Analog Devices Inc. AD5228BUJZ10-RL7

Overview

AD5228BUJZ10-RL7 from Analog Devices is a 32-position manual up/down digital potentiometer with 10 kΩ end-to-end resistance, SOT-23-8 package, −40°C to +105°C operating range, and ultralow 0.4 µA standby current. It replaces mechanical trimmers in LCD backlight control, LED driver biasing, and portable front-panel adjustments using only two tactile switches.

For engineers reviewing the AD5228BUJZ10-RL7 datasheet, AD5228BUJZ10-RL7 pinout, AD5228BUJZ10-RL7 application, or AD5228BUJZ10-RL7 equivalent, key selection criteria include its adaptive debounced pushbutton interface, 5 ppm/°C potentiometer-mode tempco, autoscan mode (4 steps/sec), zero/midscale power-on preset, and guaranteed monotonicity in both rheostat and divider modes.

Technical Context

The AD5228BUJZ10-RL7 implements a discrete 32-step resistor string with CMOS wiper switch, supporting both rheostat (W–B or W–A) and potentiometer (A–W–B) configurations. Its internal adaptive debouncer rejects contact bounce <11 ms and enables reliable single-step or autoscan operation without external logic.

Control is purely asynchronous via active-low PU/PD pins with integrated 100 kΩ pull-ups; no clock, serial interface, or microcontroller firmware is required. The PRE pin selects midscale (GND) or zero-scale (VDD) at power-up, and terminal voltage compliance is strictly bounded by VDD and GND-no signal may exceed those rails.

Key Specifications

Pinout & Package

AD5228BUJZ10-RL7 is housed in a Pb-free thin SOT-23-8 (TSOT-8) package measuring 2.9 mm × 3.0 mm × 0.85 mm, optimized for space-constrained portable and industrial front panels.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5170BRMZ10 and MCP4017T-103I/OT, AD5228BUJZ10-RL7 uniquely combines tactile-switch simplicity, factory-calibrated tempco, and deterministic power-on behavior-making it optimal for cost-sensitive, maintenance-free manual adjustment where microcontroller resources are constrained or unavailable.

Availability

AD5228BUJZ10-RL7 is available at Aetrix Electronics and suitable for LCD backlight control, LED driver biasing, portable audio volume adjustment, and programmable power supply trimming requiring stable component supply and long-term obsolescence management.

Supply support for AD5228BUJZ10-RL7 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 Norwood, MA.

The AD5228 belongs to Analog Devices' precision digital potentiometer family designed specifically for mechanical trimmer replacement in space-, power-, and reliability-constrained applications across industrial, automotive, and consumer electronics.

FAQ

What is the function of the PRE pin on the AD5228BUJZ10-RL7?

The PRE pin on the AD5228BUJZ10-RL7 determines the power-on wiper position: tying PRE to GND selects midscale (code 16), while tying PRE to VDD selects zero scale (code 0). Floating the PRE pin is strictly prohibited-it results in undefined startup behavior and potential system malfunction. No external pull-up or pull-down is needed because the internal logic senses only the static voltage level at power-up.

Can the AD5228BUJZ10-RL7 operate from a 1.8 V supply?

No, the AD5228BUJZ10-RL7 requires a minimum supply voltage of 2.7 V and operates up to 5.5 V. Operation below 2.7 V is outside specification and may cause erratic debouncing, incomplete wiper switching, or failure to enter autoscan mode. For 1.8 V systems, consider the MCP4017T-103I/OT instead-but note its higher tempco and lack of PRE functionality.

Does the AD5228BUJZ10-RL7 retain its wiper setting after power cycling?

No, the AD5228BUJZ10-RL7 is a volatile digital potentiometer and does not retain wiper position across power cycles. Its setting resets to the state determined by the PRE pin at each power-up. If nonvolatile storage is required, the AD5228BUJZ10-RL7 must be paired with an external microcontroller that reads the current state before shutdown and restores it on wake-up.

What is the maximum continuous current rating for the wiper terminal (W) of the AD5228BUJZ10-RL7?

The AD5228BUJZ10-RL7 wiper terminal (W) supports ±1 mA continuous current when used in rheostat mode with RWB ≤ 5 kΩ and terminal A open. Exceeding this current-especially near zero-scale where wiper resistance dominates-risks switch degradation. Pulse currents up to ±20 mA are allowed briefly, but sustained operation above ±1 mA requires thermal derating and verification against the RAB vs. temperature curve in Figure 18.

How does the AD5228BUJZ10-RL7 handle mechanical switch bounce?

The AD5228BUJZ10-RL7 incorporates an adaptive hardware debouncer that monitors PU/PD low-time duration: signals shorter than ~7 ms are ignored as bounce, while logic-low periods exceeding ~11 ms trigger a single step increment or decrement. This eliminates need for external RC filters or firmware debouncing, and accommodates standard tactile switches with ≤10 ms bounce time-verified per KRS-3550 switch characterization in the datasheet.