AD ADM1491EBRZ

16 Mbps, ESD Protected,
Full-Duplex RS-485 Transceivers
ADM1491E
RS-485/RS-422 full duplex transceiver, for high speed motor
control applications
16 Mbps data rate
±8 kV ESD protection on RS-485 input/output pins
Complies with ANSI/TIA/EIA-485-A-1998
Open circuit fail-safe
Suitable for 5 V power supply applications
32 nodes on the bus (1 unit load)
Thermal shutdown protection
Operating temperature range: −40°C to +85°C
Packages
Narrow-body 14-lead SOIC
10-lead MSOP
FUNCTIONAL BLOCK DIAGRAM
VCC
ADM1491E
A
RO
R
B
RE
DE
Z
DI
D
Y
GND
07430-002
FEATURES
Figure 1.
APPLICATIONS
RS-485/RS-422 interfaces
Industrial field networks
High data rate motor control
Multipoint data transmission systems
Single-ended to differential signal conversion
GENERAL DESCRIPTION
The ADM1491E is an RS-485 transceiver with ±8 kV ESD protection and is suitable for high speed, full-duplex communication
on multipoint transmission lines. In particular, the ADM1491E
is designed for use in motor control applications requiring communications at data rates up to 16 Mbps.
Short-circuit protection circuits limit the maximum output
current to ±250 mA during fault conditions. A thermal shutdown circuit senses if the die temperature rises above 150°C
and forces the driver outputs into a high impedance state under
this condition.
The ADM1491E is designed for balanced transmission lines
and complies with TIA/EIA-485-A-98. The device has a 12 kΩ
receiver input impedance for unit load RS-485 operation
allowing up to 32 nodes on the bus.
The receiver of the ADM1491E contains a fail-safe feature that
results in a logic high output state if the inputs are unconnected
(floating).
The differential transmitter outputs and receiver inputs feature
electrostatic discharge circuitry that provides protection to ±8 kV
using the human body model (HBM).
The ADM1491E features extremely fast and closely matched
switching times. Minimal driver propagation delays permit
transmission at data rates up to 16 Mbps while low skew
minimizes EMI interference.
The ADM1491E operates from a single 5 V power supply. Excessive power dissipation caused by bus contention or output shorting
is prevented by short-circuit protection and thermal circuitry.
The ADM1491E is fully specified over the commercial and
industrial temperature ranges and is available in two packages:
a narrow-body 14-lead SOIC and a 10-lead MSOP.
Rev. 0
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: 781.461.3113
©2008 Analog Devices, Inc. All rights reserved.
ADM1491E
TABLE OF CONTENTS
Features .............................................................................................. 1
Typical Performance Characteristics ..............................................7
Applications ....................................................................................... 1
Test Circuits ........................................................................................9
Functional Block Diagram .............................................................. 1
Theory of Operation ...................................................................... 10
General Description ......................................................................... 1
Truth Tables................................................................................. 10
Revision History ............................................................................... 2
ESD Transient Protection Scheme ........................................... 10
Specifications..................................................................................... 3
Applications Information .............................................................. 12
Timing Specifications .................................................................. 4
Differential Data ......................................................................... 12
Absolute Maximum Ratings............................................................ 5
Cable and Data Rate ................................................................... 12
Thermal Resistance ...................................................................... 5
Typical Applications ................................................................... 12
ESD Caution .................................................................................. 5
Outline Dimensions ....................................................................... 13
Pin Configurations and Function Descriptions ........................... 6
Ordering Guide .......................................................................... 13
REVISION HISTORY
12/08—Revision 0: Initial Version
Rev. 0 | Page 2 of 16
ADM1491E
SPECIFICATIONS
4.75 V ≤ VCC ≤ 5.25 V; all minimum/maximum specifications apply over the entire recommended operation range, unless otherwise
noted. All typical specifications are at TA = 25°C, VCC = 5.0 V, unless otherwise noted.
Table 1.
