First low-voltage digitally controlled potentiometer with < 1% typical resistor tolerance

Aug. 13, 2009
Intersil claims it’s developed the first low-voltage digitally controlled potentiometer (DCP) with < 1% typical resistor tolerance.

Essex, England: Intersil claims it’s developed the first low-voltage digitally controlled potentiometer (DCP) with < 1% typical resistor tolerance. Thanks to the ISL22317’s extremely low tolerance, it can be used as a true variable resistor, enabling users to set standard and non-standard resistor values for open-loop applications.

The ISL22317 targets designs that require specific current and resistor values, such as test and measurement circuits, medical devices, backlight controls, or adjusting specific resistances in analog circuits. The patent-pending architecture of the DCP allows it to track an external resistor within 10ppm/°C, improving overall system accuracy for temperatures up to 125°C.

The device reduces programming time and development costs by letting users select accurate predetermined resistor values, as well as use calculated resistor values in schematics. In addition, a designer can apply the known value of one system to calibrate other systems. The device employs an easy-touse I2C interface to program accurate resistor settings greater than 1 million times in the integrated EEPROM memory. It also features a zero-compensated wiper resistance in rheostat mode. Negating wiper resistance improves overall accuracy, especially at the low tap positions where the ratio of wiper resistance to actual resistance is much higher.

With this feature, users are able to do schematic calculations based on an actual 1% value. Competitive solution typically have greater than ±20 percent tolerance of the resistor string in addition to wiper resistance error.

Sponsored Recommendations

Understanding Thermal Challenges in EV Charging Applications

March 28, 2024
As EVs emerge as the dominant mode of transportation, factors such as battery range and quicker charging rates will play pivotal roles in the global economy.

Board-Mount DC/DC Converters in Medical Applications

March 27, 2024
AC/DC or board-mount DC/DC converters provide power for medical devices. This article explains why isolation might be needed and which safety standards apply.

Use Rugged Multiband Antennas to Solve the Mobile Connectivity Challenge

March 27, 2024
Selecting and using antennas for mobile applications requires attention to electrical, mechanical, and environmental characteristics: TE modules can help.

Out-of-the-box Cellular and Wi-Fi connectivity with AWS IoT ExpressLink

March 27, 2024
This demo shows how to enroll LTE-M and Wi-Fi evaluation boards with AWS IoT Core, set up a Connected Health Solution as well as AWS AT commands and AWS IoT ExpressLink security...

Comments

To join the conversation, and become an exclusive member of Electronic Design, create an account today!