Technical Data Sheet

FUNCTIONAL BLOCK DIAGRAMS
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
VDD1 1
ADuM1280/
ADuM1285
8
VDD2
VIA 2
ENCODE
DECODE
7
VOA
VIB 3
ENCODE
DECODE
6
VOB
5
GND2
8
VDD2
GND1 4
10444-001
FEATURES
Figure 1. ADuM1280/ADuM1285
VDD1 1
ADuM1281/
ADuM1286
VOA 2
DECODE
ENCODE
7
VIA
VIB 3
ENCODE
DECODE
6
VOB
5
GND2
GND1 4
10444-002
Data Sheet
3 kV RMS Dual Channel Digital Isolators
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Figure 2. ADuM1281/ADuM1286
APPLICATIONS
General-purpose multichannel isolation
Data converter isolation
Industrial field bus isolation
Hybrid electric vehicles, battery monitor, and motor drive
GENERAL DESCRIPTION
The ADuM1280/ADuM1281/ADuM1285/ADuM12861 are dualchannel 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
1
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.
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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Technical Support
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ADuM1280/ADuM1281/ADuM1285/ADuM1286
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Regulatory Information............................................................... 12
Applications ....................................................................................... 1
Insulation and Safety-Related Specifications.............................. 12
Functional Block Diagrams ............................................................... 1
General Description ......................................................................... 1
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
Insulation Characteristics ......................................................... 13
Revision History ............................................................................... 2
Recommended Operating Conditions .................................... 13
Specifications..................................................................................... 3
Absolute Maximum Ratings ......................................................... 14
Electrical Characteristics—5 V Operation (All Grades) ......... 3
ESD Caution................................................................................. 14
Electrical Characteristics—3 V Operation (A, B, and C
Grades) ........................................................................................... 4
Pin Configuration and Function Descriptions........................... 15
Electrical Characteristics—Mixed 5 V/3 V Operation (A, B,
and C Grades) ............................................................................... 5
Applications Information .............................................................. 18
Electrical Characteristics—Mixed 3 V/5 V Operation (A, B,
and C Grades) ............................................................................... 7
Propagation Delay-Related Parameters ................................... 18
Electrical Characteristics—3 V Operation (WA, WB, and WC
Grades) ........................................................................................... 8
Power Consumption .................................................................. 19
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
Typical Performance Characteristics ........................................... 17
PC Board Layout ........................................................................ 18
DC Correctness and Magnetic Field Immunity ..................... 18
Insulation Lifetime ..................................................................... 20
Outline Dimensions ....................................................................... 21
Ordering Guide .......................................................................... 21
Automotive Products................................................................... 21
Package Characteristics ............................................................. 12
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—Rev. A to Rev. B
Change to Features ........................................................................... 1
Changes to Regulatory Information Section and Table 23 ....... 10
Changes to Table 24 ........................................................................ 10
3/13—Rev. 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.
Parameter
SWITCHING SPECIFICATIONS
Pulse Width
Data Rate
Propagation Delay
A, WA Grades
Min
Typ Max
B, WB Grades
Min Typ Max
C, WC Grades
Min Typ Max
PW
1000
40
10
1
50
tPHL, tPLH
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew
PWD
25
35
10
13
100
24
18
3
7
Channel Matching 1
Codirectional
Opposing-Direction
Jitter
1
Symbol
2
3
1.5
tPSK
38
12
9
tPSKCD
tPSKOD
5
10
3
6
2
5
2
2
1
Unit
Test Conditions
ns
Mbps
ns
Within PWD limit
Within PWD limit
50% input to 50%
output
|tPLH − tPHL|
ns
ps/°C
ns
Between any
two units at same
operating conditions
ns
ns
ns
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
SUPPLY CURRENT
ADuM1280/ADuM1285
ADuM1281/ADuM1286
Symbol
1 Mbps–A, B, C,WA, WB, 25 Mbps–B, C, WB,
WC Grades
WC Grades
Min
Typ
Max
Min
Typ
Max
IDD1
IDD2
IDD1
IDD2
1.1
2.7
2.1
2.3
1.6
4.5
2.6
2.9
6.2
4.8
4.9
4.7
100 Mbps–C, WC
Grades
Min
Typ
Max
Unit
20
9.5
15
15.6
mA
mA
mA
mA
7.0
7.0
6.0
6.4
25
15
19
19
Test Conditions
No load
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
II
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
Typ
Max
0.3 VDDx
VDDx − 0.1
VDDx − 0.4
−10
5.0
4.8
0.0
0.2
+0.01
0.54
1.6
0.09
0.04
Rev. C | Page 3 of 22
0.1
0.4
+10
0.8
2.0
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
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Parameter
Undervoltage Lockout
Positive VDDx Threshold
Negative VDDx Threshold
VDDx Hysteresis
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity1
Symbol
Typ
VDDXUV+
VDDXUVVDDXUVH
tR/tF
|CM|
Refresh Period
1
Min
Data Sheet
25
tr
Max
Unit
2.6
2.4
0.2
V
V
V
2.5
35
ns
kV/µs
1.6
µs
Test Conditions
10% to 90%
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
|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.
