AD5291BRUZ-20

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AD5291BRUZ-20 Digital Potentiometer

Digital potentiometers are devices used to control the resistance in a circuit from a remote location. The AD5291BRUZ-20 is a digital potentiometer developed by Analog Devices for such applications. It contains a 256 uncommitted, 256k-position wiper, high voltage tolerance and low noise operation.The device is packaged in an 8-lead SSOP package and is specified to operate from a single 2.7V to 5V supply across the entire 5V range.

Application Field

The AD5291BRUZ-20 is suitable for both low and high voltage applications, as it can operate in the full −0.3 V to 5.5 V range and is supplied in an 8-lead SSOP package, making it suitable for use in space and power sensitive design. This device is also extremely versatile, with 256 uncommitted positions, providing a wide variety of applications. In addition, it offers low noise operation and low temperature sensitivity.

The AD5291BRUZ-20 can be used in gain adjustment on ADC inputs, adjustment of base current in op amps, brightness adjustment on LEDs and LCDs, volume and tone control for audio circuits and adjusting the offset voltage for DACs, to name just a few.

Working Principle

The device is based on a low power CMOS technology, which supplies a digital control switch made up of two pairs of electrodes. One of the two pairs is connected to the wiper and the other pair is grounded. The digital control switch is used to set the wiper position and resistance between the wiper and the resistance ladder. The device has a 12-bit serial interface which offers flexible control, as well as fast write and read capability.

The AD5291BRUZ-20 operates in the 2.7V to 5V range and has an output of −0.3V to 5.5V. With 256 uncommitted positions, it provides an adjustable range of 0Ω to 10kΩ in 10Ω increments. The wiper settings can be written to either the serial bus or the control input, thus allowing the user to select any of the 256 positions as required with a 0 - 255 numerical range.

The device also includes a power-on reset which sets the initial wiper position to the midpoint in order to prevent any unintentional settings. Additionally, the AD5291BRUZ-20 also features a 2-wire and 3-wire serial interface, providing the user with both options. It also provides a power-down mode which helps to reduce power consumption in applications where the wiper position is not frequently changed.

In summary, the AD5291BRUZ-20 is an ideal low-noise, low-power digital potentiometer for applications requiring frequent adjustment of control variables. Its wide voltage range, uncommitted positions, and quick write and read capability make it a great choice for precision applications requiring remote control.

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