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ADM202EAN датащи(PDF) 13 Page - Analog Devices |
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ADM202EAN датащи(HTML) 13 Page - Analog Devices |
13 / 16 page ADM202E/ADM1181A Rev. C | Page 13 of 16 LOG FREQUENCY (MHz) 80 70 0 0.3 30 0.6 1 60 50 10 40 30 20 10 LIMIT 36 Figure 25. ADM202E Conducted Emissions RADIATED EMISSIONS Radiated emissions are measured at frequencies in excess of 30 MHz. RS-232 outputs are designed for operation at high baud rates, while driving cables can radiate high frequency EM energy. The previously described causes of conducted emissions can also cause radiated emissions. Fast RS-232 output transitions can radiate interference, especially when lightly loaded and driving unshielded cables. Charge-pump devices are also prone to radiating noise due to the high frequency oscillator and the high voltages being switched by the charge pump. The move toward smaller capacitors to conserve board space has resulted in higher frequency oscillators in the charge-pump design, causing higher levels of conducted and radiated emissions. The RS-232 outputs on the ADM202E feature a controlled slew rate to minimize the level of radiated emissions, yet they are fast enough to support data rates of up to 230 kBaud. Figure 27 shows radiated emissions vs. frequency. The levels of emissions are well within specifications without the need for additional shielding or filtering components. The ADM202E was operated at maximum baud rates and configured like a typical RS-232 interface. Testing for radiated emissions was carried out in a shielded anechoic chamber. TURNTABLE DUT RADIATED NOISE ADJUSTABLE ANTENNA TO RECEIVER Figure 26. Radiated Emissions Test Setup START 30.0MHz STOP 200.0MHz LIMIT 80 70 60 50 40 30 20 10 0 Figure 27. ADM202E Radiated Emissions vs. Frequency |
Аналогичный номер детали - ADM202EAN |
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Аналогичное описание - ADM202EAN |
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