AD5228

Features:

32-position digital potentiometer
10 kΩ, 50 kΩ, 100 kΩ end-to-end terminal resistance
Simple manual up/down control
Self-contained, requires only 2 pushbutton tactile switches
Built-in adaptive debouncer
Discrete step-up/step-down control
Autoscan up/down control with 4 steps per second
Pin-selectable zero-scale/midscale preset
Low potentiometer mode tempco, 5 ppm/°C
Low rheostat mode tempco, 35 ppm/°C
Digital control compatible
Ultralow power, IDD = 0.4 µA typ and 3 µA max
Low operating voltage, 2.7 V to 5.5 V
Automotive temperature range, −40°C to +105°C
Compact thin SOT-23-8 (2.9 mm × 3 mm) Pb-free package




Application

Mechanical potentiometer and trimmer replacements
LCD backlight, contrast, and brightness controls
Digital volume control
Portable device-level adjustments
Electronic front panel-level controls
Programmable power supply




Pinout






Specifications

VDD to GND−0.3 V, +7 V
VA, VB, VW to GND0 V, VDD
PU, PD, PRE Voltage to GND 0 V, VDD
Maximum Current
IWB, IWA Pulsed ±20 mA
IWB Continuous (RWB 5 kΩ, A open)¹ ±1 mA
IWA Continuous (RWA 5 kΩ, B open)¹±1 mA
IAB Continuous ±500 µA/±100 µA/
(RAB = 10 kΩ/50 kΩ/100 kΩ)¹ ±50 µA

Operating Temperature Range−40°C to +105°C
Maximum Junction Temperature
(TJmax)150°C
Storage Temperature −65°C to +150°C
Lead Temperature245°C
(Soldering, 10 s 30 s)
Thermal Resistance² _JA 230°C/W

Description

The AD5228 is Analog Devices' latest 32-step-up/step-downcontrol digital potentiometer emulating mechanical potentiometer operation1 . Its simple up/down control interface allowsmanual control with just two external pushbutton tactile switches. The AD5228 is designed with a built-i adaptivedebouncer that ignores invalid bounces due to contact bounce commonly found in mechanical switches. The debouncer is adaptive, accommodating a variety of pushbutton tactile switches that generally have less than 10 ms of bounce time during contact closures. When choosing the switch, the user should consult the timing specification of the switch to ensure its suitability in an AD5228 application.