ELECTRICAL CHARACTERISTICS OF LOW VOLTAGE DIFFERENTIAL SIGNALING
(LVDS) INTERFACE CIRCUITS
(From TIA/EIA Standard TIA/EIA-644 and Standards Proposal
No. 4584 formulated under the cognizance of TIA
Subcommittee TR-30.2 on Data Transmission Interfaces and Protocols)
Contents Page
1 SCOPE ................................................................................................................................. 1
2 DEFINITIONS, SYMBOLS AND ABBREVIATIONS ..................................................... 2
2.1 Data signaling rate................................................................................................ 2
2.2 DTE......................................................................................................................... 2
2.3 DCE........................................................................................................................ 2
2.4 LVDS...................................................................................................................... 2
2.5 Star (*) .................................................................................................................... 2
3 APPLICABILITY................................................................................................................... 3
3.1 General applicability............................................................................................. 3
3.2 Data signaling rate................................................................................................ 3
4 ELECTRICAL CHARACTERISTICS............................................................................... 5
4.1 Generator characteristics..................................................................................... 5
4.1.1 Full load test measurements............................................................................... 6
4.1.2 Offset voltage and balance measurements........................................................ 7
4.1.3 Short-circuit measurements................................................................................. 8
4.1.4 Output signal waveform ........................................................................................ 8
4.1.5 Dynamic output signal balance............................................................................ 9
4.2 Load characteristics ...........................................................................................10
4.2.1 Receiver input current - voltage measurements...............................................11
4.2.2 Receiver input balance measurements ............................................................11
4.2.3 Terminating receiver input current - voltage measurements and input
impedance measurements ................................................................................12
4.2.4 Receiver input sensitivity measurements .........................................................14
4.2.5 Media termination...............................................................................................15
4.3 Interconnecting media electrical characteristics..............................................16
4.3.1 Cable media........................................................................................................17
4.3.1.1 Maximum dc loop resistance (DCR):................................................................17
4.3.1.2 Characteristic impedance:.................................................................................17
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