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AD5274 Datasheet

(AD5272 / AD5274) I2C Interface and 50-TP Memory Digital Rheostat

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AD5274 pdf
Data Sheet
1024-/256-Position, 1% Resistor Tolerance Error,
I2C Interface and 50-TP Memory Digital Rheostat
AD5272/AD5274
FEATURES
Single-channel, 1024-/256-position resolution
20 kΩ, 50 kΩ, 100 kΩ nominal resistance
Maximum ±1% nominal resistor tolerance error
50-times programmable (50-TP) wiper memory
Rheostat mode temperature coefficient: 5 ppm/°C
2.7 V to 5.5 V single-supply operation
±2.5 V to ±2.75 V dual-supply operation for ac or bipolar
operations
I2C-compatible interface
Wiper setting readback
Power on refreshed from 50-TP memory
Thin LFCSP 10-lead, 3 mm × 3 mm × 0.8 mm package
Compact MSOP, 10-lead 3 mm × 4.9 mm × 1.1 mm package
APPLICATIONS
Mechanical rheostat replacements
Op-amp: variable gain control
Instrumentation: gain, offset adjustment
Programmable voltage to current conversions
Programmable filters, delays, time constants
Programmable power supply
Sensor calibration
FUNCTIONAL BLOCK DIAGRAM
VDD
POWER-ON
RESET
AD5272/AD5274
SCL
SDA
ADDR
RESET
I2C
SERIAL
INTERFACE
RDAC
REGISTER
10/8
50-TP
MEMORY
BLOCK
A
W
VSS EXT_CAP
Figure 1.
GND
GENERAL DESCRIPTION
The AD5272/AD52741 are single-channel, 1024-/256-position
digital rheostats that combine industry leading variable resistor
performance with nonvolatile memory (NVM) in a compact
package.
The AD5272/AD5274 ensure less than 1% end-to-end resistor
tolerance error and offer 50-times programmable (50-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 AD5272/AD5274 device wiper settings are controllable
through the I2C-compatible digital interface. Unlimited
adjustments are allowed before programming the resistance
value into the 50-TP memory. The AD5272/AD5274 do not
require any external voltage supply to facilitate fuse blow and
there are 50 opportunities for permanent programming. During
50-TP activation, a permanent blow fuse command freezes the
wiper position (analogous to placing epoxy on a mechanical
trimmer).
The AD5272/AD5274 are available in a 3 mm × 3 mm 10-lead
LFCSP package and in a 10-lead MSOP package. The parts are
guaranteed to operate over the extended industrial temperature
range of −40°C to +125°C.
1 Protected by U.S. Patent Number 7688240.
Rev. D
Document Feedback
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2009–2013 Analog Devices, Inc. All rights reserved.
Technical Support
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Analog Devices Semiconductor Electronic Components Datasheet

AD5274 Datasheet

(AD5272 / AD5274) I2C Interface and 50-TP Memory Digital Rheostat

No Preview Available !

AD5274 pdf
AD5272/AD5274
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics—AD5272 .......................................... 3
Electrical Characteristics—AD5274 .......................................... 5
Interface Timing Specifications.................................................. 7
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
REVISION HISTORY
3/13—Rev. C to Rev. D
Changed Resistor Noise Density, RAW = 20 kΩ from 50 nV/√Hz
to 13 nV/√Hz; Table 1 ...................................................................... 4
Changed Resistor Noise Density, RAW = 20 kΩ from 50 nV/√Hz
to 13 nV/√Hz; Table 4 ...................................................................... 6
Updated Outline Dimensions ....................................................... 25
11/10—Rev. B to Rev. C
Changes to Figure 24...................................................................... 14
5/10—Rev. A to Rev. B
Added LFCSP Package.................................................. Throughout
Changed OTP to 50-TP ................................................ Throughout
Changes to Features Section and Applications Section............... 1
Added Endnote 1.............................................................................. 1
Changes to Table 1............................................................................ 3
Added Table 3.................................................................................... 4
Changes to Table 4............................................................................ 5
Added Table 6.................................................................................... 6
Changes to Table 8 and Table 9....................................................... 9
Added Figure 5................................................................................ 10
Added Exposed Pad Note to Table 10.......................................... 10
Changes to Typical Performance Characteristics....................... 11
Changes to Resistor Performance Mode Section ....................... 23
Updated Outline Dimensions ....................................................... 25
Changes to Ordering Guide .......................................................... 26
Data Sheet
Shift Register ............................................................................... 18
Write Operation.......................................................................... 19
Read Operation........................................................................... 20
RDAC Register............................................................................ 21
50-TP Memory Block ................................................................ 21
Write Protection ......................................................................... 21
50-TP Memory Write-Acknowledge Polling.......................... 23
Reset ............................................................................................. 23
Resistor Performance Mode...................................................... 23
Shutdown Mode ......................................................................... 23
RDAC Architecture.................................................................... 23
Programming the Variable Resistor......................................... 23
EXT_CAP Capacitor.................................................................. 24
Terminal Voltage Operating Range ......................................... 24
Power-Up Sequence ................................................................... 24
Outline Dimensions ....................................................................... 25
Ordering Guide .......................................................................... 25
3/10—Rev. 0 to Rev. A
Changes to Product Title and General Description Section .......1
Changes to Theory of Operation Section.................................... 15
10/09—Revision 0: Initial Version
Rev. D | Page 2 of 28
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Part Number AD5274
Description (AD5272 / AD5274) I2C Interface and 50-TP Memory Digital Rheostat
Maker Analog Devices
Total Page 28 Pages
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