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參數(shù)資料
| 型號： | LMS1485MX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 5V Low Power RS-485 Differential Bus Transceiver |
| 中文描述： | LINE TRANSCEIVER, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 9/10頁 |
| 文件大小： | 224K |
| 代理商： | LMS1485MX |
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. Long leads produce higher impedance
at higher frequencies due to stray inductance. Thus, this will
reduce the by-pass capacitor’s effectiveness. Surface
mounted chip capacitors are the best solution because they
have lower inductance.
20048824
FIGURE 11. Placement of by-pass Capacitors, C
bp
L
www.national.com
9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMS1487 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:5V Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS1487CM | 制造商:Texas Instruments 功能描述:BUS TRANSCEIVER 1487 SOIC8 5V |
| LMS1487CM | 制造商:Texas Instruments 功能描述:BUS TRANSCEIVER 1487 SOIC8 5V |
| LMS1487CM/NOPB | 制造商:Texas Instruments 功能描述: |
| LMS1487CMX | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
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