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Analog Devices Semiconductor Electronic Components Datasheet

AD5292 Datasheet

(AD5291 / AD5292) Digital Potentiometer

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256-/1024-Position, DigiPOT+ Potentiometers with
Maximum ±1% R-Tolerance Error and 20-TP Memory
AD5291/AD5292
FEATURES
Single-channel, 256-/1024-position resolution
20 kΩ nominal resistance
Calibrated ±1% nominal resistor tolerance (resistor
performance mode)
20-time programmable (20-TP) set-and-forget resistance
setting allows multiple time permanent programming
Rheostat mode temperature coefficient: 35 ppm/°C
Voltage divider temperature coefficient: 5 ppm/°C
+9 V to +33 V single-supply operation
±9 V to ±16.5 V dual-supply operation
SPI-compatible serial interface
Wiper setting readback
Power-on refreshed from 20-TP memory
APPLICATIONS
Mechanical potentiometer replacement
Instrumentation: gain and offset adjustment
Programmable voltage-to-current conversion
Programmable filters, delays, and time constants
Programmable power supply
Low resolution DAC replacement
Sensor calibration
VLOGIC
SCLK
SYNC
DIN
SDO
RDY
FUNCTIONAL BLOCK DIAGRAM
VDD RESET
POWER-ON
RESET
AD5291/
AD5292
SERIAL DATA
INTERFACE
RDAC
REGISTER
OTP
MEMORY
BLOCK
A
W
B
VSS EXT_CAP
Figure 1.
GND
GENERAL DESCRIPTION
The AD5291/AD5292, members of the Analog Devices, Inc.,
DigiPOT+ family of potentiometers, are single-channel, 256-/
1024-position digital potentiometers1 that combine industry
leading variable resistor performance with nonvolatile memory
(NVM) in a compact package. These devices are capable of
operating across a wide voltage range; supporting both dual
supply operation at ±10.5 V to ±16.5 V and single supply
operation at +21 V to +33 V, while ensuring less than 1% end-
to-end resistor tolerance (R-tolerance) error and offering
20-time programmable (20-TP) memory.
The guaranteed industry-leading low resistor tolerance error
feature simplifies open-loop applications as well as precision
calibration and tolerance matching applications.
1 The terms digital potentiometer and RDAC are used interchangeably.
The AD5291/AD5292 device wiper settings are controllable
through the SPI digital interface. Unlimited adjustments are
allowed before programming the resistance value into the
|20-TP memory. The AD5291/AD5292 do not require any
external voltage supply to facilitate fuse blow and there are
20 opportunities for permanent programming. During 20-TP
activation, a permanent blow fuse command freezes the wiper
position (analogous to placing epoxy on a mechanical trimmer).
The AD5291/AD5292 are available in a compact 14-lead TSSOP
package. The part is guaranteed to operate over the extended
industrial temperature range of −40°C to +105°C.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or 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
©2009 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD5292 Datasheet

(AD5291 / AD5292) Digital Potentiometer

No Preview Available !

AD5292 pdf
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TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
Functional Block Diagram .............................................................. 1 
General Description ......................................................................... 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Electrical Characteristics—AD5291 .......................................... 3 
Resistor Performance Mode Code Range—AD5291............... 4 
Electrical Characteristics—AD5292 .......................................... 5 
Resistor Performance Mode Code Range—AD5292............... 6 
Interface Timing Specifications.................................................. 7 
Timing Diagrams.......................................................................... 8 
Absolute Maximum Ratings............................................................ 9 
Thermal Resistance ...................................................................... 9 
ESD Caution.................................................................................. 9 
Pin Configuration and Function Descriptions........................... 10 
Typical Performance Characteristics ........................................... 11 
Test Circuits..................................................................................... 17 
Theory of Operation ...................................................................... 18 
Serial Data Interface................................................................... 18 
Shift Register ............................................................................... 18 
RDAC Register............................................................................ 18 
REVISION HISTORY
5/09—Revision 0: Initial Version
20-TP Memory ........................................................................... 19 
Write Protection ......................................................................... 19 
Basic Operation .......................................................................... 20 
20-TP Readback and Spare Memory Status ........................... 20 
Shutdown Mode ......................................................................... 21 
Resistor Performance Mode...................................................... 21 
Reset ............................................................................................. 21 
Daisy-Chain Operation ............................................................. 21 
RDAC Architecture.................................................................... 21 
Programming the Variable Resistor......................................... 21 
Programming the Potentiometer Divider............................... 22 
EXT_CAP Capacitor.................................................................. 22 
Terminal Voltage Operating Range ......................................... 23 
Applications Information .............................................................. 24 
High Voltage DAC...................................................................... 24 
Programmable Voltage Source with Boosted Output ........... 24 
High Accuracy DAC .................................................................. 24 
Variable Gain Instrumentation Amplifier .............................. 24 
Audio Volume Control .............................................................. 25 
Outline Dimensions ....................................................................... 26 
Ordering Guide .......................................................................... 26 
Rev. 0 | Page 2 of 28


Part Number AD5292
Description (AD5291 / AD5292) Digital Potentiometer
Maker Analog Devices
Total Page 28 Pages
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