AD5220BN50

Overview

The AD5220BN50 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 wiper resistance of 40 Ω (typical), a resistor temperature coefficient of 800 ppm/°C, and a full-scale error of -0.5 LSB. The component is housed in an 8-lead Plastic Dual In-Line Package (PDIP) and supports an operating temperature range from -40°C to +85°C.

Feature Summary

• 7-bit resolution providing 128 discrete wiper positions for precise resistance adjustment.
• Nominal end-to-end resistance of 50 kΩ with ±30% tolerance and 800 ppm/°C temperature coefficient.
• Up/Down serial interface requiring only three control lines (CLK, CS, U/D) for operation.
• Volatile storage mechanism that resets the wiper to the center position (Code 40H) upon power-up.

Applications

• Programmable gain amplifier circuits utilizing the rheostat configuration.
• Voltage divider networks for adjustable reference voltages or biasing.
• Digital trimming applications for calibration of analog signal paths.
• Audio volume control systems leveraging the linear taper characteristic.

Procurement Notes

Verify the specific suffix 'BN' corresponds to the PDIP package option N-8 as listed in the official ordering guide. Confirm RoHS compliance status via the 'Z' suffix designation if required, noting that the base model number indicates the resistance value and package type. Cross-reference the part number against the manufacturer's current production status to ensure availability.

Selection Notes

Select this component when a 50 kΩ variable resistance is required with 7-bit precision. Ensure the application can accommodate volatile memory behavior, as the wiper position is not retained after power loss. Verify that the system logic levels are compatible with the specified VIH and VIL thresholds for the 2.7 V to 5.5 V supply range. Consider the 40 Ω wiper resistance impact on linearity if low-resistance loads are connected.

Part Context

The AD5220 belongs to the AD5220 family of single-channel digital potentiometers. This family includes variants with different nominal resistances (10 kΩ, 50 kΩ, 100 kΩ) and package options such as SOIC and MSOP. The BN suffix specifically denotes the 50 kΩ version in the 8-lead PDIP package, distinguishing it from the BR series which uses surface-mount packaging.

Replacement Considerations

Direct pin-compatible substitutes within the same family include AD5220BNZ10 (10 kΩ) and AD5220BNZ100 (100 kΩ). For surface-mount replacements, consider the AD5220BRZ50 in the SOIC package. Verify that the replacement maintains the 50 kΩ nominal resistance and 7-bit resolution requirements.