Datasheet ADM3491 Datasheet (Analog Devices)

3.3 V, Full-Duplex, 840 µA,

FEATURES

Operates with 3.3 V supply
EIA RS-422 and RS-485 compliant over full CM range
19 kΩ input impedance
Up to 50 transceivers on bus
20 Mbps data rate
Short circuit protection
Specified over full temperature range
Thermal shutdown
Interoperable with 5 V logic
840 µA supply current
2 nA shutdown current
Also available in TSSOP package
Meets IEC1000-4-4 (>1 kV)
8 ns skew
Upgrade for MAX 3491, SN75ALS180

APPLICATIONS

Telecommunications
DTE–DCE interface
Packet switching
Local area networks
Data concentration
Data multiplexers
Integrated services digital network (ISDN)
AppleTalk
Industrial controls

GENERAL DESCRIPTION

The ADM3491 is a low power, differential line transceiver
designed to operate using a single 3.3 V power supply. Low
power consumption, coupled with a shutdown mode, makes it
ideal for power-sensitive applications. It is suitable for commu­nication on multipoint bus transmission lines.

20 Mbps, EIA RS-485 Transceiver

ADM3491

FUNCTIONAL BLOCK DIAGRAM

ADM3491

RO

RE

DE

DI

R

D

Figure 1.

The ADM3491 is intended for balanced data transmission and
complies with both EIA Standards RS-485 and RS-422. It
contains a differential line driver and a differential line receiver,
making it suitable for full-duplex data transfer.

The input impedance is 19 kΩ, allowing up to 50 transceivers to
be connected on the bus. Excessive power dissipation caused by
bus contention or by output shorting is prevented by a thermal
shutdown circuit. This feature forces the driver output into a
high impedance state, if a significant temperature increase is
detected in the internal driver circuitry during fault conditions.

The receiver contains a fail-safe feature that results in a logic
high output state, if the inputs are unconnected (floating).

The ADM3491 is fabricated on BiCMOS, an advanced mixed
technology process combining low power CMOS with fast
switching bipolar technology.

The ADM3491 is fully specified over the industrial temperature
range and is available in DIP and SOIC packages, as well as the
space-saving TSSOP package.

A

B

Z

Y

05234-001

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
Fax: [phone] © 2004 Analog Devices, Inc. All rights reserved.

www.analog.com

ADM3491

TABLE OF CONTENTS

Specifications..................................................................................... 3

Typical Perfor m a n c e Character i stics ..............................................9

Timing Specifications .................................................................. 4

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

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

Pin Configurations and Function Descriptions ........................... 6

Tes t Ci rc u it s ....................................................................................... 7

Switching Characteristics ................................................................ 8

REVISION HISTORY

11/04—Rev. 0 to Rev. A

Format Updated ..................................................................Universal

Changes to Specifications Section.................................................. 3

Changes to Ordering Guide.......................................................... 13

1/98—Revision 0: Initial Version

Applications Information .............................................................. 11

Differential Data Transmission ................................................ 11

Cable and Data Rate................................................................... 11

Receiver Open-Circuit Fail-Safe Feature ................................ 11

Outline Dimensions....................................................................... 12

Ordering Guide .......................................................................... 13

Rev. A | Page 2 of 16

ADM3491

SPECIFICATIONS

VCC = 3.3 V ± 0.3 V. All specifications T

Table 1.

Parameter Min Typ Max Unit Test Conditions/Comments

DRIVER

Differential Output Voltage, VOD 2.0 V RL = 100 Ω, Figure 4, VCC > 3.1 V

1.5 V RL = 54 Ω, Figure 4

1.5 V RL = 60 Ω, Figure 5, −7 V < V
∆|VOD| for Complementary Output States 0.2 V R = 54 Ω or 100 Ω, Figure 4
Common-Mode Output Voltage, VOC 3 V R = 54 Ω or 100 Ω, Figure 4
∆|VOC| for Complementary Output States 0.2 V R = 54 Ω or 100 Ω, Figure 4
CMOS Input Logic Threshold Low, V
CMOS Input Logic Threshold High, V
Logic Input Current (DE, DI, RE)

Output Leakage (Y, Z) Current ±3 µA VO = –7 V or +12 V, VCC = 0 V or 3.6 V
Output Short-Circuit Current ±250 mA VO = –7 V or +12 V

