AD5220BRM50

Overview

The AD5220BRM50 is a single-channel, 7-bit (128-position) digital potentiometer from Analog Devices. It features a nominal resistance of 50 kΩ with a linear taper and volatile memory. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V or dual supplies of ±2.7 V. It utilizes a 3-wire SPI-compatible serial interface for control. Key electrical specifications include a typical wiper resistance of 40 Ω to 100 Ω, a resistor tolerance of ±30%, and a temperature coefficient of 800 ppm/°C. The unit is housed in an 8-lead Mini Small Outline Package (MSOP).

Feature Summary

• 128-Position Resolution: Provides 7-bit digital control over the variable resistance.
• Volatile Memory: Wiper position is reset to mid-scale upon power-up.
• 3-Wire Serial Interface: Controlled via Clock (CLK), Chip Select (CS), and Up/Down (U/D) pins.
• Wide Supply Range: Operates effectively with single supply voltages between 2.7 V and 5.5 V.

Applications

• Mechanical Potentiometer Replacement
• Programmable Gain Amplifiers
• Offset Adjustment Circuits
• Programmable Voltage-to-Current Conversion

Procurement Notes

Verify the specific ordering suffix '50' confirms the 50 kΩ nominal resistance value. Confirm that the MSOP package option matches the PCB footprint requirements. Ensure the volatile memory characteristic aligns with system power-loss behavior expectations, as the wiper position resets to mid-scale upon power cycling.

Selection Notes

Select this component when a single-channel, non-volatile-free digital potentiometer is required. The 50 kΩ resistance value offers a balance between bandwidth and power consumption compared to 10 kΩ or 100 kΩ variants. Consider the 800 ppm/°C temperature coefficient for precision applications requiring stability across the -40°C to +85°C operating range.

Part Context

The AD5220 series includes variants with 10 kΩ, 50 kΩ, and 100 kΩ resistances. The BRM50 designation specifically identifies the commercial grade, 50 kΩ version in the 8-lead MSOP package. Other series members like the AD5222 offer dual channels, while the AD5200 provides 256 positions.

Replacement Considerations

Direct pin-compatible replacements within the same family include AD5220BRM10 (10 kΩ) and AD5220BRM100 (100 kΩ), provided the resistance value adjustment is acceptable for the circuit design.