Datasheet ADUM7234 Datasheet (ANALOG DEVICES)

Isolated Precision Half-Bridge Driver,

FEATURES

Isolated high-side and low-side outputs
Working Voltage

High-side or low-side relative to input: ±350 V
High-side/low-side differential: 350 V

peak
4 A peak output current
High frequency operation: 1 MHz maximum
High common-mode transient immunity: >25 kV/μs
High temperature operation: 105°C
Narrow body, 16-lead SOIC
Safety and regulatory approvals (pending)

UL recognition

UL 1577 1000 V rms input-to-output withstand voltage

APPLICATIONS

Isolated IGBT/MOSFET gate drives
Plasma displays
Industrial inverters
Switching power supplies

peak

FUNCTIONAL BLOCK DIAGRAM

4 A Output

ADuM7234

GENERAL DESCRIPTION

The ADuM72341 is an isolated, half-bridge gate driver that
employs the Analog Devices, Inc., iCoupler® technology to
provide independent and isolated high-side and low-side
outputs. Combining high speed CMOS and monolithic
transformer technology, this isolation component provides
outstanding performance characteristics superior to
optocoupler-based solutions.

By avoiding the use of LEDs and photodiodes, this iCoupler
gate drive device is able to provide precision timing characteristics
not possible with optocouplers. Furthermore, the reliability and
performance stability problems associated with optocoupler
LEDs are avoided.

In comparison to gate drivers employing high voltage level
translation methodologies, the ADuM7234 offers the benefit of
true, galvanic isolation between the input and each output and
between each input. Each output may be operated up to ±350 V
peak relative to the input, thereby supporting low-side switching
to negative voltages. The differential voltage between the high
side and low side may be as high as 350 V peak.

As a result, the ADuM7234 provides reliable control over the
switching characteristics of IGBT/MOSFET configurations over
a wide range of positive or negative switching voltages.

NC

V

V

V

DD1

GND

DISABLE

V

DD1

NC

IA

IB

1

ADuM7234

1 16

2 15

3 14

4 13

5

6

7

8

ENCODE DECODE

ENCODE DECODE

1

Protected by U.S. Patents 5,952,849 and 6,291,907.

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
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.

V

DDA

V

OA

GND

A

NC

12

NC

11

V

DDB

10

V

OB

9

GND

B

07990-001

Figure 1.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2010 Analog Devices, Inc. All rights reserved.

ADuM7234

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1 

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications ..................................................................................... 3

Electrical Characteristics ............................................................. 3

Package Characteristics ............................................................... 4

Insulation and Safety-Related Specifications ............................ 4

Recommended Operating Conditions ...................................... 4

REVISION HISTORY

1/10—Rev. Sp0 to Rev. A

Changes to Table 1 ............................................................................ 3

1/09—Revision Sp0: Initial Version

Regulatory Information ................................................................4

Absolute Maximum Ratings ............................................................5

ESD Caution...................................................................................5

Pin Configuration and Function Descriptions ..............................6

Typical Performance Characteristics ..............................................7

Applications Information .................................................................8

Common-Mode Transient Immunity ........................................8

Insulation Lifetime ........................................................................9

Outline Dimensions ....................................................................... 10

Ordering Guide .......................................................................... 10

Rev. A | Page 2 of 12

ADuM7234

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

All voltages are relative to their respective ground. 4.5 V ≤ V
specifications apply over the entire recommended operating range, unless otherwise noted. All typical specifications are at T
V

= 5 V, V

DD1

= 15 V, V

DDA

= 15 V.

DDB

Table 1.

Parameter Symbol Min Typ Max Unit Test Conditions

DC SPECIFICATIONS

Input Supply Current, Quiescent I
Output Supply Current A or Output Supply

DDI(Q)

I

DDA(Q)

Current B, Quiescent
Input Supply Current, 2 Mbps I
Output Supply Current A or Output Supply

DDI(2)

I

DDA(2)

Current B, 2 Mbps
Input Currents IIA, IIB, I
Logic High Input Threshold VIH 0.7 × V
Logic Low Input Threshold VIL 0.3 × V
Logic High Output Voltages V

Logic Low Output Voltages V
Undervoltage Lockout, V

DDA

or V

Supply

DDB

Positive-Going Threshold V

Negative-Going Threshold V

Hysteresis V
Output Short-Circuit Pulsed Current1 I

OAH,VOBH

OAL,VOBL

DDBUV+

DDBUV-

DDBUVH

OA(SC)