RECEIVER

Differential Input Threshold Voltage, VTH −0.2 +0.2 V −7 V < VCM < +12 V
Input Voltage Hysteresis, ∆VTH 50 mV VCM = 0 V
Input Resistance 12 19 kΩ −7 V < VCM < +12 V
Input Current (A, B) 1 mA VIN = 12 V

−0.8 mA VIN = −7 V
Logic Enable Input Current (RE)
Output Voltage Low, VOL 0.4 V I
Output Voltage High, VOH VCC – 0.4 V V I
Short-Circuit Output Current ±60 mA V
Three-State Output Leakage Current ±1.0 µA VCC = 3.6 V, 0 V < V

POWER SUPPLY CURRENT

ICC Outputs unloaded

0.84 1.5 mA

0.84 1.5 mA
Supply Current in Shutdown 0.002 1 µA

to T

MIN

0.8 V

INL

2.0 V

INH

, unless otherwise noted.

MAX

±1.0 µA

±1 µA

= 2.5 mA

OUT

= −1.5 mA

OUT

= GND or VCC

OUT

DE = V

CC

DE = 0 V,
DE = 0 V,

, RE = 0 V

RE = 0 V
RE = VCC

OUT

< VCC

< +12 V

TST

Rev. A | Page 3 of 16

ADM3491

TIMING SPECIFICATIONS

VCC = 3.3 V, TA = 25°C.

Table 2.

Parameter Min Typ Max Unit Test Conditions/ Comments

DRIVER

Differential Output Delay, T

DD

Differential Output Transition Time 1 8 15 ns RL = 60 Ω, CL1 = C

Propagation Delay Input to Output, T

Driver Output to Output, T

SKEW

PLH

, T

PHL

ENABLE/DISABLE

Driver Enable to Output Valid

Driver Disable Timing

Driver Enable from Shutdown
RECEIVER

Time to Shutdown 80 190 300 ns

Propagation Delay Input to Output, T

Skew, T

Receiver Enable, T

Receiver Disable, T

PLH

– T

PHL

EN

DEN

PLH

, T

PHL

Receiver Enable from Shutdown

1

35 ns RL = 60 Ω, CL1 = C

7 22 35 ns RL = 27 Ω, CL1 = C

8 ns R

= 54 Ω, CL1 = C

L

45 90 ns RL = 110 Ω, C
40 80 ns RL = 110 Ω, C
650 110 ns RL = 110 Ω, C

= 50 pF, Figure 6

L

= 50 pF, Figure 6

L

= 15 pF, Figure 6

L

25 65 90 ns C

25 50 ns C
25 45 ns C

10 ns C

500 ns C

= 15 pF, Figure 11

L

= 15 pF, Figure 11

L

= 15 pF, Figure 7

L

= 15 pF, Figure 7

L

= 15 pF, Figure 7

L

= 15 pF, Figure 8

L2

= 15 pF, Figure 8

L2

= 15 pF, Figure 9

L2

= 15 pF, Figure 9

L2

= 3.3 V ± 0.3 V, TA = T

V

CC

MIN

to T

MAX

.

Table 3.