Parameter
SUPPLY CURRENT
Outputs Enabled
Outputs Disabled
DRIVER
Differential Outputs
Differential Output Voltage, Loaded
∆|VOD| for Complementary Output States
Common-Mode Output Voltage
∆|VOC| for Complementary Output States
Output Leakage Current (Y, Z)
Output Short-Circuit Current
Logic Inputs DE, RE, DI
Input Low Voltage
Input High Voltage
Input Current
RECEIVER
Differential Inputs
Differential Input Threshold Voltage
Input Voltage Hysteresis
Input Current (A, B)
Line Input Resistance
Logic Outputs
Output Voltage Low
Output Voltage High
Short-Circuit Current
Three-State Output Leakage Current
Symbol
Min
ICC1
ICC2
|VOD2|
|VOD3|
∆|VOD2|
VOC
∆|VOC|
IO
IO
IOS
VIL
VIH
II
VTH
VHYS
II
Max
Unit
Test Conditions
1.2
0.8
2.0
1.5
mA
mA
Outputs unloaded, digital inputs = VCC or GND
Outputs unloaded, digital inputs = VCC or GND
5.0
5.0
5.0
0.2
3.0
0.2
100
V
V
V
V
V
V
μA
μA
mA
RL = 100 Ω (RS-422), see Figure 19
RL = 54 Ω (RS-485), see Figure 19
−7 V ≤ VTEST ≤ +12 V, see Figure 20
RL = 54 Ω or 100 Ω, see Figure 19
RL = 54 Ω or 100 Ω, see Figure 19
RL = 54 Ω or 100 Ω, see Figure 19
DE = 0 V, VDD = 0 V or 5 V, VIN = 12 V
DE = 0 V, VDD = 0 V or 5 V, VIN = −7 V
−7 V < VOUT < +12 V
V
V
μA
DE, RE, DI
DE, RE, DI
DE, RE, DI
V
mV
mA
mA
kΩ
−7 V < VCM < +12 V
VCM = 0 V
VCM = 12 V
VCM = −7 V
−7 V ≤ VCM ≤ +12 V
V
V
mA
μA
IOUT = +4.0 mA, VA − VB = −0.2 V
IOUT = −4.0 mA, VA − VB = +0.2 V
2.0
1.5
1.5
−100
250
0.8
2.0
−1
+1
−0.2
+0.2
30
1.0
RIN
−0.8
12
VOL
VOH
4.0
IOZR
Typ
30
0.4
85
±1
Rev. 0 | Page 3 of 16
VCC = 5.25 V, 0.4 V < VOUT < 2.4 V
ADM1491E
TIMING SPECIFICATIONS
TA = −40°C to +85°C.
Table 2.
Parameter
DRIVER
Maximum Data Rate
Propagation Delay
Symbol
Min
Typ
Max
Unit
Test Conditions
tDPLH, tDPHL
11
17
Mbps
ns
RL = 54 Ω, CL = 100 pF, see Figure 21 and Figure 2
tSKEW
0.5
2
ns
tDR, tDF
tZH, tZL
tHZ, tLZ
8
15
20
20
ns
ns
ns
RL = 54 Ω, CL = 100 pF, see Figure 21 and Figure 2,
tSKEW = |tDPLH − tDPHL|
RL = 54 Ω, CL = 100 pF, see Figure 21 and Figure 2
RL = 110 Ω, CL = 50 pF, see Figure 22 and Figure 4
RL = 110 Ω, CL = 50 pF, see Figure 22 and Figure 4
tPLH, tPHL
tSKEW
tZH, tZL
tHZ, tLZ
12
0.4
20
2
13
13
ns
ns
ns
ns
CL = 15 pF, see Figure 23 and Figure 3
CL = 15 pF, see Figure 23 and Figure 3
RL = 1 kΩ, CL = 15 pF, see Figure 24 and Figure 5
RL = 1 kΩ, CL = 15 pF, see Figure 24 and Figure 5
16
Driver Output Skew
Rise Time/Fall Time
Enable Time
Disable Time
RECEIVER
Propagation Delay
Skew |tPLH − tPHL|
Enable Time
Disable Time
Timing Diagrams
Switching Characteristics
VCC
VCC
VCC/2
VCC/2
DE
0.5VCC
0.5VCC
0V
0V
tDPLH
tZL
tDPHL
tLZ
2.3V
Z
1/2VO
Y, Z
VO
VOL + 0.5V
VOL
tZH
Y
tHZ
2.3V
90% POINT
VDIFF
–VO
90% POINT
VDIFF = V(Y) – V(Z)
0V
10% POINT
07430-009
+VO
10% POINT
tDR
07430-011
VOH
VOH – 0.5V
Y, Z
tDF
Figure 4. Driver Enable/Disable Timing
Figure 2. Driver Propagation Delay Rise/Fall Timing
0.7VCC
A–B
0V
0V
RE
0.5VCC
0.5VCC
0.3VCC
tPHL
VOH
1.5V
tSKEW = |tPLH – tPHL|
1.5V
VOL
1.5V
RO
VOL + 0.5V
OUTPUT LOW
tZH
07430-010
RO
tLZ
VOL
tHZ
OUTPUT HIGH
RO
1.5V
VOH
VOH – 0.5V
0V
Figure 5. Receiver Enable/Disable Timing
Figure 3. Receiver Propagation Delay Timing
Rev. 0 | Page 4 of 16
07430-012
tPLH
tZL
ADM1491E
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
THERMAL RESISTANCE
Table 3.
