AD5243BRMZ100 Datasheet, PDF (1/20 Pages) Analog Devices – Dual, 256-Position, I2C-Compatible Digital Potentiometers

Data Sheet
Dual, 256-Position, I²C-Compatible
Digital Potentiometers
AD5243/AD5248
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
Fast settling time: tS = 5 µs typical on power-up
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
Low power: IDD = 6 µA maximum
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 PCB setting
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
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
FUNCTIONAL BLOCK DIAGRAMS
A1 W1 B1
A2 W2 B2
V_DD
GND
SDA
SCL
WIPER
REGISTER 1
WIPER
REGISTER 2
AD5243
PC INTERFACE
Figure 1. AD5243
W1 B1
W2 B2
V_DD
GND
AD0
AD1
SDA
SCL
RDAC
REGISTER 1
RDAC
REGISTER 2
ADDRESS
/ ^DECODE
8
AD5248
SERIAL INPUT
REGISTER
Figure 2. AD5248
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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