Parameter Min Typ Max Unit Test Conditions/ Comments

DRIVER

Differential Output Delay, T

DD

Differential Output Transition Time 2 8 15 ns RL = 60 Ω, CL1 = C

Propagation Delay Input to Output, T

Driver Output to Output, T

SKEW

PLH

, T

PHL

ENABLE/DISABLE

Driver Enable to Output Valid

Driver Disable Timing

Driver Enable from Shutdown
RECEIVER

Time to Shutdown 50 190 500 ns

Propagation Delay Input to Output, T

Skew, T

Receiver Enable, T

Receiver Disable, T

PLH

– T

PHL

EN

DEN

PLH

, T

PHL

Receiver Enable from Shutdown

1

70 ns RL = 60 Ω, CL1 = C

7 22 70 ns RL = 27 Ω, CL1 = C

10 ns R

= 54 Ω, CL1 = C

L

45 110 ns RL = 110 Ω, C
40 110 ns RL = 110 Ω, C
650 110 ns RL = 110 Ω, C

= 50 pF, Figure 6

L

= 50 pF, Figure 6

L

= 15 pF, Figure 6

L

25 65 115 ns C

25 50 ns C
25 50 ns C

20 ns C

600 ns C

= 15 pF, Figure 11

L

= 15 pF, Figure 11

L

= 15 pF, Figure 7

L

= 15 pF, Figure 7

L

= 15 pF, Figure 7

L

= 15 pF, Figure 8

L2

= 15 pF, Figure 8

L2

= 15 pF, Figure 9

L2

= 15 pF, Figure 9

L2

Rev. A | Page 4 of 16

ADM3491

ABSOLUTE MAXIMUM RATINGS

TA = 25°C, unless otherwise noted.

Table 4.

Parameter Min

V

CC

Inputs

Driver Input (DI) −0.3 V to VCC + 0.3 V
Control Inputs (DE, RE)
Receiver Inputs (A, B) −7.5 V to +12.5 V

Outputs

Driver Outputs −7.5 V to +12.5 V
Receiver Output −0.5 V to VCC + 0.5 V

14-Lead DIP, Power Dissipation 800 mW

θJA, Thermal Impedance 140°C/W

14-Lead SOIC, Power Dissipation 650 mW

θJA, Thermal Impedance 115°C/W

16-Lead TSSOP, Power Dissipation 500 mW

θJA, Thermal Impedance 158°C/W

Operating Temperature Range

Industrial (A Version) −40°C to +85°C
Storage Temperature Range −65°C to +150°C
Lead Temperature (Soldering, 10 s) 300°C
Vapor Phase (60 s) 215°C
Infrared (15 s) 220°C
ESD Rating >2 kV
EFT Rating (IEC1000-4-4) >1 kV

7 V

−0.3 V to V

+ 0.3 V

CC

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and 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.

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.

Rev. A | Page 5 of 16

ADM3491

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

NC 1
RO 2
RE 3

ADM3491

TOP VIEW

DE 4

(Not to Scale)

DI 5 Z10

6

GND

7

GND

NC = NO CONNECT

V

14

CC

V

13

CC

A12
B11

9

Y

8

NC

05234-002

Figure 2. DIP/SOIC Pin Configuration

1

V

CC

2

NC

3

RO
RE
DE

NC

GND NC

ADM3491

TOP VIEW

4

(Not to Scale)

5

6

DI

7

8

NC = NO CONNECT

Figure 3. TSSOP Pin Configuration

16

NC

15

A

14

B

13

NC

12

Z

11

Y

10

NC

9

05234-003

Table 5. Pin Function Descriptions

Pin Number

DIP/ SOIC TSSOP

Mnemonic Description

1, 8 2, 7, 9, 10, 13, 16 NC No Connect.

2 3 RO Receiver Output. High when A > B by 200 mV; low when A < B by 200 mV.

3 4

4 5 DE

RE Receiver Output Enable. When RE is low, the receiver output RO is enabled. When RE is high, the

output is high impedance. If

RE is high and DE is low, the ADM3491 enters a shutdown state.

Driver Output Enable. A high level enables the driver differential outputs, Y and Z. A low level
places the part in a high impedance state.

5 6 DI

Driver Input. When the driver is enabled, a logic low on DI forces Y low and Z high; a logic high
on DI forces Y high and Z low.

6, 7 8 GND Ground Connection, 0 V.
9 11 Y Noninverting Driver Output Y.
10 12 Z Inverting Driver Output Z.
11 14 B Inverting Receiver Input B.
12 15 A Noninverting Receiver Input A.
13, 14 1 VCC Power Supply, 3.3 V ± 0.3 V.

