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参数资料
| 型号： | ADM208E |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | RS-232 Line Drivers/Receivers(15kV ESD保护,RS-232线驱动器/接收器) |
| 中文描述： | RS - 232线驱动器/接收器（15kV的ESD保护和RS - 232线驱动器/接收器） |
| 文件页数： | 13/16页 |
| 文件大小： | 225K |
| 代理商： | ADM208E |
ADM206E/ADM207E/ADM208E/ADM211E/ADM213E
REV. B
–13–
Conducted emissions are measured by monitoring the line
power supply. The equipment used consists of a LISN (Line
Impedance Stabilizing Network) which essentially presents a
fixed impedance at RF, and a spectrum analyzer. The spectrum
analyzer scans for emissions up to 30 MHz and a plot for the
ADM211E is shown in Figure 32.
S1
S2
C1
S4
S3
C3
V+ = 2V
CC
V
CC
INTERNAL
OSCILLATOR
GND
V
CC
Figure 30. Charge Pump Voltage Doubler
1
2
SWITCHING GLITCHES
Figure 31. Switching Glitches
LOG FREQUENCY – MHz
80
70
0
0.3
30
0.6
1
60
50
10
40
30
20
3
6
18
LIMIT
d
m
V
Figure 32. Conducted Emissions Plot
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 which cause conducted emissions
can also be responsible for 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 fre-
quency oscillator and high voltages being switched by the charge
pump. The move towards smaller capacitors in order to con-
serve board space has resulted in higher frequency oscillators
being employed in the charge pump design. This has resulted in
higher levels of emission, both conducted and radiated.
The RS-232 outputs on the ADM2xxE 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.
DUT
TURNTABLE
RADIATED NOISE
ADJUSTABLE
ANTENNA
TO
RECEIVER
Figure 33. Radiated Emissions Test Setup
Figure 34 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 ADM2xxE 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
anechoic chamber.
START 30.0 MHz
STOP 200.0 MHz
LIMIT
d
m
V
80
70
60
50
40
30
20
10
0
Figure 34. Radiated Emissions Plot
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM208EAN | 功能描述:IC TXRX RS-232 5V 0.1UF 24DIP RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| ADM208EANZ | 功能描述:IC TXRX RS-232 5V 0.1UF 24DIP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:RS-232 & USB Transceiver 标准包装:2,000 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SSOP（0.209"，5.30mm 宽） 供应商设备封装:16-SSOP 包装:带卷 (TR) 其它名称:296-19849-2 |
| ADM208EANZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:EMI/EMC-Compliant, ?±15 kV ESDProtected, RS-232 Line Drivers/Receivers |
| ADM208EAR | 功能描述:IC TX/RX RS-232 5V 0.1UF 24SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| ADM208EAR-REEL | 功能描述:IC TXRX RS-232 5V 0.1UF 24SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 V 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-DFN（3x3） 包装:管件 |
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