SOURCE: Intersil

June 24, 2009 15:30 ET

First Low-Voltage, Precision, Digitally Controlled Potentiometer (DCP) Reduces Cost, Programming and System Calibration

Patent-Pending ISL22317 Offers Less Than 1% Typical Resistor Tolerance, Zero-Compensated Wiper Resistance; More Than 200x the Accuracy of Competitive Solutions

MILPITAS, CA--(Marketwire - June 24, 2009) - Intersil Corporation (NASDAQ: ISIL), a leader in the design and manufacture of analog and mixed-signal semiconductors, today introduced ISL22317, the first low-voltage DCP with < 1 percent typical resistor tolerance. The ultra-low tolerance allows the ISL22317 to be used as a true variable resistor, enabling users to set standard and non-standard resistor values for open-loop applications.

The ISL22317 is an excellent choice for 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 ISL22317 allows it to track an external resistor within 10ppm/°C, improving overall system accuracy for temperatures up to 125°C.

The ISL22317 reduces programming time and development costs by letting users select accurate pre-determined resistor values, and use calculated resistor values in schematics. In addition, it allows one to use the known value of one system to calibrate other systems. The device employs an easy-to-use I2C interface to program accurate resistor settings > 1 million times in the integrated EEPROM memory.

Technical Features and Benefits

The ISL22317 also features a zero-compensated wiper resistance in rheostat mode. By negating wiper resistance, overall accuracy is improved, especially at the low tap positions where the ratio of wiper resistance to actual resistance is much higher. This enables users to do schematic calculations based on an actual 1 percent value, instead of competitive solutions that have > +/-20 percent tolerance of the resistor string in addition to wiper resistance error.

The product also features:

--  128-Tap Positions
--  I2C Serial Interface
--  Pin Selectable Slave Address
--  10k-ohm, 50k-ohm and 100k-ohm total resistance options
--  Monotonic over-temperature
--  Non-volatile EEPROM storage of wiper position
--  Single 2.7V to 5.5V supply
--  -40C to 125°C operating temperature range
    

Packaging, Pricing, and Availability

The ISL22317 is available in 3mmx3mm TDFN Package -- 0.75mm max thickness, 0.65mm pitch. Versions with 10kOhms, 50kOhms, and 100kOhms are available; 1,000-unit pricing is $1.80.

For more information, please visit: http://www.intersil.com/products/deviceinfo.asp?pn=ISL22317

To view a high-resolution downloadable photo, please visit Intersil's photo room at: http://www.intersil.com/pressroom/photoarchives.asp.

About Intersil

Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, other handheld systems, and notebooks. Intersil's product families address power management functions and analog signal processing functions. Intersil products include ICs for battery management, hot-swap and hot-plug controllers, linear regulators, power sequencers, supervisory ICs, bridge drivers, PWM controllers, switching DC/DC regulators and power MOSFET drivers; optical storage laser diode drivers; DSL line drivers; D2Audio products; video and high-performance operational amplifiers; high-speed data converters; interface ICs; analog switches and multiplexers; crosspoint switches; voice-over-IP devices; and ICs for military, space and radiation-hardened applications. For more information about Intersil or to find out how to become a member of our winning team, visit the Company's web site and career page at www.intersil.com.