitudes as a function of frequency for selected distances. The
ADuM1280 is very insensitive to external fields. Only extremely
large, high frequency currents, very close to the component could
potentially be a concern. For the 1 MHz example noted, place a 0.2
kA current 5 mm away from the ADuM1280 to affect component
operation.
MAG NETI C FI E LD F RE QUENCY ( Hz )
MAXI MUM AL LO WABL E CURRE NT (kA)
1000
100
10
1
0.1
0.011k 10k 100M100k 1M 10M
DISTANCE = 5mm
DISTANCE = 1m
DISTANCE = 100mm
10444-014
Figure 14. Maximum Allowable Current for
Various Current to ADuM1280 Spacings
Note that at combinations of strong magnetic field and high
frequency, any loops formed by printed circuit board traces
could induce sufficiently large error voltages to trigger the
thresholds of succeeding circuitry. Take care to avoid PCB
structures that form loops.
POWER CONSUMPTION
The supply current at a given channel of the ADuM1280/
ADuM1281/ADuM1285/ADuM1286 isolator is a function of the
supply voltage, the data rate of the channel, and the output load of
the channel.
For each input channel, the supply current is given by
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 × 10−3) × CL × VDDO) × (2f − fr) + IDDO (Q)
f > 0.5 fr
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) = 1/tr (µs).
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 11 show the total VDD1 and
VDD2 supply current as a function of data rate for ADuM1280/
ADuM1281 channel configurations.
Rev. C | Page 19 of 22
ADuM1280/ADuM1281/ADuM1285/ADuM1286 Data Sheet
INSULATION LIFETIME
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 ADuM1280/ADuM1281/
ADuM1285/ADuM1286.
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 28 summarize the peak voltage
for 50 years of service life for a bipolar ac operating condition and
the maximum CSA/VDE approved working voltages. In many
cases, the approved working voltage is higher than the 50-year
service life voltage. Operation at these high working voltages can
lead to shortened insulation life in some cases.
The insulation lifetime of the ADuM1280/ADuM1281/
ADuM1285/ADuM1286 depends on the voltage waveform type
imposed across the isolation barrier. The iCoupler insulation
structure degrades at different rates depending on whether the
waveform is bipolar ac, unipolar ac, or dc. Figure 15, Figure 16, and
Figure 17 illustrate these different isolation voltage waveforms.
Bipolar ac voltage is the most stringent environment. The goal
of a 50-year operating lifetime under the ac bipolar condition
determines the Analog Devices recommended maximum working
voltage.
In the case of unipolar ac or dc voltage, the stress on the insulation
is significantly lower. This allows operation at higher working
voltages while still achieving a 50-year service life. The working
voltages listed in Table 28 can be applied while maintaining the
50-year minimum lifetime provided the voltage conforms to either
the unipolar ac or dc voltage case. Any cross-insulation voltage
waveform that does not conform to Figure 16 or Figure 17 should
be treated as a bipolar ac waveform, and its peak voltage should be
limited to the 50-year lifetime voltage value listed in Table 28.
Note that the voltage presented in Figure 17 is shown as
sinusoidal for illustration purposes only. It is meant to represent
any voltage waveform varying between 0 V and some limiting
value. The limiting value can be positive or negative, but the
voltage cannot cross 0 V.
0V
RATED P E AK V OL TAG E
10444-015
Figure 15. Bipolar AC Waveform
0V
RATED P E AK V OL TAG E
10444-016
Figure 16. Unipolar AC Waveform
0V
RATED P E AK V OL TAG E
10444-017
Figure 17. DC Waveform
Rev. C | Page 20 of 22
Data Sheet ADuM1280/ADuM1281/ADuM1285/ADuM1286
OUTLINE DIMENSIONS
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.