Parameter
SWITCHING SPECIFICATIONS
Pulse Width
Data Rate
Propagation Delay
1
Min
PW
1000
A Grade
Typ
Max
Min
B Grade
Typ
Max
40
PWD
Min
C Grade
Typ
Max
10
1
50
tPHL, tPLH
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew
Channel Matching 1
Codirectional
Opposing-Direction
Jitter
Symbol
25
35
10
20
25
3
7
100
33
2.5
3
1.5
tPSK
38
16
12
tPSKCD
tPSKOD
5
10
3
6
2.5
5
2
2
1
Unit
Test Conditions
ns
Mbps
ns
Within PWD limit
Within PWD limit
50% input to 50%
output
|tPLH − tPHL|
ns
ps/°C
ns
Between any
two units at same
operating conditions
ns
ns
ns
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
SUPPLY CURRENT
ADuM1280/ADuM1285
ADuM1281/ADuM1286
Symbol
IDD1
IDD2
IDD1
IDD2
1 Mbps–A, B, C Grade
Min
Typ
Max
0.75
2.0
1.6
1.7
1.4
3.5
2.1
2.3
25 Mbps–B, C Grade
Min
Typ
Max
5.1
2.7
3.8
3.9
Rev. C | Page 4 of 22
9.0
4.6
5.0
6.2
100 Mbps–C Grade
Min
Typ
Max
Unit
17
4.8
11
11
mA
mA
mA
mA
23
9
15
15
Test Conditions
No load
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
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
Undervoltage Lockout
Positive VDDx Threshold
Negative VDDx Threshold
VDDX Hysteresis
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity1
Refresh Period
1
II
Typ
Max
0.3 VDDx
VDDx − 0.1
VDDx − 0.4
3.0
2.8
0.0
0.2
+0.01
−10
0.1
0.4
+10
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
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
0.4
1.2
0.08
0.015
VDDxUV+
VDDxUV−
VDDxUVH
2.6
2.4
0.2
V
V
V
3
35
ns
kV/μs
1.6
μs
tR/tF
|CM|
25
tr
0.6
1.7
Unit
mA
mA
mA/Mbps
mA/Mbps
10% to 90%
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
|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.
Parameter
SWITCHING SPECIFICATIONS
Pulse Width
Data Rate
Propagation Delay
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew
Channel Matching1
Codirectional
Opposing-Direction
Jitter
1
Symbol
Min
PW
1000
A Grade
Typ Max
Min
B Grade
Typ Max
40
PWD
25
35
10
7
C Grade
Typ Max
10
1
50
tPHL, tPLH
Min
13
20
3
3
100
26
2
1.5
tPSK
38
16
12
tPSKCD
tPSKOD
5
10
3
6
2
5
2
2
1
Unit
Test Conditions
ns
Mbps
ns
Within PWD limit
Within PWD limit
50% input to 50%
output
|tPLH − tPHL|
ns
ps/°C
ns
Between any
two units at same
operating conditions
ns
ns
ns
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.
