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ADM1491EBRMZ-REEL7 数据表(PDF) 1 Page - Analog Devices

部件名 ADM1491EBRMZ-REEL7
功能描述  16 Mbps, ESD Protected, Full-Duplex RS-485 Transceivers
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADM1491EBRMZ-REEL7 数据表(HTML) 1 Page - Analog Devices

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16 Mbps, ESD Protected,
Full-Duplex RS-485 Transceivers
ADM1491E
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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.
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
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 DIAGRAM
ADM1491E
RO
RE
DE
DI
A
B
Z
Y
GND
R
D
VCC
Figure 1.
GENERAL DESCRIPTION
The ADM1491E is an RS-485 transceiver with ±8 kV ESD pro-
tection 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 commu-
nications at data rates up to 16 Mbps.
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 differential transmitter outputs and receiver inputs feature
electrostatic discharge circuitry that provides protection to ±8 kV
using the human body model (HBM).
The ADM1491E operates from a single 5 V power supply. Exces-
sive 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 shut-
down 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 ADM1491E contains a fail-safe feature that
results in a logic high output state if the inputs are unconnected
(floating).
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 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.


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