PDF Data Sheet Rev. A

3.75 kV, 7-Channel, SPIsolator
Multiple Slave, Digital Isolator for SPI
ADuM3154
Data Sheet
FUNCTIONAL BLOCK DIAGRAM
Supports up to 17 MHz SPI clock speed
4 high speed, low propagation delay, SPI signal isolation
channels
Supports up to 4 slave devices
20-lead SSOP package with 5.1 mm creepage
High temperature operation: 125°C
High common-mode transient immunity: >25 kV/µs
Safety and regulatory approvals
UL recognition per UL 1577
3750 V rms for 1 minute
CSA Component Acceptance Notice 5A
VDE certificate of conformity
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
VIORM = 565 V peak
VDD1 1
20 VDD2
ADuM3154
GND1 2
ENCODE
DECODE
MCLK 3
ENCODE
DECODE
MO 4
DECODE
ENCODE
MI 5
ENCODE
DECODE
18 SCLK
17 SI
16 SO
15 SS0
MSS 6
SSA0 7
SSA1 8
19 GND2
14 SS1
MUX
CONTROL
BLOCK
13 SS2
12 SS3
NIC 9
GND1 10
CONTROL
BLOCK
NIC = NOT INTERNALLY CONNECTED
11 GND2
12369-001
FEATURES
Figure 1.
APPLICATIONS
Industrial programmable logic controllers (PLCs)
Sensor isolation
GENERAL DESCRIPTION
The ADuM31541 is an SPIsolator™ digital isolator optimized for
a serial peripheral interface (SPI) that includes support for up to
four slave devices. Based on the Analog Devices, Inc., iCoupler®
chip scale transformer technology, the low propagation delay and
jitter in the CLK, MO/SI, MI/SO, and SS SPI bus signals support
SPI clock rates of up to 17 MHz.
The ADuM3154 isolator also provides a slave select multiplexing
system that allows up to four slave devices to be serviced from
one isolator. When a target slave is selected, the slave select
signal propagates to the desired output with low propagation
delay, allowing tight timing control. The isolated SSx is addressed
through a 250 kbps low speed, 2-channel address bus, allowing
the target slave device to be changed in as little as 2.5 µs.
1
Table 1. Related Products
Product
ADuM3150
ADuM3151/ADuM3152/
ADuM3153
ADuM4150
ADuM4151/ADuM4152/
ADuM4153
ADuM4154
Description
3. 75 kV, high speed, clock
delayed SPIsolator
3.75 kV, multichannel SPIsolator
5 kV, high speed, clock delayed
SPIsolator
5 kV, multichannel SPI solator
5 kV, multiple slave SPIsolator
Protected by U.S. Patents 5,952,849; 6,262,600; 6,873,065; and 7075329. Other patents are pending.
Rev. A
Document Feedback
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Technical Support
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ADuM3154
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Absolute Maximum Ratings ......................................................... 13
Applications ....................................................................................... 1
ESD Caution................................................................................ 13
Functional Block Diagram .............................................................. 1
Pin Configuration and Function Descriptions........................... 14
General Description ......................................................................... 1
Typical Performance Characteristics ........................................... 16
Revision History ............................................................................... 2
Applications Information .............................................................. 17
Specifications..................................................................................... 3
Introduction ................................................................................ 17
Electrical Characteristics—5 V Operation................................ 3
Printed Circuit Board (PCB) Layout ....................................... 19
Electrical Characteristics—3.3 V Operation ............................ 5
Propagation Delay Related Parameters ................................... 19
Electrical Characteristics—Mixed 5 V/3.3 V Operation ........ 7
DC Correctness and Magnetic Field Immunity ..................... 19
Electrical Characteristics—Mixed 3.3 V/5 V Operation ........ 9
Power Consumption .................................................................. 20
Package Characteristics ............................................................. 10
Insulation Lifetime ..................................................................... 20
Regulatory Information ............................................................. 11
Outline Dimensions ....................................................................... 22
Insulation and Safety Related Specifications .......................... 11
Ordering Guide .......................................................................... 22
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Insulation
Characteristics ............................................................................ 12
Recommended Operating Conditions .................................... 12
REVISION HISTORY
3/15—Rev. 0 to Rev. A
Changes to Features Section and Table 1 ...................................... 1
Changes to Supply Current Parameter, Table 3 ............................ 4
Changes to Supply Current Parameter, Table 5 ............................ 6
Changes to Supply Current Parameter, Table 7 ............................ 8
Changes to Supply Current Parameter, Table 9 and Table 10 ... 10
Changes to Table 11 ........................................................................ 11
Changes to Table 13 and Figure 2 ................................................. 12
Changes to High Speed Channels Section .................................. 17
Changes to Ordering Guide .......................................................... 22
7/14—Revision 0: Initial Version
Rev. A | Page 2 of 22
Data Sheet
ADuM3154
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—5 V OPERATION
All typical specifications are at TA = 25°C and VDD1 = VDD2 = 5 V. Minimum and maximum specifications apply over the entire
recommended operation range: 4.5 V ≤ VDD1 ≤ 5.5 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 2. Switching Specifications
Parameter
MCLK, MO, SO
SPI Clock Rate
Data Rate Fast (MO, SO)
Propagation Delay
Pulse Width
Pulse Width Distortion
Codirectional Channel Matching 1
Jitter, High Speed
MSS
Data Rate Fast
Propagation Delay
Pulse Width
Pulse Width Distortion
Setup Time 2
Jitter, High Speed
SSA0, SSA1
Data Rate Slow
Propagation Delay
Pulse Width
Jitter, Low Speed
SSAx 3 Minimum Input Skew 4
Symbol
SPIMCLK
DRFAST
tPHL, tPLH
PW
PWD
tPSKCD
JHS
DRFAST
tPHL, tPLH
PW
PWD
MSSSETUP
JHS
DRSLOW
tPHL, tPLH
PW
JLS
tSSAx SKEW3
Min
A Grade
Typ Max
Min
1
2
25
100
B Grade
Typ Max
12
12.5
2
2
2
2
1
1
21
2
26
100
21
1.5
3
10
1
1
250
2.6
0.1
4
2.5
40
34
26
12.5
3
0.1
4
17
34
14
250
2.6
2.5
40
Unit
MHz
Mbps
ns
ns
ns
ns
ns
Test Conditions/Comments
Within PWD limit
50% input to 50% output
Within PWD limit
|tPLH − tPHL|
Mbps
ns
ns
ns
ns
ns
Within PWD limit
50% input to 50% output
Within PWD limit
|tPLH − tPHL|
kbps
µs
µs
µs
ns
Within PWD limit
50% input to 50% output
Within PWD limit
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.
The MSS signal is glitch filtered in both speed grades, whereas the other fast signals are not glitch filtered in the B grade. To guarantee that MSS reaches the output
ahead of another fast signal, set up MSS prior to the competing signal by different times depending on speed grade.
