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ADM202EAN 参数 Datasheet PDF下载

ADM202EAN图片预览
型号: ADM202EAN
PDF下载: 下载PDF文件 查看货源
内容描述: EMI / EMC兼容, ±15千伏ESD保护, RS - 232线路驱动器/接收器 [EMI/EMC Compliant, +-15 kV ESD Protected, RS-232 Line Drivers/Receivers]
分类和应用: 驱动器
文件页数/大小: 12 页 / 166 K
品牌: ADI [ ADI ]
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ADM202E/ADM1181A  
RADIATED NOISE  
RAD IATED EMISSIO NS  
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.  
T he 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. T he  
move towards smaller capacitors in order to conserve board  
space has resulted in higher frequency oscillators being em-  
ployed in the charge pump design. T his has resulted in higher  
levels of emission, both conducted and radiated.  
DUT  
TO  
RECEIVER  
ADJUSTABLE  
ANTENNA  
TURNTABLE  
Figure 20. Radiated Em issions Test Setup  
80  
70  
T he 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.  
60  
50  
40  
30  
20  
10  
0
LIMIT  
Figure 21 shows a plot of radiated emissions vs. frequency. T his  
shows that the levels of emissions are well within specifications  
without the need for any additional shielding or filtering compo-  
nents. T he ADM202E was operated at maximum baud rates  
and configured as in a typical RS-232 interface.  
T esting for radiated emissions was carried out in a shielded  
anechonic chamber.  
START 30.0 MHz  
STOP 200.0 MHz  
Figure 21. ADM202E Radiated Em issions Plot  
REV. 0  
–10–