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參數(shù)資料
| 型號(hào)： | LMS1487ECNA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Low Power RS-485 / RS-422 Differential Bus Transceiver |
| 中文描述： | LINE TRANSCEIVER, DIP8 |
| 封裝： | DIP-8 |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大?。?/td> | 248K |
| 代理商： | LMS1487ECNA |
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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.
20085622
FIGURE 11. Placement of by-pass Capacitors, C
bp
L
www.national.com
11
相關(guān)PDF資料 |
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| LMS1487ECMX | Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS1487 | 5V Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS1487INA | 5V Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS1487IMX | 5V Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS1487IM | 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 |
|---|---|
| LMS1487ECNA/NOPB | 功能描述:TXRX RS422/485 DIFF BUS 8DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:25 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:4.5 V ~ 5.5 V 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:16-PDIP 包裝:管件 |
| LMS1487EIM | 制造商:Texas Instruments 功能描述:RS422/485 5V BUS XCVR 15KV 1487 |
| LMS1487EIM/NOPB | 功能描述:TXRX RS422/485 DIFF BUS 8-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:25 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:4.5 V ~ 5.5 V 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:16-PDIP 包裝:管件 |
| LMS1487EIMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Power RS-485 / RS-422 Differential Bus Transceiver |
| LMS1487EINA | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Power RS-485 / RS-422 Differential Bus Transceiver |
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