SWITCHING SPECIFICATIONS

Minimum Pulse Width2 PW 100 ns CL = 1000 pF
Maximum Switching Frequency3 2 Mbps CL = 1000 pF
Propagation Delay4 t

PHL

, t

Change vs. Temperature 130 ps/°C CL = 1000 pF
Pulse Width Distortion, |t
Channel-to-Channel Matching,

Rising or Falling Edges
Channel-to-Channel Matching,

Rising vs. Falling Edges

PLH

5

− t

| PWD 14 ns CL = 1000 pF

PHL

11 ns C

6

25 ns C

Part-to-Part Matching, Rising or Falling Edges7 55 ns CL = 1000 pF, input tr = 3 ns
Part-to-Part Matching, Rising vs. Falling Edges8 63 ns CL = 1000 pF, input tr = 3 ns
Output Rise/Fall Time (10% to 90%) tR/tF 8 14 30 ns CL = 1000 pF

1

Short-circuit duration less than 1 second. Average power must conform to the limit shown under the . Absolute Maximum Ratings

2

The minimum pulse width is the shortest pulse width at which the specified timing parameters are guaranteed.

3

The maximum switching frequency is the maximum signal frequency at which the specified timing parameters are guaranteed.

4

t

propagation delay is measured from the 50% level of the falling edge of the VIx signal to the 50% level of the falling edge of the VOx signal. t

PHL

measured from the 50% level of the rising edge of the V

5

Channel-to-channel matching, rising, or falling edges, is the magnitude of the propagation delay difference between two channels of the same part when the inputs

are either both rising or falling edges. The supply voltages and the loads on each channel are equal.

6

Channel-to-channel matching, rising vs. falling edges is the magnitude of the propagation delay difference between two channels of the same part when one input is

a rising edge and the other input is a falling edge. The supply voltages and loads on each channel are equal.

7

Part-to-part matching, rising or falling edges, is the magnitude of the propagation delay difference between the same channels of two different parts when the inputs

are either both rising or falling edges. The supply voltages, temperatures, and loads of each part are equal.

8

Part-to-part matching, rising vs. falling edges, is the magnitude of the propagation delay difference between the same channels of two different parts when one input

is a rising edge and the other input is a falling edge. The supply voltages, temperatures, and loads of each part are equal.

signal to the 50% level of the rising edge of the VOx signal.

Ix

≤ 5.5 V, 12 V ≤ V

DD1

≤ 18 V, 12 V ≤ V

DDA

≤ 18 V. All minimum/maximum

DDB

1.0 2.2 mA
, I

1.5 3.2 mA

DDB(Q)

1.4 3.0 mA
, I

22 30 mA CL = 1000 pF

DDB(2)

DISABLE

−10 +0.01 +10 μA 0 ≤ VIA, VIB, V
V

DD1

V

DD1

V
V

DDA

DDB

− 0.15,

− 0.15

, V

V

DDA

V IOA, IOB = −20 mA

DDB

0.15 V IOA, IOB = 20 mA

8.0 8.9 9.8

7.4 8.2 9.0

0.3 0.7

, I

2.0 4.0 A

OB(SC)

130 160 200 ns CL = 1000 pF

PLH

= 1000 pF

L

= 1000 pF

L

= 25°C,

A

≤ V

DISABLE

propagation delay is

PLH

DD1

Rev. A | Page 3 of 12

ADuM7234

PACKAGE CHARACTERISTICS

Table 2.

Parameter Symbol Min Typ Max Unit Test Conditions

Resistance (Input-to-Output)1 R
Capacitance (Input-to-Output)1 C
Input Capacitance CI 4.0 pF
IC Junction-to-Ambient Thermal Resistance θJA 76 °C/W

1

The device is considered a 2-terminal device: Pin 1 through Pin 8 are shorted together, and Pin 9 through Pin 16 are shorted together.

INSULATION AND SAFETY-RELATED SPECIFICATIONS

Table 3.

