Dual, 256-Position, I2C-Compatible
Digital Potentiometers
Data Sheet
AD5243/AD5248
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
A1
W1
B1
A2
W2
B2
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
Fast settling time: tS = 5 µs typical on power-up
Full read/write of wiper register
V
DD
Power-on preset to midscale
WIPER
WIPER
REGISTER 1
REGISTER 2
Extra package address decode pins: AD0 and AD1 (AD5248 only)
Computer software replaces microcontroller in factory
programming applications
GND
AD5243
Single supply: 2.7 V to 5.5 V
Low temperature coefficient: 35 ppm/°C
Low power: IDD = 6 µA maximum
SDA
SCL
PC INTERFACE
Wide operating temperature: −40°C to +125°C
Evaluation board available
Figure 1. AD5243
W1
B1
W2
B2
APPLICATIONS
Systems calibrations
Electronics level settings
V
Mechanical trimmers replacement in new designs
Permanent factory PCB setting
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
DD
RDAC
REGISTER 1
RDAC
REGISTER 2
GND
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
AD0
AD1
ADDRESS
DECODE
AD5248
8
SDA
SCL
SERIAL INPUT
REGISTER
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 through the
I2C-compatible digital interface. The AD5248 has extra package
address decode 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
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/AD5258 at the factory,
Analog Devices, Inc., offers device programming software running
on Windows® NT/2000/XP operating systems. This software
effectively replaces the need for external I2C 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.
1 The terms digital potentiometer, VR, and RDAC are used interchangeably.
Rev. B
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