3
SSAx = SSA1 or SSA2.
4
An internal asynchronous clock, not available to users, samples the low speed signals. If edge sequence in codirectional channels is critical to the end application, the
leading pulse must be at least 1 tSSAx SKEW ahead of a later pulse to guarantee the correct order or simultaneous arrival at the output.
1
2
Rev. A | Page 3 of 22
ADuM3154
Data Sheet
Table 3. For All Models 1, 2, 3
Parameter
SUPPLY CURRENT
A Grade and B Grade
B Grade
DC SPECIFICATIONS
MCLK, MSS, MO, SO, SSA0, SSA1
Input Threshold
Logic High
Logic Low
Input Hysteresis
Input Current per Channel
SCLK, MI, SI, SS0, SS1, SS2, SS3
Output Voltages
Logic High
Logic Low
VDD1, VDD2 Undervoltage Lockout
Supply Current for High Speed Channels
Dynamic Input
Dynamic Output
Supply Current for All Low Speed Channels
Quiescent Input
Quiescent Output
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity 4
Symbol
Min
Typ
Max
Unit
Test Conditions/Comments
IDD1
4.8
8.5
mA
IDD2
6.5
13
mA
IDD1
10
18
mA
IDD2
13.5
19
mA
CL = 0 pF, DRFAST = 1 MHz,
DRSLOW = 0 MHz
CL = 0 pF, DRFAST = 1 MHz,
DRSLOW = 0 MHz
CL = 0 pF, DRFAST = 17 MHz,
DRSLOW = 0 MHz
CL = 0 pF, DRFAST = 17 MHz,
DRSLOW = 0 MHz
VIH
VIL
VIHYST
II
0.7 × VDDx
VOH
VDDx − 0.1
VDDx − 0.4
+1
V
V
mV
µA
0.1
0.4
2.6
V
V
V
V
V
0.3 × VDDx
−1
VOL
500
+0.01
5.0
4.8
0.0
0.2
UVLO
IDDI(D)
IDDO(D)
0.080
0.046
mA/Mbps
mA/Mbps
IDD1(Q)
IDD2(Q)
4.2
6.1
mA
mA
2.5
35
ns
kV/µs
tR/tF
|CM|
25
0 V ≤ VINPUT ≤ VDDx
IOUTPUT = −20 µA, VINPUT = VIH
IOUTPUT = −4 mA, VINPUT = VIH
IOUTPUT = 20 µA, VINPUT = VIL
IOUTPUT = 4 mA, VINPUT = VIL
10% to 90%
VINPUT = VDDx, VCM = 1000 V,
transient magnitude = 800 V
VDDx = VDD1 or VDD2.
VINPUT is the input voltage of any of the MCLK, MSS, MO, SO, SSA0, or SSA1 pins.
3
IOUTPUT is the output current of any of the SCLK, MI, SI, SS0, SS1, SS2, or SS3 pins.
4
|CM| is the maximum common-mode voltage slew rate that can be sustained while maintaining output voltages within the VOH and VOL limits. The common-mode
voltage slew rates apply to both rising and falling common-mode voltage edges.
1
2
Rev. A | Page 4 of 22
Data Sheet
ADuM3154
ELECTRICAL CHARACTERISTICS—3.3 V OPERATION
All typical specifications are at TA = 25°C and VDD1 = VDD2 = 3.3 V. Minimum and maximum specifications apply over the entire
recommended operation range: 3.0 V ≤ VDD1 ≤ 3.6 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 4. Switching Specifications
Parameter
MCLK, MO, SO
SPI Clock Rate
Data Rate Fast (MO, SO)
Propagation Delay
Pulse Width
Pulse Width Distortion
Codirectional Channel Matching 1
Jitter, High Speed
MSS
Data Rate Fast
Propagation Delay
Pulse Width
Pulse Width Distortion
Setup Time 2
Jitter, High Speed
SSA0, SSA1
Data Rate Slow
Propagation Delay
Pulse Width
Jitter, Low Speed
SSAx 3 Minimum Input Skew 4
Symbol
SPIMCLK
DRFAST
tPHL, tPLH
PW
PWD
tPSKCD
JHS
DRFAST
tPHL, tPLH
PW
PWD
MSSSETUP
JHS
DRSLOW
tPHL, tPLH
PW
JLS
tSSAx SKEW3
Min
A Grade
Typ Max
Min
B Grade
Typ Max
1
2
30
100
12.5
34
21
12.5
3
3
2
2
1
1
2
34
100
34
34
12.5
3
1.5
3
10
1
0.1
4
1
250
2.6
0.1
4
2.5
40
250
2.6
2.5
40
Unit
MHz
Mbps
ns
ns
ns
ns
ns
Test Conditions/Comments
Within PWD limit
50% input to 50% output
Within PWD limit
|tPLH − tPHL|
Mbps
ns
ns
ns
ns
ns
Within PWD limit
50% input to 50% output
Within PWD limit
|tPLH − tPHL|
kbps
µs
µs
µs
ns
Within PWD limit
50% input to 50% output
Within PWD limit
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.
2
The MSS signal is glitch filtered in both speed grades, whereas the other fast signals are not glitch filtered in the B grade. To guarantee that MSS reaches the
output ahead of another fast signal, set up MSS prior to the competing signal by different times depending on speed grade.
3
SSAx = SSA1 or SSA2.
4
An internal asynchronous clock, not available to users, samples the low speed signals. If edge sequence in codirectional channels is critical to the end
application, the leading pulse must be at least 1 tSSAx SKEW ahead of a later pulse to guarantee the correct order or simultaneous arrival at the output.