Parameter Symbol Value Unit Conditions

Rated Dielectric Insulation Voltage 1000 V rms 1 minute duration
Minimum External Air Gap (Clearance) L(I01) 4.0 min mm

Minimum External Tracking (Creepage) L(I02) 4.0 min mm

Minimum Internal Gap (Internal Clearance) 0.025 min mm Insulation distance through insulation
Tracking Resistance (Comparative Tracking Index) CTI >600 V DIN IEC 112/VDE 0303 Part 1
Isolation Group I Material Group (DIN VDE 0110, 1/89, Table 1)
Maximum Working Voltage Compatible with

50 Years Service Life

V

IORM

1012 Ω

I-O

2.0 pF f = 1 MHz

I-O

Measured from input terminals to output terminals,
shortest distance through air

Measured from input terminals to output terminals,
shortest distance path along body

354 V peak

Continuous peak voltage across the isolation
barrier

RECOMMENDED OPERATING CONDITIONS

Table 4.

Parameter Symbol Min Max Unit

Operating Temperature TA −40 +105 °C
Input Supply Voltage1 V
Output Supply Voltages1 V

4.5 5.5 V

DD1

, V

12 18 V

DDA

DDB

Input Signal Rise and Fall Times 100 ns
Common-Mode Transient Immunity, Input-to-Output2 −35 +35 kV/μs
Common-Mode Transient Immunity, Between Outputs2 −35 +35 kV/μs
Transient Immunity, Supply Voltages2 −35 +35 kV/μs

1

All voltages are relative to their respective ground.

2

See the Common-Mode Transient Immunity section for additional data.

REGULATORY INFORMATION

The ADuM7234 is approved by the organization listed in Tabl e 5.

Table 5.

UL (Pending)

Recognized under 1577 component recognition program1
Single/basic insulation, 1000 V rms isolation voltage
File E214100

1

In accordance with UL 1577, each ADuM7234 is proof tested by applying an insulation test voltage of 1200 V rms for 1 sec (current leakage detection limit = 5 μA).

Rev. A | Page 4 of 12

ADuM7234

ABSOLUTE MAXIMUM RATINGS

Table 6.

Parameter Rating

Storage Temperature (TST) −55°C to +150°C
Ambient Operating Temperature (TA) −40°C to +105°C
Input Supply Voltage (V
Output Supply Voltage1 (V
Input Voltage1 (VIA, VIB) −0.5 V to V

)1 −0.5 V to +7.0 V

DD1

, V

) −0.5 V to +27 V

DDA

DDB

+ 0.5 V

DDI

Output Voltage1

VOA −0.5 V to V
VOB −0.5 V to V

DDA

DDB

+ 0.5 V

+ 0.5 V
Input-to-Output Voltage2 −350 V peak to +350 V peak
Output Differential Voltage3 350 V peak
Output DC Current (IOA, IOB) −800 mA to +800 mA
Common-Mode Transients4 −100 kV/μs to +100 kV/μs

1

All voltages are relative to their respective ground.

2

Input-to-output voltage is defined as GNDA − GND1 or GNDB − GND1.

3

Output differential voltage is defined as GNDA − GNDB.

4

Refers to common-mode transients across any insulation barrier.

Common-mode transients exceeding the absolute maximum ratings
may cause latch-up or permanent damage.

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 listed in the operational sections
of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

Ambient temperature = 25°C, unless otherwise noted.

ESD CAUTION

Rev. A | Page 5 of 12

ADuM7234

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

1

NC

V

2

IA

V

3

IB

ADuM7234

4

V

DD1

GND

DISABLE

V

DD1

NC

TOP VIEW

(Not to Scale)

5

1

6

7

8

NC = NO CONNECT

Figure 2. Pin Configuration

16

V

DDA

V

15

OA

GND

14

A

13

NC

NC

12

V

11

DDB

10

V

OB

GND

9

B

07990-002

Table 7. ADuM7234 Pin Function Descriptions

Pin No. Mnemonic Description

1, 8, 12 13 NC No Connect. Pin 12 and Pin 13 are floating and should be left unconnected.
2 V
3 V
4, 7 V

IA

IB

DD1

Logic Input A.
Logic Input B.
Input Supply Voltage, 4.5 V to 5.5 V. Pin 4 and Pin 7 are internally connected. Connecting both pins to V

recommended.

5 GND

1

Ground Reference for Input Logic Signals.
6 DISABLE Input Disable. Disables the isolator inputs and refresh circuits. Outputs take on the default low state.
9 GND

B

Ground Reference for Output B.
10 VOB Output B.
11 V

Output B Supply Voltage, 12 V to 18 V.

DDB

14 GNDA Ground Reference for Output A.
15 VOA Output A.
16 V

Output A Supply Voltage, 12 V to 18 V.

