AD5220BRM100

Overview

The AD5220BRM100 is a single-channel, 7-bit digital potentiometer from Analog Devices, housed in an 8-lead MSOP package. It features a nominal resistance of 100 kΩ with 128 tap positions controlled via a 3-wire serial interface (CLK, CS, U/D). Operating on a single supply voltage between 2.7 V and 5.5 V, the device draws a maximum supply current of 40 mA at 5.5 V. It supports both rheostat and voltage divider modes, offering a typical wiper resistance of 100 Ω and a temperature coefficient of 800 ppm/°C for the resistor network.

Feature Summary

• 128-position resolution with 7-bit control via 3-wire serial interface
• Nominal resistance options including 100 kΩ with ±30% tolerance
• Single supply operation ranging from 2.7 V to 5.5 V
• Internal power-on preset to mid-scale position

Applications

• Mechanical potentiometer replacement
• Programmable gain amplifiers
• Offset adjustment circuits
• Programmable filters and time constants

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as indicated by the 'Z' suffix in ordering guides, noting that specific suffixes may denote packaging variations rather than functional changes. Check for automotive-grade variants if operating conditions require extended reliability standards.

Selection Notes

Select this model when a 100 kΩ variable resistor with 128 discrete steps is required. Ensure the application logic can drive the negative-edge triggered CLK pin and manage the U/D direction signal. Consider the 800 ppm/°C temperature coefficient for precision applications, or utilize the voltage divider mode to improve thermal stability to 20 ppm/°C.

Part Context

This component belongs to the AD5220 family of programmable resistors. The BRM100 designation specifically identifies the 100 kΩ variant packaged in an 8-lead Mini Small Outline Package (MSOP). Other variants in the series include 10 kΩ and 50 kΩ versions available in PDIP and SOIC packages.

Replacement Considerations

Direct replacements within the same family include AD5220BRMZ100 (SOIC package) or AD5220BNZ100 (PDIP package), provided the footprint allows. Cross-family substitutes like the AD5242 offer I2C interfaces but differ in pinout and control logic.