AD5220BRMZ50-RL7

Overview

The AD5220BRMZ50-RL7 is a single-channel, 7-bit digitally controlled variable resistor (RDAC) from Analog Devices. It features a nominal resistance of 50 kΩ with 128 tap positions and linear taper. The device utilizes a simple three-wire serial interface consisting of Chip Select (CS), Clock (CLK), and Up/Down (U/D) control lines to adjust the wiper position. Operating on a supply voltage range of 2.7 V to 5.5 V, it draws a typical supply current of 15 µA. The component is housed in an 8-lead Mini Small Outline Package (MSOP) and supports operation across a temperature range of -40°C to +85°C.

Feature Summary

• 7-bit resolution providing 128 distinct wiper positions for precise resistance adjustment.
• Three-wire serial interface using CS, CLK, and U/D pins for digital control.
• Nominal end-to-end resistance of 50 kΩ with a linearity tolerance of ±30% at 25°C.
• Low power consumption with a typical supply current of 15 µA at 5 V.

Applications

• Programmable gain amplifiers requiring digital adjustment of gain settings.
• Voltage divider circuits for programmable reference voltages.
• Digital potentiometer replacement in rheostat configurations for current limiting.
• Audio volume control applications utilizing the variable resistance characteristics.

Procurement Notes

Verify the specific ordering suffix RL7 corresponds to the reel packaging format required for automated assembly processes. Confirm that the BRMZ designation matches the MSOP-8 package option needed for the target PCB footprint. Ensure the 'Z' suffix indicates RoHS compliance if environmental regulations apply to the manufacturing site. Cross-reference the 50 kΩ resistance value against circuit requirements to ensure compatibility with load impedance constraints.

Selection Notes

Select this model when a single-channel variable resistor with 7-bit precision is required. The 50 kΩ nominal resistance offers a balance between bandwidth and power dissipation compared to 10 kΩ or 100 kΩ variants. The MSOP-8 package is suitable for space-constrained designs. Consider the volatile memory nature of the wiper position, which resets to mid-scale upon power-up, if state retention is critical for system initialization.

Part Context

This component belongs to the AD5220 family of single-channel digital potentiometers. The BRMZ50 variant specifically denotes the 50 kΩ resistance value within the MSOP-8 package. Other variants in the series include 10 kΩ and 100 kΩ options, as well as different package types such as PDIP and SOIC. The family shares the same 7-bit architecture and three-wire control interface logic.

Replacement Considerations

Direct pin-compatible replacements within the same family include AD5220BRMZ10 (10 kΩ) and AD5220BRMZ100 (100 kΩ). Verify that the alternative resistance value meets the circuit's electrical requirements. For non-pin-compatible needs, consider higher-resolution models like the AD5243, though interface protocols may differ.