DDA

DD1

is

Table 8. Truth Table (Positive Logic)

VIA/VIB Input V

State DISABLE VOA/VOB Output Notes

DD1

H Powered L H
L Powered L L
X Unpowered X L Output returns to the input state within 1 μs of V
X Powered H L

power restoration.

DD1

Rev. A | Page 6 of 12

ADuM7234

TYPICAL PERFORMANCE CHARACTERISTICS

1.2

166

1.0

0.8

0.6

0.4

INPUT CURRENT (mA)

0.2

0

0 0. 5 1.0 1.5 2.0

DATA RATE (Mbps)

Figure 3. Typical Input Supply Current Variation with Data Rate

25

20

15

10

OUTPUT CURRENT (mA)

5

164

CHANNEL A FALL

162

160

158

156

PROPAGATI ON DELAY (n s)

154

152

4.5 5. 0 5.5

07990-012

CHANNEL A RISE

INPUT SUPPLY VOLTAGE (V)

CHANNEL B FALL

CHANNEL B RISE

07990-015

Figure 6. Typical Propagation Delay Variation with Input Supply Voltage

(Output Supply Voltage = 15.0 V)

166

164

162

160

158

156

PROPAGATI ON DELAY (n s)

154

CHANNEL A FALL

CHANNEL B FALL

CHANNEL A RISE

CHANNEL B RISE

0

0 0.5 1.0 1.5 2.0

DATA RATE (Mbps)

Figure 4. Typical Output Supply Current Variation with Data Rate

160

155

150

145

PROPAGATI ON DELAY (n s)

140

–40 –20 0 20406080100120

TEMPERATURE ( °C)

Figure 5. Typical Propagation Delay Variation with Temperature

152

12 15 18

07990-013

OUTPUT SUPPLY VOLTAGE (V)

07990-016

Figure 7. Typical Propagation Delay Variation with Output Supply Voltage

(Input Supply Voltage = 5.0 V)

07990-014

Rev. A | Page 7 of 12

ADuM7234

APPLICATIONS INFORMATION

COMMON-MODE TRANSIENT IMMUNITY

In general, common-mode transients consist of linear and
sinusoidal components. The linear component of a common­mode transient is given by

V

where ΔV/Δt is the slope of the transient shown in Figure 11
and Figure 12.

The transient of the linear component is given by

dV

Figure 8 characterizes the ability of the ADuM7234 to operate
correctly in the presence of linear transients. The data, based on
design simulation, is the maximum linear transient magnitude
that the ADuM7234 can tolerate without an operational error.
This data shows a correlation with the data that is listed in
Tabl e 4, which is based on measured data.

The sinusoidal component (at a given frequency) is given by

V

where:

V

is the magnitude of the sinusoidal.

0

f is the frequency of the sinusoidal.

The transient magnitude of the sinusoidal component is given by

dV

= (ΔV/Δt)t

CM, linear

/dt = ΔV/Δt

CM

50

45

40

35

30

25

20

15

10

TRANSIENT IMMUNITY (kV/µs)

5

0

BEST-CASE PROCESS VARIATION
WORST-CASE PROCESS VARIATION

100–40 0 40 80–20 20 60

TEMPERATURE (°C)

Figure 8. Transient Immunity (Linear Transients) vs. Temperature

CM, sinusoidal

= V0sin(2πft)

/dt = 2πf V0

CM

07990-003

Figure 9 and Figure 10 characterize the ability of the ADuM7234
to operate correctly in the presence of sinusoidal transients.
The data is based on design simulation and is the maximum
sinusoidal transient magnitude (2πf V

) that the ADuM7234

0

can tolerate without an operational error. Values for immunity
against sinusoidal transients are not included in Ta bl e 4 because
measurements to obtain such values have not been possible.

250

200

150

100

50

TRANSIENT IM MUNITY (kV/µs)

0

Figure 9. Transient Immunity (Sinusoidal Transients),

250

200

150

100

TRANSIENT I MMUNITY (kV/µs)

50

0

Figure 10. Transient Immunity (Sinusoidal Transients),

BEST-CASE PROCESS VARIATION
WORST-CASE PROCESS VARIATION

FREQUENCY (MHz)

27°C Ambient Temperature

BEST-CASE PROCESS VARIATION
WORST-CASE PROCESS VARIATION

FREQUENCY ( MHz)

