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ISO485 Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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ISO485 Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 11 page 8 ® ISO485 1 we can see that the specified attenuation figures given agree with those obtained by measurement; approximately –1.3db/100ft, at 30Mbit/s (15MHz). pattern is clear. In practice a precision decade resistance box was used to determine the exact value of ZT to use. As the data rate is increased we can see from Figure 3 how the signal distortion also increases. From the graph in Figure TYPICAL ELECTRICAL CHARACTERISTICS Capacitance ALPHA WIRE CORP. CDR. to CDR. CDR. to (CDR. AND SHIELD) VP. Z0 at 1MHz, NO. pF/ft (pF/m) pF/ft pF/m) % Ω 6072C 8.7 (28, 5) 5.9 (52, 2) 80 150 6073C thru 6079/27C 12.5 (41, 0) 22.0 (72, 5) 80 150 TYPICAL ATTENUATION VALUES AT 20°C 10.0 5.0 1.0 0.5 1.0 5.0 10.0 50.0 Frequency (MHz) 6073 - 6079/27 6072 FIGURE 1. Cable Characteristics. PARAMETER EIA-232 RS-432-A RS-422-A RS-485 Mode of Operation Single-Ended Single-Ended Differential Differential Number of Drivers and Receivers 1 Driver 1 Driver 1 Driver 32 Drivers 1 Receiver 10 Receivers 10 Receivers 32 Receivers Maximum Cable Length (m) 15 1200 1200 1200 Maximum Data Rate (bps) 20k 100k 10M 10M Maximum Common-Mode Voltage (V) ±25 ±6 6 to –0.25 12 to –7 Driver Output Loaded ±5 ±3.6 ±2 ±1.5 Levels (V) Unloaded ±15 ±6 ±5 ±5 Driver Load ( Ω) 3k to 7k 450 (min) 100 (min) 60 (min) Driver Slew Rate 30V/ µs (max) External Control NA NA Driver Output Short Circuit 500 to VCC 150 to GND 150 to GND 150 to GND Current Limit (mA) 250 to –7 or 12V Driver Output NA NA NA 12k Resistance Power on High Z state ( Ω) Power off 300 60k 60k 12k Receiver Input Resistance ( Ω) 3 to 7 4 4 12 Receiver Sensitivity ±3V ±200mV ±200mV ±200mV TABLE I. Summary of EIA Interface Standards. |
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