1
Rev. A | Page 5 of 22
ADuM3154
Data Sheet
Table 5. For All Models 1, 2, 3
Parameter
SUPPLY CURRENT
A Grade and B Grade
B Grade
DC SPECIFICATIONS
MCLK, MSS, MO, SO, SSA0, SSA1
Input Threshold
Logic High
Logic Low
Input Hysteresis
Input Current per Channel
SCLK, MI, SI, SS0, SS1, SS2, SS3
Output Voltages
Logic High
Logic Low
VDD1, VDD2 Undervoltage Lockout
Supply Current for High Speed Channels
Dynamic Input
Dynamic Output
Supply Current for All Low Speed Channels
Quiescent Input
Quiescent Output
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity 4
Symbol
Min
Typ
Max
Unit
Test Conditions/Comments
IDD1
3.4
6.5
mA
IDD2
5
9
mA
IDD1
11.7
15
mA
IDD2
10
14
mA
CL = 0 pF, DRFAST = 1 MHz,
DRSLOW = 0 MHz
CL = 0 pF, DRFAST = 1 MHz,
DRSLOW = 0 MHz
CL = 0 pF, DRFAST = 17 MHz,
DRSLOW = 0 MHz
CL = 0 pF, DRFAST = 17 MHz,
DRSLOW = 0 MHz
VIH
VIL
VIHYST
II
0.7 × VDDx
VOH
VDDx − 0.1
VDDx − 0.4
0.3 × VDDx
−1
500
+0.01
+1
V
V
mV
µA
UVLO
5.0
4.8
0.0
0.2
2.6
IDDI(D)
IDDO(D)
0.078
0.026
mA/Mbps
mA/Mbps
IDD1(Q)
IDD2(Q)
2.9
4.7
mA
mA
2.5
35
ns
kV/µs
VOL
tR/tF
|CM|
25
0.1
0.4
V
V
V
V
V
0 V ≤ VINPUT ≤ VDDx
IOUTPUT = −20 µA, VINPUT = VIH
IOUTPUT = −4 mA, VINPUT = VIH
IOUTPUT = 20 µA, VINPUT = VIL
IOUTPUT = 4 mA, VINPUT = VIL
10% to 90%
VINPUT = VDDx, VCM = 1000 V,
transient magnitude = 800 V
VDDx = VDD1 or VDD2.
VINPUT is the input voltage of any of the MCLK, MSS, MO, SO, SSA0, or SSA1 pins.
3
IOUTPUT is the output current of any of the SCLK, MI, SI, SS0 SS1, SS2, or SS3 pins.
4
|CM| is the maximum common-mode voltage slew rate that can be sustained while maintaining output voltages within the VOH and VOL limits. The common-mode
voltage slew rates apply to both rising and falling common-mode voltage edges.
1
2
Rev. A | Page 6 of 22
Data Sheet
ADuM3154
ELECTRICAL CHARACTERISTICS—MIXED 5 V/3.3 V OPERATION
All typical specifications are at TA = 25°C and VDD1 = 5 V, VDD2 = 3.3 V. Minimum and 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 6. Switching Specifications
Parameter
MCLK, MO, SO
SPI Clock Rate
Data Rate Fast (MO, SO)
Propagation Delay
Pulse Width
Pulse Width Distortion
Codirectional Channel Matching 1
Jitter, High Speed
MSS
Data Rate Fast
Propagation Delay
Pulse Width
Pulse Width Distortion
Setup Time 2
Jitter, High Speed
SSA0, SSA1
Data Rate Slow
Propagation Delay
Pulse Width
Jitter, Low Speed
SSAx 3 Minimum Input Skew 4
Symbol
SPIMCLK
DRFAST
tPHL, tPLH
PW
PWD
tPSKCD
JHS
DRFAST
tPHL, tPLH
PW
PWD
MSSSETUP
JHS
DRSLOW
tPHL, tPLH
PW
JLS
tSSAx SKEW3
Min
A Grade
Typ Max
Min
B Grade
Typ Max
1
2
27
25
15.6
34
17
12.5
2
2
2
2
1
1
2
30
25
34
30
12.5
2
1.5
2
10
1
0.1
4
1
250
2.6
0.1
4
2.5
40
250
2.6
2.5
40
Unit
MHz
Mbps
ns
ns
ns
ns
ns
Test Conditions/Comments
Within PWD limit
50% input to 50% output
Within PWD limit
|tPLH − tPHL|
Mbps
ns
ns
ns
ns
ns
Within PWD limit
50% input to 50% output
Within PWD limit
|tPLH − tPHL|
kbps
µs
µs
µs
ns
Within PWD limit
50% input to 50% output
Within PWD limit
|tPLH − tPHL|
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.
2
The MSS signal is glitch filtered in both speed grades, whereas the other fast signals are not glitch filtered in the B grade. To guarantee that MSS reaches the output
ahead of another fast signal, set up MSS prior to the competing signal by different times depending on speed grade.
3
SSAx = SSA1 or SSA2.
4
An internal asynchronous clock, not available to users, samples the low speed signals. If edge sequence in codirectional channels is critical to the end application, the
leading pulse must be at least 1 tSSAx SKEW ahead of a later pulse to guarantee the correct order or simultaneous arrival at the output.
1
Rev. A | Page 7 of 22
ADuM3154
Data Sheet
Table 7. For All Models 1, 2, 3
Parameter
SUPPLY CURRENT
A Grade and B Grade
B Grade
DC SPECIFICATIONS
MCLK, MSS, MO, SO, SSA0, SSA1
Input Threshold
Logic High
Logic Low
Input Hysteresis
Input Current per Channel
SCLK, MI, SI, SS0, SS1, SS2, SS3
Output Voltages
Logic High
Logic Low
VDD1, VDD2 Undervoltage Lockout
Supply Current for All Low Speed Channels
Quiescent Input
Quiescent Output
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity 4
Symbol
Min
Typ
Max
Unit
Test Conditions/Comments
IDD1
4.8
8.5
mA
IDD2
5
9
mA
IDD1
10
18
mA
IDD2
10
14
mA
CL = 0 pF, DRFAST = 1 MHz,
DRSLOW = 0 MHz
CL = 0 pF, DRFAST = 1 MHz,
DRSLOW = 0 MHz
CL = 0 pF, DRFAST = 17 MHz,
DRSLOW = 0 MHz
CL = 0 pF, DRFAST = 17 MHz,
DRSLOW = 0 MHz
VIH
VIL
VIHYST
II
0.7 × VDDx
VOH
VDDx − 0.1
VDDx − 0.4
0.3 × VDDx
−1
500
+0.01
+1
V
V
mV
µA
UVLO
5.0
4.8
0.0
0.2
2.6
IDD1(Q)
IDD2(Q)
4.2
4.7
mA
mA
2.5
35
ns
kV/µs
VOL
tR/tF
|CM|
25
0.1
0.4
V
V
V
V
V
0 V ≤ VINPUT ≤ VDDX
IOUTPUT = −20 µA, VINPUT = VIH
IOUTPUT = −4 mA, VINPUT = VIH
IOUTPUT = 20 µA, VINPUT = VIL
IOUTPUT = 4 mA, VINPUT = VIL
10% to 90%
VINPUT = VDDx, VCM = 1000 V,
transient magnitude = 800 V
VDDx = VDD1 or VDD2.
VINPUT is the input voltage of any of the MCLK, MSS, MO, SO, SSA0, or SSA1 pins.
3
IOUTPUT is the output current of any of the SCLK, MI, SI, SS0, SS1, SS2, or SS3 pins.
4
|CM| is the maximum common-mode voltage slew rate that can be sustained while maintaining output voltages within the VOH and VOL limits. The common-mode
voltage slew rates apply to both rising and falling common-mode voltage edges.
