AD5122BCPZ100-RL7

Overview

The AD5122BCPZ100-RL7 is a dual-channel, nonvolatile digital potentiometer from Analog Devices Inc. It features two independent 100 kΩ resistive networks with 128 tap positions controlled via an SPI-compatible interface. The device operates on a single supply of 2.3 V to 5.5 V or a dual supply of ±2.25 V to ±2.75 V, with a logic supply range of 1.8 V to VDD. Key electrical parameters include a maximum resistor tolerance of ±8%, a temperature coefficient of 35 ppm/°C, and a wiper current capability of ±1.5 mA for the 100 kΩ variant. It provides nonvolatile memory retention for wiper settings.

Feature Summary

• Dual-channel architecture with 128-position resolution and 100 kΩ end-to-end resistance.
• Nonvolatile EEPROM storage retains wiper settings across power cycles.
• SPI-compatible serial interface allows for independent programming and readback of RDAC registers.
• Supports linear gain setting mode (INDEP) for independent string resistor programming.

Applications

• Portable electronics level adjustment
• LCD panel brightness and contrast controls
• Programmable filters, delays, and time constants
• Programmable power supplies

Procurement Notes

Verify the specific ordering suffix BCPZ corresponds to the 16-lead LFCSP package and RL7 indicates reel packaging. Confirm that the 'B' grade meets the required ±8% tolerance specifications for the application. Ensure the logic voltage levels are compatible with the host microcontroller's SPI interface before integration.

Selection Notes

Select this model over the AD5142 if 128 taps are sufficient, as the AD5142 offers 256 taps. Choose the 100 kΩ version for lower current consumption applications compared to the 10 kΩ variant. Verify that the 3 mm × 3 mm LFCSP package fits the PCB footprint constraints. Consider the AEC-Q100 qualification if automotive reliability standards are required.

Part Context

This component belongs to the AD5122/AD5142 family of dual-channel digital potentiometers. The AD5122 variant specifically provides 128 positions, whereas the AD5142 provides 256 positions. Both share similar electrical characteristics but differ in resolution and control word structure. The family supports both SPI and I2C interfaces depending on the specific sub-model.

Replacement Considerations

The AD5122BRUZ100-RL7 is a parameter-equivalent alternative available in a TSSOP package. The AD5142 series offers higher resolution (256 taps) but requires different control codes. Verify pinout compatibility when substituting between LFCSP and TSSOP packages.