3.3 V, Full-Duplex, 840 µA,
20 Mbps, EIA RS-485 Transceiver
ADM3491
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.
FUNCTIONAL BLOCK DIAGRAM
ADM3491
A
RO
R
B
RE
DE
Z
DI
D
Y
05234-001
FEATURES
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.
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: 781.329.4700
www.analog.com
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
ADM3491
TABLE OF CONTENTS
Specifications..................................................................................... 3
Typical Performance Characteristics ..............................................9
Timing Specifications .................................................................. 4
Applications Information .............................................................. 11
Absolute Maximum Ratings............................................................ 5
Differential Data Transmission ................................................ 11
ESD Caution.................................................................................. 5
Cable and Data Rate................................................................... 11
Pin Configurations and Function Descriptions ........................... 6
Receiver Open-Circuit Fail-Safe Feature ................................ 11
Test Circuits....................................................................................... 7
Outline Dimensions ....................................................................... 12
Switching Characteristics ................................................................ 8
Ordering Guide .......................................................................... 13
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
Rev. A | Page 2 of 16
ADM3491
SPECIFICATIONS
VCC = 3.3 V ± 0.3 V. All specifications TMIN to TMAX, unless otherwise noted.
Table 1.
Parameter
DRIVER
Differential Output Voltage, VOD
∆|VOD| for Complementary Output States
Common-Mode Output Voltage, VOC
∆|VOC| for Complementary Output States
CMOS Input Logic Threshold Low, VINL
CMOS Input Logic Threshold High, VINH
Logic Input Current (DE, DI, RE)
Output Leakage (Y, Z) Current
Output Short-Circuit Current
RECEIVER
Differential Input Threshold Voltage, VTH
Input Voltage Hysteresis, ∆VTH
Input Resistance
Input Current (A, B)
Logic Enable Input Current (RE)
Output Voltage Low, VOL
Output Voltage High, VOH
Short-Circuit Output Current
Three-State Output Leakage Current
POWER SUPPLY CURRENT
ICC
Supply Current in Shutdown
Min
Typ
Max
Unit
Test Conditions/Comments
V
V
V
V
V
V
V
V
µA
µA
mA
RL = 100 Ω, Figure 4, VCC > 3.1 V
RL = 54 Ω, Figure 4
RL = 60 Ω, Figure 5, −7 V < VTST < +12 V
R = 54 Ω or 100 Ω, Figure 4
R = 54 Ω or 100 Ω, Figure 4
R = 54 Ω or 100 Ω, Figure 4
−7 V < VCM < +12 V
VCM = 0 V
−7 V < VCM < +12 V
VIN = 12 V
VIN = −7 V
±60
±1.0
V
mV
kΩ
mA
mA
µA
V
V
mA
µA
1.5
1.5
1
mA
mA
µA
2.0
1.5
1.5
0.2
3
0.2
0.8
2.0
±1.0
±3
±250
−0.2
12
+0.2
50
19
1
−0.8
±1
0.4
VCC – 0.4 V
0.84
0.84
0.002
Rev. A | Page 3 of 16
VO = –7 V or +12 V, VCC = 0 V or 3.6 V
VO = –7 V or +12 V
IOUT = 2.5 mA
IOUT = −1.5 mA
VOUT = GND or VCC
VCC = 3.6 V, 0 V < VOUT < VCC
Outputs unloaded
DE = VCC, RE = 0 V
DE = 0 V, RE = 0 V
DE = 0 V, RE = VCC
ADM3491
TIMING SPECIFICATIONS
VCC = 3.3 V, TA = 25°C.
Table 2.
