Signal and Power Isolated CAN Transceiver
with Integrated Isolated DC-to-DC Converter
Data Sheet ADM3053
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
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FEATURES
2.5 kV rms signal and power isolated CAN transceiver
isoPower integrated isolated dc-to-dc converter
5 V operation on VCC
5 V or 3.3 V operation on VIO
Complies with ISO 11898 standard
High speed data rates of up to 1 Mbps
Unpowered nodes do not disturb the bus
Connect 110 or more nodes on the bus
Slope control for reduced EMI
Thermal shutdown protection
High common-mode transient immunity: >25 kV/μs
Safety and regulatory approvals
UL recognition
2500 V rms for 1 minute per UL 1577
VDE Certificate of Conformity
DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01
VIORM = 560 V peak
Industrial operating temperature range (−40°C to +85°C)
Available in wide-body, 20-lead SOIC package
APPLICATIONS
CAN data buses
Industrial field networks
GENERAL DESCRIPTION
The ADM3053 is an isolated controller area network (CAN)
physical layer transceiver with an integrated isolated dc-to-dc
converter. The ADM3053 complies with the ISO 11898 standard.
The device employs Analog Devices, Inc., iCoupler® technology
to combine a 2-channel isolator, a CAN transceiver, and
Analog Devices isoPower® dc-to-dc converter into a single
SOIC surface mount package. An on-chip oscillator outputs a pair
of square waveforms that drive an internal transformer to provide
isolated power. The device is powered by a single 5 V supply
realizing a fully isolated CAN solution.
The ADM3053 creates a fully isolated interface between the
CAN protocol controller and the physical layer bus. It is capable
of running at data rates of up to 1 Mbps.
The device has current limiting and thermal shutdown features
to protect against output short circuits. The part is fully specified
over the industrial temperature range and is available in a
20-lead, wide-body SOIC package.
The ADM3053 contains isoPower technology that uses high
frequency switching elements to transfer power through the
transformer. Special care must be taken during printed circuit
board (PCB) layout to meet emissions standards. Refer to the
AN-0971 Application Note, Control of Radiated Emissions with
isoPower Devices, for details on board layout considerations.
FUNCTIONAL BLOCK DIAGRAM
ADM3053
TxD
V
CC
RxD
ISOLATION
BARRIER
GND1 GND2
LOGIC SIDE BUS SIDE
ENCODE
DECODE
DECODE
ENCODE
OSCILLATOR RECTIFIER
REGULATOR
V
ISOOUT
DIGITAL ISOLATION iCoupler
isoPower DC-TO-DC CONVERTER
V
IO
V
ISOIN
R
S
CANH
CANL
V
REF
REFERENCE
VOLTAGE
RECEIVER
CAN TRANSCEIVER
TxD
R
S
RxD
V
REF
GND2
V
CC
SLOPE/
STANDBY
DRIVER
PROTECTION
09293-001
Figure 1.
ADM3053 Data Sheet
Rev. A | Page 2 of 20
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 4
Switching Characteristics ............................................................ 4
Regulatory Information............................................................... 5
Insulation and Safety-Related Specifications............................ 5
VDE 0884 Insulation Characteristics ........................................ 6
Absolute Maximum Ratings............................................................ 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Typical Performance Characteristics ............................................. 9
Test Circuits..................................................................................... 12
Circuit Description......................................................................... 13
CAN Transceiver Operation..................................................... 13
Signal Isolation ........................................................................... 13
Power Isolation ........................................................................... 13
Truth Tables................................................................................. 13
Thermal Shutdown .................................................................... 13
DC Correctness and Magnetic Field Immunity........................... 13
Applications Information.............................................................. 15
PCB Layout ................................................................................. 15
EMI Considerations................................................................... 15
Insulation Lifetime..................................................................... 15
Typical Applications....................................................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
REVISION HISTORY
3/12—Rev. 0 to Rev. A
Changes to Features Section............................................................ 1
Changes to Table 3............................................................................ 5
Changes to VDE 0884 Insulation Characteristics Section.......... 6
Changes to Figure 6.......................................................................... 9
Changes to Figure 11...................................................................... 10
Changes to Applications Information Section............................ 15
5/11—Revision 0: Initial Version
Data Sheet ADM3053
Rev. A | Page 3 of 20
SPECIFICATIONS
All voltages are relative to their respective ground; 4.5 V ≤ VCC ≤ 5.5 V; 3.0 V ≤ VIO ≤ 5.5 V. All minimum/maximum specifications apply
over the entire recommended operation range, unless otherwise noted. All typical specifications are at TA = 25°C, VCC = 5 V, VIO = 5 V
unless otherwise noted.
Table 1.
