AD5246BKSZ100-RL7 Datasheet, PDF (1/16 Pages) Analog Devices – 128-Position I2C-Compatible Digital Resistor

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
I²C® 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, IDD = 0.9 µA at 3.3 V typical
Wide operating temperature –40°C to +125°C
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
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 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
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.
128-Position I²C-Compatible
Digital Resistor
AD5246
FUNCTIONAL BLOCK DIAGRAM
V_DD
SCL
SDA
I²C INTERFACE
WIPER
REGISTER
A
W
B
GND
Figure 1.
Rev. C
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