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LTC1689 Datasheet(PDF) 8 Page - Linear Technology |
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LTC1689 Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LTC1688/LTC1689 16889fa Cable Termination The recommended cable termination for use with the LTC1688/LTC1689 is a single resistor across the two ends of a transmission cable (see Figure 8). When PC traces are used as the transmission line, its characteristic imped- ance should be chosen close to 100 Ω in order to better match the specified timing characteristics of the LTC1688/ LTC1689. Category 5 unshielded twisted pair can be used over short distances at the maximum data rates (100Mbps). For point-to-point configurations (see Figure 9), a single resistor across the cable at the receiver end is sufficient. A single resistor termination lowers power consumption and increases the differential output signal. See Enable Pins section for cable terminations with a DC bias. APPLICATIONS INFORMATION Enable Pins For cable terminations with a DC bias (such as High Voltage Differential SCSI, see Figure 10), the driver out- puts must be disabled for at least 200ns after power-up. This ensures that the driver outputs do not disturb the cable upon power-up. It also ensures the correct output start-up conditions. When there is an output short fault condition and the cable has a DC biased termination, such as Figure 10, the driver outputs must be disabled for at least 200ns after the short has been removed. Recall that for transmission lines that have the recommended RS485 single resistor termination (Figures 8 and 9), the LTC1688/ LTC1689 will come out of a short-circuit fault condition automatically without having to disable the outputs. 1688/89 F10 1/4 LTC1518 150 Ω 330 Ω DE DI 330 Ω 1/4 LTC1688 TERM POWER 150 Ω 330 Ω 330 Ω TERM POWER 1/4 LTC1518 Figure 10. DC-Biased Termination (Recommended for SCSI Applications Only) Figure 8. Multipoint Transmission Figure 9. Point-to-Point Transmission 1688/89 F08 1/4 LTC1518 1/4 LTC1519 100 Ω 100 Ω 1/4 LTC1688 1688/89 F09 1/4 LTC1518 100 Ω 1/4 LTC1689 |
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Similar Description - LTC1689 |
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