AD5220BRZ50

Overview

The AD5220BRZ50 is a single-channel, 7-bit digital potentiometer IC manufactured by Analog Devices Inc. It features a nominal resistance of 50 kΩ with 128 tap positions and volatile memory. The device operates on a supply voltage range of 2.7 V to 5.5 V, drawing a typical supply current of 15 µA at 5 V. It utilizes an Up/Down serial interface controlled by CLK, CS, and U/D pins. Key electrical characteristics include a resistor tolerance of ±30%, a temperature coefficient of 800 ppm/°C, and a wiper resistance of 40 Ω to 100 Ω. The component is housed in an 8-lead SOIC package and supports operation between -40°C and +85°C.

Feature Summary

• 7-bit resolution providing 128 distinct wiper positions for precise resistance adjustment.
• Up/Down serial interface allows control via Clock (CLK), Chip Select (CS), and Direction (U/D) signals.
• Volatile memory retains the last set wiper position only during power; resets to center upon power-on.
• Operates within a wide supply voltage range of 2.7 V to 5.5 V with low power consumption.

Applications

• Programmable gain amplifiers requiring variable resistance settings.
• Voltage divider circuits for adjustable reference voltages.
• Digital trimming of analog signal paths in instrumentation.
• Audio volume control applications utilizing rheostat mode.

Procurement Notes

Verify the specific suffix 'BRZ50' to confirm the 50 kΩ resistance value and RoHS compliance status. Ensure the ordering format matches the manufacturer's standard nomenclature for the SOIC-8 package. Cross-reference the datasheet revision history for any updates to absolute maximum ratings or thermal resistance values before finalizing procurement specifications.

Selection Notes

Select this component when a single-channel, non-volatile-adjustable resistor is required with simple Up/Down control logic. The 50 kΩ nominal value suits moderate impedance applications where 800 ppm/°C drift is acceptable. Consider the 10 kΩ or 100 kΩ variants if different bandwidth or noise performance is needed, as dynamic characteristics vary with terminal resistance. Ensure external debouncing is implemented for mechanical switch inputs driving the CLK pin.

Part Context

The AD5220BRZ50 belongs to the AD5220 family of 7-bit digital potentiometers. This series offers single-channel configurations with varying nominal resistances (10 kΩ, 50 kΩ, 100 kΩ). The 'BRZ' designation indicates a lead-free, RoHS-compliant version in an SOIC package. The family shares identical pinouts and interface protocols, differing primarily in resistance values and packaging options such as PDIP or MSOP.

Replacement Considerations

Direct functional substitutes within the same interface type include other AD5220 variants like the AD5220BRZ10 (10 kΩ) or AD5220BRZ100 (100 kΩ). For higher resolution needs, consider the AD5204 series which offers 8-bit resolution but uses an SPI interface instead of Up/Down control. Verify pin compatibility and voltage ranges when substituting with devices from other manufacturers.