SDAA162 July   2026 ADS125H18 , ISO7721 , ISO7730 , ISO7731 , SN6505B , SN74LVC1G17 , TUSB320 , TVS3301

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Design Overview and Measurement Performance (Normal Operation)
    1. 1.1 Design Overview
    2. 1.2 EMC Test Board Voltage Measurement Performance During Normal Operation
    3. 1.3 EMC Test Board Current Measurement Performance During Normal Operation
  5. 2EMC Test Board Circuit and PCB Layout Considerations
    1. 2.1 Circuit Design Considerations for EMC Compliance
      1. 2.1.1 High-Voltage Capacitors and Resistors on Every Input Connector Pin
      2. 2.1.2 TVS Diodes
      3. 2.1.3 Protecting the Current Shunt: PTC and Zener Diodes
      4. 2.1.4 Series Resistors on Digital Signals
      5. 2.1.5 Digital Isolation
      6. 2.1.6 Power Supply and Protection
      7. 2.1.7 High-Voltage Capacitors and Resistors for Discharging Path
    2. 2.2 PCB Layout Considerations for EMC Compliance
      1. 2.2.1 PCB Layer Stack-up and Ground Plane
      2. 2.2.2 Avoiding a Long Return Path
      3. 2.2.3 Avoiding 90-Degree Bends in PCB Traces
      4. 2.2.4 Using a Guard Ring to Isolate Interference Signals
      5. 2.2.5 Decoupling Capacitors
      6. 2.2.6 Differential Signal Routing
      7. 2.2.7 Stitching Vias
      8. 2.2.8 Layout for Isolation Barrier
      9. 2.2.9 Component Placement
  6. 3EMC Test System, Standards, and Results
    1. 3.1 EMC Test System
    2. 3.2 EMC Test Standards
    3. 3.3 EMC Test Results
      1. 3.3.1 Electrostatic Discharge (ESD)
      2. 3.3.2 Radiated Immunity (RI)
      3. 3.3.3 Electrical Fast Transients (EFT)
      4. 3.3.4 Surge Immunity (SI)
      5. 3.3.5 Conducted Immunity (CI)
  7. 4Schematic, PCB Layout and Bill of Materials
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials (BOM)
  8. 5Summary
  9. 6References

3.3 EMC Test Results

This document describes five IEC 61000-4-x tests. Review detailed information about how the ADS125H18 EMC test board perfomed by clicking on the links in the following list:

Table 3-2 summarizes the results from all tests for quick reference:

Table 3-2 Summary of ADS125H18 EMC Test Board Results
Test IEC Standard Description Test Conditions Criterion Test Result
ESD IEC 61000-4-2 Contact Discharge (HCP/VCP) ±8kV A Pass
±15kV A Pass
Contact Discharge (shield guard screws) ±4kV A Pass
±6kV C USB communication failed
RI IEC 61000-4-3 20V/m 80MHz -1GHz (Horizontal & Vertical) A Pass
A Pass
1GHz -2.7GHz (Horizontal & Vertical) A Pass
A Pass
EFT IEC 61000-4-4 Voltage Input ±4kV | 5kHz A Pass
±4kV | 100kHz A Pass
Current Input ±4kV | 5kHz A Pass
±4kV | 100kHz A Pass
DC Port ±4kV | 5kHz C USB communication failed
±4kV | 100kHz C USB communication failed
DC Port ±3kV | 5kHz A Pass
±3kV | 100kHz A Pass
SI(1)

IEC 61000-4-5

 Voltage Input 500V B Pass
1000V B Pass
Current Input 500V B Pass
1000V B Pass
DC input 500V B Pass
1000V B Pass
CI IEC 61000-4-6 Voltage Input 20V/m (Level >3) from 150kHz-80MHz A Pass
Current Input A Pass
DC Port A Pass
Earth Line A Pass
(1) Line-to-ground (2Ω source impedance + 40Ω from coupling network) and line-to-line (2Ω source impedance on DC input)