AD5227

Features:

64-position digital potentiometer
10 kΩ, 50 kΩ, 100 kΩ end-to-end terminal resistance
Simple up/down digital or manual configurable control
Midscale preset
Low potentiometer mode tempco = 10 ppm/°C
Low rheostat mode tempco = 35 ppm/°C
Ultralow power, IDD = 0.4 µA typ and 3 µA max
Fast adjustment time, ts = 1 µs
Chip select enable multiple device operation
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
Portable electronics level adjustment
Programmable power supply
Digital trimmer replacements
Automatic closed-loop control




Pinout






Specifications



VDD to GND−0.3 V, +7 V
VA, VB, VW to GND0 V, VDD
Digital Input Voltage to GND (CS, CLK, U/D)0 V, VDD
Maximum Current
IWB, IWA Pulsed ±20 mA
IWB Continuous (RWB 5 kΩ, A open) ±1 mA
IWA Continuous (RWA 5 kΩ, B open)±1 mA
IAB Continuous
(RAB = 10 kΩ/50 kΩ/100 kΩ)±500 µA/
±100 µA/±50 µA
Operating Temperature Range−40°C to +105°C
Maximum Junction Temperature (TJmax)150°C
Storage Temperature −65°C to +150°C
Lead Temperature (Soldering, 10 s 30 s)245°C
Thermal Resistance2JA230°C/W




Description

The AD5227 is Analog Devices' latest 64-step up/down control digital potentiometer¹. This device performs the same electronic adjustment function as a 5 V potentiometer or variable

The AD5227 is Analog Devices' latest 64-step up/down control digital potentiometer1 . This device performs the same electronicadjustment function as a 5 V potentiometer or variable resistor. Its simple 3-wire up/down interface allows manual switching or high speed digital control. The AD5227 presets to midscale at power-up. When CS is enabled, the devices changes step at every clock pulse. The direction is determined by the state of the U/D pin (see Table 1). The interface is simple to activate by any host controller, discrete logic, or manually with a rotary encoder or pushbuttons. The AD5227's 64-step resolution, small footprint, and simple interface enable it to replace mechanical potentiometers and trimmers with typically 6* improved resolution, solid-state reliability, and design layout flexibility, resulting in a considerable cost savings in end users' systems.

The AD5227 is available in a compact thin SOT-23-8 (TSOT-8) Pb-free package. The part is guaranteed to operate over the automotive temperature range of −40°C to +105°C. Users who consider EEMEM potentiometers should refer to some recommendations in the Applications section.