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Parameter
VCC to GND
Digital I/O Voltage (DE, RE)
Driver Input Voltage (DI)
Receiver Output Voltage (RO)
Driver Output/Receiver Input Voltage
(A, B, Y, Z)
Operating Temperature Range
Storage Temperature Range
ESD (HBM) on A, B, Y, and Z
Rating
−0.3 V to +7 V
−0.3 V to VCC + 0.3 V
−0.3 V to VCC + 0.3 V
−0.3 V to VCC + 0.3 V
−9 V to +14 V
Table 4. Thermal Resistance
Package Type
14-Lead SOIC
10-Lead MSOP
ESD CAUTION
−40°C to +85°C
−55°C to +150°C
±8 kV
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.
Rev. 0 | Page 5 of 16
θJA
104.5
133
θJC
87.2
Unit
°C/W
°C/W
ADM1491E
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
ADM1491E
ADM1491E
14 VCC
RO 2
13 VCC
RE 2
RE 3
12 A
DE 3
TOP VIEW
11 B
(Not to Scale)
10 Z
DI 5
DI 4
DE 4
9
Y
GND 7
8
NC
NC = NO CONNECT
TOP VIEW
(Not to Scale)
9
A
8
B
7
Z
6
Y
07430-013
GND 6
GND 5
10 VCC
07430-015
NC 1
RO 1
Figure 7. 10-Lead MSOP Pin Configuration
Figure 6. 14-Lead Narrow-Body SOIC Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
14-Lead SOIC 10-Lead MSOP
1
N/A 1
2
1
3
2
Mnemonic
NC
RO
RE
4
3
DE
5
4
DI
6
7
8
9
10
11
12
13
14
5
N/A1
N/A1
6
7
8
9
10
N/A1
GND
GND
NC
Y
Z
B
A
VCC
VCC
1
Description
No Connect. This pin is available on the 14-lead SOIC only.
Receiver Output.
Receiver Output Enable. A low level enables the receiver output, whereas a high level
places the receiver output in a high impedance state.
Driver Output Enable. A high level enables the differential driver outputs, A and B,
whereas a low places the differential driver outputs in a high impedance state.
Driver Input. When the driver is enabled, a logic low on DI forces A low and B high,
whereas logic high on DI forces A high and B low.
Ground.
Ground. This pin is available on the 14-lead SOIC only.
No Connect. This pin is available on the 14-lead SOIC only.
Noninverting Driver Output Y.
Inverting Driver Output Z.
Inverting Receiver Input B.
Noninverting Receiver Input A.
Power Supply (5 V ± 5%).
Power Supply (5 V ± 5%). This pin is available on the 14-lead SOIC only.
N/A indicates not applicable to the MSOP.
