Analog Devices Inc. AD5259BRMZ100-R7

Overview

AD5259BRMZ100-R7 from Analog Devices is a nonvolatile, I²C-compatible 256-position digital potentiometer in a compact MSOP-10 package with 100 kΩ end-to-end resistance, 0.1% stored resistance tolerance, and −40°C to +125°C operation-used for precision LCD VCOM adjustment and programmable power supply biasing.

For engineers reviewing the AD5259BRMZ100-R7 datasheet, AD5259BRMZ100-R7 pinout, AD5259BRMZ100-R7 application, or AD5259BRMZ100-R7 equivalent, key selection criteria include EEPROM-retained wiper position, VLOGIC pin for interface voltage flexibility, dual address pins (AD0/AD1) supporting up to four devices per I²C bus, and guaranteed <1 ms power-on EEPROM refresh.

Technical Context

The AD5259BRMZ100-R7 implements a resistor ladder with 256 discrete tap points controlled via an I²C interface compliant with standard-mode (400 kHz) timing. Its internal EEPROM stores both wiper position and factory-calibrated resistance tolerance (±0.1%), enabling absolute resistance accuracy without external calibration.

It supports two primary operating modes: rheostat (two-terminal, RWB/RWA) and potentiometer divider (three-terminal, VA–VB–VW), with temperature coefficients of 500 ppm/°C (rheostat) and 60 ppm/°C (divider). The VLOGIC pin decouples logic-level signaling from VDD, allowing mixed-voltage system interfacing.

Key Specifications

Pinout & Package

AD5259BRMZ100-R7 uses the MSOP-10 (3 mm × 4.9 mm × 1.1 mm) package with exposed pad not connected internally. Pin 11 (EPAD) is absent in MSOP; only present in LFCSP variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5259BRMZ100-R7, AD5258BRMZ100-R7 sacrifices persistence for lower cost and simpler initialization, while MCP45HV51-104E/MS trades I²C flexibility for higher voltage tolerance and SPI integration-neither offers the combination of EEPROM retention, VLOGIC decoupling, and I²C multi-drop capability found in AD5259BRMZ100-R7.

Availability

AD5259BRMZ100-R7 is available at Aetrix Electronics and suitable for LCD panel calibration, programmable power supplies, RF amplifier biasing, and automotive cabin electronics requiring stable component supply and long-term parameter retention.

Supply support for AD5259BRMZ100-R7 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The AD5259 belongs to Analog Devices' precision digital potentiometer product line, engineered for applications demanding nonvolatile setting retention, factory-trimmed resistance accuracy, and robust operation across extended industrial and automotive temperature ranges.

FAQ

What is the function of the VLOGIC pin on the AD5259BRMZ100-R7?

The VLOGIC pin on the AD5259BRMZ100-R7 provides independent logic-level referencing for the I²C interface, decoupling SDA and SCL voltage thresholds from VDD. This allows the AD5259BRMZ100-R7 to interface reliably with controllers operating at different supply voltages (e.g., 1.8 V or 3.3 V logic) while VDD powers the analog resistor array at 5 V. It enhances system-level voltage domain interoperability without level-shifting components.

Does the AD5259BRMZ100-R7 retain its wiper setting after power cycling?

Yes, the AD5259BRMZ100-R7 retains its wiper setting after power cycling using on-chip EEPROM. The wiper position is automatically restored within <1 ms of VDD ramp-up, and the device powers up in midscale (0x80) only if EEPROM content is invalid or uninitialized. Factory programming ensures valid default values, making AD5259BRMZ100-R7 suitable for systems requiring zero-initialization delay.

How many AD5259BRMZ100-R7 devices can share the same I²C bus?

Up to four AD5259BRMZ100-R7 devices can share the same I²C bus using the AD0 and AD1 address configuration pins. These pins are sampled and latched at power-up, selecting one of four unique 7-bit I²C addresses (0011000, 0011010, 1001100, or 1001110). No external address jumpers or resistors are needed-addressing is fully configurable via PCB routing of AD0/AD1 to VDD or GND.

What is the resistance tolerance accuracy of the AD5259BRMZ100-R7, and how is it achieved?

AD5259BRMZ100-R7 achieves 0.1% end-to-end resistance tolerance accuracy by storing calibrated ΔRAB data in on-chip EEPROM during final test. This value is factory-programmed and readable via I²C, enabling users to compute actual RAB for precision rheostat-mode applications. Unlike typical digital pots with ±20–30% initial tolerance, AD5259BRMZ100-R7 eliminates system-level calibration overhead through this embedded metrology.

Can the AD5259BRMZ100-R7 operate in both rheostat and potentiometer modes?

Yes, the AD5259BRMZ100-R7 supports both rheostat (two-terminal, A–W or B–W) and potentiometer divider (three-terminal, A–B–W) configurations. In rheostat mode, it functions as a digitally adjustable variable resistor; in potentiometer mode, it acts as a programmable voltage divider. Mode selection is determined by external circuit connection-not internal register settings-giving designers full analog flexibility without firmware constraints.