Parameter Symbol Min Typ Max Unit Test Conditions
SUPPLY CURRENT
Logic Side isoPower Current
Recessive State ICC 29 36 mA RL = 60 Ω, RS = low, see Figure 25
Dominant State ICC 195 232 mA RL = 60 Ω, RS = low, see Figure 25
TxD/RxD Data Rate 1 Mbps ICC 139 170 mA RL = 60 Ω, RS = low, see Figure 25
Logic Side iCoupler Current
TxD/RxD Data Rate 1 Mbps IIO 1.6 2.5 mA
DRIVER
Logic Inputs
Input Voltage High VIH 0.7 VIO V Output recessive
Input Voltage Low VIL 0.25 VIO V Output dominant
CMOS Logic Input Currents IIH, IIL 500 µA TxD
Differential Outputs
Recessive Bus Voltage VCANL, VCANH 2.0 3.0 V TxD = high, RL = ∞, see Figure 22
CANH Output Voltage VCANH 2.75 4.5 V TxD = low, see Figure 22
CANL Output Voltage VCANL 0.5 2.0 V TxD = low, see Figure 22
Differential Output Voltage VOD 1.5 3.0 V TxD = low, RL = 45 Ω, see Figure 22
V
OD −500 +50 mV TxD = high, RL = ∞, see Figure 22
Short-Circuit Current, CANH ISCCANH −200 mA VCANH = −5 V
−100 mA VCANH = −36 V
Short-Circuit Current, CANL ISCCANL 200 mA VCANL = 36 V
RECEIVER
Differential Inputs
Differential Input Voltage Recessive VIDR −1.0 +0.5 V
−7 V < VCANL, VCANH < +12 V, see Figure 23,
CL = 15 pF
Differential Input Voltage Dominant VIDD 0.9 5.0 V
−7 V < VCANL, VCANH < +12 V, see Figure 23,
CL = 15 pF
Input Voltage Hysteresis VHYS 150 mV See Figure 3
CANH, CANL Input Resistance RIN 5 25 kΩ
Differential Input Resistance RDIFF 20 100 kΩ
Logic Outputs
Output Low Voltage VOL 0.2 0.4 V IOUT = 1.5 mA
Output High Voltage VOH V
IO − 0.3 VIO − 0.2 V IOUT = −1.5 mA
Short Circuit Current IOS 7 85 mA VOUT = GND1 or VIO
VOLTAGE REFERENCE
Reference Output Voltage VREF 2.025 3.025 V |IREF = 50 µA|
COMMON-MODE TRANSIENT IMMUNITY1 25 kV/µs VCM = 1 kV, transient magnitude = 800 V
SLOPE CONTROL
Current for Slope Control Mode ISLOPE −10 −200 µA
Slope Control Mode Voltage VSLOPE 1.8 3.3 V
1 CM is the maximum common-mode voltage slew rate that can be sustained while maintaining specification-compliant operation. VCM is the common-mode potential
difference between the logic and bus sides. The transient magnitude is the range over which the common mode is slewed. The common-mode voltage slew rates
apply to both rising and falling common-mode voltage edges.
ADM3053 Data Sheet
Rev. A | Page 4 of 20
TIMING SPECIFICATIONS
All voltages are relative to their respective ground; 3.0 V ≤ VIO ≤ 5.5 V; 4.5 V ≤ VCC ≤ 5.5 V. TA = −40°C to +85°C, unless otherwise noted.
Table 2.
Parameter Symbol Min Typ Max Unit Test Conditions
DRIVER
Maximum Data Rate 1 Mbps
Propagation Delay from TxD On to Bus Active tonTxD 90 ns RS = 0 Ω; see Figure 2 and Figure 24
RL = 60 Ω, CL = 100 pF
Propagation Delay from TxD Off to Bus Inactive toffTxD 120 ns RS = 0 Ω; see Figure 2 and Figure 24
RL = 60 Ω, CL = 100 pF
RECEIVER
Propagation Delay from TxD On to Receiver Active tonRxD 200 ns RS = 0 Ω; see Figure 2
630 ns RS = 47 kΩ; see Figure 2
Propagation Delay from TxD Off to Receiver Inactive1 t
offRxD 250 ns RS = 0 Ω; see Figure 2
480 ns RS = 47 kΩ; see Figure 2
CANH, CANL SLEW RATE |SR| 7 V/µs RS = 47 kΩ
1 Guaranteed by design and characterization.
SWITCHING CHARACTERISTICS
0.25V
IO
0.9V
V
OR
V
OD
0V
0V
V
IO
0.5V
0.4V
V
DIFF
V
RxD
V
IO
V
TxD
V
IO
– 0.3V
0.7V
IO
V
DIFF
= V
CANH
– V
CANL
t
onTxD
t
offTxD
t
onRxD
t
offRxD
09293-002
Figure 2. Driver Propagation Delay, Rise/Fall Timing
Data Sheet ADM3053
Rev. A | Page 5 of 20
0.5 0.9
VRxD
HIGH
LOW
VHYS
VID (V)
09293-004
Figure 3. Receiver Input Hysteresis
REGULATORY INFORMATION
Table 3. ADM3053 Approvals
Organization Approval Type Notes
UL Recognized under the Component
Recognition Program of Underwriters
Laboratories, Inc.