1
2
Rev. A | Page 8 of 22
Data Sheet
ADuM3154
ELECTRICAL CHARACTERISTICS—MIXED 3.3 V/5 V OPERATION
All typical specifications are at TA = 25°C and VDD1 = 3.3 V, VDD2 = 5 V. Minimum and 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 8. Switching Specifications
Parameter
MCLK, MO, SO
SPI Clock Rate
Data Rate Fast (MO, SO)
Propagation Delay
Pulse Width
Pulse Width Distortion
Codirectional Channel Matching 1
Jitter, High Speed
MSS
Jitter
Data Rate Fast
Propagation Delay
Pulse Width
Pulse Width Distortion
Setup Time 2
Jitter, High Speed
SSA0, SSA1
Data Rate Slow
Propagation Delay
Pulse Width
Jitter, Low Speed
SSAx 3 Minimum Input Skew 4
Symbol
SPIMCLK
DRFAST
tPHL, tPLH
PW
PWD
tPSKCD
JHS
Min
A Grade
Typ Max
Min
1
2
28
100
15.6
34
17
12.5
2
2
2
2
1
1
1
DRFAST
tPHL, tPLH
PW
PWD
MSSSETUP
JHS
DRSLOW
tPHL, tPLH
PW
JLS
tSSAx SKEW3
B Grade
Typ Max
1
2
28
100
21
12.5
2
1.5
2
10
1
0.1
4
1
250
2.6
0.1
4
2.5
40
34
28
250
2.6
2.5
40
Unit
MHz
Mbps
ns
ns
ns
ns
ns
ns
Mbps
ns
ns
ns
ns
ns
kbps
µs
µs
µs
ns
Test Conditions/Comments
Within PWD limit
50% input to 50% output
Within PWD limit
|tPLH − tPHL|
Within PWD limit
50% input to 50% output
Within PWD limit
|tPLH − tPHL|
Within PWD limit
50% input to 50% output
Within PWD limit
|tPLH − tPHL|
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.
The MSS signal is glitch filtered in both speed grades, whereas the other fast signals are not glitch filtered in the B grade. To guarantee that MSS reaches the output
ahead of another fast signal, set up MSS prior to the competing signal by different times depending on speed grade.
3
SSAx = SSA1 or SSA2.
4
An internal asynchronous clock, not available to users, samples the low speed signals. If edge sequence in codirectional channels is critical to the end application, the
leading pulse must be at least 1 tSSAx SKEW ahead of a later pulse to guarantee the correct order or simultaneous arrival at the output.
1
2
Rev. A | Page 9 of 22
ADuM3154
Data Sheet
Table 9. For All Models 1, 2, 3
Parameter
SUPPLY CURRENT
A Grade and B Grade
Symbol
B Grade
DC SPECIFICATIONS
MCLK, MSS, MO, SO, SSA0, SSA1
Input Threshold
Logic High
Logic Low
Input Hysteresis
Input Current per Channel
SCLK, MI, SI, SS0, SS1, SS2, SS3
Output Voltages
Logic High
Logic Low
Min
Typ
Max
Unit
Test Conditions/Comments
IDD
3.4
6.5
mA
IDD2
6.5
13
mA
IDD
11.7
15
mA
IDD2
13.5
19
mA
CL = 0 pF, DRFAST = 1 MHz,
DRSLOW = 0 MHz
CL = 0 pF, DRFAST = 1 MHz,
DRSLOW = 0 MHz
CL = 0 pF, DRFAST = 17 MHz,
DRSLOW = 0 MHz
CL = 0 pF, DRFAST = 17 MHz,
DRSLOW = 0 MHz
VIH
VIL
VIHYST
II
0.7 × VDDx
VOH
VDDx − 0.1
VDDx − 0.4
0.3 × VDDx
500
+0.01
−1
UVLO
5.0
4.8
0.0
0.2
2.6
IDD1Q)
IDD2(Q)
2.9
6.1
mA
mA
2.5
35
ns
kV/µs
VOL
VDD1, VDD2 Undervoltage Lockout
Supply Current for All Low Speed Channels
Quiescent Input
Quiescent Output
AC SPECIFICATIONS
Output Rise/Fall Time
Common-Mode Transient Immunity 4
+1
V
V
mV
µA
tR/tF
|CM|
25
0.1
0.4
V
V
V
V
V
0 V ≤ VINPUT ≤ VDDx
IOUTPUT = −20 µA, VINPUT = VIH
IOUTPUT = −4 mA, VINPUT = VIH
IOUTPUT = 20 µA, VINPUT = VIL
IOUTPUT = 4 mA, VINPUT = VIL
10% to 90%
VINPUT = VDDx, VCM = 1000 V,
transient magnitude = 800 V
VDDx = VDD1 or VDD2.
VINPUT is the input voltage of any of the MCLK, MSS, MO, SO, SSA0, or SSA1 pins.
3
IOUTPUT is the output current of any of the SCLK, MI, SI, SS0, SS1, SS2, or SS3 pins.
4
|CM| is the maximum common-mode voltage slew rate that can be sustained whereas maintaining output voltages within the VOH and VOL limits. The common-mode
voltage slew rates apply to both rising and falling common-mode voltage edges.
1
2
PACKAGE CHARACTERISTICS
Table 10.
Parameter
Resistance (Input to Output) 1
Capacitance (Input to Output)1
Input Capacitance 2
IC Junction to Case Thermal Resistance
1
2
Symbol
RI-O
CI-O
CI
θJC
Min
Typ
1012
1.0
4.0
68.5
Max
Unit
Ω
pF
pF
°C/W
Test Conditions/Comments
f = 1 MHz
4-layer JEDEC test board, JESD 51-7 specification
The device is considered a 2-terminal device: Pin 1 through Pin 10 are shorted together, and Pin 11 through Pin 20 are shorted together.
Input capacitance is from any input data pin to ground.
Rev. A | Page 10 of 22
Data Sheet
ADuM3154
REGULATORY INFORMATION
The ADuM3154 is approved by the organizations listed in Table 11. See Table 16 and the Insulation Lifetime section for recommended
maximum working voltages for specific cross isolation waveforms and insulation levels.
Table 11.
UL
Recognized under 1577 Component
Recognition Program 1
3750 V rms Single Protection
File E214100
CSA
Approved under CSA Component
Acceptance Notice #5A
Basic insulation per CSA 60950-1-07+A1+A2
and IEC 60950-1 2nd Ed.+A1+A2, 510 V rms
(721 V peak) maximum working voltage 3
File 205078
VDE
Certified according to DIN V VDE V 0884-10
(VDE V 0884-10):2006-12 2
Reinforced insulation, 565 V peak
File 2471900-4880-0001
In accordance with UL 1577, each ADuM3154 is proof tested by applying an insulation test voltage ≥4500 V rms for 1 second (current leakage detection limit = 10 µA).
In accordance with DIN V VDE V 0884-10, each ADuM3154 is proof tested by applying an insulation test voltage ≥525 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.
