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ADM2491E

更新时间： 2024-11-21 04:04:35
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亚德诺 - ADI /
页数 文件大小 规格书
16页 563K
描述
High Speed, ESD-Protected, Half-/Full-Duplex, iCoupler Isolated RS-485 Transceiver

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ADM2491E 数据手册

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High Speed, ESD-Protected, Half-/Full-Duplex,  
iCoupler Isolated RS-485 Transceiver  
ADM2491E  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
V
V
DD1  
DD2  
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  
ADM2491E  
DE  
Complies with ANSI TIA/EIA RS-485-A-1998 and  
ISO 8482: 1987(E)  
Y
Z
TxD  
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  
A
B
RxD  
RE  
Thermal shutdown protection  
Safety and regulatory approvals pending  
UL recognition: 5000 V rms isolation voltage  
for 1 minute, per UL 1577  
GND  
GND  
2
1
Figure 1.  
VDE certificate of conformity  
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12  
Reinforced insulation, VIORM = 848 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  
GENERAL DESCRIPTION  
The ADM2491E is an isolated data transceiver with ±± ꢀk EꢁD  
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 linꢀed externally to receiver input Pin A, and transmitter  
output Pin Z to receiver input Pin B.  
The differential transmitter outputs and receiver inputs feature  
electrostatic discharge circuitry that provides protection to  
±± ꢀk using the human body model (HBM). The logic side of  
the device can be powered with either a 5 k or a 3.3 k supply,  
whereas the bus side requires an isolated 5 k supply.  
The device has current-limiting and thermal shutdown features  
to protect against output short circuits and situations where bus  
contention could cause excessive power dissipation.  
The ADM2491E is designed for balanced transmission lines  
and complies with ANꢁI TIA/EIA Rꢁ-4±5-A-199± and IꢁO  
±4±2: 19±7(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 pacꢀage.  
The ADM2491E is available in a wide body, 16-lead ꢁOIC  
pacꢀage and operates over the −40°C to +±5°C temperature  
range.  
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 registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2007 Analog Devices, Inc. All rights reserved.  
 
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