Rev. C | Page 5 of 22
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Data Sheet
Table 8.
Parameter
SUPPLY CURRENT
ADuM1280/ADuM1285
ADuM1281/ADuM1286
Symbol
1 Mbps–A, B, C Grade
Min
Typ
Max
IDD1
IDD2
IDD1
IDD2
1.1
2.0
2.1
1.7
25 Mbps–B, C Grade
Min
Typ
Max
1.6
3.5
2.6
2.3
6.2
2.7
4.9
3.9
7.0
4.6
6.0
6.2
100 Mbps–C Grade
Min
Typ
Max
Unit
20
4.8
15
11
mA
mA
mA
mA
25
9.0
19
15
Test Conditions
No load
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
Undervoltage Lockout
Positive VDDX Threshold
Negative VDDX Threshold
VDDX Hysteresis
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity1
Refresh Period
1
II
Typ
Max
0.3 VDDx
VDDx − 0.1
VDDx − 0.4
−10
VDDx
VDDx − 0.2
0.0
0.2
+0.01
0.1
0.4
+10
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
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
0.54
1.2
0.09
0.02
VDDxUV+
VDDxUV−
VDDxUVH
2.6
2.4
0.2
V
V
V
2.5
35
ns
kV/µs
1.6
µs
tR/tF
|CM|
tr
25
0.75
2.0
Unit
mA
mA
mA/Mbps
mA/Mbps
10% to 90%
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
|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
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.
Parameter
SWITCHING SPECIFICATIONS
Pulse Width
Data Rate
Propagation Delay
Min
PW
1000
A Grade
Typ Max
Min
B Grade
Typ Max
PWD
C Grade
Typ Max
10
25
35
10
16
24
3
7
Channel Matching1
Codirectional
Opposing-Direction
Jitter
Min
40
1
50
tPHL, tPLH
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew
1
Symbol
100
30
2.5
3
1.5
tPSK
38
16
12
tPSKCD
tPSKOD
5
10
3
6
2.5
5
2
2
1
Unit
Test Conditions
ns
Mbps
ns
Within PWD limit
Within PWD limit
50% input to 50%
output
|tPLH − tPHL|
ns
ps/°C
ns
Between any
two units at same
operating conditions
ns
ns
ns
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
SUPPLY CURRENT
ADuM1280/ADuM1285
ADuM1281/ADuM1286
Symbol
1 Mbps–A, B, C Grade
Min
Typ
Max
IDD1
IDD2
IDD1
IDD2
0.75
2.7
1.6
1.7
25 Mbps–B, C Grade
Min
Typ
Max
1.4
4.5
2.1
2.3
5.1
4.8
3.8
3.9
9.0
7.0
5.0
6.2
100 Mbps–C Grade
Min
Typ
Max
Unit
17
9.5
11
11
mA
mA
mA
mA
23
15
15
15
Test Conditions
No load
Table 12. 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
Undervoltage Lockout
Positive VDDX Threshold
Negative VDDX Threshold
VDDX Hysteresis
II
Typ
Max
0.3 VDDx
VDDx − 0.1
VDDx − 0.4
−10
VDDx
VDDx − 0.2
0.0
0.2
+0.01
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
0.4
1.6
0.08
0.03
VDDxUV+
VDDxUV−
VDDxUVH
2.6
2.4
0.2
Rev. C | Page 7 of 22
0.1
0.4
+10
0.75
2.0
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
V
V
V
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Parameter
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity1
Refresh Period
1
Symbol
Min
Typ
tR/tF
|CM|
25
tr
Data Sheet
Max
Unit
Test Conditions
2.5
35
ns
kV/µs
10% to 90%
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
1.6
µs
|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.