Rev. 0 | Page 6 of 16
ADM1491E
35
0.50
30
0.45
OUTPUT VOLTAGE (V)
25
20
15
10
0.40
0.35
0.30
0.25
0.20
0
0
0.25
0.50
0.75
1.00
1.25
OUTPUT VOLTAGE (V)
1.50
1.75
2.00
07430-016
5
Figure 8. Output Current vs. Receiver Output Low Voltage
0.15
–50
–25
0
25
TEMPERATURE (°C)
50
75
85
07430-019
OUTPUT CURRENT (mA)
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 11. Receiver Output Low Voltage vs. Temperature (IOUT = 8 mA)
0
80
70
–5
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
60
–10
–15
–20
50
40
30
20
10
–25
4.00
4.25
4.50
OUTPUT VOLTAGE (V)
4.75
5.00
07430-017
3.75
–10
0
Figure 9. Output Current vs. Receiver Output High Voltage
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT VOLTAGE (V)
3.5
4.0
4.5
07430-020
0
–30
3.50
Figure 12. Output Current vs. Driver Differential Output Voltage
4.75
3.00
2.95
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
4.70
4.65
4.60
2.90
2.85
2.80
2.75
2.70
4.55
–25
0
25
TEMPERATURE (°C)
50
75
85
Figure 10. Receiver Output High Voltage vs. Temperature (IOUT = 8 mA)
2.60
–50
–25
0
25
TEMPERATURE (°C)
50
75
85
07430-021
4.50
–50
07430-018
2.65
Figure 13. Driver Differential Output Voltage vs. Temperature (RL = 56.3 Ω)
Rev. 0 | Page 7 of 16
ADM1491E
80
1
60
50
40
30
3
20
07430-032
OUTPUT CURRENT (mA)
70
0
0
0.5
1.0
1.5
2.0
2.5
OUTPUT VOLTAGE (V)
3.0
3.5
4.0
07430-022
10
CH1 5V
CH3 2V
CH2 2V
M200ns
A CH1
1.6V
Figure 17. Unloaded Driver Differential Outputs
Figure 14. Output Current vs. Driver Output Low Voltage
0
1
–20
–30
–40
–50
3
–60
07430-033
OUTPUT CURRENT (mA)
–10
–80
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT VOLTAGE (V)
4.0
4.5
5.0
07430-023
–70
Figure 15. Output Current vs. Driver Output High Voltage
1.25
1.10
1.05
1.00
0.95
DRIVER DISABLED
0.85
0.80
–50
–25
0
25
TEMPERATURE (°C)
50
75
85
07430-024
OUTPUT CURRENT (mA)
DRIVER ENABLED
1.15
0.90
CH2 2V
M200ns
A CH1
Figure 18. Loaded Driver Differential Outputs
(RL Differential = 54 Ω, CL1 = CL2 = 100 pF)
1.30
1.20
CH1 5V
CH3 2V
Figure 16. Output Current vs. Temperature
Rev. 0 | Page 8 of 16
1.6V
ADM1491E
TEST CIRCUITS
Y
RL
2
VOD2
VOUT
Y
VOC
07430-003
DI
Figure 19. Driver Voltage Measurements
Y
Z
A
60Ω
375Ω V
TEST
Z
07430-004
B
Figure 20. Driver Voltage Measurements
VOUT
RE
CL
Figure 23. Receiver Propagation Delay
+1.5V
Y
CL
RL
–1.5V
RE
RL
Z
CL
07430-005
DI
VCC
S1
S2
CL
VOUT
RE
Figure 21. Driver Propagation Delay
Figure 24. Receiver Enable/Disable Timing
Rev. 0 | Page 9 of 16
07430-008
VOD3
S2
CL
50pF
Figure 22. Driver Enable/Disable Timing
375Ω
DI
S1
DE
VCC
RL
110Ω
07430-006
RL
2
Z
07430-007
DI
ADM1491E
THEORY OF OPERATION
The ADM1491E is an RS-485 transceiver that operates from a
single 5 V ± 5% power supply. The ADM1491E is intended for
balanced data transmission and complies with both TIA/EIA-485-A
and TIA/EIA-422-B. It contains a differential line driver and a
differential line receiver and is suitable for full-duplex data
transmission.
ESD TRANSIENT PROTECTION SCHEME
The input impedance of the ADM1491E is 12 kΩ, allowing up
to 32 transceivers on the differential bus. A thermal shutdown
circuit prevents excessive power dissipation caused by bus contention or by output shorting. This feature forces the driver
output into a high impedance state if, during fault conditions,
a significant temperature increase is detected in the internal
driver circuitry.
