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LTC1484 数据表(PDF) 13 Page - Linear Technology |
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LTC1484 数据表(HTML) 13 Page - Linear Technology |
13 / 16 page 13 LTC1484 R D 1 1k RO4 DE4 67 2 5 8 5V 34 R D 1 1k RO2 DE2 6 7 120 Ω 2 5 8 5V 5V 3 4 1.2k 1484 F11 1.2k 120 Ω 5V 1.2k 1.2k R D 1 1k RO3 DE3 RO1 DE1 6 7 2 5 8 5V 3 4 R D 1 1k 67 2 5 8 5V 34 receiver output and expects to see perfect agreement between the two data streams. (Note that the driver inverts the data, so the transmitted and received data streams are actually opposites.) If the simultaneously transmitted and received data streams differ (usually detected by compar- ing RO and DE with an XOR), it signals the presence of a second, active driver. The first driver falls silent, and the second driver seizes control. If the LTC1484 is connected as shown in Figure 11, the overhead of XORing the transmitted and received data in hardware or software is eliminated. DE and RE are con- nected together so the receiver is disabled and its output three-stated whenever a “0” is transmitted. A 1k pull-up ensures a “1” at the receiver output during this condition. The receiver is enabled when the driver is disabled. During this interval the receiver output should also be “1”. Thus, under normal operation the receiver output is always “1”. If a “0” is detected, it indicates the presence of a second active driver attempting to seize control of communica- tions. The maximum frequency at which the system in Figure 11 can operate is determined by the cable capacitance, the values of the pull-up and pull-down resistors and receiver propagation delay. The external resistors take a longer time to pull the line to a “1” state due to higher source resistance compared to an active driver, thereby affecting the duty cycle of the receiver output at the far end of the line. Figure 11. Transmit “0” CDMA Application APPLICATIONS INFORMATION (b) Figure 12a shows a 100kHz DE1 waveform for an LTC1484 driving a 1000-foot shielded twisted-pair (STP) cable and the A2, B2 and RO2 waveforms of a receiving LTC1484 at the far end of the cable. The propagation delay between DE1 of the driver and RO2 at the far end of the line is 1.8 µs at the rising edge and 3.7 µs at the falling edge of DE1. The (a) Figure 12. LTC1484 Driving a 1000 Foot STP Cable 1484 F12a 1484 F12b B2 A2 RO2 DE1 DE1 B2 A2 RO2 |
类似零件编号 - LTC1484 |
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类似说明 - LTC1484 |
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