ad5243brm2.5-rl7 Analog Devices, Inc., ad5243brm2.5-rl7 Datasheet

ad5243brm2.5-rl7

Manufacturer Part Number

ad5243brm2.5-rl7

Description

Dual 256-position I2c Compatible Digital Potentiometer

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD5243BRM2.5-RL7.pdf (20 pages)

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FEATURES

2-channel, 256-position

End-to-end resistance: 2.5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ

Compact MSOP-10 (3 mm × 4.9 mm) package

Fast settling time: t

Full read/write of wiper register

Power-on preset to midscale

Extra package address decode pins AD0 and AD1 (AD5248

Computer software replaces µC in factory programming

Single supply: 2.7 V to 5.5 V

Low temperature coefficient: 35 ppm/°C

Low power: I

Wide operating temperature: −40°C to +125°C

Evaluation board available

APPLICATIONS

Systems calibrations

Electronics level settings

Mechanical Trimmers® replacement in new designs

Permanent factory PCB setting

Transducer adjustment of pressure, temperature, position,

RF amplifier biasing

Automotive electronics adjustment

Gain control and offset adjustment

GENERAL DESCRIPTION

The AD5243 and AD5248 provide a compact 3 mm × 4.9 mm

packaged solution for dual 256-position adjustment applica-

tions. These devices perform the same electronic adjustment

function as a 3-terminal mechanical potentiometer (AD5243)

or a 2-terminal variable resistor (AD5248). Available in four

different end-to-end resistance values (2.5 kΩ, 10 kΩ, 50 kΩ,

and 100 kΩ), these low temperature coefficient devices are ideal

for high accuracy and stability variable resistance adjustments.

The wiper settings are controllable through the I

digital interface. The AD5248 has extra package address decode

pins AD0 and AD1, allowing multiple parts to share the same

either endpoint of the fixed resistor varies linearly with respect

to the digital code transferred into the RDAC latch.

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. Trademarks and

registered trademarks are the property of their respective owners.

C 2-wire bus on a PCB. The resistance between the wiper and

only)

applications

chemical, and optical sensors

= 6 µA max

= 5 µs typ on power-up

C compatible

Dual 256-Position I

Operating from a 2.7 V to 5.5 V power supply and consuming

less than 6 µA allows for usage in portable battery-operated

applications.

For applications that program the AD5243/AD5258 at the

factory, Analog Devices offers device programming software

running on Windows® NT/2000/XP operating systems. This

software effectively replaces any external I

in turn enhances users’ systems time-to-market. An AD5243/

AD5248 evaluation kit and software are available. The kit

includes a cable and instruction manual.

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

Tel: 781.329.4700

Fax: 781.326.8703

The terms digital potentiometer, VR, and RDAC are used interchangeably.

GND

SDA

FUNCTIONAL BLOCK DIAGRAMS

SCL

GND

AD0

SDA

AD1

SCL

Digital Potentiometer

ADDRESS

DECODE

WIPER

RDAC

Figure 1. AD5243

Figure 2. AD5248

PC INTERFACE

SERIAL INPUT

AD5243/AD5248

C Compatible

WIPER

RDAC

AD5243

AD5248

C controllers, which

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ad5243brm2.5-rl7 Summary of contents

Page 1

... C Compatible Digital Potentiometer AD5243/AD5248 WIPER WIPER REGISTER 1 REGISTER 2 AD5243 PC INTERFACE Figure 1. AD5243 RDAC RDAC REGISTER 1 REGISTER 2 ADDRESS AD5248 DECODE 8 SERIAL INPUT REGISTER Figure 2. AD5248 2 C controllers, which www.analog.com © 2004 Analog Devices, Inc. All rights reserved. ...

Page 2

AD5243/AD5248 TABLE OF CONTENTS Electrical Characteristics—2.5 kΩ Version ................................... 3 Electrical Characteristics—10 kΩ, 50 kΩ, 100 kΩ Versions ....... 4 Timing Characteristics—All Versions ........................................... 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configurations and Function Descriptions ........................... 7 Typical ...

Page 3

ELECTRICAL CHARACTERISTICS—2.5 kΩ VERSION ± 10 ± 10 Table 1. Parameter DC CHARACTERISTICS—RHEOSTAT MODE 2 Resistor Differential Nonlinearity Resistor Integral Nonlinearity 2 3 Nominal Resistor Tolerance Resistance Temperature ...

