AD5222BRU1M Analog Devices Inc, AD5222BRU1M Datasheet

AD5222BRU1M

Manufacturer Part Number

AD5222BRU1M

Description

IC DGTL POT DUAL 128POS 14-TSSOP

Manufacturer

Analog Devices Inc

Datasheet

1.AD5222BRUZ10-REEL7.pdf (10 pages)

Specifications of AD5222BRU1M

Rohs Status

RoHS non-compliant

Taps

128

Resistance (ohms)

Number Of Circuits

Temperature Coefficient

35 ppm/°C Typical

Memory Type

Volatile

Interface

Up/Down Counter

Voltage - Supply

2.7 V ~ 5.5 V, ±2.3 V ~ 2.7 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

14-TSSOP

Resistance In Ohms

1.00M

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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

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AD5222BRU1M Summary of contents

Page 1

FEATURES 128-Position, 2-Channel Potentiometer Replacement 100 Very Low Power Max 2.7 V Dual Supply Operation or 2 5.5 V Single Supply Operation Increment/Decrement Count Control ...

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

... AD5222BRU10 AD5222BR50 AD5222BRU50 50 AD5222BR100 100 AD5222BRU100 100 AD5222BR1M 1,000 –40 C/+85 C AD5222BRU1M 1,000 –40 C/+85 C max – The AD5222 die size is 56 mil 2.1677 sq. mm. Contains 1503 transistors. Patent Number 5495245 applies. PIN FUNCTION DESCRIPTIONS Pin Name Description Terminal RDAC #1. ...

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

AD5222 OPERATION The AD5222 provides a 128-position, digitally-controlled, variable resistor (VR) device. Changing the VR settings is accomplished by pulsing the CLK pin while CS is active low. The U/D (UP/ DOWN) control input pin controls the direction of the ...

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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