Parameter
SWITCHING SPECIFICATIONS
Pulse Width
Data Rate
Propagation Delay
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew
Channel Matching 1
Codirectional
Opposing-Direction
Jitter
1
Symbol
WA Grade
Min
Typ Max
WB Grade
Min Typ Max
WC Grade
Min Typ Max
PW
1000
40
10
1
50
tPHL, tPLH
PWD
25
35
10
20
25
3
7
100
33
2.5
3
1.5
tPSK
38
16
12
tPSKCD
tPSKOD
5
10
3
6
2.5
5
2
2
1
Unit
Test Conditions
ns
Mbps
ns
Within PWD limit
Within PWD limit
50% input to 50%
output
|tPLH − tPHL|
ns
ps/°C
ns
Between any
two units at same
operating conditions
ns
ns
ns
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
SUPPLY CURRENT
ADuM1280/ADuM1285
ADuM1281/ADuM1286
Symbol
IDD1
IDD2
IDD1
IDD2
1 Mbps–WA, WB, WC
Grades
Min Typ
Max
0.75
2.0
1.6
1.7
1.4
3.5
2.1
2.3
25 Mbps–WB, WC
Grades
Min
Typ
Max
100 Mbps–WC
Grade
Min
Typ
Max
Unit
5.1
2.7
3.8
3.9
17
4.8
11
11
mA
mA
mA
mA
Rev. C | Page 8 of 22
9.0
4.6
5.0
6.2
23
9
15
15
Test Conditions
No load
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Table 15. 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
Undervoltage Lockout
Positive VDDx Threshold
Negative VDDx Threshold
VDDX Hysteresis
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity1
Refresh Period
1
Typ
Max
0.3 VDDx
VDDx − 0.1
VDDx − 0.4
II
3.0
2.8
0.0
0.2
+0.01
−10
0.1
0.4
+10
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
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
0.4
1.2
0.08
0.015
VDDxUV+
VDDxUV−
VDDxUVH
2.6
2.4
0.2
V
V
V
3
35
ns
kV/μs
1.6
μs
tR/tF
|CM|
25
tr
0.6
1.7
Unit
mA
mA
mA/Mbps
mA/Mbps
10% to 90%
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
|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.
Parameter
SWITCHING SPECIFICATIONS
Pulse Width
Data Rate
Propagation Delay
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew
Channel Matching1
Codirectional
Opposing-Direction
Jitter
1
WA Grade
Typ Max
Symbol
Min
PW
1000
WB Grade
Min Typ Max
WC Grade
Min Typ Max
40
10
1
50
tPHL, tPLH
PWD
25
35
10
7
13
20
3
3
100
26
2
1.5
tPSK
38
16
12
tPSKCD
tPSKOD
5
10
3
6
2
5
2
2
1
Unit
Test Conditions
ns
Mbps
ns
Within PWD limit
Within PWD limit
50% input to 50%
output
|tPLH − tPHL|
ns
ps/°C
ns
Between any
two units at same
operating conditions
ns
ns
ns
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.
Rev. C | Page 9 of 22
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Data Sheet
Table 17.
Parameter
SUPPLY CURRENT
ADuM1280/ADuM1285
ADuM1281/ADuM1286
Symbol
1 Mbps–WA, WB,
WC Grades
Min Typ Max
25 Mbps–WB,
WC Grades
Min Typ Max
1.1
2.0
2.1
1.7
6.2
2.7
4.9
3.9
IDD1
IDD2
IDD1
IDD2
1.6
3.5
2.6
2.3
100 Mbps–WC Grade
Min
Typ
Max
7.0
4.6
6.0
6.2
20
4.8
15
11
25
9.0
19
15
Unit
Test Conditions
No load
mA
mA
mA
mA
Table 18. 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
Undervoltage Lockout
Positive VDDX Threshold
Negative VDDX Threshold
VDDX Hysteresis
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity1
Refresh Period
Symbol
Min
VIH
VIL
VOH
0.7 VDDx
Max
0.3 VDDx
VDDx − 0.1
VDDx − 0.4
VOL
II
Typ
−10
VDDx
VDDx − 0.2
0.0
0.2
+0.01
0.1
0.4
+10
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
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
0.54
1.2
0.09
0.02
VDDxUV+
VDDxUV−
VDDxUVH
2.6
2.4
0.2
V
V
V
tR/tF
|CM|
2.5
35
ns
kV/µs
1.6
µs
tr
25
0.75
2.0
Unit
mA
mA
mA/Mbps
mA/Mbps
10% to 90%
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
|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.
