ISL22317 DCP has one per cent resistor tolerance
Intersil
ISL22317 DCP
Intersil has introduced the ISL22317, a low-voltage digitally controlled potentiometer (DCP) with less than one per cent 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 suitable for designs that require specific current and resistor values such as test and measurement circuits, medical devices or backlight controls.
It can also adjust specific resistances in analogue circuits.
The architecture of the ISL22317 allows it to track an external resistor within 10ppm/C, improving overall system accuracy for temperatures up to 125C.
The device 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 the user 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 more than one-million times in the integrated EEPROM memory.
It 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 perform schematic calculations based on an actual one per cent value, instead of competitive solutions that have more than +/-20 per cent tolerance of the resistor string in addition to wiper resistance error.
The ISL22317 is available in 3 x 3mm TDFN package, 0.75mm max thickness, 0.65mm pitch.
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