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ADM3491_15

更新时间： 2024-11-21 01:04:43
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亚德诺 - ADI /
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20页 328K
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Full-Duplex, RS-485/RS-422 Transceivers

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3.3 V Slew Rate Limited, Half- and  
Full-Duplex, RS-485/RS-422 Transceivers  
Data Sheet  
ADM3483/ADM3485/ADM3488/ADM3490/ADM3491  
FEATURES  
FUNCTIONAL BLOCK DIAGRAMS  
V
Operate with 3.3 V supply  
Interoperable with 5 V logic  
EIA RS-422 and RS-485 compliant over full  
common-mode range  
Data rate options  
ADM3483/ADM3488: 250 kbps  
CC  
ADM3483/  
ADM3485  
R
RO  
RE  
DE  
DI  
A
B
ADM3485/ADM3490/ADM3491: 10 Mbps  
Half- and full-duplex options  
D
Reduced slew rates for low EMI (ADM3483 and ADM3488)  
2 nA supply current in shutdown mode  
(ADM3483/ADM3485/ADM3491)  
GND  
Figure 1.  
Up to 32 transceivers on the bus  
V
CC  
−7 V to +12 V bus common-mode range  
Specified over the –40°C to +85°C temperature range  
8 ns skew (ADM3485/ADM3490/ADM3491)  
8-lead SOIC and 14-lead SOIC (ADM3491 only) packages  
A
B
R
RO  
ADM3488/  
ADM3490  
APPLICATIONS  
Z
Y
Low power RS-485/RS-422 applications  
Telecom  
DI  
D
Industrial process control  
HVAC  
GND  
Figure 2.  
GENERAL DESCRIPTION  
ADM3491  
The ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 are  
low power, differential line transceivers designed to operate using a  
single 3.3 V power supply. Low power consumption, coupled with a  
shutdown mode, makes the ADM3483/ADM3485/ADM3488/  
ADM3490/ADM3491 ideal for power-sensitive applications.  
A
B
Z
R
RO  
RE  
DE  
DI  
D
Y
The ADM3488/ADM3490/ADM3491 feature full-duplex com-  
munication, while the ADM3483/ADM3485 are designed for  
half-duplex communication.  
Figure 3.  
The ADM3483/ADM3488 feature slew rate limited drivers that  
minimize EMI and reduce reflections caused by improperly ter-  
minated cables, allowing error-free data transmission at data rates  
up to 250 kbps.  
in the internal driver circuitry during fault conditions, then the  
thermal shutdown circuit forces the driver output into a high  
impedance state. If the inputs are unconnected (floating), the  
receiver contains a fail-safe feature that results in a logic high  
output state. The parts are fully specified over the commercial  
and industrial temperature ranges. The ADM3483/ADM3485/  
ADM3488/ADM3490 are available in 8-lead SOIC_N; the  
ADM3491 is available in a 14-lead SOIC_N.  
The ADM3485/ADM3490/ADM3491 transmit at up to 10 Mbps.  
The receiver input impedance is 12 kΩ, allowing up to 32 trans-  
ceivers to be connected on the bus. A thermal shutdown circuit  
prevents excessive power dissipation caused by bus contention or  
by output shorting. If a significant temperature increase is detected  
Rev. E  
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  
www.analog.com  
Fax: 781.461.3113 ©2005-2011 Analog Devices, Inc. All rights reserved.  
 
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