AD5222BR1M-REEL7

Overview

The AD5222BR1M-REEL7 is a dual-channel, 128-position digitally controlled variable resistor (VR) from Analog Devices Inc. It features two independent rheostats 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 up to ±2.7 V. Key electrical parameters include a maximum power dissipation of 400 mW at 5 V, a wiper resistance of 100 Ω, and a bandwidth of 7 kHz for the 1 MΩ version. It utilizes a simple serial interface with Chip Select (CS), Clock (CLK), and Up/Down (U/D) inputs for position control.

Feature Summary

• Dual channel 128-position digital potentiometer with 1 MΩ terminal resistance
• Simple push-button controllable interface using CS, CLK, and U/D pins
• Operates on 2.7 V to 5.5 V single supply or ±2.7 V dual supply
• Low power consumption with 40 mA maximum supply current

Applications

• Stereo channel audio level control
• Mechanical potentiometer replacement in instrument panels
• Remote incremental adjustment applications
• Instrumentation gain and offset adjustment
• Programmable voltage-to-current conversion

Procurement Notes

Verify the specific ordering suffix 'R-14' corresponds to the SO-14 surface-mount package as listed in the manufacturer's ordering guide. Confirm that the 'REEL7' designation indicates tape-and-reel packaging suitable for automated assembly processes. Ensure compatibility with the extended industrial temperature range of –40 °C to +85°C required for the application environment.

Selection Notes

Select this model when a high-resistance value (1 MΩ) is required for low-power applications or high-impedance signal paths. Note that the bandwidth decreases significantly to 7 kHz compared to lower resistance variants. Consider the 100 Ω wiper resistance impact on circuit accuracy. Verify if the simple serial interface meets timing requirements without microcontroller intervention.

Part Context

The AD5222 series replaces mechanical potentiometers in test and measurement equipment. The BR1M variant specifically denotes the 1 MΩ resistance option in the SO-14 package. This component eliminates the need for complex digital interfaces by supporting direct connection to mechanical switches or push-buttons with appropriate debounce circuitry.

Replacement Considerations

Public confirmed substitute part numbers are not explicitly listed in the provided datasheet text. For SPI-compatible interfaces, the AD5203, AD5204, AD5206, AD7376, and AD8400/AD8402/AD8403 families are referenced as alternatives with different interface protocols.