Datasheet > AN-1109

AN-1109

更新时间： 2024-10-29 12:50:59

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	645K
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Recommendations for Control of Radiated Emissions with iCoupler Devices

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AN-1109 数据手册

AN-1109

APPLICATION NOTE

One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com

Recommendations for Control of Radiated Emissions with iCoupler Devices

by Brian Kennedy and Mark Cantrell

addressing them through high frequency PCB design

techniques.

INTRODUCTION

iCoupler® data isolation products can readily meet CISPR 22

Class A (and FCC Class A) emissions standards, as well as the

more stringent CISPR 22 Class B (and FCC Class B) standards in

an unshielded environment, with proper PCB design choices.

This application note examines PCB-related EMI mitigation

techniques, including board layout and stack-up issues.

Control of emissions from signal cables and chassis shielding

techniques are outside of the scope of this application note.

EMI MITIGATION OVERVIEW

Best-practice techniques for EMI mitigation include a

combination of the use of input-to-output ground plane

stitching capacitance, edge guarding, and the reduction of

supply voltage levels for noise reduction. For the purposes

of this application note, a 4-layer board was designed and

manufactured using materials and structures well within

industry practice.

Several standards for radiated emissions exist. In the U.S., the

Federal Communications Commission (FCC) controls the

standards and test methods. In Europe, the International

Electrotechnical Commission (IEC) generates standards, and

CISPR test methods are used for evaluating emissions. The

methods and pass/fail limits are slightly different under the two

standards. Although this application note references IEC stand-

ards, all results are applicable to both standards.

The EMI reduction examples used in this application note are

based on the 4-channel iCoupler products, but the information

is relevant to all the iCoupler product families, examples of which

are shown in Figure 1.

Data transitions at the input of iCoupler digital isolators are

encoded as narrow pulses that are used to send information

across the isolation barrier. These 1 ns pulses have peak

currents of up to 70 mA and may cause radiated emissions and

conducted noise if not considered during printed circuit board

(PCB) layout and construction. This application note identifies

the radiation mechanisms and offers specific guidance on

For information on reducing emissions from products using

isoPower, integrated isolated power, refer to the AN-0971

Application Note, which includes additional recommendations

and techniques.

ADuM14xx, ADuM24xx,

ADuM34xx, ADuM44xx,

ADuM744x

ADuM13xx, ADuM33xx

ADuM12xx, ADuM22xx,

ADuM32xx

ADuM1100, ADuM3100

Figure 1. Example of iCoupler Device Families

Rev. 0 | Page 1 of 20

12 3 4 5 6 7...20

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