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Digipot delivers
Posted: 30 Jun 2009 ?? ?Print Version ?Bookmark and Share

Keywords:digipot? potentiometer? resistor?

ISL22317 DCP

Intersil Corp. has released what it touts to be the first digitally controlled potentiometer (DCP) with resistor tolerance. The ISL22317 has ultralow tolerance that is can be used as a true variable resistor. Thus users can set standard and non-standard resistor values for open-loop applications.

The ISL22317 is useful for designs that need specific current and resistor values, including test and measurement circuits, medical devices, backlight controls, and analog devoices that need adjusting for specific resistances. 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 125C.

With this DCP users can select accurate pre-determined resistor values, and use calculated resistor values in schematics, reducing programming time and development costs. It also allows the use of 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.

The ISL22317 features a zero-compensated wiper resistance in rheostat mode. Overall accuracy is improved by negating wiper resistance, especially at the low tap positions where the ratio of wiper resistance to actual resistance is much higher. So the users can perform schematic calculations based on an actual 1 percent value. This is an improvement over 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 and pin selectable slave address. The digipot also offers 10-, 50- and 100k? total resistance options, monotonic over-temperature and non-volatile EEPROM storage of wiper position. In addition, the device packs single 2.7V to 5.5V supply and -40C to 125C operating temperature range.

The ISL22317 DCP is available in 3mm x 3mm TDFN Package with 0.75mm max thickness and 0.65mm pitch. Pricing is $1.80 for 1,000 units.

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