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| 型号： | LMS485CM |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 通用总线功能 |
| 英文描述： | RESISTOR |
| 中文描述： | LINE TRANSCEIVER, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 11/13页 |
| 文件大小： | 249K |
| 代理商： | LMS485CM |
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.
20062622
FIGURE 11. Placement of by-pass Capacitors, C
bp
L
www.national.com
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMS485CM | 制造商:Texas Instruments 功能描述:IC BUS TRANSCEIVER SOIC8 5V 485 |
| LMS485CM/NOPB | 功能描述:TXRX 5V RS422/485 DIFF BUS 8SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:25 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:4.5 V ~ 5.5 V 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 供应商设备封装:16-PDIP 包装:管件 |
| LMS485CMX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:5V Low Power RS-485 / RS-422 Differential Bus |
| LMS485CMX/NOPB | 功能描述:TXRX 5V RS422/485 DIFF BUS 8SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:25 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:4.5 V ~ 5.5 V 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 供应商设备封装:16-PDIP 包装:管件 |
| LMS485CNA | 制造商:Texas Instruments 功能描述:IC, BUS TRANSCEIVER, DIP8, 5V, 485 |
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