ISL22317TFRTZ

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The ISL22317TFRTZ is a digitally programmable, mixed-mode potentiometer that combines voltage divider and resistive sensing capabilities in a single device. It is designed to offer superior resolution and accuracy when obtaining a resistive voltage divider point from a given resistor string. This makes it ideal for data acquisition, instrumentation, digital potentiometers and transducer applications.

The major benefit of the ISL22317TFRTZ digital potentiometer is the ability to program any analog voltage divider point over its full temperature range. This eliminates the need for temperature drift compensation to maintain a voltage divider point, reducing the cost and complexity of a system. By providing a programmable impedance, the device also reduces the need for resistors and over-specification of accuracy.

The ISL22317TFRTZ device operates with a 9-bit resolution, meaning there are 9 data bits available to determine the wiper position. Each of the 256 possible positions is expressed as a percentages of the total available resistive elements in the string. So, for a 100-position device, each position is equivalent to a 0.4% step size. This provides a resolution far greater than that achievable with standard resistor networks and can reduce measurement error.

The ISL22317TFRTZ is configured and operated through the serial interface which communicates the output voltage divider point across the resistor divider and determines the desired wiper position. Its advanced features include a high-impedance differential output, 2 high-impedance reference inputs which can be used to bias signals, and a high frequency, built-in sample-and-hold circuit. The device is also capable of operating off a single supply voltage as low as 1.65V, while dissipating very low power.

In addition to being an invaluable asset when used in data acquisition and instrumentation systems, a range of potential applications for the ISL22317TFRTZ digital potentiometer include temperature sensors and transducers, automatic gain control (AGC) circuits, variable gain amplifiers, audio filters and power management circuits. It can also be used for variable gain systems for sensors such as infrared and condenser microphones, capacitive to digital converters and a range of industrial and automotive applications.

At its most basic level, the ISL22317TFRTZ works as a voltage divider, dividing the output voltage by the ratio determined by the wiper position. This makes it a simple, linear analog device that converts a digital signal into an analog voltage. However, the device’s features extend far beyond this, providing saturation and overvoltage protection, bandwidth up to 1MHz, and flexibility of device design in terms of circuit topology.

The combination of low power operation and exceptional resolution and accuracy makes the ISL22317TFRTZ a great choice for data acquisition and digital potentiometer applications. It is easy to use and provides a reliable, flexible and cost-effective solution for a wide range of applications.

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