In accordance with UL 1577, each ADM3053 is proof tested by applying
an insulation test voltage ≥2500 V rms for 1 second. File E214100.
VDE Certified according to DIN EN 60747-5-2 (VDE
0884 Part 2): 2003-01 In accordance with VDE 0884-2. File 2471900-4880-0001.
INSULATION AND SAFETY-RELATED SPECIFICATIONS
Table 4.
Parameter Symbol Value Unit Conditions
Rated Dielectric Insulation Voltage 2500 V rms 1-minute duration
Minimum External Air Gap (Clearance) L(I01) 7.7 mm Measured from input terminals to output terminals,
shortest distance through air
Minimum External Tracking (Creepage) L(I02) 7.6 mm Measured from input terminals to output terminals,
shortest distance along body
Minimum Internal Gap (Internal
Clearance)
0.017 min mm Insulation distance through insulation
Tracking Resistance (Comparative
Tracking Index)
CTI >175 V DIN IEC 112/VDE 0303-1
Isolation Group IIIa Material group (DIN VDE 0110: 1989-01, Table 1)
ADM3053 Data Sheet
Rev. A | Page 6 of 20
VDE 0884 INSULATION CHARACTERISTICS
This isolator is suitable for basic electrical isolation only within the safety limit data. Maintenance of the safety data must be ensured by
means of protective circuits.
Table 5.
Description Conditions Symbol Characteristic Unit
CLASSIFICATIONS
Installation Classification per DIN VDE 0110 for Rated
Mains Voltage
≤150 V rms I to IV
≤300 V rms I to III
≤400 V rms I to II
Climatic Classification 40/85/21
Pollution Degree DIN VDE 0110, see Table 3 2
VOLTAGE
Maximum Working Insulation Voltage VIORM 560 VPEAK
Input-to-Output Test Voltage VPR
Method b1 VIORM × 1.875 = VPR, 100% production tested,
tm = 1 sec, partial discharge < 5 pC
1050 VPEAK
Highest Allowable Overvoltage (Transient overvoltage, tTR = 10 sec) VTR 4000 VPEAK
SAFETY-LIMITING VALUES Maximum value allowed in the event of a
failure
Case Temperature TS 150 °C
Input Current IS, INPUT 265 mA
Output Current IS, OUTPUT 335 mA
Insulation Resistance at TS V
IO = 500 V RS >109 Ω
Data Sheet ADM3053
Rev. A | Page 7 of 20
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted. All voltages are relative to
their respective ground.
Table 6.
Parameter Rating
VCC −0.5 V to +6 V
VIO −0.5 V to +6 V
Digital Input Voltage, TxD −0.5 V to VIO + 0.5 V
Digital Output Voltage, RxD −0.5 V to VIO + 0.5 V
CANH, CANL −36 V to +36 V
VREF −0.5 V to +6 V
RS −0.5 V to +6 V
Operating Temperature Range −40°C to +85°C
Storage Temperature Range −55°C to +150°C
ESD (Human Body Model) 3 kV
Lead Temperature
Soldering (10 sec) 300°C
Vapor Phase (60 sec) 215°C
Infrared (15 sec) 220°C
θJA Thermal Impedance 53°C/W
TJ Junction Temperature 130°C
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 7. Maximum Continuous Working Voltage1
Parameter Max Unit Reference Standard
AC Voltage
Bipolar Waveform 424 V peak 50 year minimum
lifetime
Unipolar Waveform
Basic Insulation 560 V peak Maximum approved
working voltage per
VDE 0884 Part 2
DC Voltage
Basic Insulation 560 V peak Maximum approved
working voltage per
VDE 0884 Part 2
1 Refers to continuous voltage magnitude imposed across the isolation
barrier. See the Insulation Lifetime section for more details.
ESD CAUTION
ADM3053 Data Sheet
Rev. A | Page 8 of 20
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
GND1
1
NC
2
GND1
3
RxD
4
GND2
20
V
ISOIN
19
R
S
18
CANH
17
TxD
5
GND2
16
V
IO 6
CANL
15
GND1
7
V
REF
14
V
CC 8
GND2
13
GND1
9
V
ISOOUT
12
GND1
10
GND2
11
ADM3053
TOP VIEW
(Not to Scale)
NOTES
1. NC = NO CONNECT. DO NOT
CONNECT TO THIS PIN.
2. PIN 12 AND PIN 19 MUST BE
CONNECTED EXTERNALLY.
09293-005
Figure 4. Pin Configuration
Table 8. Pin Function Descriptions
Pin No. Mnemonic Description
1 GND1 Ground, Logic Side.
2 NC No Connect. Do not connect to this pin.
3 GND1 Ground, Logic Side.
4 RxD Receiver Output Data.
5 TxD Driver Input Data.
6 VIO iCoupler Power Supply. It is recommended that a 0.1 F and a 0.01 F decoupling capacitor be fitted
between Pin 6 and GND1. See Figure 28 for layout recommendations.
7 GND1 Ground, Logic Side.
8 VCC isoPower Power Supply. It is recommended that a 0.1 F and a 10 F decoupling capacitor be fitted
between Pin 8 and Pin 9.
