AD5220BRZ10-REEL7

Overview

The AD5220BRZ10-REEL7 is a single-channel, 7-bit digitally controlled variable resistor (RDAC) from Analog Devices. It features a nominal resistance of 10 kΩ with 128 tap positions and linear taper. The device utilizes an Up/Down serial interface requiring Clock (CLK), Chip Select (CS), and Direction (U/D) signals to adjust the wiper position. Operating on a supply voltage between 2.7 V and 5.5 V, it draws a typical supply current of 15 µA. The component is housed in an 8-lead SOIC package and supports operation within a temperature range of -40°C to +85°C.

Feature Summary

• 7-bit resolution providing 128 distinct wiper positions for precise resistance adjustment.
• Up/Down digital control interface allows incrementing or decrementing wiper position via CLK pulses.
• Nominal 10 kΩ end-to-end resistance with ±30% tolerance and 800 ppm/°C temperature coefficient.
• Low power consumption with a typical supply current of 15 µA at 5 V.

Applications

• Programmable gain amplifiers and variable attenuators in signal conditioning circuits.
• Digital potentiometer replacement for mechanical pots in volume controls and calibration systems.
• Voltage divider applications requiring software-adjustable output levels.
• Sensor biasing and reference voltage trimming in embedded systems.

Procurement Notes

Verify that the specific suffix '-REEL7' corresponds to the tape and reel packaging format required for automated assembly processes. Confirm RoHS compliance status as indicated by the 'Z' in the base part number. Ensure the 10 kΩ resistance value matches the circuit design requirements, as other variants exist for 50 kΩ and 100 kΩ.

Selection Notes

Select this component when a simple two-wire serial interface is preferred over SPI or I2C protocols. The Up/Down interface requires only three pins, saving GPIO resources. Consider the 10 kΩ nominal resistance for optimal bandwidth and settling time performance compared to higher resistance variants. Verify that volatile memory behavior aligns with the application's need to reset to a centered position upon power-up.

Part Context

This part belongs to the AD5220 family of single-channel digital potentiometers. The 'BRZ' designation indicates a commercial grade temperature range (-40°C to +85°C) and RoHS compliance in an 8-lead SOIC package. The '10' suffix specifies the 10 kΩ nominal resistance value. Other family members include higher resistance options and automotive qualified variants.

Replacement Considerations

Direct pin-compatible replacements within the same series include AD5220BRZ50 (50 kΩ) and AD5220BRZ100 (100 kΩ). For different packaging, AD5220BRMZ10 offers the same electrical characteristics in an MSOP package. Cross-family substitutes like the AD5200 series require interface changes due to differing control protocols.