3
See Table 16 for recommended maximum working voltages under various operating conditions.
1
2
INSULATION AND SAFETY RELATED SPECIFICATIONS
Table 12.
Parameter
Rated Dielectric Insulation Voltage
Minimum External Air Gap (Clearance)
Symbol
L(I01)
Value
3750
5.1
Unit
V rms
mm min
Minimum External Tracking (Creepage)
L(I02)
5.1
mm min
Minimum Internal Gap (Internal Clearance)
Tracking Resistance (Comparative Tracking Index)
Material Group
CTI
0.017
>400
II
mm min
V
Rev. A | Page 11 of 22
Test Conditions/Comments
1 minute duration
Measured from input terminals to output terminals,
shortest distance through air
Measured from input terminals to output terminals,
shortest distance path along body
Distance through insulation
DIN IEC 112/VDE 0303 Part 1
Material group (DIN VDE 0110, 1/89, Table 1)
ADuM3154
Data Sheet
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 INSULATION CHARACTERISTICS
This isolator is suitable for reinforced electrical isolation only within the safety limit data. Maintenance of the safety data is ensured by
protective circuits. The asterisk (*) marked on packages denotes DIN V VDE V 0884-10 approval.
Table 13.
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
Input-to-Output Test Voltage, Method a
After Environmental Tests Subgroup 1
After Input and/or Safety Test Subgroup 2
and Subgroup 3
Highest Allowable Overvoltage
Surge Isolation Voltage
Safety Limiting Values
Case Temperature
Safety Total Dissipated Power
Insulation Resistance at TS
Test Conditions/Comments
VIORM × 1.875 = Vpd(m), 100% production test,
tini = tm = 1 sec, partial discharge < 5 pC
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
VIOSM(TEST) = 10 kV, 1.2 µs rise time, 50 µs,
50% fall time
Maximum value allowed in the event of a failure
(see Figure 2)
VIO = 500 V
Symbol
Characteristic
Unit
VIORM
Vpd(m)
I to IV
I to III
I to II
40/105/21
2
565
1059
V peak
V peak
Vpd(m)
848
V peak
Vpd(m)
678
V peak
VIOTM
VIOSM
5000
6250
V peak
V peak
TS
IS1
RS
150
1.4
>109
°C
W
Ω
RECOMMENDED OPERATING CONDITIONS
2.0
SAFE LIMITING POWER (W)
1.8
Table 14.
1.6
Parameter
Operating Temperature Range
Supply Voltage Range 1
1.4
1.2
1.0
0.8
Input Signal Rise and Fall Times
0.6
1
0.2
0
0
50
100
150
AMBIENT TEMPERATURE (°C)
Min
−40
3.0
Max
+125
5.5
Unit
°C
V
1.0
ms
See the DC Correctness and Magnetic Field Immunity section for information
on the immunity to the external magnetic fields.
12369-002
0.4
Symbol
TA
VDD1,
VDD2
200
Figure 2. Thermal Derating Curve, Dependence of Safety Limiting Values
with Case Temperature per DIN V VDE V 0884-10
Rev. A | Page 12 of 22
Data Sheet
ADuM3154
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted
Table 16. Maximum Continuous Working Voltage1
Table 15.
Parameter
AC 60 Hz
RMS Voltage
Max
400
Unit
V rms
DC Voltage
722
V peak
Parameter
Storage Temperature (TST) Range
Ambient Operating Temperature
(TA) Range
Supply Voltages (VDD1, VDD2)
Input Voltages (MCLK, MSS, MO, SO,
SSA0, SSA1)
Output Voltages (SCLK, MI, SI, SS0
SS1, SS2, SS3)
Average Output Current per Pin1
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 VDDx + 0.5 V
1
2
−0.5 V to VDDx + 0.5 V
3
−10 mA to +10 mA
−100 kV/µs to +100 kV/µs
See Figure 2 for maximum safety rated current values across temperature.
Refers to common-mode transients across the insulation barrier. Commonmode transients exceeding the absolute maximum ratings may cause
latch-up or permanent damage.
Constraint
20-year lifetime at 0.1%
failure rate, zero average
voltage
Limited by the creepage of
the package, Pollution
Degree 2, Material Group II2, 3
See the Insulation Lifetime section for details.
Other pollution degree and material group requirements yield a different limit.
Some system level standards allow components to use the printed wiring
board (PWB) creepage values. The supported dc voltage may be higher for
those standards.
ESD CAUTION
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.
Rev. A | Page 13 of 22
ADuM3154
Data Sheet
VDD1
1
20
VDD2
GND1
2
19
GND2
MCLK
3
18
SCLK
MO
4
17
SI
MI
ADuM3154
5
16
SO
MSS
6
TOP VIEW
(Not to Scale)
SSA0
7
15
SS0
14
SS1
SSA1
8
13
SS2
NIC
9
12
GND1 10
11
SS3
GND2
NOTES
1. NIC = NOT INTERNALLY CONNECTED.
THIS PIN IS NOT INTERNALLY
CONNECTED AND SERVES NO
FUNCTION IN THE ADuM3154.
12369-003
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Figure 3. Pin Configuration
Table 17. Pin Function Descriptions
Pin No.
1
2, 10
3
4
5
6
Mnemonic
VDD1
GND1
MCLK
MO
MI
MSS
Direction
Power
Return
Input
Input
Output
Input
7
8
9
11, 19
12
13
14
15
16
17
18
20
SSA0
SSA1
NIC
GND2
SS3
SS2
SS1
SS0
SO
SI
SCLK
VDD2
Input
Input
Return
Output
Output
Output
Output
Input
Output
Output
Power
Description
Input Power Supply for Side 1. A bypass capacitor from VDD1 to GND1 to local ground is required.
Ground 1. Ground reference for Isolator Side 1.
SPI Clock from the Master Controller.
SPI Data from the Master to the Slave MO/SI Line.
SPI Data from the Slave to the Master MI/SO Line.
Slave Select from the Master. This signal uses an active low logic. The slave select pin can require as
much as a 10 ns setup time from the next clock or data edge depending on the speed grade.
Multiplexer Selection Input, Low Order Bit.
Multiplexer Selection Input, High Order Bit.
Not Internally Connected. This pin is not internally connected and serves no function in the ADuM3154.
Ground 2. Ground reference for Isolator Side 2.
Routed Slave Select Signal. High-Z when SS3 is not selected.
Routed Slave Select Signal. High-Z when SS2 is not selected.
Routed Slave Select Signal. High-Z when SS1 is not selected.
Routed Slave Select Signal. High-Z when SS0 is not selected.
SPI Data from the Slave to the Master MI/SO Line.
SPI Data from the Master to the Slave MO/SI Line.
SPI Clock from the Master Controller.
Input Power Supply for Side 2. A bypass capacitor from VDD2 to GND2 to local ground is required.
