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ADM1491EBRZ-REEL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
16 Mbps, ESD Protected,
Full-Duplex RS-485 Transceivers
Data Sheet
ADM1490E/ADM1491E
Rev. D
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 ©2008–2012 Analog Devices, Inc. All rights reserved.
FEATURES
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
ADM1490E packages
Narrow body, 8-lead SOIC
8-lead MSOP
ADM1491E packages
Narrow-body, 14-lead SOIC
10-lead MSOP
APPLICATIONS
RS-485/RS-422 interfaces
Industrial field networks
High data rate motor control
Multipoint data transmission systems
Single-ended-to-differential signal conversion
FUNCTIONAL BLOCK DIAGRAMS
ADM1490E
RO
DI
A
B
Z
Y
V
CC
GND
R
D
07430-001
Figure 1.
ADM1491E
RO
RE
DE
DI
A
B
Z
Y
GND
R
D
V
CC
07430-002
Figure 2.
GENERAL DESCRIPTION
The ADM1490E/ADM1491E are RS-485/RS-422 transceivers
with ±8 kV ESD protection and are suitable for high speed, full-
duplex communication on multipoint transmission lines. In
particular, the ADM1490E/ADM1491E are designed for use in
motor control applications requiring communications at data
rates up to 16 Mbps.
The ADM1490E/ADM1491E are designed for balanced trans-
mission lines and comply with TIA/EIA-485-A-98. The devices
each have a 12 kΩ receiver input impedance for unit load RS-485
operation, allowing up to 32 nodes on the bus.
The differential transmitter outputs and receiver inputs feature
electrostatic discharge circuitry that provides protection to ±8 kV
using the human body model (HBM).
The ADM1490E/ADM1491E operate 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. 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 receiver of the ADM1490E/ADM1491E contains a fail-safe
feature that results in a logic high output state if the inputs are
unconnected (floating).
The ADM1490E/ADM1491E feature extremely fast and closely
matched switching times. Minimal driver propagation delays
permit transmission at data rates up to 16 Mbps, and low skew
minimizes EMI interference.
The ADM1490E/ADM1491E are fully specified over the
commercial and industrial temperature ranges. The ADM1490E
is available in two packages: a narrow body, 8-lead SOIC and an
8-lead MSOP. The ADM1491E is also available in two packages:
a narrow body, 14-lead SOIC and a 10-lead MSOP.
ADM1490E/ADM1491E Data Sheet
Rev. D | Page 2 of 16
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagrams ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Specifications .................................................................. 4
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ..............................................7
Test Circuits ........................................................................................9
Theory of Operation ...................................................................... 10
Truth Tables................................................................................. 10
ESD Transient Protection Scheme ........................................... 10
Applications Information .............................................................. 12
Differential Data ......................................................................... 12
Cable and Data Rate ................................................................... 12
Typical Applications ................................................................... 12
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 15
REVISION HISTORY
2/12—Rev. C to Rev. D
Changes to Figure 8 .......................................................................... 6
Updated Outline Dimensions ....................................................... 14
12/10—Rev. B to Rev. C
Changes to Figure 29 ...................................................................... 12
Changes to Figure 30 ...................................................................... 13
7/09—Rev. A to Rev. B
Added ADM1490E, 8-Lead SOIC, and 8-Lead MSOP .... Universal
Changes to Table 4 ............................................................................ 5
Added Figure 7; Renumbered Figures Sequentially ..................... 6
Changes to Table 5 ............................................................................ 6
Changes to Typical Applications Section .................................... 12
Added Figure 29 .............................................................................. 12
Changes to Figure 30 ...................................................................... 13
Updated Outline Dimensions ....................................................... 14
Changes to Ordering Guide .......................................................... 15
2/09—Rev. 0 to Rev. A
Change to Table 9 ........................................................................... 11
12/08—Revision 0: Initial Version
Data Sheet ADM1490E/ADM1491E
Rev. D | Page 3 of 16
SPECIFICATIONS
4.75 V ≤ V
CC
≤ 5.25 V; all minimum/maximum specifications apply over the entire recommended operation range, unless otherwise
noted. All typical specifications are at T
A
= 25°C, V
CC
= 5.0 V, unless otherwise noted.
Table 1.
Parameter Symbol Min Typ Max Unit Test Conditions/Comments
SUPPLY CURRENT
Outputs Enabled I
CC1
1.2 2.0 mA Outputs unloaded, digital inputs = V
CC
or GND
Outputs Disabled I
CC2
0.8 1.5 mA Outputs unloaded, digital inputs = V
CC
or GND
DRIVER
Differential Outputs
Differential Output Voltage, Loaded |V
OD2
| 2.0 5.0 V R
L
= 100 Ω (RS-422), see Figure 21
1.5 5.0 V R
L
= 54 Ω (RS-485), see Figure 21
|V
OD3
| 1.5 5.0 V −7 V ≤ V
TEST
≤ +12 V, see Figure 22
∆|V
OD
| for Complementary Output States ∆|V
OD2
| 0.2 V R
L
= 54 Ω or 100 Ω, see Figure 21
Common-Mode Output Voltage V
OC
3.0 V R
L
= 54 Ω or 100 Ω, see Figure 21
∆|V
OC
| for Complementary Output States ∆|V
OC
| 0.2 V R
L
= 54 Ω or 100 Ω, see Figure 21
Output Leakage Current (Y, Z) I
O
100 µA DE = 0 V, V
DD
= 0 V or 5 V, V
IN
= 12 V
I
O
−100 µA DE = 0 V, V
DD
= 0 V or 5 V, V
IN
= −7 V
Output Short-Circuit Current I
OS
250 mA −7 V < V
OUT
< +12 V
Logic Inputs DE,
RE
, DI
Input Low Voltage V
IL
0.8 V DE,
RE
, DI
Input High Voltage V
IH
2.0 V DE,
RE
, DI
Input Current I
I
−1 +1 µA DE,
RE
, DI
RECEIVER
Differential Inputs
Differential Input Threshold Voltage V
TH
−0.2 +0.2 V −7 V < V
CM
< +12 V
Input Voltage Hysteresis V
HYS
30 mV V
CM
= 0 V
Input Current (A, B)
I
I
1.0
mA
V
CM
= 12 V
−0.8 mA V
CM
= −7 V
Line Input Resistance R
IN
12 30 kΩ −7 V ≤ V
CM
≤ +12 V
Logic Outputs
Output Voltage Low V
OL
0.4 V I
OUT
= +4.0 mA, V
A
− V
B
= −0.2 V
Output Voltage High V
OH
4.0 V I
OUT
= −4.0 mA, V
A
− V
B
= +0.2 V
Short-Circuit Current 85 mA
Three-State Output Leakage Current I
OZR
±1 µA V
CC
= 5.25 V, 0.4 V < V
OUT
< 2.4 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

ADM1491EBRZ-REEL7

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Buy ADM1491EBRZ-REEL7
Manufacturer:
Analog Devices Inc.
Description:
RS-422/RS-485 Interface IC 5V 16Mbps ESD Protect Full-Duplex
Lifecycle:
New from this manufacturer.
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