9 GND1 Ground, Logic Side.
10 GND1 Ground, Logic Side.
11 GND2 Ground, Bus Side.
12 VISOOUT Isolated Power Supply Output. This pin must be connected externally to VISOIN. It is recommended that a
reservoir capacitor of 10 F and a decoupling capacitor of 0.1 F be fitted between Pin 12 and Pin 11.
13 GND2 Ground (Bus Side).
14 VREF Reference Voltage Output.
15 CANL Low-Level CAN Voltage Input/Output.
16 GND2 Ground (Bus Side).
17 CANH High-Level CAN Voltage Input/Output.
18 RS Slope Resistor Input.
19 VISOIN Isolated Power Supply Input. This pin must be connected externally to VISOOUT. It is recommended that a 0.1 F
and a 0.01 F decoupling capacitor be fitted between Pin 19 and Pin 20.
20 GND2 Ground (Bus Side).
Data Sheet ADM3053
Rev. A | Page 9 of 20
TYPICAL PERFORMANCE CHARACTERISTICS
160
0
20
40
60
80
100
120
140
100 1000
SUPPLY CURRENT, I
CC
(mA)
DATA RATE (kbps)
V
CC
= 4.5V, V
IO
= 5V
V
CC
= 5.5V, V
IO
= 5V
V
CC
= 5V, V
IO
= 5V
09293-100
Figure 5. Supply Current, ICC vs. Data Rate
50
45
40
35
30
25
20
15
10
5
0
0 1020304050607080
SLEW RATE (V/µs)
RESISTANCE, R
S
(kΩ)
09293-101
Figure 6. Driver Slew Rate vs. Resistance, RS
5.5
4.5
3.5
2.5
1.5
0.5
100 1000
SUPPLY CURRENT, I
IO
(mA)
DATA RATE (kbps)
V
IO
= 3.3V
V
IO
= 5V
09293-102
Figure 7. Supply Current, IIO vs. Data Rate
180
175
170
165
160
155
150
–40 85603510–15
RECEIVER INPUT HYSTERESIS (mV)
TEMPERATURE (°C)
V
CC
= 5V, V
IO
= 5V
V
CC
= 5V, V
IO
= 3.3V
09293-103
Figure 8. Receiver Input Hysteresis vs. Temperature
53
52
51
50
49
48
47
–40 85603510–15
PROPAGATION DELAY TxD ON TO BUS ACTIVE,
t
onTxD
(ns)
TEMPERATURE (°C)
V
CC
= 5V, V
IO
= 5V
V
CC
= 5V, V
IO
= 3.3V
09293-104
Figure 9. Propagation Delay from TxD On to Bus Active vs. Temperature
96
94
92
90
88
86
84
82
80
78
–40 85603510–15
PROPAGATION DELAY TxD OFF TO BUS
INACTIVE, t
offTxD
(ns)
TEMPERATURE (°C)
V
CC
= 5V, V
IO
= 5V
V
CC
= 5V, V
IO
= 3.3V
09293-105
Figure 10. Propagation Delay from TxD Off to Bus Inactive vs. Temperature
ADM3053 Data Sheet
Rev. A | Page 10 of 20
152
150
148
146
144
142
140
138
136
134
–40 85603510–15
PROPAGATION DELAY TxD ON TO RECEIVE
R
ACTIVE,
t
onRxD
(ns)
TEMPERATURE (°C)
V
CC
= 5V, V
IO
= 5V, R
S
= 0Ω
V
CC
= 5V, V
IO
= 3.3V, R
S
= 0Ω
09293-106
Figure 11. Propagation Delay from TxD Off to Bus Inactive vs. Temperature
600
500
400
300
200
100
0
–40 85603510–15
PROPAGATION DELAY TxD ON TO RECEIVE
R
ACTIVE,
t
onRxD
(ns)
TEMPERATURE (°C)
V
CC
= 5V, V
IO
= 5V, R
S
= 47kΩ
V
CC
= 5V, V
IO
= 3.3V, R
S
= 47kΩ
09293-107
Figure 12. Propagation Delay from TxD On to Receiver Active vs.
Temperature
250
200
150
100
50
0
–40 85603510–15
PROPAGATION DELAY TxD OFF TO RECEIVE
R
INACTIVE,
t
offRxD
(ns)
TEMPERATURE (°C)
V
CC
= 5V, V
IO
= 5V, R
S
= 0Ω
V
CC
= 5V, V
IO
= 3.3V, R
S
= 0Ω
09293-108
Figure 13. Propagation Delay from TxD Off to Receiver Inactive vs.
Temperature
330
325
320
315
310
305
300
295
290
285
280
275
–40 85603510–15
PROPAGATION DELAY TxD OFF TO RECEIVE
R
INACTIVE,
t
offRxD
(ns)
TEMPERATURE (°C)
V
CC
= 5V, V
IO
= 5V, R
S
= 47kΩ
V
CC
= 5V, V
IO
= 3.3V, R
S
= 47kΩ
09293-109
Figure 14. Propagation Delay from TxD Off to Receiver Inactive vs.
