ADUM1280CRZ [ADI]
3 kV RMS Dual Channel Digital Isolators; 3千伏RMS双通道数字隔离器
| 型号： | ADUM1280CRZ |
| 厂家： | 
ADI |
| 描述： | 3 kV RMS Dual Channel Digital Isolators |
| 文件： | 总16页 (文件大小：329K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
3 kV RMS Dual Channel Digital Isolators
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
FEATURES
GENERAL DESCRIPTION
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
The ADuM1280/ADuM1281/ADuM1285/ADuM12861 (also
referred to as ADuM128x in this data sheet) 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
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 (pending)
UL recognition: 3000 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice #5A
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 ADuM128x are
independent isolation channels and are available in two channel
configurations with three different data rates up to 100 Mbps
(see the Ordering Guide). All models operate with the supply
voltage on either side ranging from 2.7 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 ADuM128x 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.
VDE Certificate Of Conformity
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
V
IORM = 560 V peak
APPLICATIONS
General-purpose multichannel isolation
Data converter isolation
Industrial field bus isolation
For more information on safety and regulatory approvals, go to
http://www.analog.com/icouplersafety.
FUNCTIONAL BLOCK DIAGRAMS
ADuM1280/
ADuM1281/
ADuM1286
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
V
V
V
V
V
V
V
V
DD1
DD2
OA
OB
DD1
DD2
ADuM1285
ENCODE
DECODE
DECODE
DECODE
ENCODE
DECODE
V
V
V
OA
IA
IB
IA
ENCODE
ENCODE
V
IB
OB
GND
GND
GND
GND
2
1
2
1
Figure 1. ADuM1280/ADuM1285
Figure 2. ADuM1281/ADuM1286
1 Protected by U.S. Patents 5,952,849; 6,873,065; 6,903,578; and 7,075,329. Other patents are pending.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rightsof third parties that may result fromits use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks andregisteredtrademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2012 Analog Devices, Inc. All rights reserved.
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Recommended Operating Conditions .......................................8
Absolute Maximum Ratings ............................................................9
ESD Caution...................................................................................9
Pin Configurations and Function Descriptions......................... 10
Typical Performance Characteristics ........................................... 12
Applications Information .............................................................. 13
PC Board Layout ........................................................................ 13
Propagation Delay-Related Parameters................................... 13
DC Correctness and Magnetic Field Immunity..................... 13
Power Consumption .................................................................. 14
Insulation Lifetime..................................................................... 15
Outline Dimensions....................................................................... 16
Ordering Guide .......................................................................... 16
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagrams............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics—5 V Operation................................ 3
Electrical Characteristics—3 V Operation................................ 4
Electrical Characteristics—Mixed 5 V/3 V Operation............ 5
Electrical Characteristics—Mixed 3 V/5 V Operation............ 6
Package Characteristics ............................................................... 7
Regulatory Information............................................................... 7
Insulation and Safety-Related Specifications............................ 7
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
Insulation Characteristics............................................................ 8
REVISION HISTORY
5/12—Revision 0: Initial Version
Rev. 0 | Page 2 of 16
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—5 V OPERATION
All typical specifications are at TA = 25°C, VDD1 = VDD2 = 5 V. Minimum/maximum specifications apply over the entire recommended
operation range: 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 Grade
Typ
B Grade
Typ
C Grade
Typ
Parameter
Symbol
Min
Min
Min
Max
Min
10
Max
Unit
Test Conditions
SWITCHING SPECIFICATIONS
Pulse Width
PW
1000
40
Within PWD limit
ns
Data Rate
1
25
35
3
Within PWD limit
100
24
2
Mbps
ns
ns
ps/°C
ns
Propagation Delay
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew
tPHL, tPLH
PWD
50
10
13
50% input to 50% output
18
|tPLH − tPHL
|
7
2
3
1.5
tPSK
38
12
Between any two units
at same operating
conditions
9
Channel Matching
Codirectional
Opposing Direction
Jitter
tPSKCD
tPSKOD
5
3
6
2
5
ns
ns
ns
10
2
1
Table 2.