Parameter
DRIVER
Differential Output Delay, TDD
Differential Output Transition Time
Propagation Delay Input to Output, TPLH, TPHL
Driver Output to Output, TSKEW
ENABLE/DISABLE
Driver Enable to Output Valid
Driver Disable Timing
Driver Enable from Shutdown
RECEIVER
Time to Shutdown
Propagation Delay Input to Output, TPLH, TPHL
Skew, TPLH – TPHL
Receiver Enable, TEN
Receiver Disable, TDEN
Receiver Enable from Shutdown
Min
Typ
Max
Unit
Test Conditions/ Comments
1
1
7
8
22
35
15
35
8
ns
ns
ns
ns
RL = 60 Ω, CL1 = CL2 = 15 pF, Figure 8
RL = 60 Ω, CL1 = CL2 = 15 pF, Figure 8
RL = 27 Ω, CL1 = CL2 = 15 pF, Figure 9
RL = 54 Ω, CL1 = CL2 = 15 pF, Figure 9
45
40
650
90
80
110
ns
ns
ns
RL = 110 Ω, CL = 50 pF, Figure 6
RL = 110 Ω, CL = 50 pF, Figure 6
RL = 110 Ω, CL = 15 pF, Figure 6
190
65
300
90
10
50
45
500
ns
ns
ns
ns
ns
ns
CL = 15 pF, Figure 11
CL = 15 pF, Figure 11
CL = 15 pF, Figure 7
CL = 15 pF, Figure 7
CL = 15 pF, Figure 7
80
25
25
25
VCC = 3.3 V ± 0.3 V, TA = TMIN to TMAX.
Table 3.
Parameter
DRIVER
Differential Output Delay, TDD
Differential Output Transition Time
Propagation Delay Input to Output, TPLH, TPHL
Driver Output to Output, TSKEW
ENABLE/DISABLE
Driver Enable to Output Valid
Driver Disable Timing
Driver Enable from Shutdown
RECEIVER
Time to Shutdown
Propagation Delay Input to Output, TPLH, TPHL
Skew, TPLH – TPHL
Receiver Enable, TEN
Receiver Disable, TDEN
Receiver Enable from Shutdown
Min
Typ
Max
Unit
Test Conditions/ Comments
1
2
7
8
22
70
15
70
10
ns
ns
ns
ns
RL = 60 Ω, CL1 = CL2 = 15 pF, Figure 8
RL = 60 Ω, CL1 = CL2 = 15 pF, Figure 8
RL = 27 Ω, CL1 = CL2 = 15 pF, Figure 9
RL = 54 Ω, CL1 = CL2 = 15 pF, Figure 9
45
40
650
110
110
110
ns
ns
ns
RL = 110 Ω, CL = 50 pF, Figure 6
RL = 110 Ω, CL = 50 pF, Figure 6
RL = 110 Ω, CL = 15 pF, Figure 6
190
65
500
115
20
50
50
600
ns
ns
ns
ns
ns
ns
CL = 15 pF, Figure 11
CL = 15 pF, Figure 11
CL = 15 pF, Figure 7
CL = 15 pF, Figure 7
CL = 15 pF, Figure 7
50
25
25
25
Rev. A | Page 4 of 16
ADM3491
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 4.
Parameter
VCC
Inputs
Driver Input (DI)
Control Inputs (DE, RE)
Receiver Inputs (A, B)
Outputs
Driver Outputs
Receiver Output
14-Lead DIP, Power Dissipation
θJA, Thermal Impedance
14-Lead SOIC, Power Dissipation
θJA, Thermal Impedance
16-Lead TSSOP, Power Dissipation
θJA, Thermal Impedance
Operating Temperature Range
Industrial (A Version)
Storage Temperature Range
Lead Temperature (Soldering, 10 s)
Vapor Phase (60 s)
Infrared (15 s)
ESD Rating
EFT Rating (IEC1000-4-4)
Min
7V
−0.3 V to VCC + 0.3 V
−0.3 V to VCC + 0.3 V
−7.5 V to +12.5 V
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.