Temperature
2.55
2.50
2.45
2.40
2.35
2.30
2.25
–40 85603510–15
DIFFERENTIAL OUTPUT VOLTAGE DOMINANT,
V
OD
(V)
TEMPERATURE (°C)
V
CC
= 5V, V
IO
= 5V, R
L
= 60Ω
V
CC
= 5V, V
IO
= 3.3V, R
L
= 60Ω
V
CC
= 5V, V
IO
= 5V, R
L
= 45Ω
V
CC
= 5V, V
IO
= 3.3V, R
L
= 45Ω
09293-110
Figure 15. Differential Output Voltage Dominant vs. Temperature
2.55
2.50
2.45
2.40
2.35
2.30
2.25
4.5 5.55.35.14.94.7
DIFFERENTIAL OUTPUT VOLTAGE DOMINANT,
V
OD
(V)
SUPPLY VOLTAGE, V
CC
(V)
V
IO
= 5V, T
A
= 25°C, R
L
= 60Ω
V
IO
= 5V, T
A
= 25°C, R
L
= 45Ω
09293-111
Figure 16. Differential Output Voltage Dominant vs. Supply Voltage, VCC
Data Sheet ADM3053
Rev. A | Page 11 of 20
2.80
2.75
2.70
2.65
2.60
2.55
2.50
2.45
2.40
–40 85603510–15
REFERENCE VOLTAGE, V
REF
(V)
TEMPERATURE (°C)
V
CC
= 5V, V
IO
= 5V, I
REF
= +50µA
V
CC
= 5V, V
IO
= 5V, I
REF
= –50µA
V
CC
= 5V, V
IO
=5V, I
REF
= +5µA
V
CC
= 5V, V
IO
= 5V, I
REF
= –5µA
09293-112
Figure 17. Reference Voltage vs. Temperature
160
140
120
100
80
60
40
20
0
–40 85603510–15
SUPPLY CURRENT, I
CC
(mA)
TEMPERATURE (°C)
V
CC
= 5V
V
IO
= 5V
DATA RATE = 1Mbps
R
L
= 60Ω
09293-113
Figure 18. Supply Current ICC vs. Temperature
140
138
136
134
132
130
128
126
124
122
120
118
4.5 5.55.45.35.25.15.04.94.84.74.6
SUPPLY CURRENT, I
CC
(mA)
SUPPLY VOLTAGE, V
CC
(V)
V
IO
= 5V
T
A
= 25°C
DATA RATE = 1Mbps
09293-114
Figure 19. Supply Current, ICC vs. Supply Voltage VCC
–40 85603510–15
RECEIVER OUTPUT HIGH VOLTAGE, V
OH
(V)
TEMPERATURE (°C)
V
CC
= 5V, V
IO
= 5V, I
OUT
= –1.5mA
4.855
4.860
4.865
4.870
4.875
4.880
4.885
4.890
4.895
09293-115
Figure 20. Receiver Output High Voltage vs. Temperature
–40 85603510–15
RECEIVER OUTPUT LOW VOLTAGE, V
OL
(mV)
TEMPERATURE (°C)
0
120
100
80
60
40
20
09293-116
Figure 21. Receiver Output Low Voltage vs. Temperature
ADM3053 Data Sheet
Rev. A | Page 12 of 20
TEST CIRCUITS
TxD V
OD
V
CANH
V
CANH
V
OC
R
L
R
L
2
2
09293-006
Figure 22. Driver Voltage Measurement
C
L
RxD
CANH
CANL
V
ID
09293-007
Figure 23. Receiver Voltage Measurements
CANH
CANL
TxD
RxD
C
L
R
L
15pF
09293-008
Figure 24. Switching Characteristics Measurements
R
L
R
S
10µF100nF
10µF 100nF
10µF100nF10µF100nF
ADM3053
TxD
RxD
ISOLATION
BARRIER
GND1 GND2
LOGIC SIDE BUS SIDE
ENCODE
DECODE
DECODE
ENCODE
OSCILLATOR RECTIFIER
REGULATOR
V
ISOOUT
DIGITAL ISOLATION iCoupler
isoPower DC-TO-DC CONVERTER
V
IO
V
ISOIN
R
S
CANH
CANL
V
REF
REFERENCE
VOLTAGE
RECEIVER
CAN TRANSCEIVER
TxD
R
S
RxD
V
REF
GND2
V
CC
SLOPE/
STANDBY
DRIVER
PROTECTION
V
CC
09293-009
Figure 25. Supply Current Measurement Test Circuit
Data Sheet ADM3053
Rev. A | Page 13 of 20
CIRCUIT DESCRIPTION
CAN TRANSCEIVER OPERATION
A CAN bus has two states called dominant and recessive. A
dominant state is present on the bus when the differential
voltage between CANH and CANL is greater than 0.9 V. A
recessive state is present on the bus when the differential voltage
between CANH and CANL is less than 0.5 V. During a dominant
bus state, the CANH pin is high, and the CANL pin is low.