1 Mbps–A, B, C Grade
25 Mbps–B Grade
100 Mbps–B Grade
Parameter
Symbol
Min
Typ
Min
Min
Typ
Max
Min
Typ
Max
Unit
Test Conditions
SUPPLY CURRENT
ADuM1280/ADuM1285
No load
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
7.0
7.0
6.0
6.4
20
9.5
15
25
15
19
19
mA
mA
mA
mA
ADuM1281/ADuM1286
15.6
Table 3. For All Models
Parameter
Symbol Min
Typ
Max
Unit
Test Conditions
DC SPECIFICATIONS
Logic High Input Threshold
Logic Low Input Threshold
Logic High Output Voltages
VIH
VIL
0.7 VDDx
VDDx − 0.1
V
0.3 VDDx
V
VOH
5.0
4.8
0.0
0.2
V
V
V
V
IOx = −20 µA, VIx = VIxH
IOx = −4 mA, VIx = VIxH
IOx = 20 µA, VIx = VIxL
IOx = 4 mA, VIx = VIxL
0 V ≤ VIx ≤ VDDx
VDDx − 0.4
Logic Low Output Voltages
VOL
II
0.1
0.4
+10
Input Current per Channel
Supply Current per Channel
−10
+0.01
µA
Quiescent Input Supply Current
Quiescent Output Supply Current
Dynamic Input Supply Current
Dynamic Output Supply Current
Undervoltage Lockout
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
0.54
1.6
0.09
0.04
0.8
2.0
mA
mA
mA/Mbps
mA/Mbps
Positive VDDx Threshold
VDDXUV+
VDDXUV-
VDDXUVH
2.6
2.4
0.2
V
V
V
Negative VDDx Threshold
VDDx Hysteresis
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity1
tR/tF
|CM|
2.5
35
ns
kV/µs
10% to 90%
VIx = VDDx, VCM = 1000 V,
25
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. 0 | Page 3 of 16
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Data Sheet
ELECTRICAL CHARACTERISTICS—3 V OPERATION
All typical specifications are at TA = 25°C, VDD1 = VDD2 = 3.0 V. Minimum/maximum specifications apply over the entire recommended
operation range: 2.7 V ≤ VDD1 ≤ 3.6 V, 2.7 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
Typ
B Grade
Typ
C Grade
Typ
Parameter
Symbol
Min
Min
Min
Max
Min
10
Max
Unit
Test Conditions
SWITCHING SPECIFICATIONS
Pulse Width
PW
1000
40
Within PWD limit
ns
Data Rate
1
25
35
3
Within PWD limit
100
33
2.5
Mbps
ns
ns
ps/°C
ns
Propagation Delay
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew
tPHL, tPLH
PWD
50
10
20
50% input to 50% output
25
|tPLH − tPHL|
7
2
3
1.5
tPSK
38
16
Between any two units
at same operating
conditions
12
Channel Matching
Codirectional
tPSKCD
tPSKOD
5
3
6
2.5
5
ns
ns
ns
Opposing-Direction
10
Jitter
2
1
7
Codirectional channel matchi ng is the absol ute value o f the diff erence in propa gation delays betwee n any two c hannels with i nputs on the same side of the isolati on barrier. Opposing-directio nal channel matching is the abs olute val ue o f the differe nce in propagati on delays betwee n any two c hannels wit h inputs on opposi ng sides of the is olation barrier.
Table 5.
