AD5247 Datasheet, PDF (1/20 Pages) Analog Devices – 128-Position I2C Compatible Digital Potentiometer

FEATURES
128-position
End-to-end resistance 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Ultracompact SC70-6 (2 mm × 2.1 mm) package
I²C® compatible interface
Full read/write of wiper register
Power-on preset to midscale
Single supply 2.7 V to 5.5 V
Low temperature coefficient 45 ppm/°C
Low power, IDD = 3 µA typical
Wide operating temperature –40°C to +125°C
Evaluation board available
APPLICATIONS
Mechanical potentiometer replacement in new designs
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier biasing
LCD brightness and contrast adjustment
Automotive electronics adjustment
Gain control and offset adjustment
GENERAL OVERVIEW
The AD5247 provides a compact 2 mm × 2.1 mm packaged
solution for 128-position adjustment applications. This device
performs the same electronic adjustment function as a
mechanical potentiometer or a variable resistor. Available in
four different end-to-end resistance values (5 kΩ, 10 kΩ, 50 kΩ,
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, which can also be used to read back the present
wiper register control word. The resistance between the wiper
and either end point of the fixed resistor varies linearly with
respect to the digital code transferred into the RDAC¹ latch.
Operating from a 2.7 V to 5.5 V power supply and consuming
3 µA allows for usage in portable battery-operated applications.
128-Position I²C Compatible
Digital Potentiometer
AD5247
FUNCTIONAL BLOCK DIAGRAM
V_DD
A
SDA
I²C INTERFACE
SCL
W
WIPER
REGISTER
B
GND
Figure 1.
1 _{Note: The terms digital potentiometer, VR, and RDAC are used}
interchangeably in this document.
Rev. 0
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