256-/1024-Position, DigiPOT+ Potentiometers with

Maximum ±1% R-Tolerance Error and 20-TP Memory

AD5291/AD5292

Rev. 0

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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

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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

FUNCTIONAL BLOCK DIAGRAM

RDAC

DATA

SERIAL

INTERFACE

SYNC

SCLK

DIN

POWER-ON

RESET

OTP

MEMORY

BLOCK

LOGIC

SDO

EXT_CAP

GND

AD5291/

AD5292

RESET

RDY

07674-001

Figure 1.

GENERAL DESCRIPTION

The AD5291/AD5292, members of the Analog Devices, Inc.,

DigiPOT+ family of potentiometers, are single-channel, 256-/

1024-position digital potentiometers

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.

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.

AD5291/AD5292

Rev. 0 | Page 2 of 28

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

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

REVISION HISTORY

5/09—Revision 0: Initial Version

AD5291/AD5292

Rev. 0 | Page 3 of 28

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS—AD5291

= 21 V to 33 V, V

= 0 V; V

= 10.5 V to 16.5 V, V

= −10.5 V to −16.5 V; V

LOGIC

= 2.7 V to 5.5 V, V

= V

, V

= V

−40°C < T

< +105°C, unless otherwise noted.

Table 1.

Parameter Symbol Conditions Min Typ

Max Unit

DC CHARACTERISTICS—RHEOSTAT MODE

Resolution N 8 Bits

Resistor Differential Nonlinearity

R-DNL R

, V

= NC −1 +1 LSB

Resistor Integral Nonlinearity

R-INL −1 +1 LSB

Nominal Resistor Tolerance (R-Perf Mode

) ∆R

See Table 2 −1 0.5 +1 %

Nominal Resistor Tolerance (Normal Mode) ∆R

±20 %

Resistance Temperature Coefficient

(∆R

)/∆T × 10

35 ppm/°C

Wiper Resistance R

60 100 Ω

DC CHARACTERISTICS—POTENTIOMETER

DIVIDER MODE

Resolution N 8 Bits

Differential Nonlinearity

DNL −1 +1 LSB

Integral Nonlinearity

INL −0.5 +0.5 LSB

Voltage Divider Temperature

Coefficient

(∆V

)/∆T × 10

Code = half scale 1.5 ppm/°C

Full-Scale Error V

WFSE

Code = full scale −2 0 LSB

Zero-Scale Error V

WZSE

Code = zero scale 0 2 LSB

RESISTOR TERMINALS

Terminal Voltage Range

, V

Capacitance A, Capacitance B

, C

f = 1 MHz, measured to GND,

code = half scale

85 pF

Capacitance W

f = 1 MHz, measured to GND,

code = half scale

65 pF

Common-Mode Leakage Current

= V

±1 nA

DIGITAL INPUTS JEDEC compliant

Input Logic High

LOGIC

= 2.7 V to 5.5 V 2.0 V

Input Logic Low

LOGIC

= 2.7 V to 5.5 V 0.8 V

Input Current I

= 0 V or V

LOGIC

±1 μA

Input Capacitance

5 pF

DIGITAL OUTPUTS (SDO and RDY)

Output High Voltage

PULL_UP

= 2.2 kΩ to V

LOGIC

− 0.4 V

Output Low Voltage

PULL_UP

= 2.2 kΩ to V

LOGIC

GND + 0.4 V V

Tristate Leakage Current −1 +1 μA

Output Capacitance

5 pF

POWER SUPPLIES

Single-Supply Power Range V

= 0 V 9 33 V

Dual-Supply Power Range V

±9 ±16.5 V

Positive Supply Current I

= ±16.5 V 0.1 2 μA

Negative Supply Current I

= ±16.5 V −2 −0.1 μA

Logic

Supply Range V

LOGIC

2.7 5.5 V

Logic Supply Current I

LOGIC

= 5 V; V

= 5 V or V

= GND 1 10 μA

OTP Store Current

4, 7

LOGIC_PROG

= 5 V or V

= GND 25 mA

OTP Read Current

4, 8

LOGIC_FUSE_READ

= 5 V or V

= GND 25 mA

Power Dissipation

DISS

= 5 V or V

= GND 8 110 μW

Power Supply Rejection Ratio

PSSR ∆V

/∆V

= ±15 V ± 10% 0.025 0.08 %/%

Part #	AD5292BRUZ-20
Description	1024 TAP, 1% DIGIPOT WITH SPIINTERFACE -
Category	IC
Availability	Out of Stock
Qty	0

AD5292BRUZ-20

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