AD5243 Analog Devices Data Sheet Manual

Dual 256-Position I2C Compatible

Digital Potentiometer

AD5243/AD5248 FEATURES FUNCTIONAL BLOCK DIAGRAMS

2-channel, 256-position A1 W1 B1 A2 W2 B2

End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ Compact MSOP-10 (3 mm × 4.9 mm) package Fast settling time: t S = 5 µs typ on power-up

Full read/write of wiper register VDD

Power-on preset to midscale WIPER WIPER

REGISTER 1 REGISTER 2

Extra package address decode pins AD0 and AD1 (AD5248

only) Computer software replaces µC in factory programming

AD5243

applications

Single supply: 2.7 V to 5.5 V PC INTERFACE

Low temperature coefficient: 35 ppm/°C Low power: IDD = 6 µA max Figure 1. AD5243 Wide operating temperature: −40°C to +125°C

Evaluation board available

APPLICATIONS Systems calibrations

Electronics level settings RDAC RDAC REGISTER 1 REGISTER 2

Mechanical Trimmers® replacement in new designs

Permanent factory PCB setting

Transducer adjustment of pressure, temperature, position, www.BDTIC.com/ADI

AD0 ADDRESS

chemical, and optical sensors DECODE

AD1 AD5248

RF amplifier biasing

SERIAL INPUT

Automotive electronics adjustment

SCL REGISTER

Gain control and offset adjustment

Figure 2. AD5248

GENERAL DESCRIPTION The AD5243 and AD5248 provide a compact 3 mm × 4.9 mm Operating from a 2.7 V to 5.5 V power supply and consuming packaged solution for dual 256-position adjustment applica- less than 6 µA allows for usage in portable battery-operated

tions. These devices perform the same electronic adjustment applications. 9- 0- 9- 0-

function as a 3-terminal mechanical potentiometer (AD5243)

For applications that program the AD5243/AD5258 at the

or a 2-terminal variable resistor (AD5248). Available in four

factory, Analog Devices offers device programming software

different end-to-end resistance values (2.5 kΩ, 10 kΩ, 50 kΩ,

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

and 100 kΩ), these low temperature coefficient devices are ideal

software effectively replaces any external I2C controllers, which

for high accuracy and stability variable resistance adjustments.

in turn enhances users’ systems time-to-market. An AD5243/

The wiper settings are controllable through the I2C compatible

AD5248 evaluation kit and software are available. The kit

digital interface. The AD5248 has extra package address decode

includes a cable and instruction manual.

pins AD0 and AD1, allowing multiple parts to share the same I2C 2-wire bus on a PCB. The resistance between the wiper and either endpoint of the fixed resistor varies linearly with respect to the digital code transferred into the RDAC latch.1

1The terms digital potentiometer, VR, and RDAC are used interchangeably.

Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use.

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Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and Tel: 781.329.4700 www.analog.com registered trademarks are the property of their respective owners. Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.