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參數(shù)資料
| 型號(hào)： | LMS485E |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | RS-485 |
| 英文描述： | Low Power RS-485 / RS-422 Differential Bus Transceiver |
| 中文描述： | 低功耗RS - 485 / RS - 422差分總線收發(fā)器 |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大小： | 248K |
| 代理商： | LMS485E |
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Application Information
POWER LINE NOISE FILTERING
A factor to consider in designing power and ground is noise
filtering. A noise filtering circuit is designed to prevent noise
generated by the integrated circuit (IC) as well as noise
entering the IC from other devices. A common filtering
method is to place by-pass capacitors (C
bp
) between the
power and ground lines.
Placing a by-pass capacitor (C
bp
) with the correct value at
the proper location solves many power supply noise prob-
lems. Choosing the correct capacitor value is based upon
the desired noise filtering range. Since capacitors are not
ideal, they may act more like inductors or resistors over a
specific frequency range. Thus, many times two by-pass
capacitors may be used to filter a wider bandwidth of noise.
It is highly recommended to place a larger capacitor, such as
10μF, between the power supply pin and ground to filter out
low frequencies and a 0.1μF to filter out high frequencies.
By-pass capacitors must be mounted as close as possible to
the IC to be effective. Longs leads produce higher imped-
ance at higher frequencies due to stray inductance. Thus,
this will reduce the by-pass capacitor’s effectiveness. Sur-
face mounted chip capacitors are the best solution because
they have lower inductance.
20086622
FIGURE 11. Placement of by-pass Capacitors, C
bp
L
www.national.com
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMS485ECM | 制造商:Texas Instruments 功能描述:LO POWER 5V RS422/485 XCVR 15KV485 |
| LMS485ECMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS485ECNA | 制造商:Texas Instruments 功能描述:IC LO POWER 5V RS422/485 XCVR 15KV |
| LMS485ECNA/NOPB | 制造商:Texas Instruments 功能描述:Single Transmitter/Receiver RS-422/RS-485 8-Pin PDIP Rail |
| LMS485EIM | 制造商:Texas Instruments 功能描述:LO POWER 5V RS422/485 XCVR 15KV 485 |
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