AN-960 查看數據表（PDF） - Analog Devices
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AN-960 Datasheet PDF : 12 Pages
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AN-960
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
APPLICATION NOTE
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
Rev. 0 | Page 2 of 12
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