1
Rev. C | Page 10 of 22
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
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.
Parameter
SWITCHING SPECIFICATIONS
Pulse Width
Data Rate
Propagation Delay
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew
Channel Matching1
Codirectional
Opposing-Direction
Jitter
1
WA Grade
Typ Max
Symbol
Min
PW
1000
WB Grade
Min Typ Max
WC Grade
Min Typ Max
40
10
1
50
tPHL, tPLH
PWD
25
35
10
16
100
30
24
3
7
2.5
3
1.5
tPSK
38
16
12
tPSKCD
tPSKOD
5
10
3
6
2.5
5
2
2
1
Unit
Test Conditions
ns
Mbps
ns
Within PWD limit
Within PWD limit
50% input to 50%
output
|tPLH − tPHL|
ns
ps/°C
ns
Between any
two units at same
operating conditions
ns
ns
ns
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
SUPPLY CURRENT
ADuM1280/ADuM1285
ADuM1281/ADuM1286
Symbol
1 Mbps–WA, WB,
WC Grades
Min Typ
Max
25 Mbps–WB,
WC Grades
Min Typ Max
0.75
2.7
1.6
1.7
5.1
4.8
3.8
3.9
IDD1
IDD2
IDD1
IDD2
1.4
4.5
2.1
2.3
100 Mbps–WC Grade
Min
Typ
Max
9.0
7.0
5.0
6.2
17
9.5
11
11
23
15
15
15
Unit
Test Conditions
No load
mA
mA
mA
mA
Table 21. 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
Undervoltage Lockout
Positive VDDX Threshold
Negative VDDX Threshold
VDDX Hysteresis
II
Typ
Max
0.3 VDDx
VDDx − 0.1
VDDx − 0.4
−10
VDDx
VDDx − 0.2
0.0
0.2
+0.01
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
0.4
1.6
0.08
0.03
VDDxUV+
VDDxUV−
VDDxUVH
2.6
2.4
0.2
Rev. C | Page 11 of 22
0.1
0.4
+10
0.75
2.0
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
V
V
V
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Parameter
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity1
Refresh Period
Symbol
Min
Typ
tR/tF
|CM|
25
tr
Data Sheet
Max
Unit
Test Conditions
2.5
35
ns
kV/μs
10% to 90%
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
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
Resistance (Input-to-Output)1
Capacitance (Input-to-Output)1
Input Capacitance2
IC Junction-to-Ambient Thermal
Resistance
1
2
Symbol
RI-O
CI-O
CI
θJA
Min
Typ
1013
2
4.0
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 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
Recognized Under UL 1577
Component Recognition Program1
Single Protection, 3000 V rms
Isolation Voltage
File E214100
CSA
Approved under CSA Component Acceptance
Notice 5A
Basic insulation per CSA 60950-1-03 and
IEC 60950-1, 390 V rms (550 V peak) maximum
working voltage
File 205078
VDE
Certified according to DIN V VDE V 0884-10
(VDE V 0884-10): 2006-122
Reinforced insulation, 560 V peak
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
Rated Dielectric Insulation Voltage
Clearance in the Plane of the PCB
Symbol
CLPCB
Value
3000
4.5
Unit
V rms
mm min
Minimum External Air Gap (Clearance)
L(I01)
4.0
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
0.017
>400
II
mm min
V
Rev. C | Page 12 of 22
Test Conditions/Comments
1-minute duration
Measured from input terminals to output terminals,
shortest line of sight distance through air in the
plane of the PCB
Measured from input terminals to output terminals,
shortest distance through air
Measured from input terminals to output terminals,
shortest distance path along body
Insulation distance through insulation
DIN IEC 112/VDE 0303 Part 1
Material Group (DIN VDE 0110, 1/89, Table 1)
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
