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RS422 Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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RS422 Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 3 page www.fairchildsemi.com 2 Compatibility with RS-422 and RS-485 Standards (Continued) FIGURE 1. Driver Output Levels FIGURE 2. Application of RS-422 Data to an LVDS Receiver The R1, R2, and R3 resistor divider network collectively is a total differential load of 100 Ω to match the characteristic impedance of the transmission line and reduces the typical RS-422 differential signal amplitude of 3.3V down to a 330mV level. Essentially, the resistor network is a 10:1 attenuation circuit. Refer to the equation below to calculate the voltage drops across the resistors. The majority (90%) of the RS-422 voltage is dropped across resistors R1 and R2, leaving the remaining voltage to be dropped across R3 which is compatible to the LVDS receiver. ITOT = VTOT/RTOT (Current through the resistor network) = 3.3V / (R1 + R2 = R3) = 3.3V / 100Ω = 33 mA (Voltage across R1) (Voltage across R2) (Voltage across R3) V1 = I TOT * R1 V2 = I TOT * R2 V3 = I TOT * R3 = (33mA)(45Ω) = (33mA)(45Ω) = (33mA)(10Ω) = 1.485V = 1.485V = 330mV |
Similar Part No. - RS422 |
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Similar Description - RS422 |
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