During a recessive bus state, both the CANH and CANL pins
are in the high impedance state.
Pin 18 (RS) allows two different modes of operation to be
selected: high-speed and slope control. For high-speed
operation, the transmitter output transistors are simply
switched on and off as fast as possible. In this mode, no
measures are taken to limit the rise and fall slopes. A shielded
cable is recommended to avoid EMI problems. High-speed
mode is selected by connecting Pin 18 to ground.
Slope control mode allows the use of an unshielded twisted pair
or a parallel pair of wires as bus lines. To reduce EMI, the rise
and fall slopes should be limited. The rise and fall slopes can be
programmed with a resistor connected from Pin 18 to ground.
The slope is proportional to the current output at Pin 18.
SIGNAL ISOLATION
The ADM3053 signal isolation is implemented on the logic side of
the interface. The part achieves signal isolation by having a
digital isolation section and a transceiver section (see Figure 1).
Data applied to the TxD pin referenced to logic ground (GND1)
are coupled across an isolation barrier to appear at the transceiver
section referenced to isolated ground (GND2). Similarly, the
single-ended receiver output signal, referenced to isolated
ground in the transceiver section, is coupled across the isolation
barrier to appear at the RxD pin referenced to logic ground
(GND1). The signal isolation is powered by the VIO pin and
allows the digital interface to 3.3 V or 5 V logic.
POWER ISOLATION
The ADM3053 power isolation is implemented using an
isoPower integrated isolated dc-to-dc converter. The dc-to-dc
converter section of the ADM3053 works on principles that are
common to most modern power supplies. It is a secondary side
controller architecture with isolated pulse-width modulation
(PWM) feedback. VCC power is supplied to an oscillating circuit
that switches current into a chip-scale air core transformer.
Power transferred to the secondary side is rectified and regulated to
5 V. The secondary (VISO) side controller regulates the output by
creating a PWM control signal that is sent to the primary (VCC)
side by a dedicated iCoupler data channel. The PWM modulates
the oscillator circuit to control the power being sent to the
secondary side. Feedback allows for significantly higher power
and efficiency.
TRUTH TABLES
The truth tables in this section use the abbreviations found in
Tabl e 9.
Table 9. Truth Table Abbreviations
Letter Description
H High level
L Low level
X Don’t care
Z High impedance (off)
I Indeterminate
NC Not connected
Table 10. Transmitting
Supply Status Input Outputs
VIO V
CC TxD Bus State CANH CANL
On On L Dominant H L
On On H Recessive Z Z
On On Floating Recessive Z Z
Off On X Recessive Z Z
On Off L Indeterminate I I
Table 11. Receiving
Supply Status Inputs Output
VIO V
CC V
ID = CANH − CANL Bus State RxD
On On ≥ 0.9 V Dominant L
On On ≤ 0.5 V Recessive H
On On 0.5 V < VID < 0.9 V X1 I
On On Inputs open Recessive H
Off On X1 X1 I
On Off X1 X1 H
1X = don’t care.
THERMAL SHUTDOWN
The ADM3053 contains thermal shutdown circuitry that protects
the part from excessive power dissipation during fault conditions.
Shorting the driver outputs to a low impedance source can
result in high driver currents. The thermal sensing circuitry
detects the increase in die temperature under this condition and
disables the driver outputs. This circuitry is designed to disable
the driver outputs when a die temperature of 150°C is reached.
As the device cools, the drivers are reenabled at a temperature of
140°C.
DC CORRECTNESS AND MAGNETIC FIELD IMMUNITY
The digital signals transmit across the isolation barrier using
iCoupler technology. This technique uses chip-scale transformer
windings to couple the digital signals magnetically from one
side of the barrier to the other. Digital inputs are encoded into
waveforms that are capable of exciting the primary transformer
ADM3053 Data Sheet
Rev. A | Page 14 of 20
winding. At the secondary winding, the induced waveforms are
decoded into the binary value that was originally transmitted.
Positive and negative logic transitions at the isolator input cause
narrow (~1 ns) pulses to be sent to the decoder via the transformer.
The decoder is bistable and is, therefore, either set or reset by
the pulses, indicating input logic transitions. In the absence of
logic transitions at the input for more than 1 µs, periodic sets of
refresh pulses indicative of the correct input state are sent to
ensure dc correctness at the output. If the decoder receives no
internal pulses of more than approximately 5 s, the input side
is assumed to be unpowered or nonfunctional, in which case,
the isolator output is forced to a default state by the watchdog
timer circuit.
This situation should occur in the ADM3053 devices only during
power-up and power-down operations. The limitation on the
ADM3053 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 the conditions under which this
can occur.
The 3.3 V operating condition of the ADM3053 is examined
because it represents the most susceptible mode of operation.
The pulses at the transformer output have an amplitude of >1.0 V.