Rev. A | Page 6 of 16

ADM3491

V

–

TEST CIRCUITS

375Ω

R/2

V

OD

CC

R/2

V

OC

05234-004

Figure 4. Driver Voltage Measurement Test Circuit

V

CC

R

L

0V OR 3V

DE IN

DE

S1

C

V

L

OUT

S2

05234-005

Figure 5. Driver Enable/Disable Test Circuit

C

DI

RL

D

DIFF

L1

V

OUT

C

L2

05234-006

Figure 6. Driver Differential Output Delay Test Circuit

A

C

DI

RL

DIFF

L1

B

C

L2

RO

RD

RE

05234-007

Figure 7. Driver/Receiver Propagation Delay Test Circuit

V

OD3

375Ω

TST

L

05234-008

V

R

Figure 8. Driver Voltage Measurement Test Circuit 2

V

+1.5V

S1

1.5V

RE IN

RE

CC

R

L

L

OUT

S2

05234-009

C
V

Figure 9. Receiver Enable/Disable Test Circuit

V

OM

R

L

S1

DE

IN

V

CC

V

C

OUT

L

05234-010

Figure 10. Driver Propagation Delay Test Circuit

3V

0V

V

ID

1.5V

RE

V

OUT

C

L

05234-011

Figure 11. Receiver Propagation Delay Test Circuit

Rev. A | Page 7 of 16

ADM3491

–

SWITCHING CHARACTERISTICS

3V

0V

Z

VO

Y

VO
0V
VO

1/2VO

90% POINT

10% POINT

t

1.5V

PLH

t

SKEW

t

R

1.5V

Figure 12. Driver Propagation Delay, Rise/Fall Timing

t

PLH

0V

t

PHL

1.5V

A–B

RO

Figure 13. Receiver Propagation Delay

3V

t

PHL

t

SKEW

90% POINT

10% POINT

t

F

05234-012

RE

0V

1.5V

t

ZL

R

R

1.5V

t

ZH

1.5V

O/P

LOW

O/P HIGH

t

1.5V

LZ

t

HZ

0V

+ 0.25V

V

OL

VOH– 0.25V

V

OL

V

OH

05234-014

Figure 14. Driver Enable/Disable Timing

3V

t

LZ

t

1.5V

HZ

0V

+ 0.25V

V

OL

VOH– 0.25V

V

OL

V

OH

05234-015

RE

0V

R

V

OH

1.5V

V

05234-013

OL

R

0V

1.5V

t

ZL

t

ZH

1.5V

1.5V

O/P

LOW

O/P HIGH

Figure 15. Receiver Enable/Disable Timing

Rev. A | Page 8 of 16

ADM3491

TYPICAL PERFORMANCE CHARACTERISTICS

14

14

12

10

8

6

4

OUTPUT CURRENT (mA)

2

0

0 3.50.5 1 1.5 2 2.5 3

OUTPUT VOLTAGE (V)

Figure 16. Receiver Output Low Voltage vs. Output Current

0.8

0.7

0.6

0.5

0.4

0.3

OUTPUT VOLTAGE (V)

0.2

0.1

0
–40 100–20 0 20 40 60 80

IRO = 2.5mA

TEMPERATURE (°C)

Figure 17. Receiver Output Low Voltage vs. Temperature

120

100

80

60

40

OUTPUT CURRENT (mA)

20

0

0 0.5 1 1.5 2 2.5 3

DIFFERENTIAL O/P VOLTAGE (V)

Figure 18. Driver Differential Output Voltage vs. Output Current

05234-016

05234-017

05234-018

12

10

8

6

4

OUTPUT CURRENT (mA)

2

0

040.5 1 1.5 2 2.5 3 3.5
OUTPUT HIGH VOLTAGE (V)

Figure 19. Receiver Output High Voltage vs. Output Current

3.3

3.25

3.2

3.15

3.1

OUTPUT VOLTAGE (V)

3.05

3

–40 100–20 0 20 40 60 80

IRO = –1.5mA

TEMPERATURE (°C)

Figure 20. Receiver Output High Voltage vs. Temperature

2.6

2.5

2.4

2.3

2.2

2.1

2.0

1.9

OUTPUT VOLTAGE (V)

1.8

1.7

1.6
–40 100–20 0 20 40 60 80

TEMPERATURE (°C)

Figure 21. Driver Differential Output Voltage vs. Temperature

05234-019

05234-020

05234-021

Rev. A | Page 9 of 16

ADM3491

1.2

[ T ]

1.1

1

0.9

SUPPLY CURRENT (mA)

0.8

0.7
–40 100–20 0 20 40 60 80

TEMPERATURE (°C)

Figure 22. Supply Current vs. Temperature

[ T ]

