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부품번호 ADM2491E 기능
기능 Half-/Full-Duplex iCoupler Isolated RS-485 Transceiver
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ADM2491E 데이터시트, 핀배열, 회로
Data Sheet
High Speed, ESD-Protected, Half-/Full-Duplex
iCoupler Isolated RS-485 Transceiver
ADM2491E
FEATURES
Isolated, RS-485/RS-422 transceiver, configurable as half- or
full-duplex
±8 kV ESD protection on RS-485 input/output pins
16 Mbps data rate
Complies with ANSI TIA/EIA RS-485-A-1998 and
ISO 8482: 1987(E)
Suitable for 5 V or 3.3 V operation (VDD1)
High common-mode transient immunity: >25 kV/μs
Receiver has open-circuit, fail-safe design
32 nodes on the bus
Thermal shutdown protection
Safety and regulatory approvals
UL recognition: 5000 V rms isolation voltage
for 1 minute, per UL 1577
VDE certificate of conformity
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
Reinforced insulation, VIORM = 849 V peak
Operating temperature range: −40°C to +85°C
Wide body, 16-lead SOIC package
APPLICATIONS
Isolated RS-485/RS-422 interfaces
Industrial field networks
INTERBUS
Multipoint data transmission systems
FUNCTIONAL BLOCK DIAGRAM
VDD1
VDD2
ADM2491E
DE
Y
TxD
Z
RxD
RE
GND1
Figure 1.
GND2
A
B
GENERAL DESCRIPTION
The ADM2491E is an isolated data transceiver with ±8 kV ESD
protection and is suitable for high speed, half- or full-duplex
communication on multipoint transmission lines. For half-
duplex operation, the transmitter outputs and the receiver
inputs share the same transmission line. Transmitter output
Pin Y is linked externally to receiver input Pin A, and transmit-
ter output Pin Z is linked to receiver input Pin B.
The ADM2491E is designed for balanced transmission lines
and complies with ANSI TIA/EIA RS-485-A-1998 and ISO
8482: 1987(E). The device employs Analog Devices, Inc.,
iCoupler® technology to combine a 3-channel isolator, a three-
state differential line driver, and a differential input receiver into
a single package.
The differential transmitter outputs and receiver inputs feature
electrostatic discharge circuitry that provides protection to
±8 kV using the human body model (HBM). The logic side of
the device can be powered with either a 5 V or a 3.3 V supply,
whereas the bus side requires an isolated 5 V supply.
The device has current-limiting and thermal shutdown features
to protect against output short circuits and situations in which
bus contention could cause excessive power dissipation.
The ADM2491E is available in a wide body, 16-lead SOIC package
and operates over the −40°C to +85°C temperature range.
Rev. C
Document Feedback
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com




ADM2491E pdf, 반도체, 판매, 대치품
Data Sheet
ADM2491E
SPECIFICATIONS
All voltages are relative to their respective ground; 3.0 V ≤ VDD1 ≤ 5.5 V, 4.5 V ≤ VDD2 ≤ 5.5 V. All minimum/maximum specifications
apply over the entire recommended operation range, unless otherwise noted. All typical specifications are at TA = 25°C, VDD1 = VDD2 =
5.0 V, unless otherwise noted.
Table 1.
Parameter
SUPPLY CURRENT
Power Supply Current, Logic Side
TxD/RxD Data Rate = 2 Mbps
TxD/RxD Data Rate = 16 Mbps
Power Supply Current, Bus Side
TxD/RxD Data Rate = 2 Mbps
TxD/RxD Data Rate = 16 Mbps
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)
Short-Circuit Output Current
Logic Inputs DE, RE, TxD
Input Threshold Low
Input Threshold High
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
COMMON-MODE TRANSIENT IMMUNITY1
Symbol Min
Typ Max Unit Test Conditions
IDD1 3.0 mA Unloaded output
IDD1 6 mA Half-duplex configuration,
RTERMINATION = 120 Ω, see Figure 5
IDD2 4.0 mA Unloaded output
IDD2 50 mA VDD2 = 5.5 V, half-duplex
configuration,
RTERMINATION = 120 Ω, see Figure 5
|VOD|
∆|VOD|
VOC
∆|VOC|
IO
IOS
VIL
VIH
ITxD
2.0
1.5
1.5
−100
0.25 × VDD1
−10 +0.01
5.0 V RL = 100 Ω (RS-422), see Figure 3
5.0 V RL = 54 Ω (RS-485), see Figure 3
5.0 V −7 V ≤ VTEST1 ≤ 12 V, see Figure 4
0.2 V RL = 54 Ω or 100 Ω, see Figure 3
3.0 V RL = 54 Ω or 100 Ω, see Figure 3
0.2 V RL = 54 Ω or 100 Ω, see Figure 3
100 μA DE = 0 V, VDD2 = 0 V or 5 V, VIN = 12 V
μA DE = 0 V, VDD2 = 0 V or 5 V, VIN = −7 V
250 mA
0.7 × VDD1
+10
V
V
μA
VTH
VHYS
II
RIN
VOLRxD
VOHRxD
IOZR
−0.2
30
−0.8
12
+0.2
+1.0
VDD1 − 0.3
25
0.2
VDD1 − 0.2
0.4
100
±1
V
mV VOC = 0 V
mA VOC = 12 V
mA VOC = −7 V
V
V
mA
μA
kV/μs
IORxD = 1.5 mA, VA − VB = −0.2 V
IORxD = −1.5 mA, VA − VB = 0.2 V
VDD1 = 5.5 V, 0 V < VOUT < VDD1
VCM = 1 kV, transient magnitude =
800 V
1 CM is the maximum common-mode voltage slew rate that can be sustained while maintaining specification-compliant operation. VCM is the common-mode potential
difference between the logic and bus sides. The transient magnitude is the range over which the common mode is slewed. The common-mode voltage slew rates apply
to both rising and falling common-mode voltage edges.
Rev. C | Page 3 of 16

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ADM2491E 전자부품, 판매, 대치품
ADM2491E
ABSOLUTE MAXIMUM RATINGS
TA = 25 °C, unless otherwise noted. Each voltage is relative to its
respective ground.
Table 7.
Parameter
Storage Temperature
Ambient Operating Temperature
VDD1
VDD2
Logic Input Voltages
Bus Terminal Voltages
Logic Output Voltages
Average Output Current, per Pin
ESD (Human Body Model) on A, B, Y,
and Z Pins
θJA Thermal Impedance
Rating
−55°C to +150°C
−40°C to +85°C
−0.5 V to +7 V
−0.5 V to +6 V
−0.5 V to VDD1 + 0.5 V
−9 V to +14 V
−0.5 V to VDD1 + 0.5 V
±35 mA
±8 kV
60°C/W
Data Sheet
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.
Absolute maximum ratings apply individually only, not in
combination.
ESD CAUTION
Rev. C | Page 6 of 16

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ADM2491E

Half-/Full-Duplex iCoupler Isolated RS-485 Transceiver

Analog Devices
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