The decoder has a sensing threshold of about 0.5 V, thus
establishing a 0.5 V margin in which induced voltages can be
tolerated. The voltage induced across the receiving coil is
given by
V = (−dβ/dt)Σπrn2; n = 1, 2, … , N
where:
β is magnetic flux density (gauss).
N is the number of turns in the receiving coil.
rn is the radius of the nth turn in the receiving coil (cm).
Given the geometry of the receiving coil in the ADM3053 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 26.
MAGNETIC FIELD FREQUENCY (Hz)
100
MAXIMUM ALLOWABLE MAGNETIC FLUX
DENSITY (kgauss)
0.001
1M
10
0.01
1k 10k 10M
0.1
1
100M100k
09293-010
Figure 26. Maximum Allowable External Magnetic Flux Density
For example, at a magnetic field frequency of 1 MHz, the
maximum allowable magnetic field of 0.2 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.
Similarly, if such an event occurs during a transmitted pulse
(and is of the worst-case polarity), it reduces the received pulse
from >1.0 V to 0.75 V, which 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 from the
ADM3053 transformers. Figure 27 expresses these allowable
current magnitudes as a function of frequency for selected
distances. As shown in Figure 27, the ADM3053 is extremely
immune and can be affected only by extremely large currents
operated at high frequency very close to the component. For the
1 MHz example, a 0.5 kA current must be placed 5 mm away from
the ADM3053 to affect component operation.
MAGNETIC FIELD FREQUENCY (Hz)
MAXIMUM ALLOWABLE CURRENT (kA)
1k
100
10
1
0.1
0.01
1k 10k 100M100k 1M 10M
DISTANCE = 5mm
DISTANCE = 1m
DISTANCE = 100mm
09293-011
Figure 27. Maximum Allowable Current for Various Current-to-ADM3053
Spacings
Note that in combinations of strong magnetic field and high
frequency, any loops formed by the printed circuit board (PCB)
traces can induce error voltages sufficiently large to trigger the
thresholds of succeeding circuitry. Proceed with caution in the
layout of such traces to prevent this from occurring.
Data Sheet ADM3053
Rev. A | Page 15 of 20
APPLICATIONS INFORMATION
PCB LAYOUT
The ADM3053 signal and power isolated CAN transceiver
contains an isoPower integrated dc-to-dc converter, requiring
no external interface circuitry for the logic interfaces. Power
supply bypassing is required at the input and output supply pins
(see Figure 28). The power supply section of the ADM3053 uses
a 180 MHz oscillator frequency to pass power efficiently through
its chip-scale transformers. In addition, the normal operation of
the data section of the iCoupler introduces switching transients
on the power supply pins.
Bypass capacitors are required for several operating frequencies.
Noise suppression requires a low inductance, high frequency
capacitor, whereas ripple suppression and proper regulation
require a large value capacitor. These capacitors are connected
between GND1 and Pin 6 (VIO) for VIO. It is recommended that
a combination of 100 nF and 10 nF be placed as shown in Figure
28 (C6 and C4). It is recommended that a combination of two
capacitors, with values of 100 nF and 10 µF, are placed between
Pin 8 (VCC) and Pin 9 (GND1) for VCC as shown in Figure 28 (C2
and C1). The VISOIN and VISOOUT capacitors are connected between
Pin 11 (GND2) and Pin 12 (VISOOUT) with recommended values
of 100 nF and 10 µF as shown in Figure 28 (C5 and C8). Two
capacitors are recommended to be fitted Pin 19 (VISOIN) and Pin 20
(GND2) with values of 100nF and 10nF as shown in Figure 28
(C9 and C7). The best practice recommended is to use a very low
inductance ceramic capacitor, or its equivalent, for the smaller
value. The total lead length between both ends of the capacitor
and the input power supply pin should not exceed 10 mm.
09293-012
Figure 28. Recommended PCB Layout
In applications involving high common-mode transients, ensure
that board coupling across the isolation barrier is minimized.
Furthermore, design the board layout such that any coupling
that does occur equally affects all pins on a given component
side. Failure to ensure this can cause voltage differentials between
pins exceeding the absolute maximum ratings for the device,
thereby leading to latch-up and/or permanent damage.
The ADM3053 dissipates approximately 650 mW of power
when fully loaded. Because it is not possible to apply a heat sink
to an isolation device, the devices primarily depend on heat
dissipation into the PCB through the GND pins. If the devices
are used at high ambient temperatures, provide a thermal path
from the GND pins to the PCB ground plane. The board layout
in Figure 28 shows enlarged pads for Pin 1, Pin 3, Pin 9, Pin 10,
Pin 11, Pin 14, Pin 16, and Pin 20. Implement multiple vias from
the pad to the ground plane to reduce the temperature inside the
chip significantly. The dimensions of the expanded pads are at
the discretion of the designer and dependent on the available
board space.
EMI CONSIDERATIONS
The dc-to-dc converter section of the ADM3053 must, of
necessity, operate at very high frequency to allow efficient
power transfer through the small transformers. This creates
high frequency currents that can propagate in circuit board
ground and power planes, causing edge and dipole radiation.