COMPLIANT TO JEDEC STANDARDS MS-012-AA
012407-A
0.25 (0.0098)
0.17 (0.0067)
1.27 (0.0500)
0.40 (0.0157)
0.50 (0.0196)
0.25 (0.0099) 45°
8°
0°
1.75 (0.0688)
1.35 (0.0532)
SEATING
PLANE
0.25 (0.0098)
0.10 (0.0040)
4
1
8 5
5.00(0.1968)
4.80(0.1890)
4.00 (0.1574)
3.80 (0.1497)
1.27 (0.0500)
BSC
6.20 (0.2441)
5.80 (0.2284)
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
Figure 18. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body (R-8)
Dimensions shown in millimeters (inches)
ORDERING GUIDE
Model
1, 2, 3
No. of Inputs,
VDD1 Side
No. of Inputs,
VDD2 Side
Max
Data Rate
Max Prop
Delay, 5 V
Output
Default State
Temperature
Range Package Description
Package
Option
ADuM1280ARZ
2 0 1 Mbps 50 High −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1280WARZ
2 0 1 Mbps 50 High −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1280BRZ
2 0 25 Mbps 35 High −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1280WBRZ
2 0 25 Mbps 35 High −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1280CRZ
2 0 100 Mbps 24 High −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1280WCRZ
2
0
100 Mbps
24
High
−40°C to +125°C
8-Lead SOIC_N
R-8
ADuM1281ARZ
1 1 1 Mbps 50 High −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1281WARZ
1 1 1 Mbps 50 High −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1281BRZ
1 1 25 Mbps 35 High −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1281WBRZ
1 1 25 Mbps 35 High −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1281CRZ
1
1
100 Mbps
24
High
−40°C to +125°C
8-Lead SOIC_N
R-8
ADuM1281WCRZ
1 1 100 Mbps 24 High −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1285ARZ
2 0 1 Mbps 50 Low −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1285WARZ
2 0 1 Mbps 50 Low −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1285BRZ
2 0 25 Mbps 35 Low −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1285WBRZ
2 0 25 Mbps 35 Low −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1285CRZ
2
0
100 Mbps
24
Low
−40°C to +125°C
8-Lead SOIC_N
R-8
ADuM1285WCRZ
2 0 100 Mbps 24 Low −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1286ARZ
1 1 1 Mbps 50 Low −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1286WARZ
1 1 1 Mbps 50 Low −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1286BRZ
1 1 25 Mbps 35 Low −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1286WBRZ
1 1 25 Mbps 35 Low −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1286CRZ
1 1 100 Mbps 24 Low −40°C to +125°C 8-Lead SOIC_N R-8
ADuM1286WCRZ
1 1 100 Mbps 24 Low −40°C to +125°C 8-Lead SOIC_N R-8
1 Z = RoHS Compliant Part.
2 Tape and reel are available. The addition of an “-RL7” suffix designates a 7” (1,000 units) tape and reel option.
3 W = Qualified for Automotive Applications.
AUTOMOTIVE PRODUCTS
The ADuM1280W, ADuM1281W, ADuM1285W, and ADuM1286W models are available with controlled manufacturing to support the quality
and reliability requirements of automotive applications. Note that these automotive models may have specifications that differ from the
commercial models; therefore, designers should review the Specifications section of this data sheet carefully. Only the automotive grade products
shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering
information and to obtain the specific Automotive Reliability reports for these models.
Rev. C | Page 21 of 22
ADuM1280/ADuM1281/ADuM1285/ADuM1286 Data Sheet
NOTES
©2012–2015 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D10444-0-7/15(C)
Rev. C | Page 22 of 22
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Analog Devices Inc.:
ADUM1286ARZ ADUM1281BRZ ADUM1281CRZ-RL7 ADUM1280ARZ ADUM1285ARZ ADUM1285ARZ-RL7
ADUM1285CRZ ADUM1285BRZ ADUM1286BRZ-RL7 ADUM1280CRZ-RL7 ADUM1281BRZ-RL7 ADUM1280ARZ-
RL7 ADUM1280BRZ ADUM1286CRZ ADUM1280CRZ ADUM1285CRZ-RL7 ADUM1286BRZ ADUM1286ARZ-RL7
ADUM1285BRZ-RL7 ADUM1286CRZ-RL7 ADUM1281CRZ ADUM1281ARZ-RL7 ADUM1280BRZ-RL7
ADUM1281ARZ ADUM1285WBRZ-RL7 ADUM1285WBRZ ADUM1285WCRZ ADUM1280WARZ-RL7
ADUM1281WARZ-RL7 ADUM1281WCRZ-RL7 ADUM1286WARZ ADUM1280WBRZ ADUM1280WCRZ
ADUM1280WCRZ-RL7 ADUM1281WBRZ ADUM1286WCRZ ADUM1281WBRZ-RL7 ADUM1286WARZ-RL7
ADUM1285WARZ-RL7 ADUM1286WCRZ-RL7 ADUM1285WARZ ADUM1281WCRZ ADUM1285WCRZ-RL7
ADUM1286WBRZ-RL7 ADUM1286WBRZ ADUM1280WARZ ADUM1280WBRZ-RL7 ADUM1281WARZ