1 Mbps–A, B, C Grade
25 Mbps–B, C Grade
100 Mbps–C Grade
Parameter
Symbol
Min
Typ
Min
Min
Typ
Max
Min
Typ
Max
Unit
Test Conditions
SUPPLY CURRENT
No load
ADuM1280/ADuM1285
IDD1
IDD2
IDD1
IDD2
1.4
3.5
2.1
2.3
mA
mA
mA
mA
0.75
2.0
1.6
5.1
2.7
3.8
3.9
9.0
4.6
5.0
6.2
17
4.8
11
11
23
9
15
15
ADuM1281/ADuM1286
1.7
Table 6. For All Models
Parameter
Symbol Min
Typ
Max
Unit
Test Conditions
DC SPECIFICATIONS
Logic High Input Threshold
Logic Low Input Threshold
Logic High Output Voltages
VIH
VIL
0.7 VDDx
V
0.3 VDDx
V
VOH
VDDx − 0.1
VDDx − 0.4
3.0
2.8
0.0
0.2
V
V
V
V
IOx = −20 µA, VIx = VIxH
IOx = −4 mA, VIx = VIxH
IOx = 20 µA, VIx = VIxL
IOx = 4 mA, VIx = VIxL
0 V ≤ VIx ≤ VDDx
Logic Low Output Voltages
VOL
II
0.1
0.4
Input Current per Channel
Supply Current per Channel
−10
+0.01
+10
µA
Quiescent Input Supply Current
Quiescent Output Supply Current
Dynamic Input Supply Current
Dynamic Output Supply Current
Undervoltage Lockout
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
0.4
1.2
0.08
0.015
0.6
1.7
mA
mA
mA/Mbps
mA/Mbps
Positive VDDx Threshold
Negative VDDx Threshold
VDDX Hysteresis
VDDxUV+
VDDxUV−
VDDxUVH
2.6
2.4
0.2
V
V
V
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity1
tR/tF
3
ns
10% to 90%
VIx = VDDx, VCM = 1000 V,
|CM|
25
35
kV/µs
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. 0 | Page 4 of 16
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
ELECTRICAL CHARACTERISTICS—MIXED 5 V/3 V OPERATION
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, 2.7 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
Typ
B Grade
Typ
C Grade
Typ
Parameter
Symbol
Min
Min
Min
Max
Min
10
Max
Unit
Test Conditions
SWITCHING SPECIFICATIONS
Pulse Width
PW
1000
40
Within PWD limit
ns
Data Rate
1
25
35
3
Within PWD limit
100
26
2
Mbps
ns
ns
Propagation Delay
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew
tPHL, tPLH
PWD
50
10
13
50% input to 50% output
20
|tPLH − tPHL
|
ps/C
7
2
3
1.5
tPSK
38
16
Between any two units
at same operating
conditions
12
ns
Channel Matching
Codirectional
tPSKCD
tPSKOD
5
3
6
2
5
ns
ns
ns
Opposing-Direction
10
Jitter
2
1
7
Codirectional channel matchi ng is the absol ute value o f the diff erence in propa gation delays betwee n any two c hannels with i nputs on the same side of the isolati on barrier. Opposing-directio nal channel matching is the abs olute val ue o f the differe nce in propagati on delays betwee n any two c hannels wit h inputs on opposi ng sides of the is olatio n barrier.
Table 8.
1 Mbps–A, B, C Grade
25 Mbps–B, C Grade
100 Mbps–C Grade
Parameter
Symbol
Min
Typ
Min
Min
Typ
Max
Min
Typ
Max
Unit
Test Conditions
SUPPLY CURRENT
No load
ADuM1280/ADuM1285
IDD1
IDD2
IDD1
IDD2
1.6
3.5
2.6
2.3
7.0
4.6
6.0
6.2
25
9.0
19
15
mA
mA
mA
mA
1.1
2.0
2.1
1.7
6.2
2.7
4.9
3.9
20
4.8
15
11
ADuM1281/ADuM1286
Table 9. For All Models
Parameter
Symbol Min
Typ
Max
Unit
Test Conditions
DC SPECIFICATIONS
Logic High Input Threshold
Logic Low Input Threshold
Logic High Output Voltages
VIH
VIL
0.7 VDDx
VDDx − 0.1
V
0.3 VDDx
V
VOH
VDDx
VDDx − 0.2
0.0
V
V
V
V
IOx = −20 µA, VIx = VIxH
IOx = −4 mA, VIx = VIxH
IOx = 20 µA, VIx = VIxL
IOx = 4 mA, VIx = VIxL
0 V ≤ VIx ≤ VDDx
VDDx − 0.4
Logic Low Output Voltages
VOL
II
0.1
0.4
0.2
Input Current per Channel
Supply Current per Channel
−10
+10
µA
+0.01
Quiescent Input Supply Current
Quiescent Output Supply Current
Dynamic Input Supply Current
Dynamic Output Supply Current
Undervoltage Lockout
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
0.75
2.0
mA
mA
0.54
1.2