−7.5 V to +12.5 V
−0.5 V to VCC + 0.5 V
800 mW
140°C/W
650 mW
115°C/W
500 mW
158°C/W
−40°C to +85°C
−65°C to +150°C
300°C
215°C
220°C
>2 kV
>1 kV
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
VCC 1
NC
16
NC
2
15
A
ADM3491
14
B
TOP VIEW
(Not to Scale)
13
NC
NC 1
14 VCC
RO 3
RO 2
13 VCC
RE
4
DE
5
12
Z
DI
6
11
Y
NC
7
10
NC
GND
8
9
NC
RE 3
ADM3491
12 A
TOP VIEW
11 B
(Not to Scale)
DI 5
10 Z
DE 4
9
GND 7
8
NC = NO CONNECT
Y
NC
05234-002
GND 6
NC = NO CONNECT
Figure 2. DIP/SOIC Pin Configuration
05234-003
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Figure 3. TSSOP Pin Configuration
Table 5. Pin Function Descriptions
Pin Number
DIP/ SOIC
1, 8
TSSOP
2, 7, 9, 10, 13, 16
Mnemonic
NC
Description
No Connect.
2
3
3
4
RO
Receiver Output. High when A > B by 200 mV; low when A < B by 200 mV.
RE
4
5
DE
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
9
10
11
12
13, 14
8
11
12
14
15
1
GND
Y
Z
B
A
VCC
Ground Connection, 0 V.
Noninverting Driver Output Y.
Inverting Driver Output Z.
Inverting Receiver Input B.
Noninverting Receiver Input A.
Power Supply, 3.3 V ± 0.3 V.
Rev. A | Page 6 of 16
ADM3491
TEST CIRCUITS
375Ω
R/2
05234-004
375Ω
Figure 4. Driver Voltage Measurement Test Circuit
Figure 8. Driver Voltage Measurement Test Circuit 2
VCC
DE
RL
S1
CL
VOUT
DE IN
RL
S1
S2
05234-005
0V OR 3V
VCC
+1.5V
RE
–1.5V
RE IN
Figure 5. Driver Enable/Disable Test Circuit
S2
CL
VOUT
05234-009
VOC
R/2
VCC
VTST
RL
05234-008
VOD3
VOD
Figure 9. Receiver Enable/Disable Test Circuit
VOM
RL
CL1
IN
VOUT
CL2
VOUT
CL
05234-010
RLDIFF
D
S1
DE
05234-006
DI
VCC
Figure 6. Driver Differential Output Delay Test Circuit
Figure 10. Driver Propagation Delay Test Circuit
3V
RLDIFF
B
CL2
RO
R
RE
VID
1.5V
RE
CL
VOUT
05234-011
CL1
D
05234-007
DI
0V
A
Figure 11. Receiver Propagation Delay Test Circuit
Figure 7. Driver/Receiver Propagation Delay Test Circuit
Rev. A | Page 7 of 16
ADM3491
SWITCHING CHARACTERISTICS
3V
3V
1.5V
1.5V
tPLH
0V
Z
RE
1.5V
1.5V
0V
tPHL
tZL
tLZ
1/2VO
VO
1.5V
R
tSKEW
tSKEW
VO
90% POINT
VOL + 0.25V
VOL
tHZ
tZH
90% POINT
0V
VOH
tR
tF
05234-012
O/P HIGH
10% POINT
10% POINT
R
VOH – 0.25V
1.5V
0V
Figure 14. Driver Enable/Disable Timing
Figure 12. Driver Propagation Delay, Rise/Fall Timing
3V
RE
1.5V
1.5V
0V
tZL
tLZ
0V
0V
1.5V
R
tPLH
tPHL
VOL + 0.25V
VOL
tHZ
tZH
VOH
1.5V
O/P
LOW
VOH
O/P HIGH
1.5V
RO
VOL
R
1.5V
VOH – 0.25V
0V
Figure 13. Receiver Propagation Delay
Figure 15. Receiver Enable/Disable Timing
Rev. A | Page 8 of 16
05234-015
A–B
05234-013
–VO
O/P
LOW
05234-014
Y
ADM3491
14
14
12
12
OUTPUT CURRENT (mA)
10
8
6
4
0
0
0.5
1
1.5
2
2.5
3
8
6
4
2
05234-016
2
10
0
3.5