Grounded enclosures are recommended for applications that
use these devices. If grounded enclosures are not possible, good
RF design practices should be followed in the layout of the PCB.
See the AN-0971 Application Note, Control of Radiated Emissions
with isoPower Devices, for more information.
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. Analog Devices conducts
an extensive set of evaluations to determine the lifetime of the
insulation structure within the ADM3053.
Accelerated life testing is performed using voltage levels higher
than the rated continuous working voltage. Acceleration factors for
several operating conditions are determined, allowing calculation
of the time to failure at the working voltage of interest. The values
shown in Table 5 summarize the peak voltages for 50 years of
service life in several operating conditions. In many cases, the
working voltage approved by agency testing is higher than the 50
year service life voltage. Operation at working voltages higher than
the service life voltage listed leads to premature insulation
failure.
The insulation lifetime of the ADM3053 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 29,
Figure 30, and Figure 31 illustrate these different isolation voltage
waveforms.
ADM3053 Data Sheet
Rev. A | Page 16 of 20
Bipolar ac voltage is the most stringent environment. A 50 year
operating lifetime under the bipolar ac condition determines
the Analog Devices recommended maximum working voltage.
In the case of unipolar ac or dc voltage, the stress on the insulation
is significantly lower. This allows operation at higher working
voltages while still achieving a 50 year service life. The working
voltages listed in Table 5 can be applied while maintaining the
50 year minimum lifetime, provided the voltage conforms to either
the unipolar ac or dc voltage cases. Any cross insulation voltage
waveform that does not conform to Figure 30 or Figure 31 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 5.
0V
RATED PEAK VOLTAGE
09293-013
Figure 29. Bipolar AC Waveform
0V
RATED PEAK VOLTAGE
09293-014
Figure 30. DC Waveform
0V
RATED PEAK VOLTAGE
NOTES
1. THE VOLTAGE IS SHOWN AS SINUSODIAL FOR ILLUSTRATION
PURPOSES ONLY. IT IS MEANT TO REPRESENT ANY VOLTAGE
WAVEFORM VARYING BETWEEN 0 AND SOME LIMITING VALUE.
THE LIMITING VALUE CAN BE POSITIVE OR NEGATIVE, BUT THE
VOLTAGE CANNOT CROSS 0V.
09293-015
Figure 31. Unipolar AC Waveform
Data Sheet ADM3053
Rev. A | Page 17 of 20
TYPICAL APPLICATIONS
Figure 32 is an example circuit diagram using the ADM3053.
CAN
CONTROLLER
3.3V/5V
SUPPLY
100nF10nF 100nF 10nF
CANH
CANL
R
T
BUS
CONNECTOR
5V
SUPPLY
100nF10µF
10µF100nF
R
S
ADM3053
TxD
RxD
ISOLATION
BARRIER
GND1 GND2
LOGIC SIDE BUS SIDE
ENCODE
DECODE
DECODE
ENCODE
OSCILLATOR RECTIFIER
REGULATOR
V
ISOOUT
DIGITAL ISOLATION iCoupler
isoPowerDC-TO-DC CONVERTER
V
IO
V
ISOIN
R
S
CANH
CANL
V
REF
REFERENCE
VOLTAGE
RECEIVER
CAN TRANSCEIVER
TxD
R
S
RxD
V
REF
GND2
V
CC
SLOPE/
STANDBY
DRIVER
PROTECTION
V
CC
09293-016
Figure 32. Example Circuit Diagram Using the ADM3053
ADM3053 Data Sheet
Rev. A | Page 18 of 20
OUTLINE DIMENSIONS
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
COMPLIANT TO JEDEC STANDARDS MS-013-AC
13.00 (0.5118)
12.60 (0.4961)
0.30 (0.0118)
0.10 (0.0039)
2.65 (0.1043)
2.35 (0.0925)
10.65 (0.4193)
10.00 (0.3937)
7.60 (0.2992)
7.40 (0.2913)
0.75(0.0295)
0.25(0.0098)
45°
1.27 (0.0500)
0.40 (0.0157)
COPLANARITY
0.10 0.33 (0.0130)
0.20 (0.0079)
0.51 (0.0201)
0.31 (0.0122)
SEATING
PLANE
8°
0°
20 11
10
1
1.27
(0.0500)
BSC
06-07-2006-A
Figure 33. 20-Lead Standard Small Outline Package [SOIC_W]
Wide Body
(RW-20)
Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model1 Temperature Range Package Description Package Option
ADM3053BRWZ −40°C to +85°C 20-Lead SOIC_W RW-20
ADM3053BRWZ-REEL7 −40°C to +85°C 20-Lead SOIC_W RW-20
EVAL-ADM3053EBZ ADM3053 Evaluation Board
1 Z = RoHS Compliant Part.
Data Sheet ADM3053
Rev. A | Page 19 of 20
NOTES
ADM3053 Data Sheet
Rev. A | Page 20 of 20
NOTES
©2011–2012 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D09293-0-3/12(A)