0.09
0.02
mA/Mbps
mA/Mbps
Positive VDDX Threshold
VDDxUV+
VDDxUV−
VDDxUVH
V
V
V
2.6
2.4
0.2
Negative VDDX Threshold
VDDX Hysteresis
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity1
tR/tF
ns
10% to 90%
2.5
35
|CM|
25
kV/µs
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
Refresh Period
tr
µs
1.6
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. 0 | Page 5 of 16
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Data Sheet
ELECTRICAL CHARACTERISTICS—MIXED 3 V/5 V OPERATION
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: 2.7 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
Typ
B Grade
Typ
C Grade
Typ
Parameter
Symbol
Min
Min
Min
Max
Min
10
Max
Unit
Test Conditions
SWITCHING SPECIFICATIONS
Pulse Width
PW
1000
40
Within PWD limit
ns
Data Rate
1
25
35
3
Within PWD limit
100
30
2.5
Mbps
ns
ns
ps/C
ns
Propagation Delay
Pulse Width Distortion
Change vs. Temperature
Propagation Delay Skew
tPHL, tPLH
PWD
50
10
16
50% input to 50% output
24
|tPLH − tPHL|
7
2
3
2
1.5
tPSK
38
16
Between any two units at
same operating conditions
12
Channel Matching
Codirectional
tPSKCD
tPSKOD
5
3
6
2.5
5
ns
ns
ns
Opposing-Direction
10
Jitter
1
7
Codirectional channel matchi ng is the absol ute value o f the diff erence in propa gation delays betwee n any two c hannels with i nputs on the same side of the isolati on barrier. Opposing-directio nal channel matching is the abs olute val ue o f the differe nce in propagati on delays betwee n any two c hannels wit h inputs on opposi ng sides of the is olation barrier.
Table 11.
1 Mbps–A, B, C Grade
25 Mbps–B, C Grade
100 Mbps–C Grade
Parameter
Symbol
Min
Typ
Min
Min
Typ
Max
Min
Typ
Max
Unit
Test Conditions
SUPPLY CURRENT
No load
ADuM1280/ADuM1285
IDD1
IDD2
IDD1
IDD2
mA
mA
mA
mA
0.75
2.7
1.6
1.4
4.5
2.1
2.3
5.1
4.8
3.8
3.9
9.0
7.0
5.0
6.2
17
9.5
11
11
23
15
15
15
ADuM1281/ADuM1286
1.7
Table 12. For All Models
Parameter
Symbol Min
Typ
Max
Unit
Test Conditions
DC SPECIFICATIONS
Logic High Input Threshold
Logic Low Input Threshold
Logic High Output Voltages
VIH
VIL
0.7 VDDx
V
0.3 VDDx
V
VOH
VDDx − 0.1
VDDx − 0.4
VDDx
VDDx − 0.2
0.0
V
V
V
V
IOx = −20 µA, VIx = VIxH
IOx = −4 mA, VIx = VIxH
IOx = 20 µA, VIx = VIxL
IOx = 4 mA, VIx = VIxL
0 V ≤ VIx ≤ VDDx
Logic Low Output Voltages
VOL
II
0.1
0.4
+10
0.2
Input Current per Channel
Supply Current per Channel
−10
µA
+0.01
Quiescent Input Supply Current
Quiescent Output Supply Current
Dynamic Input Supply Current
Dynamic Output Supply Current
IDDI(Q)
IDDO(Q)
IDDI(D)
IDDO(D)
0.75
2.0
mA
mA
0.4
1.6
0.08
mA/Mbps
mA/Mbps
0.03
Undervoltage-Lockout
Positive VDDX Threshold
Negative VDDX Threshold
VDDX Hysteresis
VDDxUV+
VDDxUV−
VDDxUVH
V
V
V
2.6
2.4
0.2
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity1
tR/tF
ns
10% to 90%
2.5
35
|CM|
25
kV/µs
VIx = VDDx, VCM = 1000 V,
transient magnitude = 800 V
Refresh Period
tr
µs
1.6
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. 0 | Page 6 of 16
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
PACKAGE CHARACTERISTICS
Table 13.
Parameter
Symbol Min Typ Max Unit
Test Conditions
Resistance (Input-to-Output)1
Capacitance (Input-to-Output)1
Input Capacitance2
RI-O
CI-O
CI
1013
2
4.0
85
Ω
pF
pF
f = 1 MHz
IC Junction-to-Ambient Thermal
Resistance
θJA
°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 ADuM128x is pending approval by the organizations listed in Table 14. See Table 18 and Table 19 for recommended maximum
working voltages for specific cross-isolation waveforms and insulation levels.
