Analog Devices Inc. AD5144ABRUZ100

Overview

AD5144ABRUZ100 from Analog Devices is a quad-channel, 256-position, nonvolatile digital potentiometer with I²C/SPI interface, 100 kΩ end-to-end resistance, ±8% resistor tolerance, and guaranteed operation from −40°C to +125°C. It serves as a precision programmable resistor in analog signal conditioning paths for portable electronics, LCD bias control, and programmable power supplies.

For engineers reviewing the AD5144ABRUZ100 datasheet, AD5144ABRUZ100 pinout, AD5144ABRUZ100 application, or AD5144ABRUZ100 equivalent, key selection criteria include its dual-supply capability (±2.25 V to ±2.75 V), 3 MHz bandwidth at 10 kΩ (0.43 MHz at 100 kΩ), 8-bit resolution, EEPROM retention of 50 years, and TSSOP-20 package compatibility with industrial temperature requirements.

Technical Context

The AD5144ABRUZ100 implements four independent RDAC channels, each configurable as either a rheostat (two-terminal) or potentiometer divider (three-terminal), with linear gain setting mode enabling precise resistor matching between channels. Its architecture supports both I²C (up to 400 kHz fast mode) and SPI (CPOL/CPHA configurable) interfaces, with separate logic supply (VLOGIC = 1.8 V to 5.5 V) decoupled from analog rails.

Nonvolatile storage uses on-chip EEPROM with 100,000-cycle endurance and 50-year data retention at 125°C junction temperature. Wiper current is limited to ±1.5 mA at 100 kΩ, and terminal voltage range spans VSS to VDD - supporting bipolar signal adjustment when operated with dual supplies.

Key Specifications

Pinout & Package

AD5144ABRUZ100 is housed in a 20-lead TSSOP package (4.4 mm × 6.5 mm, 0.65 mm pitch), optimized for surface-mount assembly and thermal performance in space-constrained industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital potentiometer applications.

Compared with AD5144ABRUZ100, AD5144BRUZ100 sacrifices I²C flexibility for SPI simplicity, while MCP45HV51-104E/ST trades EEPROM retention for higher voltage tolerance and finer 12-bit resolution - making AD5144ABRUZ100 optimal for I²C-based, self-contained calibration in industrial temperature environments.

Availability

AD5144ABRUZ100 is available at Aetrix Electronics and suitable for portable electronics level adjustment, LCD panel brightness and contrast controls, and programmable power supplies requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for AD5144ABRUZ100 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The AD51xx family delivers precision, nonvolatile digital potentiometers engineered for closed-loop calibration, sensor trimming, and programmable analog signal conditioning in harsh environments.

FAQ

What interface protocols does the AD5144ABRUZ100 support?

The AD5144ABRUZ100 supports both I²C (standard and fast mode up to 400 kHz) and SPI (CPOL/CPHA configurable) interfaces. Its I²C implementation includes an ADDR pin for hardware address selection, enabling up to four AD5144ABRUZ100 devices on a shared bus. SPI timing meets t1–t10 specifications in Table 4 of the Rev. E datasheet, with SYNC-to-SCLK setup and hold times validated down to 1.8 V VLOGIC.

Does the AD5144ABRUZ100 retain wiper settings after power loss?

Yes, the AD5144ABRUZ100 stores wiper register values in on-chip EEPROM with guaranteed 50-year data retention at 125°C junction temperature and 100,000 write cycles. Upon power-up, the device defaults to the last stored value unless overridden by a RESET assertion or new command. This nonvolatile behavior eliminates the need for external memory or MCU-initiated reinitialization in AD5144ABRUZ100-based systems.

Can the AD5144ABRUZ100 operate with dual analog supplies?

Yes, the AD5144ABRUZ100 supports dual-supply operation with VDD and VSS rails ranging from ±2.25 V to ±2.75 V. This enables true bipolar signal adjustment - for example, applying ±2.5 V across A and B terminals while referencing the wiper to ground. Terminal voltage limits remain VSS ≤ VA/VW/VB ≤ VDD, preserving switch integrity and ensuring safe operation in AC-coupled or offset-biased analog paths using AD5144ABRUZ100.

What is the maximum wiper current rating for the AD5144ABRUZ100 at 100 kΩ?

The AD5144ABRUZ100 specifies a maximum continuous wiper current of ±1.5 mA when configured with 100 kΩ end-to-end resistance. This limit is derived from the (0.7 × VDD)/RAB relationship and applies across the full −40°C to +125°C temperature range. Exceeding this current risks accelerated wear of internal CMOS switches and potential long-term resistance drift - a constraint explicitly defined in Table 3's "Maximum Continuous Current" parameter for RAB = 100 kΩ.

How does the linear gain setting mode improve channel matching in the AD5144ABRUZ100?

The linear gain setting mode in the AD5144ABRUZ100 allows independent programming of the RAW and RWB resistor strings within each RDAC channel, enabling precise ratio control rather than just absolute resistance. This feature achieves ±0.2% nominal resistance match (RAB1/RAB2) between channels - critical for applications like instrumentation amplifier gain networks where mismatch directly impacts common-mode rejection. The mode is activated via control register bit configuration and is documented in the "Advanced Control Modes" section of the datasheet.