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ADM3222ARSZ-REEL 데이터시트(PDF) 9 Page - Analog Devices |
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ADM3222ARSZ-REEL 데이터시트(HTML) 9 Page - Analog Devices |
9 / 16 page ADM3202/ADM3222/ADM1385 Rev. E | Page 9 of 16 Transmitter (Driver) Section The drivers convert 3.3 V logic input levels into RS-232 output levels. With VCC = 3.3 V and driving an RS-232 load, the output voltage swing is typically ±6 V. Receiver Section The receivers are inverting level-shifters that accept RS-232 input levels and translate them into 3 V logic output levels. The inputs have internal 5 kΩ, pull-down resistors to ground and are protected against overvoltages up to ±30 V. Unconnected inputs are pulled to 0 V by the internal 5 kΩ, pull-down resistor. This results in a Logic 1 output level for unconnected inputs or for inputs connected to GND. The receivers have Schmitt-trigger inputs with a hysteresis level of 0.4 V. This ensures error-free reception for both noisy inputs and for inputs with slow transition times. HIGH BAUD RATE The ADM3202/ADM3222 feature high slew rates permitting data transmission at rates well in excess of the EIA/RS-232E specifications. RS-232 voltage levels are maintained at data rates up to 460 kbps even under worst-case loading conditions. This allows high speed data links between two terminals and is suitable for the new generation ISDN modem standards that require data rates of 230 kbps. The slew rate is internally controlled to less than 30 V/μs to minimize EMI interference. |
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