AD5161 Datasheet, PDF (1/20 Pages) Analog Devices – 256-Position SPI/I2C Selectable Digital Potentiometer

FEATURES
256-position
End-to-end resistance 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Compact MSOP-10 (3 mm × 4.9 mm) package
Pin selectable SPI/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
SDO output allows multiple device daisy-chaining
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 AD5161 provides a compact 3 mm × 4.9 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 a pin selectable SPI
or I²C compatible digital interface, which can also be used to
read back the wiper register content. When the SPI mode is
used, the device can be daisy-chained (SDO to SDI), allowing
several parts to share the same control lines. In the I²C mode,
address pin AD0 can be used to place up to two devices on the
same bus. In this same mode, 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.
Rev. 0
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256-Position SPI/I²C Selectable
Digital Potentiometer
AD5161
FUNCTIONAL BLOCK DIAGRAM
V_DD
SDO/NC
SDI/SDA
A
CLK/SCL
SPI OR I²C
INTERFACE
DIS
CS/AD0
W
WIPER
B
REGISTER
GND
Figure 1.
PIN CONFIGURATION
A1
10 W
B 2 AD5161 9 VDD
CS/ADO 3 _{TOP VIEW} 8 DIS
SDO/NC 4 ^{(Not to Scale)} 7 GND
SDI/SDA 5
6 CLK/SCL
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.
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