AN-2020
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
An EMC Robust PCB Design Based on the AD7606B ADC for Power Automated
Applications
by Ken Ye and Lluis Beltran Gil
Rev. 0 | Page 1 of 9
INTRODUCTION
The AD7606B is a 16-bit, simultaneous sampling, analog-to-digital
data acquisition system (DAS) with eight channels. Each channel
contains a successive approximation register (SAR), analog-to-
digital converter (ADC). The AD7606B is designed to be used in
power automation systems such as protection relay systems,
merging unit systems, and other secondary power automation
devices in harsh environments. For these systems, electromagnetic
compatibility (EMC) design is a top priority.
This application note provides an EMC board level design and
a guide for using the AD7606B as a standard analog front end
(AFE) for interfacing the current and voltage sensing circuits.
AN-2020 Application Note
Rev. 0 | Page 2 of 9
TABLE OF CONTENTS
Introduction ...................................................................................... 1
Revision History ............................................................................... 2
Typical Use Case of the AD7606B in a Power Automated
System ................................................................................................ 3
EMC Standards ................................................................................. 4
IEC 61000-4-2: Electrostatic Discharge (ESD) ......................... 4
IEC 61000-4-4: Electrical Fast Transient (EFT)/Burst
Transient ........................................................................................ 4
IEC 61000-4-5: Surge ................................................................... 4
Possible ADC Failures During EMC Testing .................................5
EMC Testing PCB Functions and System Description ................6
Analog Input Protection Circuit .................................................6
Circuit Layout Considerations ....................................................6
EMC Testing .......................................................................................9
ESD Testing ....................................................................................9
EFT/Burst Testing .........................................................................9
Surge Testing ..................................................................................9
REVISION HISTORY
11/2019—Revision 0: Initial Version