05234-019
OUTPUT CURRENT (mA)
TYPICAL PERFORMANCE CHARACTERISTICS
0
0.5
OUTPUT VOLTAGE (V)
1.5
2
2.5
3
3.5
4
OUTPUT HIGH VOLTAGE (V)
Figure 16. Receiver Output Low Voltage vs. Output Current
Figure 19. Receiver Output High Voltage vs. Output Current
3.3
0.8
0.7
3.25
0.6
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
1
0.5
IRO = 2.5mA
0.4
0.3
3.2
IRO = –1.5mA
3.15
3.1
0.2
05234-017
0
–40
–20
0
20
40
60
80
3
–40
100
05234-020
3.05
0.1
–20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 17. Receiver Output Low Voltage vs. Temperature
Figure 20. Receiver Output High Voltage vs. Temperature
2.6
120
2.5
2.4
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
100
80
60
40
2.3
2.2
2.1
2.0
1.9
1.7
05234-018
0
0
0.5
1
1.5
2
DIFFERENTIAL O/P VOLTAGE (V)
2.5
05234-021
1.8
20
1.6
–40
3
–20
0
20
40
60
80
100
TEMPERATURE (°C)
Figure 21. Driver Differential Output Voltage vs. Temperature
Figure 18. Driver Differential Output Voltage vs. Output Current
Rev. A | Page 9 of 16
ADM3491
[
1.2
]
100FT CAT 5
CABLE
T
1.1
3
T
1
T
0.9
1
2
0.7
–40
–20
0
20
40
60
80
T
4
100
CH1 1.00V
CH3 2.00V
TEMPERATURE (°C)
Figure 22. Supply Current vs. Temperature
[
T
05234-024
05234-022
0.8
CH2 1.00V
CH4 2.00V
M40.0ns CH3
640mV
Figure 24. Driving 100 ft. Cable H-L Transition
]
100
3
SHUTDOWN CURRENT (mA)
90
100FT
CABLE
T
T
1
2
T
T
80
70
60
50
40
30
4
CH1 1.00V
CH3 2.00V
CH2 1.00V
CH4 2.00V
M40.0ns CH3
05234-025
20
05234-023
SUPPLY CURRENT (mA)
T
10
0
–40
640mV
–20
0
20
40
TEMPERATURE (°C)
60
Figure 25. Shutdown Current vs. Temperature
Figure 23. Driving 100 ft. Cable L-H Transition
Rev. A | Page 10 of 16
80
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.
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
3.3V
0.1µF
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.
RE
0.1µF
VCC
VCC
A
Y
B
Z
DE
DI
RO
R
ADM3491
RS-485/RS-422 LINK
D
ADM3491
Z
B
Y
A
RO
DI
D
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
Transmission Type
Maximum Cable Length
Minimum Driver Output Voltage
Driver Load Impedance
Receiver Input Resistance
Receiver Input Sensitivity
Receiver Input Voltage Range
RS-422
Differential
4000 ft.
±2 V
100 Ω
4 kΩ min
±200 mV
−7 V to +7 V
R
RE
DE
GND
05234-026
GND
Figure 26. ADM3491 Full-Duplex Data Link
Table 7. Transmitting Truth Table
Transmitting
RS-485
Inputs
Differential
4000 ft.
±1.5 V
54 Ω
12 kΩ min
±200 mV
−7 V to +12 V
RE
X
X
0
1
DE
1
1
0
0
Outputs
DI
1
0
X
X
Z
0
1
Hi-Z
Hi-Z
Y
1
0
Hi-Z
Hi-Z
Table 8. Receiving Truth Table
Receiving
Inputs
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.
RE
0
0
0
1
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.
