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Analog Devices Semiconductor Electronic Components Datasheet

AD5161 Datasheet

256-Position SPI/I2C Selectable Digital Potentiometer

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AD5161 pdf
Data Sheet
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
Gain control and offset adjustment
GENERAL DESCRIPTION
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.
256-Position SPI/I2C Selectable
Digital Potentiometer
AD5161
FUNCTIONAL BLOCK DIAGRAM
VDD SDO/NC
SDI/SDA
CLK/SCL
DIS
CS/AD0
SPI OR I2C
INTERFACE
A
W
WIPER
REGISTER
B
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.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2003–2012 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD5161 Datasheet

256-Position SPI/I2C Selectable Digital Potentiometer

No Preview Available !

AD5161 pdf
AD5161
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Pin Configuration............................................................................. 1
Revision History ............................................................................... 2
Electrical Characteristics—5 kΩ Version...................................... 3
Electrical Characteristics—10 kΩ, 50 kΩ, 100 kΩ Versions....... 4
Timing Characteristics—5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ Versions 5
Absolute Maximum Ratings1 .......................................................... 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Test Circuits..................................................................................... 12
REVISION HISTORY
8/12—Rev. A to Rev. B
Changes to Applications Section .................................................... 1
Updated Outline Dimensions ....................................................... 19
4/09—Rev. 0 to Rev. A
Changes to Ordering Guide .......................................................... 19
5/03—Revision 0: Initial Version
Data Sheet
SPI Interface .................................................................................... 13
I2C Interface .................................................................................... 14
Theory of Operation ...................................................................... 15
Programming the Variable Resistor......................................... 15
Programming the Potentiometer Divider............................... 16
Pin Selectable Digital Interface................................................. 16
Level Shifting for Bidirectional Interface ................................ 18
ESD Protection ........................................................................... 18
Terminal Voltage Operating Range ......................................... 18
Power-Up Sequence ................................................................... 18
Layout and Power Supply Bypassing ....................................... 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 19
Rev. B | Page 2 of 20


Part Number AD5161
Description 256-Position SPI/I2C Selectable Digital Potentiometer
Maker Analog Devices
Total Page 20 Pages
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