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LTC490 Fiches technique(PDF) 5 Page - Linear Technology |
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LTC490 Fiches technique(HTML) 5 Page - Linear Technology |
5 / 8 page 5 LTC490 Figure 4. Receiver Propagation Delays Figure 3. Driver Propagation Delays TI E WAVEFOR S G WITCHI S S APPLICATI I FOR ATIO Typical Application A typical connection of the LTC490 is shown in Figure 5. Two twisted-pair wires connect two driver/receiver pairs for full duplex data transmission. Note that the driver and receiver outputs are always enabled. If the outputs must be disabled, use the LTC491. There are no restrictions on where the chips are con- nected, and it isn’t necessary to have the chips connected at the ends of the wire. However, the wires must be terminated only at the ends with a resistor equal to their characteristic impedance, typically 120 Ω. Because only Figure 5. Typical Connection LTC490 • TA06 120 Ω 120 Ω SHIELD LTC490 DRIVER RECEIVER LTC490 DRIVER DX RX DX RX 2 3 5 6 7 8 RECEIVER + 0.01 µF 1 4 5V SHIELD 8 7 6 5 + 0.01 µF 5V 4 2 3 1 VOL LTC490 • TA05 A-B VOD2 0V tPLH 0V OUTPUT VOH 1.5V f = 1MHz ; tr ≤ 10ns : tf ≤ 10ns tPHL –VOD2 1.5V INPUT R –VO LTC490 • TA04 D 3V 0V 1.5V tPLH 1.5V VDIFF = V(Y) – V(Z) VO 80% 20% 50% 10% Z Y tSKEW tr f = 1MHz : tr ≤ 10ns : tf ≤ 10ns 90% 50% tPHL tf VO tSKEW 1/2 VO 1/2 VO |
Numéro de pièce similaire - LTC490 |
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Description similaire - LTC490 |
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