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ADM3070E 产品设计参考手册 - ADI（亚德诺）
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ADI（亚德诺）
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3.3 V ， 【 15千伏ESD保护，半双工和全双工， RS - 485 / RS -422收发器 3.3 V, 【15 kV ESD-Protected, Half- and Full-Duplex, RS-485/RS-422 Transceivers
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ADM3070E数据手册
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AN-960 APPLICATION NOTE
Rev. 0 | Page 2 of 12
TABLE OF CONTENTS
Introduction ...................................................................................... 1
Why Use Differential Data Transmission? .................................... 1
RS-485 or RS-422? ............................................................................ 3
RS-422 ................................................................................................ 3
RS-485 and the Unit Load Concept ............................................... 3
Half-Duplex RS-485 ......................................................................... 4
Full-Duplex RS-485 .......................................................................... 4
Termination ....................................................................................... 5
No Termination ........................................................................ 5
Parallel Termination................................................................. 5
AC Termination .........................................................................5
Stub Length ................................................................................5
Data Rate and Cable Length ........................................................5
Fail-Safe Biasing .................................................................................6
Differential Input Threshold Voltage of a Receiver ..............6
Open Fail-Safe ...........................................................................6
True Fail-Safe Receivers ...........................................................7
Isolation ..............................................................................................8
Transient Overvoltage Stress Protection ........................................9
References ...........................................................................................9
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