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LTC1348 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1348 Datasheet(HTML) 7 Page - Linear Technology |
7 / 8 page 7 LTC1348 APPLICATIONS INFORMATION DRIVER OUTPUT RECEIVER OUTPUT DRIVER INPUT LTC1348 G06 DRIVER OUTPUT RECEIVER OUTPUT DRIVER INPUT LTC1348 G07 LT1348 • F05 0.1 µF 0.1 µF 0.1 µF 0.1 µF LTC1348 1 2 3 4 5 6 7 8 9 10 11 12 13 14 RX1 IN RX2 IN RX3 IN RX4 IN RX5 IN 28 27 26 25 24 23 22 21 20 19 18 17 16 15 DR1 IN RX1 OUT DR2 IN RX2 OUT RX3 OUT RX4 OUT DR3 IN RX5 OUT DREN RXEN V– V+ VCC GND 0.1 µF 0.1 µF 1000pF 0.1 µF 0.1 µF 0.1 µF LTC1348 1 2 3 4 5 6 7 8 9 10 11 12 13 14 DR1 OUT DR2 OUT RX3 IN RX4 IN DR3 OUT 28 27 26 25 24 23 22 21 20 19 18 17 16 15 DRIVER 1 IN RX1 OUT DRIVER 2 IN RX2 OUT RX3 OUT RX4 OUT DRIVER 3 IN RX5 OUT DREN RXEN V– V+ VCC GND 0.1 µF DR1 OUT DR2 OUT RX5 IN DR3 OUT RX1 IN 1000pF 1000pF RX2 IN C2+ C3+ C3– C3+ C3– C2– C1+ C1– C2+ C2– C1+ C1– Figure 5. Data Rate Evaluation Circuit Figure 6. Driver Test Result at 120kbps Figure 7. Driver Test Results at 250kbps Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. High Data Rates The LTC1348 maintains true RS232 ±5V minimum driver output even at high data rates. Figure 5 shows a test circuit with 2m wires connecting the two test chips. Both chips are run from 3.3V supplies. Figure 6 shows the typical line waveforms with all three drivers, loaded with 1000pF and 3k Ω,togglingsimultaneouslyat120kbaud.Figure7shows the same circuit with a single 1000pF/3k Ω loaded driver driven at 250kbaud, and the other two drivers loaded but not toggling. This closely approximates the actual behav- ior of an RS232 serial port, with only one driver (TX) driven at high speed and the other two drivers (RTS and DTR) driven at a relatively low data rate or at DC. Under the same conditions, the LTC1348 can go as fast as 350kbaud and still meet EIA562 ( ±3.7V) minimum driver output levels. |
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Similar Description - LTC1348 |
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