Digital Potentiometers

Data Sheet

AD5243/AD5248

Rev. C

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FEATURES

2-channel, 256-position potentiometers

End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ

Compact 10-lead MSOP (3 mm × 4.9 mm) package

Full read/write of wiper register

Power-on preset to midscale

Extra package address decode pins: AD0 and AD1 (AD5248 only)

Computer software replaces microcontroller in factory

programming applications

Single supply: 2.7 V to 5.5 V

Low temperature coefficient: 35 ppm/°C

Wide operating temperature: −40°C to +125°C

Evaluation board available

APPLICATIONS

Systems calibrations

Electronics level settings

Mechanical trimmers replacement in new designs

Permanent factory printed circuit board (PCB) setting

Transducer adjustment of pressure, temperature, position,

chemical, and optical sensors

RF amplifier biasing

Gain control and offset adjustment

FUNCTIONAL BLOCK DIAGRAMS

A1

GND

SDA

SCL

W1

WIPER

REGISTER 1

PC INTERFACE

AD5243

B1

A2

W2

WIPER

REGISTER 2

B2

Figure 1. AD5243

GND

SDA

SCL

AD0

AD1

W1

RDAC

REGISTER 1

ADDRESS

DECODE

SERIAL INPUT

REGISTER

AD5248

B1

W2

RDAC

REGISTER 2

B2

Figure 2. AD5248

GENERAL DESCRIPTION

The AD5243 and AD5248 provide a compact 3 mm × 4.9 mm

packaged solution for dual, 256-position adjustment applications.

The AD5243 performs the same electronic adjustment function

as a 3-terminal mechanical potentiometer, and the AD5248

performs the same adjustment function as a 2-terminal variable

resistor. Available in four end-to-end resistance values (2.5 kΩ,

10 kΩ, 50 kΩ, and 100 kΩ), these low temperature coefficient

devices are ideal for high accuracy and stability-variable

resistance adjustments. The wiper settings are controllable

extra package address decode pins, AD0 and AD1, allowing

resistance between the wiper and either endpoint of the fixed

resistor varies linearly with respect to the digital code transferred

into the RDAC latch. (The terms digital potentiometer, VR,

and RDAC are used interchangeably.)

Operating from a 2.7 V to 5.5 V power supply and consuming

less than 6 µA allows the AD5243/AD5248 to be used in

portable battery-operated applications.

For applications that program the AD5243/AD5248 at the

factory, Analog Devices, Inc., offers device programming

software running on Windows® NT/2000/XP operating systems.

controllers, which in turn enhances the time to market of

systems. An AD5243/AD5248 evaluation kit and software are

available. The kit includes a cable and instruction manual.