100°C Ambient Temperature

20000 500 1000 1500 1750250 750 1250

07990-004

20000 500 1000 1500 1750250 750 1250

07990-005

Rev. A | Page 8 of 12

ADuM7234

V

V

5V

V

AND V

AND GND

A

GND

DDB

DD1

1

15V

B

ΔV

Δt

15V

V

GND

DDA

AND GND

A

AND V

V

GND

DDB

DD1

15V

V

DDA

GND

ΔV

15V

B

1

Δt

5V

Figure 11. Common-Mode Transient Immunity Waveforms, Input to Output

15V

B

15V

A

ΔV

Δt

15V

07990-007

V

DDA/VDDB

GND

/GND

A

V

DDB/VDDA

GNDA/GND

V

15V

ΔV

15V

B

B

Δt

15V

DDA/VDDB

GND

V

DDB/VDDA

GND

A

B

/GND

/GND

Figure 12. Common-Mode Transient Immunity Waveforms,

Between Outputs

DDA/VDDB

ΔV

DDA/VDDB

GNDA/GND

B

DD

Δt

GNDA/GND

B

07990-008

Figure 13. Transient Immunity Waveforms, Output Supplies

INSULATION LIFETIME

All insulation structures eventually break down when subjected to
voltage stress over a sufficiently long period. The rate of insulation
degradation depends on the characteristics of the voltage waveform
applied across the insulation. In addition to the testing performed
by the regulatory agencies, Analog Devices conducts an extensive
set of evaluations to determine the lifetime of the insulation struc­ture within the ADuM7234.

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. Tab l e 3 lists the peak voltage for 50
years of service life for a bipolar ac operating condition and the
maximum Analog Devices recommended working voltage. In
many cases, the approved working voltage is higher than the 50­year service life voltage. Operation at these high working
voltages can lead to shortened insulation life in some cases.

07990-006

The insulation lifetime of the ADuM7234 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 14, Figure 15, and Figure 16 illustrate these
different isolation voltage waveforms.

Bipolar ac voltage is the most stringent environment. The goal
of a 50-year operating lifetime under the ac bipolar condition
determines the maximum working voltage recommended by
Analog Devices.

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 voltage listed in Tab l e 3 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 15
or Figure 16 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 3 . Note that the voltage presented in Figure 15
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

07990-009

Figure 14. Bipolar AC Waveform

RATED PEAK VOLTAGE

0V

07990-010

Figure 15. Unipolar AC Waveform

RATED PEAK VOLTAGE

0V

07990-011

Figure 16. DC Waveform

Rev. A | Page 9 of 12

ADuM7234

OUTLINE DIMENSIONS

10.00 (0.3937)

9.80 (0.3858)

4.00 (0.1575)

3.80 (0.1496)

0.25 (0.0098)

0.10 (0.0039)

COPLANARITY

0.10

CONTROLL ING DIMENSIONS ARE IN MILLIMETERS; INCH DI MENSIONS
(IN PARENTHESES) ARE ROUNDED-O FF MIL LIMET ER EQUIVALENTS FOR
REFERENCE ON LY AND ARE NOT APPROPRI ATE FOR USE IN DESIGN.

16

1

1.27 (0.0500)
BSC

0.51 (0.0201)

0.31 (0.0122)

COMPLIANT TO JEDEC STANDARDS MS-012-AC

9

6.20 (0.2441)

5.80 (0.2283)

8

1.75 (0.0689)

1.35 (0.0531)

SEATING
PLANE

8°
0°

0.25 (0.0098)

0.17 (0.0067)

0.50 (0.0197)

0.25 (0.0098)

1.27 (0.0500)

0.40 (0.0157)

45°

060606-A

Figure 17. 16-Lead Standard Small Outline Package [SOIC_N]

Narrow Body (R-16)

Dimensions shown in millimeters and (inches)

ORDERING GUIDE

No. of

Model1

Channels

ADuM7234BRZ 2 4 15 −40°C to +105°C 16-Lead SOIC_N R-16
ADuM7234BRZ-RL7 2 4 15 −40°C to +105°C

1

Z = RoHS Compliant Part.

Output Peak
Current (A)

Output
Voltage (V) Temperature Range Package Description

16-Lead SOIC_N, 7-Inch Tape
and Reel Option (1,000 Units)

Package
Option

R-16

Rev. A | Page 10 of 12

ADuM7234

NOTES

Rev. A | Page 11 of 12

ADuM7234

NOTES

©2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D07990-0-1/10(A)

Rev. A | Page 12 of 12