AD5222BR1M

Overview

The AD5222BR1M is a dual-channel, 128-position digital potentiometer from Analog Devices. It features two independent variable resistors with a nominal end-to-end resistance of 1 MΩ and a temperature coefficient of -35 ppm/°C. The device operates on a single supply of 2.7 V to 5.5 V or a dual supply of ±2.3 V to ±2.7 V. It utilizes an increment/decrement interface controlled by CS, CLK, and U/D inputs, allowing push-button operation without a microcontroller. The component is housed in a 14-lead SOIC package and supports industrial temperatures from -40°C to +85°C.

Feature Summary

• Dual-channel architecture with 128 tap positions per channel
• Nominal resistance of 1 MΩ with ±30% tolerance
• Increment/Decrement control interface compatible with mechanical switches
• Low power consumption with maximum supply current of 40 µA

Applications

• Stereo channel audio level control
• Mechanical potentiometer replacement in instrumentation
• Remote incremental adjustment applications
• Programmable voltage-to-current conversion circuits

Procurement Notes

Verify the specific suffix BR1M indicates the 1 MΩ resistance value and SOIC-14 package configuration. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure ESD handling procedures are followed during assembly due to the sensitivity of the CMOS input structures.

Selection Notes

Select this model when a high-resistance digital potentiometer is required for low-power applications. The 1 MΩ value minimizes current flow but results in lower bandwidth compared to lower resistance variants. Verify that the system clock timing meets the setup and hold requirements specified in the datasheet for reliable up/down counting operations.

Part Context

This component belongs to the AD5222 family of dual digital potentiometers. Other variants in the series include models with 10 kΩ, 50 kΩ, and 100 kΩ nominal resistances. These alternatives offer higher bandwidth and faster settling times suitable for different signal processing requirements while maintaining the same control interface and pinout.

Replacement Considerations

Direct replacements within the same family include AD5222BR10, AD5222BR50, and AD5222BR100, which share identical pinouts and control logic but differ in nominal resistance values. For SPI-compatible interfaces, consider the AD5203 or AD5206 series as functional alternatives with different control protocols.