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
Installation Classification per DIN VDE 0110
For Rated Mains Voltage ≤ 150 V rms
For Rated Mains Voltage ≤ 300 V rms
For Rated Mains Voltage ≤ 400 V rms
Climatic Classification
Pollution Degree per DIN VDE 0110, Table 1
Maximum Working Insulation Voltage
Input-to-Output Test Voltage, Method B1
Test Conditions/Comments
VIORM × 1.875 = Vpd(m), 100% production test,
tini = tm = 1 sec, partial discharge < 5 pC
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
VIORM × 1.2 = Vpd(m), tini = 60 sec, tm = 10 sec,
partial discharge < 5 pC
After Input and/or Safety Test Subgroup 2
and Subgroup 3
Highest Allowable Overvoltage
Withstand Isolation Voltage
Surge Isolation Voltage
Safety Limiting Values
1 minute withstand rating
VPEAK = 10 kV, 1.2 μs rise time, 50 μs, 50% fall time
Maximum value allowed in the event of a failure
(see Figure 3)
Case Temperature
Side 1 IDD1 Current
Insulation Resistance at TS
VIO = 500 V
Symbol
Characteristic
Unit
VIORM
Vpd(m)
I to IV
I to III
I to II
40/105/21
2
560
1050
VPEAK
VPEAK
Vpd(m)
840
VPEAK
Vpd(m)
672
VPEAK
VIOTM
VISO
VIOSM
4000
3000
6000
VPEAK
VRMS
VPEAK
TS
IS1
RS
150
290
>109
°C
mA
Ω
RECOMMENDED OPERATING CONDITIONS
Table 26.
Parameter
Operating Temperature
Supply Voltages1
A, B, and C Grades
WA, WB, and WC Grades
Input Signal Rise and Fall Times
250
200
150
100
1
50
0
0
50
100
150
AMBIENT TEMPERATURE (°C)
200
Symbol
TA
VDD1, VDD2
Min
−40
Max
+125
Unit
°C
3.0
3.0
5.5
5.5
1.0
V
V
ms
See the DC Correctness and Magnetic Field Immunity section.
10444-003
SAFETY-LIMITING CURRENT (mA)
300
Figure 3. Thermal Derating Curve at VDDx = 5 V, Dependence of
Safety-Limiting Values with Case Temperature per DIN V VDE V 0884-10
Rev. C | Page 13 of 22
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Data Sheet
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
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.
Table 27.
Parameter
Storage Temperature (TST) Range
Ambient Operating Temperature
(TA) Range
Supply Voltages (VDD1, VDD2)
Input Voltages (VIA, VIB)
Output Voltages (VOA, VOB)
Average Output Current per Pin1
Side 1 (IO1)
Side 2 (IO2)
Common-Mode Transients2
1
2
Rating
−65°C to +150°C
−40°C to +125°C
−0.5 V to +7.0 V
−0.5 V to VDDI + 0.5 V
−0.5 V to VDD2 + 0.5 V
ESD CAUTION
−10 mA to +10 mA
−10 mA to +10 mA
−100 kV/μs to +100 kV/μs
See Figure 3 for maximum rated current values for various temperatures.
Refers to common-mode transients across the insulation barrier. Common-mode
transients exceeding the absolute maximum ratings may cause
latch-up or permanent damage.
Table 28. Maximum Continuous Working Voltage1
Parameter
AC Voltage, Bipolar Waveform
AC Voltage, Unipolar Waveform
Basic Insulation
Reinforced Insulation
DC Voltage
Basic Insulation
Reinforced Insulation
1
Max
565
Unit
V peak
Constraint
50-year minimum lifetime
1131
560
V peak
V peak
Maximum approved working voltage per IEC 60950-1
Maximum approved working voltage per IEC 60950-1 and VDE V 0884-10
1131
560
V peak
V peak
Maximum approved working voltage per IEC 60950-1
Maximum approved working voltage per IEC 60950-1 and VDE V 0884-10
Refers to continuous voltage magnitude imposed across the isolation barrier. See the Insulation Lifetime section for more details.