Page 4

AD5243/AD5248 ELECTRICAL CHARACTERISTICS—10 kΩ, 50 kΩ, 100 kΩ VERSIONS ± 10 ± 10 Table 2. Parameter DC CHARACTERISTICS—RHEOSTAT MODE 2 Resistor Differential Nonlinearity Resistor Integral Nonlinearity 2 ...

Page 5

TIMING CHARACTERISTICS—ALL VERSIONS ± 10 ± 10 Table 3. Parameter INTERFACE TIMING CHARACTERISTICS SCL Clock Frequency t Bus Free Time between STOP and START BUF t ...

Page 6

AD5243/AD5248 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 4. Parameter V to GND GND Terminal Current Bx Wx Pulsed ...

Page 7

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS AD5243 TOP VIEW GND 4 7 SDA V 6 SCL 5 DD Figure 3. AD5243 Pin Configuration Table 5. AD5243 Pin Function Descriptions ...

Page 8

AD5243/AD5248 TYPICAL PERFORMANCE CHARACTERISTICS 2.0 1.5 1 2. 5.5V DD –0.5 –1.0 –1.5 –2 128 160 CODE (DECIMAL) Figure 5. R-INL vs. Code vs. Supply Voltages 0.5 0.4 0.3 ...

Page 9

–40°C, +25°C, +85°C, +125°C A 1.0 0 5.5V DD –0 –40°C, +25°C, +85°C, +125°C A –1.0 –1.5 –2 128 160 192 CODE (DECIMAL) ...

Page 10

AD5243/AD5248 2. –40°C TO +85°C, –40°C TO +125° – 5. –40°C TO +85°C, –40°C TO +125°C A –20 – ...

Page 11

V = 5. 2.7V DD 0.01 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 DIGITAL INPUT VOLTAGE (V) Figure 23. I vs. Input Voltage SCL Figure 24. Digital Feedthrough V W2 ...

Page 12

AD5243/AD5248 TEST CIRCUITS Figure 29 through Figure 35 illustrate the test circuits that define the test conditions used in the product specification tables DUT 1LSB = V+/ Figure 29. Test Circuit for ...

Page 13

THEORY OF OPERATION The AD5243/AD5248 are 256-position digitally controlled variable resistor (VR) devices. An internal power-on preset places the wiper at midscale during power-on, which simplifies the fault condition recovery at power-up. PROGRAMMING THE VARIABLE RESISTOR AND VOLTAGE Rheostat Operation ...

Page 14

AD5243/AD5248 Typical device-to-device matching is process lot dependent and may vary ±30%. Because the resistance element is processed in thin film technology, the change in R temperature has a very low 35 ppm/°C temperature coefficient. PROGRAMMING THE ...

Page 15

10µF 0.1µF AD5243 Figure 42. Power Supply Bypassing CONSTANT BIAS TO RETAIN RESISTANCE SETTING For users who desire nonvolatility but cannot justify the addi- tional cost for the EEMEM, the AD5243/AD5248 may be ...

Page 16

AD5243/AD5248 INTERFACE COMPATIBLE 2-WIRE SERIAL BUS 2 The 2-wire I C serial bus protocol operates as follows: 1. The master initiates data transfer by establishing a START condition, which is when a high-to-low transition ...

Page 17

Table 9. Write Mode AD5243 Slave Address Byte AD5248 AD1 AD0 W Slave Address Byte Table 10. Read Mode AD5243 ...

Page 18

AD5243/AD5248 1 SCL AD1 AD0 SDA START BY FRAME 1 MASTER SLAVE ADDRESS BYTE 1 SCL 0 SDA START BY MASTER SLAVE ADDRESS BYTE Figure 48. Reading Data from a Previously Selected RDAC Register in ...

Page 19

... OUTLINE DIMENSIONS ORDERING GUIDE Model R AB AD5243BRM2.5 2.5 kΩ AD5243BRM2.5-RL7 2.5 kΩ AD5243BRM10 10 kΩ AD5243BRM10-RL7 10 kΩ AD5243BRM50 50 kΩ AD5243BRM50-RL7 50 kΩ AD5243BRM100 100 kΩ AD5243BRM100-RL7 100 kΩ AD5243EVAL See Note 1 AD5248BRM2.5 2.5 kΩ AD5248BRM2.5-RL7 2.5 kΩ AD5248BRM10 10 kΩ AD5248BRM10-RL7 10 kΩ ...

Page 20

... C components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I 2 Patent Rights to use these components © 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C system, provided that the system conforms to the I D04109– ...

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