AD5112BCPZ80-RL7

Overview

The AD5112BCPZ80-RL7 is a single-channel, nonvolatile digital potentiometer featuring 64 tap positions and an I2C-compatible interface. It offers a nominal resistance of 80 kΩ with ±8% tolerance and a temperature coefficient of 35 ppm/°C. The device operates on a 2.3 V to 5.5 V analog supply and supports logic levels from 1.8 V to 5.5 V. Key specifications include a maximum wiper current of ±1.5 mA for the 80 kΩ variant, low power consumption (2.5 µA max at 2.7 V), and EEPROM storage for wiper settings. It is housed in a compact 2 mm × 2 mm × 0.55 mm 8-lead LFCSP package.

Feature Summary

• Nonvolatile memory retains wiper position after power loss with 50-year typical data retention.
• I2C serial interface allows control and readback of RDAC register and EEPROM content.
• Low wiper resistance minimizes error in extremes, typically 45 Ω at bottom scale.
• Extended industrial temperature range operation from −40°C to +125°C.

Applications

• Mechanical potentiometer replacement
• Portable electronics level adjustment
• Audio volume control
• LCD panel brightness and contrast control
• Sensor calibration

Procurement Notes

Verify the specific suffix 'RL7' against the manufacturer's ordering guide to confirm tape and reel packaging requirements. Ensure the 80 kΩ resistance value matches the design intent, as the AD5112 family also includes 5 kΩ and 10 kΩ options. Confirm that the I2C address configuration aligns with the system bus topology.

Selection Notes

Select this component when 64-position resolution is sufficient for the application. The 80 kΩ resistance limits the maximum continuous terminal current to ±1.5 mA; higher current applications require lower resistance variants like the 5 kΩ or 10 kΩ versions. Verify that the system voltage stays within the 2.3 V to 5.5 V range for proper operation of both analog and logic supplies.

Part Context

This part belongs to the AD5110/AD5112/AD5114 family of single-channel digital potentiometers. The AD5112 specifically provides 64 positions, distinguishing it from the 128-position AD5110 and the 32-position AD5114. All members share similar electrical characteristics, including ±8% resistor tolerance and nonvolatile EEPROM storage, but differ in resolution and available resistance values.

Replacement Considerations

Direct functional substitutes within the same family include the AD5112BCPZ10-RL7 (10 kΩ) and AD5112BCPZ5-RL7 (5 kΩ). These parts share the same pinout, package, and interface but offer different resistance values and current handling capabilities. Cross-family replacements like the AD5110 series provide higher resolution (128 taps) but may require software adjustments for code mapping.

FAQ

What is the maximum continuous current allowed for the 80 kΩ version?

For the 80 kΩ resistance option, the maximum continuous current through terminals A, B, and W is limited to ±1.5 mA.

How long does it take for the device to restore its wiper position upon power-up?

The power-on EEPROM refresh time is less than 50 μs, allowing the device to quickly resume its stored wiper setting.

Can the resistor tolerance be calibrated out?

Yes, the resistor tolerance is stored within the EEPROM, providing an end-to-end tolerance accuracy of 0.1% when utilized by the controlling system.