EVAL-AD5222SDZ Analog Devices, EVAL-AD5222SDZ Datasheet

EVAL-AD5222SDZ

Manufacturer Part Number

EVAL-AD5222SDZ

Description

Digital Potentiometer Development Tools EVALUATION BOARD

Manufacturer

Analog Devices

Series

AD5222r

Datasheet

1.EVAL-AD5222SDZ.pdf (10 pages)

Specifications of EVAL-AD5222SDZ

Rohs

yes

Product

Evaluation Boards

Tool Is For Evaluation Of

AD5222

Resistance

10 kOhms/50 kOhms/100 kOhms/1 MOhms

Operating Supply Voltage

5.4 V

Interface Type

Up/Down

Maximum Operating Temperature

+ 85 C

Factory Pack Quantity

For Use With

Sim DAC Web Tool

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GENERAL DESCRIPTION

The AD5222 provides a dual channel, 128-position, digitally

controlled variable-resistor (VR) device. This device performs

the same electronic adjustment function as a potentiometer or

variable resistor. These products were optimized for instrument

and test equipment push-button applications. Choices between

bandwidth or power dissipation are available as a result of the

wide selection of end-to-end terminal resistance values.

The AD5222 contains two fixed resistors with wiper contacts that

tap the fixed resistor value at a point determined by a digitally

controlled up/down counter. The resistance between the wiper

and either end point of the fixed resistor provides a constant

resistance step size that is equal to the end-to-end resistance

divided by the number of positions (e.g., R

78 ). The variable resistor offers a true adjustable value of

resistance, between Terminal A and the wiper, or Terminal B

and the wiper. The fixed A-to-B terminal resistance of 10 k ,

50 k , 100 k , or 1 M has a nominal temperature coefficient

of –35 ppm/ C.

The chip select CS, count CLK and U/D direction control inputs

set the variable resistor position. The MODE determines whether

both VRs are incremented together or independently. With

MODE at logic zero, both wipers are incremented UP or DOWN

without changing the relative settings between the wipers. Also,

the relative ratio between the wipers is preserved if either wiper

reaches the end of the resistor array. In the independent MODE

(Logic 1) only the VR determined by the DACSEL pin is changed.

DACSEL (Logic 0) changes RDAC 1. These inputs, which con-

trol the internal up/down counter, can be easily generated with

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

FEATURES

128-Position, 2-Channel

Potentiometer Replacement

10 k , 50 k , 100 k , 1 M

Very Low Power: 40 A Max

Increment/Decrement Count Control

APPLICATIONS

Stereo Channel Audio Level Control

Mechanical Potentiometer Replacement

Remote Incremental Adjustment Applications

Instrumentation: Gain, Offset Adjustment

Programmable Voltage-to-Current Conversion

Line Impedance Matching

2.7 V Dual Supply Operation or

2.7 V to 5.5 V Single Supply Operation

STEP

= 10 k /128 =

mechanical or push-button switches (or other contact closure

devices). This simple digital interface eliminates the need for

microcontrollers in front panel interface designs.

The AD5222 is available in the surface-mount (SO-14) package.

For ultracompact solutions, selected models are available in the

thin TSSOP-14 package. All parts are guaranteed to operate

over the extended industrial temperature range of –40 C to

+85 C. For 3-wire, SPI-compatible interface applications, see

the AD5203/AD5204/AD5206, AD7376, and AD8400/AD8402/

AD8403 products.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

DACSEL

Figure 1. Typical Push-Button Control Application

MODE

GND

CLK

INCREMENT

U/D

Dual Digital Potentiometer

U/D

FUNCTIONAL BLOCK DIAGRAM

AD5222

ENABLE

SELECT

POR

DAC

AND

Increment/Decrement

World Wide Web Site: http://www.analog.com

UP/DOWN

COUNTER

UP/DOWN

COUNTER

MODE

U/D

CLK

DACSEL

GND

DECODE

AD5222

Related parts for EVAL-AD5222SDZ

EVAL-AD5222SDZ Summary of contents

Page 1

... DACSEL (Logic 0) changes RDAC 1. These inputs, which con- trol the internal up/down counter, can be easily generated with 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 which may result from its use ...

Page 2

AD5222–SPECIFICATIONS Parameter DC CHARACTERISTICS RHEOSTAT MODE (Specifications Apply to All VRs) 2 Resistor Differential NL 2 Resistor Nonlinearity Nominal Resistor Tolerance Resistance Temperature Coefficient 3 Wiper Resistance Nominal Resistance Match DC CHARACTERISTICS POTENTIOMETER DIVIDER MODE (Specifications Apply to All VRs) ...

Page 3

ABSOLUTE MAXIMUM RATINGS ( unless otherwise noted GND . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 4

AD5222–Typical Performance Characteristics 100 CODE – Decimal Figure 3. Wiper-To-End Terminal Resistance vs. Code 4 3 2.5 2 ...

Page 5

VERSION 60 10k VERSION 50 40 100k VERSION 30 50k VERSION –10 –20 – CODE – Decimal Figure Potentiometer Mode Tempco WB 120 100 100k VERSION ...

Page 6

AD5222 1200 A – 5.5V DD CODE = 15 H 1000 B – 3.3V DD CODE = – 5.5V DD CODE = 3F 800 H D – 3.3V DD ...

Page 7

DUT 1LSB = V+/128 Figure 21. Potentiometer Divider Nonlinearity Error Test Circuit (INL, DNL) NO CONNECT DUT Figure 22. Resistor Position Nonlinearity Error (Rheostat Operation; R-INL, R-DNL) = ...

Page 8

... UP/DOWN counter register, Figure 30. Standard logic families work well. If mechanical switches are used for product evaluation a flip-flop or other suitable means should debounce them. When CS is taken active low, the clock begins to increment or decrement the internal up/down counter, depen- dent upon the state of the U/D control pin ...

Page 9

PROGRAMMING THE VARIABLE RESISTOR Rheostat Operation The nominal resistance of the RDAC between Terminals A and B are available with values 100 k , and 1 M The final three characters of the ...

Page 10

AD5222 14-Lead Narrow Body SOIC (R-14) 0.3444 (8.75) 0.3367 (8.55 0.2440 (6.20) 0.1574 (4.00) 0.1497 (3.80) 0.2284 (5.80 PIN 1 0.0688 (1.75) 0.050 (1.27) 0.0532 (1.35) BSC 0.0098 (0.25) 0.0192 (0.49) SEATING 0.0099 (0.25) PLANE 0.0040 ...

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