Rev. C | Page 14 of 22
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
VDD1 1
VIA 2
VIB 3
GND1 4
ADuM1280/
ADuM1285
8
VDD2
7
VOA
TOP VIEW
(Not to Scale)
6
VOB
5
GND2
10444-004
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Figure 4. ADuM1280/ADuM1285 Pin Configuration
Table 29. ADuM1280/ADuM1285 Pin Function Descriptions
Mnemonic
VDD1
VIA
VIB
GND1
GND2
VOB
VOA
VDD2
Description
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).
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.
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).
VDD1 1
VOA 2
VIB 3
GND1 4
ADuM1281/
ADuM1286
8 VDD2
TOP VIEW
(Not to Scale)
6 VOB
7 VIA
5 GND2
10444-005
Pin No.
1
2
3
4
5
6
7
8
Figure 5. ADuM1281/ADuM1286 Pin Configuration
Table 30. ADuM1281/ADuM1286 Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
Mnemonic
VDD1
VOA
VIB
GND1
GND2
VOB
VIA
VDD2
Description
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).
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.
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.
Rev. C | Page 15 of 22
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Data Sheet
Table 31. ADuM1280 Truth Table (Positive Logic)
VIA Input
H
L
H
L
L
VIB Input
H
L
L
H
L
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
Notes
Outputs return to the input state within
1.6 µs of VDDI power restoration.
Outputs return to the input state within
1.6 µs of VDDO power restoration.
Table 32. ADuM1281 Truth Table (Positive Logic)
VIA Input
H
L
H
L
X
VIB Input
H
L
L
H
L
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
L
X
Powered
Unpowered
H
Indeterminate
Notes
Outputs return to the input state within
1.6 µs of VDD1 power restoration.
Outputs return to the input state within
1.6 µs of VDDO power restoration.
Table 33. ADuM1285 Truth Table (Positive Logic)
VIA Input
H
L
H
L
L
VIB Input
H
L
L
H
L
VDD1 State
Powered
Powered
Powered
Powered
Unpowered
VDD2 State
Powered
Powered
Powered
Powered
Powered
VOA Output
H
L
H
L
L
VOB Output
H
L
L
H
L
X
X
Powered
Unpowered
Indeterminate
Indeterminate
Notes
Outputs return to the input state within
1.6 µs of VDDI power restoration.
Outputs return to the input state within
1.6 µs of VDDO power restoration.
Table 34. ADuM1286 Truth Table (Positive Logic)
VIA Input
H
L
H
L
X
VIB Input
H
L
L
H
L
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
L
L
X
Powered
Unpowered
L
Indeterminate
Rev. C | Page 16 of 22
Notes
Outputs return to the input state within
1.6 µs of VDD1 power restoration.
Outputs return to the input state within
1.6 µs of VDDO power restoration.
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
TYPICAL PERFORMANCE CHARACTERISTICS
20
10
8
CURRENT (mA)
CURRENT (mA)
15
6
5V
3V
4
5V
10
3V
5
0
10
20
30
40
50
60
70
80
90
100
DATA RATE (Mbps)
0
10444-006
0
0
10
20
30
40
50
60
70
80
90
100
DATA RATE (Mbps)
Figure 6. Typical Supply Current per Input Channel vs. Data Rate
for 5 V and 3 V Operation
10444-009
2
Figure 9. Typical ADuM1280 or ADuM1285 VDD1 Supply Current vs.
Data Rate for 5 V and 3 V Operation
10
20
8
CURRENT (mA)
CURRENT (mA)
15
6
4
5V
10
5V
5
2
0
10
20
30
40
50
60
70
80
90
100
DATA RATE (Mbps)
0
10444-007
0
0
10
20
30
40
50
60
70
80
90
100
DATA RATE (Mbps)
Figure 7. Typical Supply Current per Output Channel vs. Data Rate
for 5 V and 3 V Operation (No Output Load)
10444-010
3V
3V
Figure 10. Typical ADuM1280 or ADuM1285 VDD2 Supply Current vs.
Data Rate for 5 V and 3 V Operation
10
20
8
CURRENT (mA)
6
5V
4
10
5V
3V
5
2
0
0
10
20
30
40
50
60
70
80
90
100
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)
0
0
10
20
30
40
50
60
DATA RATE (Mbps)
70
80
90
100
10444-011
3V
10444-008
CURRENT (mA)
15
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-tooutput propagation delay time for a high-to-low transition may
differ from the propagation delay time of a low-to-high transition.
