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Isolator Application Notes

AB-1: Glossary of Terms (.pdf)
NVE’s acclaimed glossary mixes useful definitions with geeky humor.
AB-2: High Voltage Testing Standards Overview (.pdf)
A description of isolator high-voltage test standards, including VDE 0884-10, IEC 60747-5-5, IEC 61010-1, IEC 60601-1, and UL 1577.
AB-3: Package and Pad Layout Specifications (.pdf)
In addition to meeting JEDEC standards, NVE isolator packages have unique creepage specifications. NVE also recommends pad layouts that avoid compromising isolator creepage and clearance.
AB-4: Isolated Logic Level Shifters (.pdf)
IL700/IL200 Isolators can level-shift between 5 V and 3.3 V logic levels while isolating data.
AB-5: Isolated RS-485 and RS-422 (.pdf)
NVE's unique IL400- and IL3000-Series single-chip isolated transceivers dramatically reduce chip count and board area compared to traditional optocouplers.
AB-6: RS-485 Systems (.pdf)
Practical tips and rules of thumb for making RS-485 systems work.
AB-7: GMR in Isolation (.pdf)
The theory of spintronic giant magnetoresistance (GMR) and its application in NVE’s unique IsoLoop Isolators.
AB-8: Power Supply Bypass Capacitor Selection and Placement (.pdf)
Correct selection and placement of power supply bypass capacitors ensures trouble-free operation for circuit boards with IsoLoop Isolators.
AB-9: Pb-free and Sn/Pb Solder Profiles (.pdf)
This bulletin specifies solder profiles for RoHS-compatible Pb-free isolators as well as traditional Sn/Pb parts.
AB-10: Differential Line Receivers Using IL600-Series Isolators (.pdf)
The unique passive inputs of the IL600-Series Isolators are ideal for direct connection to differential networks such as RS-485 and RS-422. This document shows how to save components and reduce cost.
AB-11: Isolated A/D Converters (.pdf)
This bulletin shows how Isoloop isolators are used to enhance static and dynamic ADC performance through effective digital current steering.
AB-12: IsoLoop Isolators for High-Efficiency Power Control (.pdf)
Isoloop isolators offer important advantages over optical couplers in isolating MOSFETs in H-bridge drivers and DC-DC convertors:
  - 2 nanoseconds typical pulse width distortion to minimize transistor dead time and maximize efficiency
  - Unlimited life and no degradation over time
  - Smaller packages, including two-channel MSOP-8s
AB-13: IsoLoop Isolators Have Low Emissions, Low EMI Susceptibility, and Excellent Magnetic Immunity (.pdf)
IsoLoop Isolators have the best EMC footprint of any isolation technology with extremely low emissions, low EMI susceptibility, and excellent magnetic immunity. This bulletin explains why IsoLoop Isolators have superior performance, and summarizes EMC specifications versus applicable standards.
AB-14: Isolating Data Converters—What’s All the Noise About? (.pdf)
Isolation is a cost-effective way to reduce data converter system noise and increase resolution. This bulletin shows how to achieve “best in class” distortion specs with the correct mix of isolation and appropriate ground plane PCB layers.
AB-15: IL600-Series Isolators for Channel-to-Channel Isolation (.pdf)
Channel-to-channel digital signal isolation is often required in PLCs and similar applications. Traditional optocouplers, however, degrade performance by increasing timing parameters such as PWD, propagation delay, and skew. IL600/IL600A Isolators provide excellent channel-to-channel isolation with little timing degradation.
AB-16: Applications for IL800, IL700, IL200, IL500, and IL600 Series Digital Isolators (.pdf)
One of the most frequently asked questions at the isolator applications desk is “what’s the difference between NVE’s digital isolator families?” This application note sheds some light on the design differences between the various model families, why those differences are important, and where the individual products are best used.
AB-17: Isolated I²S Minimizes Distortion—Reaching Isolated Audio Heaven (.pdf)
This application note is about isolation electronics in high-fidelity digital sound, and in particular, techniques that can be used to reduce the noise floor of any given system. An isolated I²S CD transport with DAC circuit is described.
AB-18: IsoLoop Isolators Have Best-in-Class Endurance Voltage (.pdf)
Endurance voltage is the maximum voltage that can be applied between the input and output pins of an isolator indefinitely without damage. It may be the least well-known high-voltage specification. This bulletin explains different high-voltage specifications, and illustrates an application where endurance voltage is important.
AB-19: PROFIBUS Compliance: A Hardware Design Guide (.pdf)
Hardware design best practices for Profibus DP nodes. Covers three important but sometimes tricky design considerations: isolation, Profibus compatibility, and bus node polarity.
AB-20: NVE’s IL600 Series: The True Optocoupler Alternative (.pdf)
This bulletin describes the features of IL600-Series isolators that make them ideal replacements for optocouplers, including wide input voltage range, no input-side power supply, differential inputs, channel-to-channel isolation, and CMOS or open-drain outputs. The bulletin includes a number of example circuits.
AB-21: Isolated CAN Reference Design (.pdf)
This bulletin describes a complete isolated CAN node including a dc-dc convertor and bus transient voltage protection.
AB-22: IsoLoop Isolators Have Best-in-Class Transient Immunity (.pdf)
This bulletin focuses on isolator transient immunity in floating supply applications, practical measurement techniques for this important parameter, and even how to increase transient immunity for IsoLoop Isolators.
AB-23: NVE Isolators Feature TRUE Eight Millimeter Creepage (.pdf)
An ordinary wide-body package has 7.6 mm typical creepage, but the NVE “True 8” isolator package was custom tooled to meet eight millimeter isolation requirements. Even with worst-case package dimensions and pin placement, the unique package meets the eight millimeter requirements under IEC 60601 250 WV measurement rules.
AB-24: IsoLoop Isolators Have Excellent Thermal Characteristics (.pdf)
Award-winning IsoLoop® Isolators have excellent thermal characteristics, enabling the parts to run at high speed and high ambient temperatures with minimum temperature rises. This provides wide operating margin and contributes to exceptional reliability. This bulletin summarizes IsoLoop thermal specifications, describes how thermal resistance is measured, and gives a representative thermal derating curve.
AB-25: IsoLoop Isolators Enable Next-Generation Switching-Mode Power Supplies (.pdf)
New 2.5 kV MSOP isolators allow denser, more precise, and more reliable Switching-Mode Power Supplies. This bulletin reviews major the evolution of SMPS technology, and examines new isolators that enable better-than-ever power supplies.

NVE makes no representation or warranty that these applications will be suitable for the specified use without further testing or modification. See our Purchase Terms and Conditions.
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