Rev. A | Page 14 of 22
Data Sheet
ADuM3154
Table 18. Multiplexer Select Truth Table 1
Master Mux Inputs
MSS
1
0
1
0
1
0
1
0
1
SSA0
0
0
1
1
0
0
1
1
Slave Mux Outputs
SSA1
0
0
0
0
1
1
1
1
SS0
1
0
Z
Z
Z
Z
Z
Z
SS1
Z
Z
1
0
Z
Z
Z
Z
SS2
Z
Z
Z
Z
1
0
Z
Z
SS3
Z
Z
Z
Z
Z
Z
1
0
Z = high impedance.
Table 19. Power Off Default State Truth Table (Positive Logic) 1, 2
Power State
VDD1
Unpowered 3
Powered
Powered
Powered
Master Side
Output
MI
Z
Z
1
0
Inputs
MCLK
X
X
1
0
MO
X
X
1
0
Power State
VDD2
Powered
Unpowered3
Powered
Powered
Z = high impedance.
X = irrelevant.
3
Outputs on an unpowered side are high impedance within one diode drop of ground.
1
2
Rev. A | Page 15 of 22
Slave Side
Input
SO
X
X
1
0
Outputs
SCLK
Z
Z
1
0
SI
Z
Z
1
0
ADuM3154
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
4.0
7
3.5
DYNAMIC SUPPLY CURRENT
PER OUTPUT CHANNEL (mA)
5
5.0V
3.3V
4
3
2
1
5.0V
2.5
2.0
3.3V
1.5
1.0
20
40
DATA RATE (Mbps)
60
80
0
12369-004
0
Figure 4. Typical Dynamic Supply Current per Input Channel vs. Data Rate for
5.0 V and 3.3 V Operation
0
80
60
40
DATA RATE (Mbps)
Figure 7. Typical Dynamic Supply Current per Output Channel vs. Data Rate
for 5.0 V and 3.3 V Operation
30
25
IDD2 SUPPLY CURRENT (mA)
25
20
5.0V
3.3V
15
10
5
0
20
40
DATA RATE (Mbps)
60
80
20
5.0V
15
3.3V
10
5
0
12369-006
0
0
20
60
80
25
16
3.3V
14
20
PROPAGATION DELAY (ns)
3.3V
12
10
40
DATA RATE (Mbps)
Figure 8. Typical IDD2 Supply Current vs. Data Rate for
5.0 V and 3.3 V Operation
Figure 5. Typical IDD1 Supply Current vs. Data Rate for
5.0 V and 3.3 V Operation
PROPAGATION DELAY (ns)
20
12369-005
0.5
0
IDD1 SUPPLY CURRENT (mA)
3.0
12369-007
DYNAMIC SUPPLY CURRENT
PER INPUT CHANNEL (mA)
6
5.0V
8
6
4
5.0V
15
10
5
10
60
AMBIENT TEMPERATURE (°C)
110
0
–40
12369-008
0
–40
10
60
AMBIENT TEMPERATURE (°C)
Figure 6. Typical Propagation Delay vs. Ambient Temperature for High Speed
Channels Without Glitch Filter (See the High Speed Channels Section)
110
12369-009
2
Figure 9. Typical Propagation Delay vs. Ambient Temperature for High Speed
Channels with Glitch Filter (See the High Speed Channels Section)
Rev. A | Page 16 of 22
Data Sheet
ADuM3154
APPLICATIONS INFORMATION
INTRODUCTION
The ADuM3154 was created to optimize isolation of the SPI for
speed and provide additional low speed channels for control
and status monitoring functions. The isolator is based on
differential signaling iCoupler technology for enhanced speed
and noise immunity.
High Speed Channels
The ADuM3154 has four high speed channels. The first three
channels, CLK, MI/SO, and MO/SI (the slash indicates the
connection of the particular input and output channel across
the isolator), are optimized for either low propagation delay in
the B grade, or high noise immunity in the A grade. The
difference between the grades is the addition of a glitch filter to
these three channels in the A grade version, which increases the
propagation delay. The B grade version, with a maximum
propagation delay of 14 ns, supports a maximum clock rate of
17 MHz in standard 4-wire SPI. However, because the glitch
filter is not present in the B grade version, ensure that spurious
glitches of less than 10 ns are not present.
The SS (slave select bar) is typically an active low signal. It can
have many different functions in SPI and SPI like busses. Many
of these functions are edge triggered, so the SS path contains a
glitch filter in both the A grade and the B grade. The glitch filter
prevents short pulses from propagating to the output or causing
other errors in operation. The MSS signal requires a 10 ns setup
time in the B grade devices prior to the first active clock edge to
allow the added propagation time of the glitch filter.
Slave Select Multiplexer
The ADuM3154 can control up to four independent slave
devices. Figure 10 shows how this can be done using generalpurpose isolators. An isolation channel is required for each
slave select; therefore, seven high speed channels are required to
transfer bidirectional data to four slaves.
Glitches of less than 10 ns in the B grade devices can cause the
second edge of the glitch to be missed. This pulse condition is
then seen as a spurious data transition on the output that is
corrected by a refresh or the next valid data edge. It is recommended
to use the A grade devices in noisy environments.
The relationship between the SPI signal paths and the pin
mnemonics of the ADuM3154 and data directions is detailed in
Table 20.
Table 20. Pin Mnemonics Correspondence to SPI Signal Path
Names
Master
Side 1
MCLK
MO
MI
MSS
Data
Direction
→
→
←
→
Slave
Side 2
SCLK
SI
SO
SSx
ISOLATOR
CLK
MOSI
MISO
SS0
SS1
CLK
SLAVE 0
MOSI
MISO
SS0
CLK
SS2
MOSI
SS3
MISO
SLAVE 1
SS1
CLK
SLAVE 2
MOSI
MISO
SS2
CLK
SLAVE 3
MOSI
MISO
The datapaths are SPI mode agnostic. The CLK and MOSI SPI
datapaths are optimized for propagation delay and channel to
channel matching. The MISO SPI datapath is optimized for
propagation delay. The device does not synchronize to the clock
channel; therefore, there are no constraints on the clock polarity
or the timing with respect to the data line. To allow
compatibility with nonstandard SPI interfaces, the MI pin is
always active, and does not tristate when the slave select is not
asserted. This precludes tying several MI lines together without
adding a trisate buffer or multiplexor.
Rev. A | Page 17 of 22
SS3
Figure 10. Multiple Slave Control with Standard Isolators
12369-010
SPI Signal
Path
CLK
MO/SI
MI/SO
SS
MASTER
ADuM3154
Data Sheet
Figure 12 illustrates the behavior of the SSA0 and SSA1
channels. This diagram assumes that MSS is low and that SS0,
SS1, SS2, and SS3 are pulled up.