Rev. A | Page 11 of 16
DE
X
X
X
X
A–B
> +0.2 V
< −0.2 V
Inputs O/C
X
Outputs
RO
0
0
1
Hi-Z
ADM3491
OUTLINE DIMENSIONS
0.685 (17.40)
0.665 (16.89)
0.645 (16.38)
14
8
1
7
0.295 (7.49)
0.285 (7.24)
0.275 (6.99)
0.100 (2.54)
BSC
0.325 (8.26)
0.310 (7.87)
0.300 (7.62)
0.015 (0.38)
MIN
0.180 (4.57)
MAX
0.150 (3.81)
0.130 (3.30)
0.110 (2.79)
SEATING
0.022 (0.56) 0.060 (1.52) PLANE
0.018 (0.46) 0.050 (1.27)
0.014 (0.36) 0.045 (1.14)
0.150 (3.81)
0.135 (3.43)
0.120 (3.05)
0.015 (0.38)
0.010 (0.25)
0.008 (0.20)
COMPLIANT TO JEDEC STANDARDS MO-095-AB
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
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)
COPLANARITY
0.10
14
8
1
7
1.27 (0.0500)
BSC
0.51 (0.0201)
0.31 (0.0122)
6.20 (0.2441)
5.80 (0.2283)
1.75 (0.0689)
1.35 (0.0531)
SEATING
PLANE
0.50 (0.0197)
× 45°
0.25 (0.0098)
8°
0.25 (0.0098) 0° 1.27 (0.0500)
0.40 (0.0157)
0.17 (0.0067)
COMPLIANT TO JEDEC STANDARDS MS-012AB
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
Figure 28. 14-Lead Narrow Body Small Outline (SOIC)
(R-14)
Dimensions shown in inches and (millimeters)
Rev. A | Page 12 of 16
ADM3491
5.10
5.00
4.90
16
9
4.50
4.40
4.30
6.40
BSC
1
8
PIN 1
1.20
MAX
0.15
0.05
0.20
0.09
0.30
0.19
0.65
BSC
COPLANARITY
0.10
SEATING
PLANE
8°
0°
0.75
0.60
0.45
COMPLIANT TO JEDEC STANDARDS MO-153AB
Figure 29. 16-Lead Thin Shrink Small Outline (TSSOP)
(RU-16)
Dimensions shown in inches and (millimeters)
ORDERING GUIDE
Model
ADM3491AN
ADM3491AR
ADM3491AR-REEL
ADM3491AR-REEL7
ADM3491ARZ1
ADM3491ARZ-REEL1
ADM3491ARZ-REEL71
ADM3491ARU
ADM3491ARU-REEL
ADM3491ARU-REEL7
ADM3491ARUZ1
ADM3491ARUZ-REEL1
ADM3491ARUZ-REEL71
1
Temperature Range
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
Package Description
14-Lead Plastic DIP
14-Lead Narrow Body Small Outline (SOIC)
14-Lead Narrow Body Small Outline (SOIC)
14-Lead Narrow Body Small Outline (SOIC)
14-Lead Narrow Body Small Outline (SOIC)
14-Lead Narrow Body Small Outline (SOIC)
14-Lead Narrow Body Small Outline (SOIC)
16-Lead Thin Shrink Small Outline (TSSOP)
16-Lead Thin Shrink Small Outline (TSSOP)
16-Lead Thin Shrink Small Outline (TSSOP)
16-Lead Thin Shrink Small Outline (TSSOP)
16-Lead Thin Shrink Small Outline (TSSOP)
16-Lead Thin Shrink Small Outline (TSSOP)
Z = Pb-free part.
Rev. A | Page 13 of 16
Package Options
N-14
R-14
R-14
R-14
R-14
R-14
R-14
RU-16
RU-16
RU-16
RU-16
RU-16
RU-16
ADM3491
NOTES
Rev. A | Page 14 of 16
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)
Rev. A | Page 16 of 16