T

3

T

T
1
2

T

4

CH1 1.00V CH2 1.00V M40.0ns CH3 640mV
CH3 2.00V CH4 2.00V

100FT
CABLE

Figure 23. Driving 100 ft. Cable L-H Transition

05234-022

05234-023

T

3

1
2

4

T

T

T

CH1 1.00V CH2 1.00V M40.0ns CH3 640mV

CH3 2.00V CH4 2.00V

100FT CAT 5
CABLE

05234-024

Figure 24. Driving 100 ft. Cable H-L Transition

100

90

80

70

60

50

40

30

SHUTDOWN CURRENT (mA)

20

10

0

–40 80–20 0 20 40 60

TEMPERATURE (°C)

05234-025

Figure 25. Shutdown Current vs. Temperature

Rev. A | Page 10 of 16

ADM3491

APPLICATIONS INFORMATION

DIFFERENTIAL DATA TRANSMISSION

Differential data transmission is used to reliably transmit data at
high rates over long distances and through noisy environments.
Differential transmission nullifies the effects of ground shifts
and noise signals, which appear as common-mode voltages on
the line.

The two main standards approved by the Electronics Industries
Association (EIA) specify the electrical characteristics of
transceivers used in differential data transmission:

• RS-422 standard specifies data rates up to 10 MBaud and

line lengths up to 4000 ft. A single driver can drive a
transmission line with up to 10 receivers.

• RS-485 standard was defined to cater to true multipoint

communications. This standard meets or exceeds all the
requirements of RS-422, but also allows multiple drivers and
receivers to be connected to a single bus. An extended
common-mode range of −7 V to +12 V is defined.

The most significant differentiator of the RS-485 standard is
that the drivers can be disabled, thereby allowing more than one
to be connected to a single line. Only one driver should be
enabled at a time, but the RS-485 standard contains additional
specifications to guarantee device safety in the event of line
contention.

Table 6. Comparison of RS-422 and RS-485 Interface
Standards

Specification RS-422 RS-485

Transmission Type Differential Differential

Maximum Cable Length 4000 ft. 4000 ft.
Minimum Driver Output Voltage ±2 V ±1.5 V
Driver Load Impedance 100 Ω 54 Ω
Receiver Input Resistance 4 kΩ min 12 kΩ min
Receiver Input Sensitivity ±200 mV ±200 mV
Receiver Input Voltage Range −7 V to +7 V −7 V to +12 V

CABLE AND DATA RATE

The transmission line of choice for RS-485 communications is a
twisted pair. Twisted pair cable tends to cancel common-mode
noise and also causes cancellation of the magnetic fields gener­ated by the current flowing through each wire, thereby reducing
the effective inductance of the pair.

The ADM3491 is designed for bidirectional data communica­tions on multipoint transmission lines. A typical application
showing a multipoint transmission network is illustrated in
Figure 26. Only one driver can transmit at a particular time, but
multiple receivers can be enabled simultaneously.

As with any transmission line, it is important that reflections be
minimized. This can be achieved by terminating the extreme
ends of the line using resistors equal to the characteristic
impedance of the line. Stub lengths of the main line should also
be kept as short as possible. A properly terminated transmission
line appears purely resistive to the driver.

RECEIVER OPEN-CIRCUIT FAIL-SAFE FEATURE

The receiver input includes a fail-safe feature that guarantees a
logic high on the receiver when the inputs are open circuit or
floating.

3.3V

0.1µF

V

CC

RE

RO

ADM3491

DI

DE

A

R

B

RS-485/RS-422 LINK

Z

D

Y

GND

Figure 26. ADM3491 Full-Duplex Data Link

Table 7. Transmitting Truth Table

Transmitting

Inputs Outputs

RE

DE DI Z Y

X 1 1 0 1
X 1 0 1 0
0 0 X Hi-Z Hi-Z
1 0 X Hi-Z Hi-Z

Table 8. Receiving Truth Table

Receiving

Inputs Outputs

RE

DE A–B RO

0 X > +0.2 V 0
0 X < −0.2 V 0
0 X Inputs O/C 1
1 X X Hi-Z

3.3V

V

Y

Z

ADM3491

B

A

GND

0.1µF

DE

CC

DI

D

RO

R

RE

05234-026

Rev. A | Page 11 of 16

ADM3491

Y

OUTLINE DIMENSIONS

0.685 (17.40)

