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LTC485IN8 Datasheet(PDF) 9 Page - Linear Technology |
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LTC485IN8 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC485 sn 485LTC485ffs APPLICATIO S I FOR ATIO LTC485 Line Length vs Data Rate The maximum line length allowable for the RS422/RS485 standard is 4000 feet. Figures 17 and 18 show that the LTC485 is able to comfortably drive 4000 feet of wire at 110kHz. Figure 14. Line Length Test Circuit TTL OUT LTC485 LTC485 NOISE GENERATOR 100 Ω C D 4000 FT 26AWG TWISTED PAIR A B TTL IN Using the test circuit in Figure 14, Figures 15 and 16 show that with ~ 20VP-P common mode noise injected on the line, The LTC485 is able to reconstruct the data stream at the end of 4000 feet of twisted pair wire. RO DIFFERENTIAL VOLTAGE A – B DI LTC485 • F16 Figure 16. System Differential Voltage at 19.2kHz Figure 15. System Common Mode Voltage at 19.2kHz COMMON MODE VOLTAGE (A + B)/2 RO DI LTC485 • F15 Figure 17. System Common Mode Voltage at 110kHz RO COMMON MODE VOLTAGE (A + B)/2 DI LTC485 • F17 RO COMMON MODE VOLTAGE (A – B) DI LTC485 • F18 Figure 18. System Differential Voltage at 110kHz When specifying line length vs maximum data rate the curve in Figure 19 should be used: Figure 19. Cable Length vs Maximum Data Rate MAXIMUM DATA RATE 10k 10 100 1k 10k 100k 1M 10M LTC485 • F19 2.5M |
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