50%
tPHL
OUTPUT (VOx)
50%
10444-012
tPLH
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.
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.
100
MAXIMUM ALLOWABLE MAGNETIC FLUX
DENSITY (kgauss)
Propagation delay skew refers to the maximum amount the
propagation delay differs between multiple ADuM1280/
ADuM1281/ADuM1285/ADuM1286 components operating
under the same conditions.
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.
10
1
0.1
0.01
0.001
1k
1M
10k
100k
10M
MAGNETIC FIELD FREQUENCY (Hz)
100M
Figure 13. Maximum Allowable External Magnetic Flux Density
Rev. C | Page 18 of 22
10444-013
INPUT (VIx)
DC CORRECTNESS AND MAGNETIC FIELD
IMMUNITY
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.
DISTANCE = 1m
100
10
DISTANCE = 100mm
1
DISTANCE = 5mm
0.1
0.01
1k
10k
100k
1M
10M
100M
MAGNETIC FIELD FREQUENCY (Hz)
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.
10444-014
MAXIMUM ALLOWABLE CURRENT (kA)
1000
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 ) × 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) = 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
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.
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.
Rev. C | Page 20 of 22
RATED PEAK VOLTAGE
10444-015
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.
0V
Figure 15. Bipolar AC Waveform
RATED PEAK VOLTAGE
10444-016
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.
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.
0V
Figure 16. Unipolar AC Waveform
RATED PEAK VOLTAGE
10444-017
INSULATION LIFETIME
Data Sheet
0V
Figure 17. DC Waveform
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
OUTLINE DIMENSIONS
5.00 (0.1968)
4.80 (0.1890)
1
5
6.20 (0.2441)
5.80 (0.2284)
4
1.27 (0.0500)
BSC
0.25 (0.0098)
0.10 (0.0040)
COPLANARITY
0.10
SEATING
PLANE
1.75 (0.0688)
1.35 (0.0532)
0.51 (0.0201)
0.31 (0.0122)
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 18. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body (R-8)
Dimensions shown in millimeters (inches)
ORDERING GUIDE
Model 1, 2, 3
ADuM1280ARZ
ADuM1280WARZ
ADuM1280BRZ
ADuM1280WBRZ
ADuM1280CRZ
ADuM1280WCRZ
ADuM1281ARZ
ADuM1281WARZ
ADuM1281BRZ
ADuM1281WBRZ
ADuM1281CRZ
ADuM1281WCRZ
ADuM1285ARZ
ADuM1285WARZ
ADuM1285BRZ
ADuM1285WBRZ
ADuM1285CRZ
ADuM1285WCRZ
ADuM1286ARZ
ADuM1286WARZ
ADuM1286BRZ
ADuM1286WBRZ
ADuM1286CRZ
ADuM1286WCRZ
1
2
3
No. of Inputs,
VDD1 Side
2
2
2
2
2
2
1
1
1
1
1
1
2
2
2
2
2
2
1
1
1
1
1
1
No. of Inputs,
VDD2 Side
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
Max
Data Rate
1 Mbps
1 Mbps
25 Mbps
25 Mbps
100 Mbps
100 Mbps
1 Mbps
1 Mbps
25 Mbps
25 Mbps
100 Mbps
100 Mbps
1 Mbps
1 Mbps
25 Mbps
25 Mbps
100 Mbps
100 Mbps
1 Mbps
1 Mbps
25 Mbps
25 Mbps
100 Mbps
100 Mbps
Max Prop
Delay, 5 V
50
50
35
35
24
24
50
50
35
35
24
24
50
50
35
35
24
24
50
50
35
35
24
24
Output
Default State
High
High
High
High
High
High
High
High
High
High
High
High
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Temperature
Range
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
Package Description
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
Package
Option
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
Z = RoHS Compliant Part.
Tape and reel are available. The addition of an “-RL7” suffix designates a 7” (1,000 units) tape and reel option.
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
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
Data Sheet