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ADM1181 データシート(PDF) 10 Page - Analog Devices |
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ADM1181 データシート(HTML) 10 Page - Analog Devices |
10 / 12 page ADM202E/ADM1181A –10– REV. 0 RADIATED EMISSIONS Radiated emissions are measured at frequencies in excess of 30 MHz. RS-232 outputs designed for operation at high baud rates while driving cables can radiate high frequency EM energy. The reasons already discussed that cause conducted emissions can also be responsible for radiated emissions. Fast RS-232 out- put 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 high voltages being switched by the charge pump. The move towards smaller capacitors in order to conserve board space has resulted in higher frequency oscillators being em- ployed in the charge pump design. This has resulted in higher levels of emission, both conducted and radiated. The RS-232 outputs on the ADM202E products feature a con- trolled slew rate in order to minimize the level of radiated emis- sions, yet are fast enough to support data rates up to 230 kBaud. Figure 21 shows a plot of radiated emissions vs. frequency. This shows that the levels of emissions are well within specifications without the need for any additional shielding or filtering compo- nents. The ADM202E was operated at maximum baud rates and configured as in a typical RS-232 interface. Testing for radiated emissions was carried out in a shielded anechonic chamber. TURNTABLE DUT RADIATED NOISE ADJUSTABLE ANTENNA TO RECEIVER Figure 20. Radiated Emissions Test Setup START 30.0 MHz STOP 200.0 MHz LIMIT 80 70 60 50 40 30 20 10 0 Figure 21. ADM202E Radiated Emissions Plot |
同様の部品番号 - ADM1181 |
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同様の説明 - ADM1181 |
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