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Analog Devices Semiconductor Electronic Components Datasheet

AD5122 Datasheet

(AD5122 / AD5142) Nonvolatile Digital Potentiometer

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AD5122 pdf
Data Sheet
Dual Channel, 128-/256-Position, SPI,
Nonvolatile Digital Potentiometer
AD5122/AD5142
FEATURES
10 kΩ and 100 kΩ resistance options
Resistor tolerance: 8% maximum
Wiper current: ±6 mA
Low temperature coefficient: 35 ppm/°C
Wide bandwidth: 3 MHz
Fast start-up time < 75 µs
Linear gain setting mode
Single- and dual-supply operation
Independent logic supply: 1.8 V to 5.5 V
Wide operating temperature: −40°C to +125°C
3 mm × 3 mm package option
4 kV ESD protection
APPLICATIONS
Portable electronics level adjustment
LCD panel brightness and contrast controls
Programmable filters, delays, and time constants
Programmable power supplies
GENERAL DESCRIPTION
The AD5122/AD5142 potentiometers provides a nonvolatile
solution for 128-/256-position adjustment applications, offering
guaranteed low resistor tolerance errors of ±8% and up to ±6 mA
current density in the Ax, Bx, and Wx pins.
The low resistor tolerance and low nominal temperature coefficient
simplify open-loop applications as well as applications requiring
tolerance matching.
The linear gain setting mode allows independent programming
of the resistance between the digital potentiometer terminals,
through the RAW and RWB string resistors, allowing very accurate
resistor matching.
The high bandwidth and low total harmonic distortion (THD)
ensure optimal performance for ac signals, making these
devices suitable for filter design.
The low wiper resistance of only 40 Ω at the ends of the resistor
array allows for pin-to-pin connection.
The wiper values can be set through an SPI-compatible digital
interface that is also used to read back the wiper register and
EEPROM contents.
The AD5122/AD5142 is available in a compact, 16-lead, 3 mm ×
3 mm LFCSP and a 16-lead TSSOP. The parts are guaranteed to
operate over the extended industrial temperature range of −40°C
to +125°C.
FUNCTIONAL BLOCK DIAGRAM
VLOGIC
VDD
INDEP
POWER-ON
RESET
AD5122/
AD5142
RESET
SCLK
SDI
SYNC
SDO
SERIAL
INTERFACE 7/8
RDAC1
INPUT
REGISTER 1
RDAC2
INPUT
REGISTER 2
EEPROM
MEMORY
A1
W1
B1
A2
W2
B2
GND VSS
Figure 1.
Table 1. Family Models
Model
Channel Position
AD51231 Quad
128
AD5124 Quad
128
AD5124 Quad
128
AD51431 Quad
256
AD5144 Quad
256
AD5144 Quad
256
AD5144A Quad
256
AD5122 Dual
128
AD5122A Dual
128
AD5142 Dual
256
AD5142A Dual
256
AD5121 Single
128
AD5141 Single
256
Interface
I2C
SPI/I2C
SPI
I2C
SPI/I2C
SPI
I2C
SPI
I2C
SPI
I2C
SPI/I2C
SPI/I2C
Package
LFCSP
LFCSP
TSSOP
LFCSP
LFCSP
TSSOP
TSSOP
LFCSP/TSSOP
LFCSP/TSSOP
LFCSP/TSSOP
LFCSP/TSSOP
LFCSP
LFCSP
1 Two potentiometers and two rheostats.
Rev. 0
Document Feedback
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
©2012 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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Analog Devices Semiconductor Electronic Components Datasheet

AD5122 Datasheet

(AD5122 / AD5142) Nonvolatile Digital Potentiometer

No Preview Available !

AD5122 pdf
AD5122/AD5142
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics—AD5122 .......................................... 3
Electrical Characteristics—AD5142 .......................................... 6
Interface Timing Specifications.................................................. 9
Shift Register and Timing Diagrams ....................................... 10
Absolute Maximum Ratings.......................................................... 11
Thermal Resistance .................................................................... 11
ESD Caution................................................................................ 11
Pin Configurations and Function Descriptions ......................... 12
Typical Performance Characteristics ........................................... 14
Test Circuits..................................................................................... 19
REVISION HISTORY
10/12—Revision 0: Initial Version
Data Sheet
Theory of Operation ...................................................................... 20
RDAC Register and EEPROM.................................................. 20
Input Shift Register .................................................................... 20
SPI Serial Data Interface............................................................ 20
Advanced Control Modes ......................................................... 23
EEPROM or RDAC Register Protection ................................. 24
INDEP Pin................................................................................... 24
RDAC Architecture.................................................................... 27
Programming the Variable Resistor......................................... 27
Programming the Potentiometer Divider............................... 28
Terminal Voltage Operating Range ......................................... 28
Power-Up Sequence ................................................................... 28
Layout and Power Supply Biasing ............................................ 28
Outline Dimensions ....................................................................... 29
Ordering Guide .......................................................................... 30
Rev. 0 | Page 2 of 32
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Part Number AD5122
Description (AD5122 / AD5142) Nonvolatile Digital Potentiometer
Maker Analog Devices
Total Page 30 Pages
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