Figure 11 shows how the ADuM3154 can control up to four
slaves by routing the MSS input to one of four outputs on the
slave side of the isolator, which eliminates three isolation
channels compared to the standard solution.
SAMPLE CLOCK
ADuM3154
MASTER
CLK
CLK
MOSI
MISO
SSA1
MISO
MSS
A
B
A
C
SS0
SSA0
SSA1
SLAVE 0
SSA0
MOSI
CLK
MUX
SLAVE 1
SS0
C
MOSI
SS1
MISO
A
SS2
SS1
SS3
SLAVE 2
MOSI
OUTPUT CLOCK
Figure 12. Mux Select Timing
MISO
The following details the mux select timing shown in Figure 12:
SS2
CLK
•
SLAVE 3
MOSI
12369-011
MISO
SS3
12369-012
CLK
B
Figure 11. Multiple Slave Control
The multiplexer select lines are low speed channels implemented as
part of the dc correctness scheme in the ADuM3154. The dc
value of all high and low speed inputs on a given side of the
device are sampled simultaneously, packetized, and shifted
across an isolation coil. The high speed channels are compared
for dc accuracy, and the low speed mux select lines, SSA0 and
SSA1, are transferred to the mux control block. The dc
correctness data for the high speed channels is handled
internally with no visibility off chip.
•
•
This data is regulated by a free running internal clock. Because data
is sampled at discrete times based on this clock, the propagation
delay for mux select lines is between 100 ns and 2.6 µs depending
on where the input data edge changes with respect to the internal
sample clock. After an address propagation delay time of up to
2.6 µs, the multiplexer routes the MSS signals to the desired output.
The outputs that are not selected are set to high-Z, and the
application pulls them to the desired idle state.
Rev. A | Page 18 of 22
Point A: The mux select lines must be switched
simultaneously to within the tSSAx SKEW time. Failure to do
this may allow sampling the inputs between the edges and
selecting an incorrect mux output. Point A on SS1 is a
metastable state on the output mux resulting from wide
spacing between SSA0 and SSA1.
Point B: For mux select lines to be processed predictably, a
state of SSA0 and SSA1 must be stable for longer than 4 µs
before switching the mux to another output. This
guarantees that at least two samples are taken of the inputs
before the mux output is changed.
Point C: This point in Figure 12 shows a clean transfer
between SS3 being active and SS0 being active. The mux
was designed to eliminate any short duration metastable
states between any two selected outputs.
Data Sheet
ADuM3154
PRINTED CIRCUIT BOARD (PCB) LAYOUT
The ADuM3154 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 13). The capacitor value must 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 must not
exceed 20 mm.
BYPASS < 2mm
VDD2
GND2
MO
TOP VIEW
(Not to Scale)
MI
If the low speed decoder receives no pulses for more than about
5 µs, the input side is assumed to be unpowered or nonfunctional,
in which case, the isolator output is forced to a high-Z state by
the watchdog timer circuit.
SCLK
SI
SO
MSS
SS0
SSA0
SS1
SSA1
SS2
NIC
SS3
GND2
GND1
Figure 13. Recommended PCB Layout
In applications involving high common-mode transients, it is
important to minimize board coupling across the isolation barrier.
Furthermore, design the board layout so that any coupling that
does occur affects all pins equally on a given component side.
Failure to ensure this can cause voltage differentials between
pins exceeding the absolute maximum ratings of the device,
thereby leading to latch-up or permanent damage.
PROPAGATION DELAY RELATED PARAMETERS
Propagation delay is a parameter that describes the time it takes
a logic signal to propagate through a component. The input to
output propagation delay time for a high to low transition may
differ from the propagation delay time of a low to high
transition.
INPUT
50%
OUTPUT
tPHL
12369-014
tPLH
50%
Figure 14. 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
ADuM3154 component.
The limitation on the magnetic field immunity of the device 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
ADuM3154 is examined in a 3 V operating condition because it
represents the most susceptible mode of operation for 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;
thereby 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)Σπrn2; 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 ADuM3154 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 15.
100
10
1
0.1
0.01
0.001
1k
10k
100k
1M
10M
MAGNETIC FIELD FREQUENCY (Hz)
100M
Figure 15. Maximum Allowable External Magnetic Flux Density
Rev. A | Page 19 of 22
12369-015
ADuM3154
12369-013
MCLK
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 ~1.2 µs, a
periodic set of refresh pulses indicative of the correct input state
are sent via the low speed channel to ensure dc correctness at
the output.
MAXIMUM ALLOWABLE MAGNETIC FLUX
DENSITY (kgauss)
VDD1
GND1
DC CORRECTNESS AND MAGNETIC FIELD
IMMUNITY
ADuM3154
Data Sheet
For example, at a magnetic field frequency of 1 MHz, the
maximum allowable magnetic field of 0.5 kgauss induces a
voltage of 0.25 V at the receiving coil. This 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 reduces the received pulse from >1.0 V to
0.75 V, which is still well above the 0.5 V sensing threshold of
the decoder.
These quiescent currents add to the high speed current as is
shown in the following equations for the total current for each
side of the isolator. Dynamic currents are taken from Table 3
and Table 5 for the respective voltages.
The preceding magnetic flux density values correspond to
specific current magnitudes at given distances away from the
ADuM3154 transformers. Figure 16 expresses these allowable
current magnitudes as a function of frequency for selected
distances. The ADuM3154 is insensitive to external fields. Only
extremely large, high frequency currents very close to the
component are potentially a concern. For the 1 MHz example
noted, a user would have to place a 1.2 kA current 5 mm away
from the ADuM3154 to affect component operation.
For Side 2, the supply current is given by
DISTANCE = 1m
100
10
DISTANCE = 100mm
1
DISTANCE = 5mm
0.1
0.01
1k
10k
100k
1M
10M
MAGNETIC FIELD FREQUENCY (Hz)
100M
12369-016
MAXIMUM ALLOWABLE CURRENT (kA)
1000
Figure 16. Maximum Allowable Current for
Various Current to ADuM3154 Spacings
At combinations of a strong magnetic field and high frequency,
any loops formed by the PCB traces may 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 ADuM3154
isolator is a function of the supply voltage, the data rate of the
channel, the output load of the channel, and whether it is a high
or low speed channel.
The low speed channels draw a constant quiescent current
caused by the internal ping-pong datapath. The operating
frequency is low enough that the capacitive losses caused by
the recommended capacitive load are negligible compared to
the quiescent current. The explicit calculation for the data rate
is eliminated for simplicity, and the quiescent current for each
side of the isolator due to the low speed channels can be found
in Table 3, Table 5, Table 7, and Table 9 for the particular operating
voltages.