0.665 (16.89)

0.645 (16.38)

14
1

0.100 (2.54)
BSC

0.015 (0.38)

0.180 (4.57)
MAX

0.150 (3.81)

0.130 (3.30)

0.110 (2.79)

CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN

0.022 (0.56)

0.018 (0.46)

0.014 (0.36)

COMPLIANT TO JEDEC STANDARDS MO-095-AB

0.060 (1.52)

0.050 (1.27)

0.045 (1.14)

8

7

MIN

0.295 (7.49)

0.285 (7.24)

0.275 (6.99)

SEATING
PLANE

0.325 (8.26)

0.310 (7.87)

0.300 (7.62)

0.015 (0.38)

0.010 (0.25)

0.008 (0.20)

0.150 (3.81)

0.135 (3.43)

0.120 (3.05)

Figure 27. 14-Lead Plastic DIP

(N-14)

Dimensions shown in inches and (millimeters)

8.75 (0.3445)

8.55 (0.3366)

4.00 (0.1575)

3.80 (0.1496)

0.25 (0.0098)

0.10 (0.0039)

COPLANARIT

0.10

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

14
1

1.27 (0.0500)
BSC

0.51 (0.0201)

0.31 (0.0122)

COMPLIANT TO JEDEC STANDARDS MS-012AB

8

6.20 (0.2441)

7

5.80 (0.2283)

1.75 (0.0689)

1.35 (0.0531)

SEATING
PLANE

0.25 (0.0098)

0.17 (0.0067)

0.50 (0.0197)

0.25 (0.0098)

8°
0°

1.27 (0.0500)

0.40 (0.0157)

Figure 28. 14-Lead Narrow Body Small Outline (SOIC)

(R-14)

Dimensions shown in inches and (millimeters)

× 45°

Rev. A | Page 12 of 16

ADM3491

5.10

5.00

4.90

0.15

0.05

4.50

4.40

4.30

PIN 1

16

0.65

BSC

COPLANARITY

COMPLIANT TO JEDEC STANDARDS MO-153AB

0.10

0.30

0.19

9

81

1.20
MAX

SEATING
PLANE

6.40
BSC

0.20

0.09
8°

0°

0.75

0.60

0.45

Figure 29. 16-Lead Thin Shrink Small Outline (TSSOP)

(RU-16)

Dimensions shown in inches and (millimeters)

ORDERING GUIDE

Model Temperature Range Package Description Package Options

ADM3491AN −40°C to +85°C 14-Lead Plastic DIP N-14
ADM3491AR −40°C to +85°C 14-Lead Narrow Body Small Outline (SOIC) R-14
ADM3491AR-REEL −40°C to +85°C 14-Lead Narrow Body Small Outline (SOIC) R-14
ADM3491AR-REEL7 −40°C to +85°C 14-Lead Narrow Body Small Outline (SOIC) R-14
ADM3491ARZ
ADM3491ARZ-REEL1 −40°C to +85°C 14-Lead Narrow Body Small Outline (SOIC) R-14
ADM3491ARZ-REEL71 −40°C to +85°C 14-Lead Narrow Body Small Outline (SOIC) R-14
ADM3491ARU −40°C to +85°C 16-Lead Thin Shrink Small Outline (TSSOP) RU-16
ADM3491ARU-REEL −40°C to +85°C 16-Lead Thin Shrink Small Outline (TSSOP) RU-16
ADM3491ARU-REEL7 −40°C to +85°C 16-Lead Thin Shrink Small Outline (TSSOP) RU-16
ADM3491ARUZ1 −40°C to +85°C 16-Lead Thin Shrink Small Outline (TSSOP) RU-16
ADM3491ARUZ-REEL1 −40°C to +85°C 16-Lead Thin Shrink Small Outline (TSSOP) RU-16
ADM3491ARUZ-REEL71 −40°C to +85°C 16-Lead Thin Shrink Small Outline (TSSOP) RU-16

1

Z = Pb-free part.

1

−40°C to +85°C 14-Lead Narrow Body Small Outline (SOIC) R-14

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ADM3491

NOTES

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ADM3491

NOTES

Rev. A | Page 15 of 16

ADM3491

NOTES

© 2004 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.

C05234–0–11/04(A)

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