ESD Testing
The ADM1491E features very low propagation delay, ensuring
maximum baud rate operation. The balanced driver ensures
distortion free transmission.
Another important specification is a measure of the skew
between the complementary outputs. Excessive skew impairs
the noise immunity of the system and increases the amount
of electromagnetic interference (EMI).
TRUTH TABLES
Table 6. Truth Table Abbreviations
Letter
H
I
L
X
Z
Description
High level
Indeterminate
Low level
Irrelevant
High impedance (off )
Two coupling methods are used for ESD testing: contact discharge and air gap discharge. Contact discharge calls for a direct
connection to the unit being tested; air gap discharge uses a higher
test voltage but does not make direct contact with the unit under
test. With air discharge, the discharge gun is moved toward the
unit under test, developing an arc across the air gap; hence the
term air discharge. This method is influenced by humidity, temperature, barometric pressure, distance, and rate of closure of
the discharge gun. The contact discharge method, though less
realistic, is more repeatable and is gaining acceptance and
preference over the air gap method.
Although very little energy is contained within an ESD pulse,
the extremely fast rise time, coupled with high voltages, can cause
failures in unprotected semiconductors. Catastrophic destruction
can occur immediately because of arcing or heating. Even if catastrophic failure does not occur immediately, the device can suffer
from parametric degradation, resulting in degraded performance.
The cumulative effects of continuous exposure can eventually
lead to complete failure.
HIGH
VOLTAGE
GENERATOR
C1
DE
H
H
L
Z
L
H
Z
DEVICE
UNDER TEST
NOTES
1. THE ESD TEST METHOD USED IS THE
HUMAN BODY MODEL (±8kV) WITH
R2 = 1500Ω AND C1 = 100pF.
Table 7. Transmitting
Inputs
DI
H
L
X
R2
Figure 25. ESD Generator
Outputs
Y
H
L
Z
I/O lines are particularly vulnerable to ESD damage. Simply
touching or plugging in an I/O cable can result in a static discharge that can damage or destroy the interface product connected
to the I/O port. It is, therefore, extremely important to have high
levels of ESD protection on the I/O lines.
Table 8. Receiving
RE
Inputs
A−B
RO
L
L
L
L
H
≥ +0.2 V
≤ −0.2 V
−0.2 V ≤ A − B ≤ +0.2 V
Inputs open
X
H
L
I
H
Z
07430-025
The receiver contains a fail-safe feature that results in a logic
high output state if the inputs are unconnected (floating).
The ADM1491E uses protective clamping structures on its
inputs and outputs to clamp the voltage to a safe level and
dissipate the energy present in ESD (electrostatic). The
protection structure achieves ESD protection up to ±8 kV
human body model (HBM).
Output
The ESD discharge can induce latch-up in the device under test.
Therefore, it is important to conduct ESD testing on the I/O pins
while device power is applied. This type of testing is more representative of a real-world I/O discharge where the equipment is
operating normally when the discharge occurs.
Rev. 0 | Page 10 of 16
ADM1491E
100%
IPEAK
90%
36.8%
tRL
TIME (t)
tDL
07430-026
10%
Figure 26. Human Body Model ESD Current Waveform
Table 9. ADM1491E ESD Test Results
ESD Test Method
Human Body Model
Input/Output Pins
±8 kV
Rev. 0 | Page 11 of 16
Other Pins
±1.5 kV
ADM1491E
APPLICATIONS INFORMATION
DIFFERENTIAL DATA
CABLE AND DATA RATE
Differential data transmission reliably transmits data at high
rates over long distances and through noisy environments.
Differential transmission nullifies the effects of ground shifts
and noise signals that appear as common-mode voltages on the
line. There are two main standards approved by the Electronics
Industries Association (EIA) that specify the electrical characteristics of transceivers used in differential data transmission.
Twisted pair is the transmission line of choice for RS-485
communications. Twisted pair cable tends to cancel commonmode noise and causes cancellation of the magnetic fields
generated by the current flowing through each wire, thereby
reducing the effective inductance of the pair.