Table 14.
UL (Pending)
CSA (Pending)
VDE (Pending)
Recognized under UL 1577
Approved under CSA Component Acceptance
Notice #5A
Certified according to DIN V VDE V 0884-10
(VDE V 0884-10): 2006-122
Component Recognition Program1
Single Protection, 3000 V RMS
Isolation Voltage
Basic insulation per CSA 60950-1-03 and
IEC 60950-1, 400 V rms (565 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 ADuM128x 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 ADuM128x 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 15.
Parameter
Symbol Value
Unit
Conditions
Rated Dielectric Insulation Voltage
Minimum External Air Gap (Clearance)
3000
4.0
V rms
1-minute duration
L(I01)
L(I02)
mm min Measured from input terminals to output terminals,
shortest distance through air
mm min Measured from input terminals to output terminals,
shortest distance path along body
Minimum External Tracking (Creepage)
4.0
Minimum Internal Gap (Internal Clearance)
Tracking Resistance (Comparative Tracking Index)
Isolation Group
0.017
>400
II
mm min Insulation distance through insulation
CTI
V
DIN IEC 112/VDE 0303 Part 1
Material Group (DIN VDE 0110, 1/89, Table 1)
Rev. 0 | Page 7 of 16
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Data Sheet
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 16.
Description
Conditions
Symbol Characteristic Unit
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
I to IV
I to III
I to II
40/105/21
2
VIORM
Vpd(m)
560
1050
VPEAK
VPEAK
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
Vpd(m)
Vpd(m)
840
672
VPEAK
VPEAK
After Input and/or Safety Test Subgroup 2
and Subgroup 3
Highest Allowable Overvoltage
Withstand Isolation Voltage
Surge Isolation Voltage
VIOTM
VISO
VIOSM
4000
3000
6000
VPEAK
VRMS
VPEAK
1 minute withstand rating
VPEAK = 10 kV, 1.2 µs rise time, 50 µs, 50% fall time
Safety Limiting Values
Maximum value allowed in the event of a failure
(see Figure 3)
Case Temperature
Side 1 IDD1 Current
Insulation Resistance at TS
TS
IS1
RS
150
290
>109
°C
mA
Ω
VIO = 500 V
300
250
200
150
100
50
RECOMMENDED OPERATING CONDITIONS
Table 17.
Parameter
Symbol
Min Max Unit
Operating Temperature
Supply Voltages1
Input Signal Rise and Fall Times
TA
−40 +125 °C
VDD1, VDD2 2.7
5.5
1.0
V
ms
1 See the DC Correctness and Magnetic Field Immunity section.
0
0
50
100
150
200
AMBIENT TEMPERATURE (°C)
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. 0 | Page 8 of 16
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Table 18.
Parameter
Rating
Storage Temperature (TST) Range
Ambient Operating Temperature
(TA) Range
−65°C to +150°C
−40°C to +125°C
Supply Voltages (VDD1, VDD2
Input Voltages (VIA, VIB)
Output Voltages (VOA, VOB)
)
−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
Average Output Current per Pin1
Side 1 (IO1)
−10 mA to +10 mA
Side 2 (IO2)
Common-Mode Transients2
−10 mA to +10 mA
−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.
Table 19. Maximum Continuous Working Voltage1
Parameter
Max
Unit
Constraint
AC Voltage, Bipolar Waveform
AC Voltage, Unipolar Waveform
Basic Insulation
Reinforced Insulation
DC Voltage
565
V peak
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
Basic Insulation
Reinforced Insulation
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
1 Refers to continuous voltage magnitude imposed across the isolation barrier. See the
Insulation Lifetime section for more details.
Rev. 0 | Page 9 of 16
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Data Sheet
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
1
2
3
4
8
7
6
5
V
V
V
V
DD1
DD2
OA
OB
ADuM1280/
ADuM1285
TOP VIEW
(Not to Scale)
V
IA
V
IB
GND
GND
2
1
Figure 4. ADuM1280/ADuM1285 Pin Configuration
Table 20. ADuM1280/ADuM1285 Pin Function Descriptions
Pin No.
