X93155UM8IZ

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Digital potentiometers (DPs) are essential components of data acquisition systems, providing a variable resistance that can be used to control gain and offset immediately without changing the layout of the circuit. The X93155UM8IZ is a popular high-performance, low-cost digital potentiometer available from suppliers such as Texas Instruments and Analog Devices. This article will provide an overview of the X93155UM8IZ and its application field, as well as its working principle.

Application Field

X93155UM8IZ digital potentiometers are capable of providing up to 256 calibration levels to ensure the highest resolution control. The device has a minimum supply voltage of 3V and a maximum voltage of 6V, making it suitable for use in a wide range of applications requiring precision control, such as:

• Telecommunication circuits
• Audio amplifiers
• Active filters
• Clock and data recovery circuits
• Volumetric control circuits
• Gain control
• Offset calibration circuits

The X93155UM8IZ includes an on-chip register with 8 bits, allowing it to store up to 20 calibrated settings. It also features an adjustable resistance range, from 0 Ohms to more than 25 kOhms. Additionally, the digital potentiometer has an onboard reference voltage of 0.4V, providing an accurate voltage reference for setting the calibrated settings.

Working Principle

The X93155UM8IZ utilizes a voltage divider-based potentiometer design for the resistance adjusting element. When voltage is applied to one side of the potentiometer, a resistance is created; this resistance is inversely proportional to the applied voltage. The X93155UM8IZ uses an applied voltage to determine resistance, which is then replicated via an onboard register. The register contains 8 bits, allowing up to 20 unique resistance settings to be stored.

The X93155UM8IZ also includes a V REF pin, which provides an adjustable reference voltage of 0.4V. This reference voltage allows the X93155UM8IZ to accurately adjust the resistance setting without relying on external components. This allows the device to maintain an accuracy ± 2 LSB over temperature.

The device is also equipped with an 8-bit series of digital logic signals that allow it to be programmed by a microcontroller. A logic high level will correspond to a resistance setting of 0 Ohms, while a logic low level will correspond to the maximum resistance setting of 25 kOhms. This allows the microcontroller to easily adjust the resistance for different circuits based on the needs of the application.

In addition to the logic signals, the X93155UM8IZ also features an adjustable power up reset. This allows the device to resist up to the maximum resistor setting after powering up, and allows for a gradual ramping of the resistance when power is applied, avoiding sudden surges.

The X93155UM8IZ provides a reliable and cost-effective solution for precision control of gain and offset in a wide range of applications. It uses a voltage divider-based potentiometer design with an onboard register to allow up to 20 unique resistance settings. The inclusion of an adjustable reference voltage and power up reset ensures that the device remains accurate and stable over temperature and over long periods of use.

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