AD5122ABRUZ100-RL7

Overview

The AD5122ABRUZ100-RL7 is a dual-channel, nonvolatile digital potentiometer from Analog Devices. It features two independent 128-position wipers with a nominal resistance of 100 kΩ and an 8% tolerance. The device utilizes an I²C-compatible serial interface for programming and data retrieval. Operating within a supply voltage range of 2.3 V to 5.5 V, it supports single or dual-supply configurations. Key electrical parameters include a maximum wiper current of ±1.5 mA per channel, a bandwidth of 0.43 MHz at 100 kΩ, and a low temperature coefficient of 35 ppm/°C. The component is housed in a 16-lead TSSOP package.

Feature Summary

• Dual-channel architecture with 128 nonvolatile positions per potentiometer
• I²C serial interface supporting standard (100 kHz) and fast (400 kHz) modes
• 100 kΩ nominal resistance with ±8% tolerance and 35 ppm/°C temperature coefficient
• Independent logic supply (VLOGIC) ranging from 1.8 V to 5.5 V

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 suffix 'BRUZ' corresponds to the 100 kΩ resistance value and TSSOP-16 package configuration. Confirm that the 'A' variant designation aligns with the required I²C interface specifications. Ensure compliance with the extended industrial operating temperature range of −40°C to +125°C for the target application environment.

Selection Notes

Select this model when a dual-channel solution with 100 kΩ resistance is required. The 128-position resolution provides sufficient granularity for most analog control applications. Consider the 0.43 MHz bandwidth limit at 100 kΩ for high-frequency signal processing tasks. Verify that the system logic levels are compatible with the 1.8 V to 5.5 V VLOGIC input range.

Part Context

This component belongs to the AD5122A/AD5142A family of dual-channel digital potentiometers. The AD5122A variant specifically offers 128 positions, whereas the AD5142A provides 256 positions. Both variants share identical pinouts and core functionalities but differ in resolution and associated nonlinearity specifications.

Replacement Considerations

The AD5122BRUZ100-RL7 serves as a parameter-equivalent alternative within the same product family. Substitution requires verification that the SPI interface of the BRUZ variant matches the system design, as the ABRUZ variant uses I²C.

FAQ

What is the maximum continuous current allowed for the 100 kΩ resistors?

The maximum continuous current for the A, B, and W terminals is ±1.5 mA when the resistor value (RAB) is 100 kΩ.

How does the INDEP pin function during power-up?

When the INDEP pin is enabled, the device enters linear gain setting mode at power-up. In this state, each string resistor is loaded from its associated memory location, and this mode cannot be disabled by software.

What is the EEPROM data retention period?

The EEPROM data retention is guaranteed for 50 years at a junction temperature of 125°C, assuming an endurance of 1,000 write cycles.