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参数资料
| 型号： | ADM14196E |
| 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： | 11/13页 |
| 文件大小： | 339K |
| 代理商： | ADM14196E |
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ADM14196E
DATA
TECHNICAL
TURNTABLE
DUT
RADIATED NOISE
ADJUSTABLE
ANTENNA
TO
RECEIVER
Figure 27. Radiated Emissions Test Setup
Figure 28 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 ADM14196E 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.
Figure 28. Radiated Emissions Plot
EN55 022, CISPR22 defines the permitted limits of radiated
and conducted interference from Information Technology (IT)
equipment. The objective of the standard is to minimize the
level of emissions both conducted and radiated.
For ease of measurement and analysis, conducted emissions are
assumed to predominate below 30 MHz and radiated emissions
are assumed to predominate above 30 MHz.
CONDUCTED EMISSIONS
This is a measure of noise which gets conducted onto the
line power supply. Conducted noise can be generated
when device outputs switch, particularly if the P-channel
output transistor switches on before the N-channel device
switches off, or vice versa, drawing large current pulses
from the power supply. Care is taken in the design of the
ADM1485E to ensure that this does not happen.
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 emis-
sions up to 30 MHz and a plot for the ADM14196E is shown in
Figure 26.
Figure 26. 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.
The RS-232 outputs on the ADM14196E products feature a
controlled slew rate in order to minimize the level of radiated
emissions, yet are fast enough to support data rates up to 230
kBaud.
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