Mnemonic
Description
1
2
3
4
5
6
7
8
VDD1
VIA
VIB
GND1
GND2
VOB
VOA
VDD2
2.7 V to 5.5 V Supply Voltage for Isolator Side 1.
Logic Input A.
Logic Input B.
Ground 1. Ground reference for Isolator Side 1.
Ground 2. Ground reference for Isolator Side 2.
Logic Output B.
Logic Output A.
2.7 V to 5.5 V Supply Voltage for Isolator Side 2.
1
2
3
4
8
7
6
5
V
V
V
V
DD1
DD2
ADuM1281/
ADuM1286
TOP VIEW
(Not to Scale)
V
OA
IA
V
IB
GND
OB
GND
1
2
Figure 5. ADuM1281/ADuM1286 Pin Configuration
Table 21. ADuM1281/ADuM1286 Pin Function Descriptions
Pin No.
Mnemonic
Description
1
2
3
4
5
6
7
8
VDD1
VOA
VIB
GND1
GND2
VOB
VIA
VDD2
2.7 V to 5.5 V Supply Voltage for Isolator Side 1.
Logic Output A.
Logic Input B.
Ground 1. Ground reference for Isolator Side 1.
Ground 2. Ground reference for Isolator Side 2.
Logic Output B.
Logic Input A.
2.7 V to 5.5 V Supply Voltage for Isolator Side 2.
For specific layout guidelines, refer to the AN-1109 Application Note, Recommendations for Control of Radiated Emissions with iCoupler
Devices.
Rev. 0 | Page 10 of 16
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Table 22. ADuM1280 Truth Table (Positive Logic)
VIA Input
VIB Input
VDD1 State
Powered
Powered
Powered
Powered
Unpowered
VDD2 State
Powered
Powered
Powered
Powered
Powered
VOA Output
VOB Output
Notes
H
L
H
L
H
L
L
H
L
H
L
H
L
H
L
L
H
H
L
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 23. ADuM1281 Truth Table (Positive Logic)
VIA Input
VIB Input
VDD1 State
Powered
Powered
Powered
Powered
Unpowered
VDD2 State
Powered
Powered
Powered
Powered
Powered
VOA Output
VOB Output
Notes
H
L
H
L
H
L
L
H
L
H
L
H
L
H
L
L
H
H
X
Indeterminate
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 24. ADuM1285 Truth Table (Positive Logic)
VIA Input
VIB Input
VDD1 State
Powered
Powered
Powered
Powered
Unpowered
VDD2 State
Powered
Powered
Powered
Powered
Powered
VOA Output
VOB Output
Notes
H
L
H
L
H
L
L
H
L
H
L
H
L
H
L
L
H
L
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 25. ADuM1286 Truth Table (Positive Logic)
VIA Input
VIB Input
VDD1 State
Powered
Powered
Powered
Powered
Unpowered
VDD2 State
Powered
Powered
Powered
Powered
Powered
VOA Output
VOB Output
Notes
H
L
H
L
H
L
L
H
L
H
L
H
L
H
L
L
H
L
X
Indeterminate
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. 0 | Page 11 of 16
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
10
20
15
10
5
8
6
5V
3V
5V
3V
4
2
0
0
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40
50
60
70
80
90
100
DATA RATE (Mbps)
DATA RATE (Mbps)
Figure 6. Typical Supply Current per Input Channel vs. Data Rate
for 5 V and 3 V Operation
Figure 9. Typical ADuM1280 or ADuM1285 VDD1 Supply Current vs.
Data Rate for 5 V and 3 V Operation
10
20
8
15
6
10
4
5V
5V
5
2
3V
3V
0
0
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40
50
60
70
80
90
100
DATA RATE (Mbps)
DATA RATE (Mbps)
Figure 7. Typical Supply Current per Output Channel vs. Data Rate
for 5 V and 3 V Operation (No Output Load)
Figure 10. Typical ADuM1280 or ADuM1285 VDD2 Supply Current vs.
Data Rate for 5 V and 3 V Operation
10
20
8
15
6
5V
10
4
5V
3V
5
2
0
3V
0
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40
50
60
70
80
90
100
DATA RATE (Mbps)
DATA RATE (Mbps)
Figure 8. Typical Supply Current per Output Channel vs. Data Rate
for 5 V and 3 V Operation (15 pF Output Load)
Figure 11. Typical ADuM1281 or ADuM1286 VDD1 or VDD2 Supply Current vs.