For Side 1, the supply current is given by
(
+ ((0.5 × 10 ) × C
)
I DD1 = I DDI(D) × f MCLK + f MO + f MSS +
(
f MI × I DDO(D)
−3
I DD 2 = I DDI(D) × f SO +
(
(
L(MI)
))
× VDD1 + I DD1(Q)
))
f SCLK × I DDO(D) + (0.5 × 10 −3 ) × C L(SCLK) × VDD 2 +
(
(
f SI × I DDO(D) + (0.5 × 10
(
−3
(
f SSx × I DDO(D) + (0.5 × 10
)× CL(SI) × VDD2 )) +
)× CL(SSx) × VDD2 )) + I DD2(Q)
−3
where:
IDDI(D), IDDO(D) are the input and output dynamic supply currents
per channel (mA/Mbps).
fX is the logic signal data rate for the specified channel (Mbps).
CL(x) is the load capacitance of the specified output (pF).
VDDx is the supply voltage of the side being evaluated (V).
IDD1(Q), IDD2(Q) are the specified Side 1 and Side 2 quiescent
supply currents (mA).
Figure 4 and Figure 7 show the supply current per channel as a
function of data rate for an input and unloaded output. Figure 5
and Figure 8 show the total IDD1 and IDD2 supply currents as a
function of data rate for ADuM3154 channel configurations with
all high speed channels running at the same speed and the low
speed channels at idle.
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, as well as the
materials and material interfaces.
Two types of insulation degradation are of primary interest:
breakdown along surfaces exposed to the air and insulation
wear out. Surface breakdown is the phenomenon of surface
tracking and the primary determinant of surface creepage
requirements in system level standards. Insulation wear out is
the phenomenon where charge injection or displacement
currents inside the insulation material cause long-term
insulation degradation.
Rev. A | Page 20 of 22
Data Sheet
ADuM3154
Calculation and Use of Parameters Example
Surface tracking is addressed in electrical safety standards by
setting a minimum surface creepage based on the working
voltage, the environmental conditions, and the properties of the
insulation material. Safety agencies perform characterization
testing on the surface insulation of components that allow the
components to be categorized in different material groups.
Lower material group ratings are more resistant to surface
tracking and, therefore, can provide adequate lifetime with
smaller creepage. The minimum creepage for a given working
voltage and material group is in each system level standard and
is based on the total rms voltage across the isolation, pollution
degree, and material group. The material group and creepage
for the ADuM3154 isolator are detailed in Table 12.
The following is an example that frequently arises in power
conversion applications. Assume that the line voltage on one
side of the isolation is 240 VAC RMS, and a 400 VDC bus voltage is
present on the other side of the isolation barrier. The isolator
material is polyimide. To establish the critical voltages in
determining the creepage clearance and lifetime of a device,
see Figure 17 and the following equations.
The lifetime of insulation caused by wear out is determined by
its thickness, the material properties, and the voltage stress
applied. It is important to verify that the product lifetime is
adequate at the application working voltage. The working
voltage supported by an isolator for wear out may not be the
same as the working voltage supported for tracking. It is the
working voltage applicable to tracking that is specified in most
standards.
Testing and modeling have shown that the primary driver of
long-term degradation is displacement current in the polyimide
insulation causing incremental damage. The stress on the
insulation can be broken down into two broad categories, such
as dc stress, which causes very little wear out because there is no
displacement current, and an ac component time varying
voltage stress, which causes wear out.
The ratings in certification documents are usually based on
60 Hz sinusoidal stress, because this reflects isolation from line
voltage. However, many practical applications have
combinations of 60 Hz ac and dc across the barrier, as shown in
Equation 1. Because only the ac portion of the stress causes
wear out, the equation can be rearranged to solve for the ac rms
voltage, as shown in Equation 2. For insulation wear out with
the polyimide materials used in this product, the ac rms voltage
determines the product lifetime.
VRMS = VAC RMS2 + VDC 2
(1)
VAC RMS = VRMS 2 − VDC 2
(2)
or
where:
VRMS is the total rms working voltage.
VAC RMS is the time varying portion of the working voltage.
VDC is the dc offset of the working voltage.
VAC RMS
VPEAK
VRMS
VDC
TIME
Figure 17. Critical Voltage Example
The working voltage across the barrier from Equation 1 is
VRMS = VAC RMS2 + VDC 2
VRMS = 2402 + 4002
VRMS = 466 V
This is the working voltage used together with the material
group and pollution degree when looking up the creepage
required by a system standard.
To determine if the lifetime is adequate, obtain the time varying
portion of the working voltage. The ac rms voltage can be
obtained from Equation 2.
VAC RMS = VRMS 2 − VDC 2
VAC RMS = 4662 − 4002
VAC RMS = 240 VRMS
In this case, the VAC RMS is simply the line voltage of 240 VRMS.
This calculation is more relevant when the waveform is not
sinusoidal. The value is compared to the limits for the working
voltage listed in Table 16 for the expected lifetime, under a
60 Hz sine wave, and it is well within the limit for a 50-year
service life.
Note that the dc working voltage limit in Table 16 is set by the
creepage of the package as specified in IEC 60664-1. This value
may differ for specific system level standards.
Rev. A | Page 21 of 22
12369-017
Insulation Wear Out
ISOLATION VOLTAGE
Surface Tracking
ADuM3154
Data Sheet
OUTLINE DIMENSIONS
7.50
7.20
6.90
11
20
5.60
5.30
5.00
1
8.20
7.80
7.40
10
0.65 BSC
SEATING
PLANE
8°
4°
0°
0.95
0.75
0.55
COMPLIANT TO JEDEC STANDARDS MO-150-AE
060106-A
0.38
0.22
0.05 MIN
COPLANARITY
0.10
0.25
0.09
1.85
1.75
1.65
2.00 MAX
Figure 18. 20-Lead Shrink Small Outline Package [SSOP]
(RS-20)
Dimensions shown in millimeters
ORDERING GUIDE
Model1
ADuM3154ARSZ
ADuM3154ARSZ-RL7
No. of
Inputs,
VDD1 Side
5
5
No. of
Inputs,
VDD2 Side
1
1
Maximum
Data Rate (MHz)
1
1
Maximum
Propagation
Delay, 5 V (ns)
25
25
Isolation
Rating
(V rms)
3750
3750
Temperature
Range
−40°C to +125°C
−40°C to +125°C
ADuM3154BRSZ
ADuM3154BRSZ-RL7
5
5
1
1
17
17
14
14
3750
3750
−40°C to +125°C
−40°C to +125°C
EVAL-ADuM3154Z
1
Z = RoHS Compliant Part.
©2014–2015 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D12369-0-3/15(A)
Rev. A | Page 22 of 22
Package
Description
20-Lead SSOP
20-Lead SSOP,
7” Tape and Reel
20-Lead SSOP
20-Lead SSOP,
7” Tape and Reel
Evaluation Board
Package
Option
RS-20
RS-20
RS-20
RS-20