AD5274BRMZ-20

Digital Potentiometers Overview

The AD5274BRMZ-20 is a single-channel digital rheostat featuring 256-position resolution and an I²C-compatible interface. It offers a nominal resistance of 20 kΩ with a maximum ±1% end-to-end resistor tolerance error in R-Perf mode. The device operates on a single supply from 2.7 V to 5.5 V or dual supplies of ±2.5 V to ±2.75 V. It includes 50-times programmable (50-TP) nonvolatile memory for wiper position storage, ensuring settings are restored upon power-up. The component is housed in a compact 10-lead MSOP package and supports standard and fast I²C modes.

Digital Potentiometers Feature Summary

• 256-position resolution with 8-bit control
• I²C-compatible serial interface supporting standard (100 kHz) and fast (400 kHz) modes
• 50-times programmable (50-TP) nonvolatile memory for permanent wiper setting storage
• Maximum ±1% nominal resistor tolerance error in R-Perf mode

Digital Potentiometers Applications

• Mechanical rheostat replacements
• Op-amp variable gain control
• Instrumentation gain and offset adjustment
• Programmable voltage to current conversions
• Sensor calibration

Digital Potentiometers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature range. Ensure compatibility with the target system's I²C bus addressing requirements, as the ADDR pin determines the two least significant bits of the 7-bit device address. Confirm that the external pull-up resistors on SDA and SCL lines meet the specified timing constraints for the desired clock frequency.

Digital Potentiometers Selection Notes

Select the AD5274BRMZ-20 when 256-position resolution is sufficient for the application, distinguishing it from the 1024-position AD5272 variant. Verify that the 20 kΩ nominal resistance aligns with the circuit's impedance requirements. Ensure the design accommodates the required 1 µF capacitor on the EXT_CAP pin and adheres to the absolute maximum ratings for terminal voltages and currents.

Digital Potentiometers Part Context

This component belongs to the AD5272/AD5274 family of digital rheostats manufactured by Analog Devices Inc. The AD5274 specifically provides 256 positions, whereas the AD5272 offers 1024 positions. Both share similar electrical characteristics, including the 50-TP memory feature and I²C interface, but differ in resolution and corresponding code ranges for tolerance specifications.

Digital Potentiometers Replacement Considerations

The AD5272BRMZ-20 serves as a higher-resolution alternative within the same family, offering 1024 positions instead of 256. Other variants in the series may offer different nominal resistances (50 kΩ, 100 kΩ) or package types (LFCSP). Verify pinout compatibility and I²C address configuration when substituting.