ISL21090 Voltage Reference

Added on April 03, 2012
Learn about the ISL21090, an ultra low noise, high DC accuracy precision voltage reference with wide input voltage range.

Related Resources

ISL21090 Datasheet ISL21090 Datasheet

isl21090.pdf (1.64 MB)
Oct 2017

ISL21090XXEV1Z User Guide ISL21090XXEV1Z User Guide

an1764.pdf (349 KB)
Mar 2018


Video Transcript

Hello, my name is Daniel Goodhew and I'm an Applications Engineer at Intersil. Today I'd like to present the ISL21090 Voltage Reference. It's a winner of the Ingenious Network 2011 Product of the Year Award and it uses Intersil's advanced bipolar technology to achieve ultra low, 1.9 microvolt peak-to-peak noise from 0.1 hertz to 10 hertz.

It also features extremely accurate 0.02% precision upon startup and it has a seven PPM per degree C temperature coefficient. This part is ideal for high-end instrumentation and data acquisition where precision and low noise are key. The voltage reference is also very easy to use. How easy is it? Let me show you.

This here is the ISL21090EVALZ Board which features the device under test in the center of the board and has a 10 microfarad bypass capacitor, a one nanofarad compensation capacitor, and a 0.1 microfarad capacitor on the load. The board also has an RC filter that can be added by using a jumper and that will allow the user to reduce the noise on the output.

The board is powered by the power supply sitting at five volts. The power supply can be anywhere from 4.7 to 36 volts and the output is measured by a high-precision multimeter, and you can see the accuracy is down to the fifth digit. Once the board is powered, the user can perform any tests desired.

One such test would be for testing the device as the temperature changes. Here I have a typical voltage reference that will be used as an example. As the temperatures increase, we can power up the meter and read the voltage output from this device, and then we have our device under tests in parallel. Using a heat gun, I will increase the temperature...You will notice that the temperature on the regular device changes drastically whereas the temperature on our device stays relatively constant.

For more information on the ISL21090, please visit, thank you.