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參數(shù)資料
| 型號： | LMS1487INA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 5V Low Power RS-485 / RS-422 Differential Bus Transceiver |
| 中文描述： | LINE TRANSCEIVER, DIP8 |
| 封裝： | DIP-8 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 249K |
| 代理商： | LMS1487INA |
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.
20053022
FIGURE 11. Placement of by-pass Capacitors, C
bp
L
www.national.com
11
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMS1487IMX | 5V Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS1487IM | 5V Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS1487CNA | 5V Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS1487CMX | 5V Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS1487CM | 5V Low Power RS-485 / RS-422 Differential Bus Transceiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMS1487INA | 制造商:Texas Instruments 功能描述:IC BUS TRANSCEIVER 1487 DIP8 5V |
| LMS1585 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:5A and 3A Low Dropout Fast Response Regulators |
| LMS1585A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:5A and 3A Low Dropout Fast Response Regulators |
| LMS1585ACS-1.5 | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LMS1585ACS-1.5/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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