Data Sheet
FEATURES
128-position
End-to-end resistance 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Ultracompact SC70-6 (2 mm × 2.1 mm) package
I
2
C® compatible interface
Full read/write of wiper register
Power-on preset to midscale
Single supply 2.7 V to 5.5 V
Rheostat mode temperature coefficient: 45 ppm/°C
Low power, I
DD
= 0.9 µA at 3.3 V typical
Wide operating temperature –40°C to +125°C
128-Position I
2
C-Compatible
Digital Resistor
FUNCTIONAL BLOCK DIAGRAM
V
DD
SCL
I
2
C INTERFACE
SDA
A
W
WIPER
REGISTER
B
GND
APPLICATIONS
Mechanical potentiometer replacement in new designs
Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
Figure 1.
GENERAL OVERVIEW
The AD5246 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 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 I
2
C 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 RDAC
latch.
Operating from a 2.7 V to 5.5 V power supply and consuming
0.9 µA (3.3 V) allows for usage in portable battery-operated
applications.
1
The terms digital potentiometer, VR, and RDAC are used interchangeably
in this document.
Rev. C
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