The RS-422 standard specifies data rates of up to 10 MBaud and
line lengths of up to 4000 feet. A single driver can drive a transmission line with as many as 10 receivers.
The RS-485 standard addresses true multipoint communications.
This standard meets or exceeds all of the requirements of RS-422,
and it allows as many as 32 drivers and 32 receivers to connect
to a single bus. An extended common-mode range of −7 V to
+12 V is defined. The most significant difference between the
RS-422 and the RS-485 is that the drivers with RS-485 can be
disabled, allowing more than one driver to be connected to a
single line; as many as 32 drivers can 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.
An RS-485 transmission line can have as many as 32 transceivers on the bus. Only one driver can transmit at a time, but
multiple receivers may be enabled simultaneously.
As with any transmission line, it is important to minimize
reflections. This can be achieved by terminating the extreme
ends of the line using resistors equal to the characteristic
impedance of the line. Keep stub lengths of the main line as
short as possible. A properly terminated transmission line
appears purely resistive to the driver.
TYPICAL APPLICATIONS
Figure 27 shows a typical configuration for a full-duplex
multipoint application using the ADM1491E. To minimize
reflections, the lines must be terminated at the receiving end in
its characteristic impedance, and stub lengths off the main line
must be kept as short as possible.
MAXIMUM NUMBER OF NODES = 32
MASTER
SLAVE
A
R
RO
B
Y
D
RT
DE
RE
Z
D
B
RT
Y
A
ADM1491E
RE
R
RO
ADM1491E
A
B
Z
Y
A
B
Z
Y
SLAVE
ADM1491E
SLAVE
R
ADM1491E
R
D
RO
RE
DE
D
DI
RO
NOTES
1. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE.
Figure 27. Typical Application
Rev. 0 | Page 12 of 16
RE
DE
DI
07430-028
DE
DI
DI
Z
ADM1491E
OUTLINE DIMENSIONS
8.75 (0.3445)
8.55 (0.3366)
8
14
1
7
6.20 (0.2441)
5.80 (0.2283)
1.27 (0.0500)
BSC
0.25 (0.0098)
0.10 (0.0039)
COPLANARITY
0.10
0.50 (0.0197)
0.25 (0.0098)
1.75 (0.0689)
1.35 (0.0531)
SEATING
PLANE
0.51 (0.0201)
0.31 (0.0122)
45°
8°
0°
0.25 (0.0098)
0.17 (0.0067)
1.27 (0.0500)
0.40 (0.0157)
COMPLIANT TO JEDEC STANDARDS MS-012-AB
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.
060606-A
4.00 (0.1575)
3.80 (0.1496)
Figure 28. 14-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-14)
Dimensions shown in millimeters and (inches)
3.10
3.00
2.90
6
10
3.10
3.00
2.90
1
5.15
4.90
4.65
5
PIN 1
0.50 BSC
0.95
0.85
0.75
1.10 MAX
0.15
0.05
0.33
0.17
SEATING
PLANE
0.23
0.08
8°
0°
0.80
0.60
0.40
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-187-BA
Figure 29. 10-Lead Mini Small Outline Package [MSOP]
(RM-10)
Dimensions shown in millimeters
ORDERING GUIDE
Model
ADM1491EBRZ 1
ADM1491EBRZ-REEL71
ADM1491EBRMZ1
ADM1491EBRMZ-REEL71
1
Temperature
Range
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
Package Description
14-Lead Standard Small Outline Package, Narrow Body [SOIC_N]
14-Lead Standard Small Outline Package, Narrow Body [SOIC_N]
10-Lead Mini Small Outline Package [MSOP]
10-Lead Mini Small Outline Package [MSOP]
Z = RoHS Compliant Part.
Rev. 0 | Page 13 of 16
Package
Option
R-14
R-14
RM-10
RM-10
Branding
F0D
F0D
ADM1491E
NOTES
Rev. 0 | Page 14 of 16
ADM1491E
NOTES
Rev. 0 | Page 15 of 16
ADM1491E
NOTES
©2008 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D07430-0-12/08(0)
Rev. 0 | Page 16 of 16