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參數(shù)資料
| 型號： | ADM1181 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收發(fā)器與0.1uF電容 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 163K |
| 代理商： | ADM1181 |
ADM202E/ADM1181A
–10–
REV. 0
RADIAT E D E MISSIONS
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.
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.
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.
TURNTABLE
DUT
RADIATED NOISE
ADJUSTABLE
ANTENNA
TO
RECEIVER
Figure 20. Radiated Emissions Test Setup
START 30.0 MHz
STOP 200.0 MHz
LIMIT
d
80
70
60
50
40
30
20
10
0
Figure 21. ADM202E Radiated Emissions Plot
相關PDF資料 |
PDF描述 |
|---|---|
| ADM1181A | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| ADM202EAN | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| ADM202EARN | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| ADM202EARU | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| ADM1181AAN | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADM1181A | 制造商:AD 制造商全稱:Analog Devices 功能描述:EMI/EMC Compliant, +-15 kV ESD Protected, RS-232 Line Drivers/Receivers |
| ADM1181AAN | 功能描述:IC TXRX RS-232 5V 15KV 16DIP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 規(guī)程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN（3x3） 包裝:管件 |
| ADM1181AANZ | 功能描述:IC TXRX RS-232 5V 15KV 16-DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 規(guī)程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN（3x3） 包裝:管件 |
| ADM1181AARW | 功能描述:IC TXRX RS-232 5V 15KV 16SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):1/1 規(guī)程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN（3x3） 包裝:管件 |
| ADM1181AARW-REEL | 制造商:Analog Devices 功能描述:Dual Transmitter/Receiver RS-232 16-Pin SOIC W T/R |
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