Data Rate for 5 V and 3 V Operation
Rev. 0 | Page 12 of 16
Data Sheet
ADuM1280/ADuM1281/ADuM1285/ADuM1286
APPLICATIONS INFORMATION
DC CORRECTNESS AND MAGNETIC FIELD
IMMUNITY
PC BOARD LAYOUT
The ADuM128x digital isolator requires no external interface
circuitry for the logic interfaces. Power supply bypassing is
strongly recommended at both input and output supply pins
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.
V
DD1 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 ADuM128x 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.
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.
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.
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
INPUT (V
)
50%
Ix
2
V = (−dβ/dt)∑πrn ; n = 1, 2, …, N
tPLH
tPHL
where:
OUTPUT (V
)
50%
Ox
β is the magnetic flux density.
Figure 12. Propagation Delay Parameters
rn is the radius of the nth turn in the receiving coil.
N is the number of turns in the receiving coil.
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.
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
Channel-to-channel matching refers to the maximum amount
the propagation delay differs between channels within a single
ADuM128x component.
Propagation delay skew refers to the maximum amount the
propagation delay differs between multiple ADuM128x
components operating under the same conditions.
10
1
0.1
0.01
0.001
1k
10k
100k
1M
10M
100M
MAGNETIC FIELD FREQUENCY (Hz)
Figure 13. Maximum Allowable External Magnetic Flux Density
Rev. 0 | Page 13 of 16
ADuM1280/ADuM1281/ADuM1285/ADuM1286
Data Sheet
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.
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 ADuM128x
isolator is a function of the supply voltage, the data rate of
the channel, and the output load of the channel.
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 magni-
tudes 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,
one would have to place a 0.2 kA current 5 mm away from the
ADuM1280 to affect component operation.
For each input channel, the supply current is given by
I
DDI = IDDI (Q)
f ≤ 0.5 fr
f > 0.5 fr
IDDI = IDDI (D) × (2f − fr) + IDDI (Q)
For each output channel, the supply current is given by
DDO = IDDO (Q) f ≤ 0.5 fr
DDO = (IDDO (D) + (0.5 × 10−3) × CL × VDDO) × (2f − fr) + IDDO (Q)
f > 0.5 fr
I
I
1000
DISTANCE = 1m
where:
DDI (D), IDDO (D) are the input and output dynamic supply currents
100
I
per channel (mA/Mbps).
CL is the output load capacitance (pF).
10
VDDO is the output supply voltage (V).
DISTANCE = 100mm
f is the input logic signal frequency (MHz); it is half the input
data rate, expressed in units of Mbps.
1
DISTANCE = 5mm
fr is the input stage refresh rate (Mbps) = 1/tr (µs).
0.1
IDDI (Q), IDDO (Q) are the specified input and output quiescent
supply currents (mA).
0.01
To calculate the total VDD1 and VDD2 supply current, the supply
currents for each input and output channel corresponding to
1k
10k
100k
1M
10M
100M
MAGNETIC FIELD FREQUENCY (Hz)
V
DD1 and VDD2 are calculated and totaled. Figure 6 and Figure 7
Figure 14. Maximum Allowable Current for
Various Current to ADuM1280 Spacings
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
V
DD2 supply current as a function of data rate for ADuM1280/
ADuM1281 channel configurations.
Rev. 0 | Page 14 of 16
Data Sheet
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 19 can be applied while main-
taining 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 19.
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 ADuM128x.
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 19 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.
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.
RATED PEAK VOLTAGE
0V
Figure 15. Bipolar AC Waveform
The insulation lifetime of the ADuM128x 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.
RATED PEAK VOLTAGE
0V
Figure 16. Unipolar AC Waveform
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.
