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PDF ADM1490E Data sheet ( Hoja de datos )
| Número de pieza | ADM1490E | |
| Descripción | Full-Duplex RS-485 Transceivers | |
| Fabricantes | Analog Devices | |
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Data Sheet
16 Mbps, ESD Protected,
Full-Duplex RS-485 Transceivers
ADM1490E/ADM1491E
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
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
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAMS
VCC
ADM1490E
A
RO R
B
DI D
Z
Y
GND
Figure 1.
VCC
ADM1491E
A
RO R
B
RE
DE
DI D
Z
Y
GND
Figure 2.
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.
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.
1 page  
Data Sheet
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 3.
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
−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.
ADM1490E/ADM1491E
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 4. Thermal Resistance
Package Type
8-Lead SOIC
14-Lead SOIC
8-Lead MSOP
10-Lead MSOP
θJA
121
86
133
133
Unit
°C/W
°C/W
°C/W
°C/W
ESD CAUTION
Rev. D | Page 5 of 16
5 Page 
Data Sheet
100%
90%
ADM1490E/ADM1491E
36.8%
10%
tRL
tDL
TIME (t)
Figure 28. Human Body Model ESD Current Waveform
Table 9. ADM1490E/ADM1491E ESD Test Results
ESD Test Method
Human Body Model
Input/Output Pins
±8 kV
Other Pins
±4 kV
Rev. D | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADM1490E.PDF ] | |
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