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LT1713 Datasheet(PDF) 11 Page - Linear Technology |
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LT1713 Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page 11 LT1713/LT1714 TYPICAL APPLICATIO S Simultaneous Full Duplex 75Mbaud Interface with Only Two Wires The circuit of Figure 3 shows a simple, fully bidirectional, differential 2-wire interface that gives good results to 75Mbaud, using the LT1714. Eye diagrams under condi- tions of unidirectional and bidirectional communication are shown in Figures 4 and 5. Although not as pristine as the unidirectional performance of Figure 4, the perfor- mance under simultaneous bidirectional operation is still excellent. Because the LT1714 input voltage range ex- tends 100mV beyond both supply rails, the circuit works with a full ±3V (one whole VS up or down) of ground potential difference. The circuit works well with the resistor values shown, but other sets of values can be used. The starting point is the characteristic impedance, ZO, of the twisted-pair cable. The input impedance of the resistive network should match the characteristic impedance and is given by: RR RR R RR R R IN O O = + ++ [] 2 12 3 21 2 3 •• ||( ) •||( ) This comes out to 120 Ω for the values shown. The Thevenin equivalent source voltage is given by: VV RR R RRR R RR R R TH S O O = + ++ ++ [] • (– ) () • •||( ) 23 1 23 1 21 2 3 – + 1/2 LT1714 TxD RxD 7 8 9 LE 6 5 49.9 Ω 750k 750k 100k 100k 49.9 Ω 2 1 15 3 16 13 14 3V 3V 4 11 12 R2A 2.55k R3A 124 Ω ROA 140 Ω ROB 140 Ω R1B 499 Ω 6-FEET TWISTED PAIR ZO ≈ 120Ω R1D 499 Ω R1C 499 Ω R3B 124 Ω R2C 2.55k 3V 100k 5 11 2 1 12 6 10 9 8 7 171314 F03 14 3 15 16 13 4 TxD RxD 3V R3C 124 Ω R3D 124 Ω R2D 2.55k R2B 2.55k R1A 499 Ω 10 – + 1/2 LT1714 LE – + 750k 750k 49.9 Ω 49.9 Ω 100k – + LE 1/2 LT1714 LE 1/2 LT1714 3V 3V DIODES: BAV99 ×4 Figure 3. 75Mbaud Full Duplex Interface on Two Wires |
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