RATED PEAK VOLTAGE
0V
Figure 17. DC Waveform
Rev. 0 | Page 15 of 16
ADuM1280/ADuM1281/ADuM1285/ADuM1286
OUTLINE DIMENSIONS
Data Sheet
5.00 (0.1968)
4.80 (0.1890)
8
1
5
4
6.20 (0.2441)
5.80 (0.2284)
4.00 (0.1574)
3.80 (0.1497)
0.50 (0.0196)
0.25 (0.0099)
1.27 (0.0500)
BSC
45°
1.75 (0.0688)
1.35 (0.0532)
0.25 (0.0098)
0.10 (0.0040)
8°
0°
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
1.27 (0.0500)
0.40 (0.0157)
0.25 (0.0098)
0.17 (0.0067)
SEATING
PLANE
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.
Figure 19-Lead Standard Small Outline Package [SOIC_N]
Narrow Body (R-8)
Dimensions shown in millimeters (inches)
ORDERING GUIDE
No. of Inputs, No. of Inputs, Max
Max Prop Output
Temperature
Package
Option
Model1
VDD1 Side
VDD2 Side
Data Rate Delay, 5 V Default State Range
Package Description
ADuM1280ARZ
2
2
2
2
2
2
1
1
1
1
1
1
2
2
2
2
2
2
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
1 Mbps
1 Mbps
25 Mbps
25 Mbps
50
50
35
35
High
High
High
High
High
High
High
High
High
High
High
High
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
−40°C to +125°C 8-Lead SOIC_N
R-8
ADuM1280ARZ-RL7
ADuM1280BRZ
−40°C to +125°C 8-Lead SOIC_N 7” Tape and Reel R-8
−40°C to +125°C 8-Lead SOIC_N
R-8
−40°C to +125°C 8-Lead SOIC_N 7” Tape and Reel R-8
−40°C to +125°C 8-Lead SOIC_N
R-8
−40°C to +125°C 8-Lead SOIC_N 7” Tape and Reel R-8
−40°C to +125°C 8-Lead SOIC_N
R-8
−40°C to +125°C 8-Lead SOIC_N 7” Tape and Reel R-8
−40°C to +125°C 8-Lead SOIC_N
R-8
−40°C to +125°C 8-Lead SOIC_N 7” Tape and Reel R-8
−40°C to +125°C 8-Lead SOIC_N
R-8
−40°C to +125°C 8-Lead SOIC_N 7” Tape and Reel R-8
−40°C to +125°C 8-Lead SOIC_N
R-8
−40°C to +125°C 8-Lead SOIC_N 7” Tape and Reel R-8
−40°C to +125°C 8-Lead SOIC_N
R-8
−40°C to +125°C 8-Lead SOIC_N 7” Tape and Reel R-8
−40°C to +125°C 8-Lead SOIC_N
R-8
−40°C to +125°C 8-Lead SOIC_N 7” Tape and Reel R-8
−40°C to +125°C 8-Lead SOIC_N
R-8
−40°C to +125°C 8-Lead SOIC_N 7” Tape and Reel R-8
−40°C to +125°C 8-Lead SOIC_N
R-8
−40°C to +125°C 8-Lead SOIC_N 7” Tape and Reel R-8
−40°C to +125°C 8-Lead SOIC_N
R-8
−40°C to +125°C 8-Lead SOIC_N 7” Tape and Reel R-8
ADuM1280BRZ-RL7
ADuM1280CRZ
100 Mbps 24
100 Mbps 24
ADuM1280CRZ-RL7
ADuM1281ARZ
1 Mbps
1 Mbps
25 Mbps
25 Mbps
50
50
35
35
ADuM1281ARZ-RL7
ADuM1281BRZ
ADuM1281BRZ-RL7
ADuM1281CRZ
100 Mbps 24
100 Mbps 24
ADuM1281CRZ-RL7
ADuM1285ARZ
1 Mbps
1 Mbps
25 Mbps
25 Mbps
50
50
35
35
ADuM1285ARZ-RL7
ADuM1285BRZ
ADuM1285BRZ-RL7
ADuM1285CRZ
100 Mbps 24
100 Mbps 24
ADuM1285CRZ-RL7
ADuM1286ARZ
1 Mbps
1 Mbps
25 Mbps
25 Mbps
50
50
35
35
ADuM1286ARZ-RL7
ADuM1286BRZ
ADuM1286BRZ-RL7
ADuM1286CRZ
100 Mbps 24
100 Mbps 24
ADuM1286CRZ-RL7
1 Z = RoHS Compliant Part.
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