AD5245 Datasheet, PDF (1/16 Pages) Analog Devices – 256-Position I2C Compatible Digital Potentiometer

FEATURES
256-position
End-to-end resistance 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Compact SOT-23-8 (2.9 mm × 3 mm) package
I²C® compatible interface
Extra package address decode pin AD0
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 = 8 µA
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
Automotive electronics adjustment
Gain control and offset adjustment
GENERAL OVERVIEW
The AD5245 provides a compact 2.9 mm × 3 mm packaged
solution for 256-position adjustment applications. These devices
perform the same electronic adjustment function as mechanical
potentiometers or variable resistors, with enhanced resolution,
solid-state reliability, and superior low temperature coefficient
performance.
The wiper settings are controllable through an I²C compatible
digital interface, which can also be used to read back the wiper
register content. AD0 can be used to place up to two devices on
the same bus. Command bits are available to reset the wiper
position to midscale or to shut down the device into a state of
zero power consumption.
Operating from a 2.7 V to 5.5 V power supply and consuming
less than 5 µA allows for usage in portable battery-operated
applications.
256-Position I²C Compatible
Digital Potentiometer
AD5245
FUNCTIONAL BLOCK DIAGRAM
V_DD
A
SCL
I²C INTERFACE
SDA
AD0
W
WIPER
B
REGISTER
GND
Figure 1.
PIN CONFIGURATION
W1
8A
V_DD 2
GND 3
SCL 4
AD5245
TOP VIEW
(Not to Scale)
7B
6 AD0
5 SDA
Figure 2.
Note:
The terms digital potentiometer, VR, and RDAC are used interchangeably.
Purchase of licensed I²C components of Analog Devices or one of its sublicensed
Associated Companies conveys a license for the purchaser under the Philips I²C
Patent Rights to use these components in an I²C system, provided that the system
conforms to the I²C Standard Specification as defined by Philips.
Rev. 0
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