EVAL-AD5246EBZ Analog Devices Inc, EVAL-AD5246EBZ Datasheet

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EVAL-AD5246EBZ

Manufacturer Part Number
EVAL-AD5246EBZ
Description
EVALUATION BOARD I.C.
Manufacturer
Analog Devices Inc
Datasheet

Specifications of EVAL-AD5246EBZ

Main Purpose
Digital Potentiometer
Embedded
No
Utilized Ic / Part
AD5246
Primary Attributes
1 Channel, 128 Position
Secondary Attributes
I²C Interface
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
128-position
End-to-end resistance 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
Ultracompact SC70-6 (2 mm × 2.1 mm) package
I
Full read/write of wiper register
Power-on preset to midscale
Single supply 2.7 V to 5.5 V
Low temperature coefficient 45 ppm/°C
Low power, I
Wide operating temperature –40°C to +125°C
Evaluation board available
Available in lead-free (Pb-free) package
APPLICATIONS
Mechanical potentiometer replacement in new designs
Transducer adjustment of pressure, temperature, position,
RF amplifier biasing
Automotive electronics adjustment
Gain control and offset adjustment
GENERAL OVERVIEW
The AD5246 provides a compact 2 mm × 2.1 mm packaged
solution for 128-position adjustment applications. This device
performs the same electronic adjustment function as a variable
resistor. Available in four different end-to-end resistance values
(5 kΩ, 10 kΩ, 50 kΩ, 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, which can also be used to read back the present
wiper register control word. The resistance between the wiper
and either end point of the fixed resistor varies linearly with
respect to the digital code transferred into the RDAC
Operating from a 2.7 V to 5.5 V power supply and consuming
3 μA allows for usage in portable battery-operated applications.
1
Rev. B
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.
2
The terms digital potentiometer, VR, and RDAC are used interchangeably
in this document.
C® compatible interface
chemical, and optical sensors
DD
= 3 μA typical
2
C compatible
1
latch.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113© 2003–2009 Analog Devices, Inc. All rights reserved.
128-Position I
SDA
SCL
FUNCTIONAL BLOCK DIAGRAM
I
2
C INTERFACE
REGISTER
WIPER
GND
Figure 1.
V
DD
Digital Resistor
2
C-Compatible
A
www.analog.com
AD5246
W
B

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EVAL-AD5246EBZ Summary of contents

Page 1

... Single supply 2 5.5 V Low temperature coefficient 45 ppm/°C Low power μA typical DD Wide operating temperature –40°C to +125°C Evaluation board available Available in lead-free (Pb-free) package APPLICATIONS Mechanical potentiometer replacement in new designs Transducer adjustment of pressure, temperature, position, chemical, and optical sensors ...

Page 2

... Initial Version Compatible 2-Wire Serial Bus ........................................... 13 Level Shifting for Bidirectional Interface ................................ 14 ESD Protection ........................................................................... 14 Terminal Voltage Operating Range ......................................... 14 Maximum Operating Current .................................................. 14 Power-Up Sequence ................................................................... 14 Layout and Power Supply Bypassing ....................................... 15 Constant Bias to Retain Resistance Setting ............................. 15 Evaluation Board ........................................................................ 15 Outline Dimensions ....................................................................... 16 Ordering Guide .......................................................................... 16 Rev Page ...

Page 3

SPECIFICATIONS ELECTRICAL CHARACTERISTICS—5 kΩ VERSION ± 10 ± 10 Table 1. Parameter DC CHARACTERISTICS—RHEOSTAT MODE 2 Resistor Differential Nonlinearity 2 Resistor Integral Nonlinearity 3 Nominal Resistor Tolerance Resistance ...

Page 4

AD5246 ELECTRICAL CHARACTERISTICS—10 kΩ, 50 kΩ, 100 kΩ VERSIONS ± 10 ± 10 Table 2. Parameter DC CHARACTERISTICS, RHEOSTAT MODE 2 Resistor Differential Nonlinearity 2 Resistor Integral ...

Page 5

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

Page 6

AD5246 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 4. Parameter V to GND GND A W Terminal Current, A–B, A–W, B–W Pulsed 1 Continuous Digital Inputs and Output Voltage to GND ...

Page 7

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 5. Pin Function Descriptions Pin No. Mnemonic GND 3 SCL 4 SDA AD5246 GND W 2 TOP VIEW 5 (Not to ...

Page 8

AD5246 TYPICAL PERFORMANCE CHARACTERISTICS 1.0 0.8 0 2.7V DD 0.4 0 5.5V DD –0.2 –0.4 –0.6 –0.8 –1 CODE (Decimal) Figure 3. R-INL vs. Code vs. Supply Voltages 0.5 0.4 ...

Page 9

DIGITAL INPUTS = 0V CODE = 0x40 5. 0.1 0.01 –40 –25 – TEMPERATURE (° C) Figure 9. Supply Current vs. Temperature 500 400 300 = ...

Page 10

AD5246 0 –6 –12 –18 100kΩ –24 –30 –36 –42 –48 –54 –60 1k 10k 100k FREQUENCY (Hz) Figure 15. –3 dB Bandwidth @ Code = 0x80 0. 5.5V DD CODE = 0x55 0. ...

Page 11

TEST CIRCUITS Figure 21 Figure 25 to define the test conditions used in the product Specification tables. DUT Figure 21. Test Circuit for Resistor Position Nonlinearity Error (Rheostat Operation; R-INL, R-DNL DUT ...

Page 12

AD5246 INTERFACE Table 6. Write Mode Slave Address Byte Table 7. Read Mode Slave Address Byte S = Start Condition Stop Condition. A ...

Page 13

OPERATION The AD5246 is a 128-position, digitally controlled variable resistor (VR) device. PROGRAMMING THE VARIABLE RESISTOR Rheostat Operation The nominal resistance of the RDAC between Terminal A and Terminal B is available in 5 kΩ, 10 kΩ, 50 kΩ, and ...

Page 14

AD5246 A repeated write function gives the user flexibility to update the RDAC output a number of times after addressing the part only once. For example, after the RDAC has acknowledged its slave address in write mode, the RDAC output ...

Page 15

... EVALUATION BOARD An evaluation board, along with all necessary software, is available to program the AD5246 from any PC running Windows® 98, Windows 2000, or Windows XP®. The graphical user interface, as shown in Figure 36, is straightforward and easy to use ...

Page 16

... AD5246BKSZ50-RL7 50 1 AD5246BKSZ100-R2 100 1 AD5246BKSZ100-RL7 100 EVAL-AD5246EBZ RoHS Compliant Part. 2 The evaluation board is shipped with the 10 kΩ R Purchase of licensed components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I 2 Rights to use these components system, provided that the system conforms to the I © ...

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