Analog Devices
Webinar Date: May 22, 2025
Key Takeaways
- The impact of additive jitter from digital isolation on precision measurement systems.
- How to determine the maximum SPI speed supported by a digital isolator.
- The effects of digital isolation on critical ADC performance metrics and best practices for mitigating these impacts.
ADuM34xE Quad Digital Isolators
MAX22664/MAX22665 Isolators
ADN4624 Series Isolators
AD4630-24 Analog-to-Digital
Analog Devices Inc Distributor
Frequently Asked Questions
What are some examples of precision signal chains that might require isolation?
- One example would be a current sensor for a motor in an industrial application. Here you would want to isolate the sensor from any sensitive control circuity or human interfaces for safety reasons and increased robustness. Another could be an automated test equipment application where you might want to isolate the analog side from noisy digital signals from a FPGA?
What other specifications are important when comparing digital isolators?
- There are a few more isolator specifications which can be important to consider, depending on the requirements of your application. Specifications such as Common Mode Transient Immunity (CMTI), min/max input/output voltage level, electromagnetic emissions, and isolation voltage can each be significant factors in choosing the right isolator for your application.
How do you supply power to both sides of the isolation barrier while keeping them isolated?
- Isolated power devices are used to transmit power across an isolation barrier while maintaining isolation. Analog Devices provides a wide range of isoPower devices which allows you to choose the best option based on the requirements of your application, be they PCB area, noise, or high-power.
What about isolated ADCs?
- Analog Devices also has a portfolio of isolated ADCs. These products combine a digital isolator, a sigma delta ADC, and sometimes even isolated power, into one package. Therefore, they are ideal for space constrained applications.
How have newer digital isolators improved upon previous generations?
- The performance of digital isolators has improved significantly over the years. Current generation digital isolators have significantly higher data rates, lower jitter, and lower power consumption than their predecessors. This makes them better suited than ever for precision signal chain applications.
Beyond high-level PCB routing suggestions, does Analog devices provide detailed PCB routing app notes for their devices in order to minimize board level crosstalk and signal integrity issues.
- Yes, there is a wide range of documentation on their website.
How useful is digital isolation without galvanic isolation of the power supply rails and grounds?
- It is very useful, from a noise point of view separating the interface.
Is there any material to learn about the correct selection of the passive components required implementing this? (Like the resistors, if those need to be pulse resistant, or safety capacitors?
- There are no requirements as far as the correct selection of passive components. There are application notes available for reference.
Do isolated ADC emit EMI on the input side?
- ADI’s isolated ADCs are designed to meet CISPR32 Class B emissions. Are you referring to an isolated signal chain as presented or our range of Isolated ADC’s
Are there any isolated power supply solutions that are available?
- Depending on your application if you’re not providing too much power and are interested in the PCB area, we have integrated data and power within one device that transfers across one package. We have other devices that provide more power, with an integrated driver and transformer package. We also have isolated transformer drivers.
Is there an evaluation board you could suggest using to do the power isolation?
- There are a lot of evaluation boards. If you go to the isolation power area on the website and go to the devices, you will see recommendations that you can put together and test on your own to see how it works.
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