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LMS485ECMX Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LMS485ECMX Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 13 page 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 www.national.com 11 |
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