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AD5174 Datasheet

Digital Rheostat With SPI Interface And 50-TP Memory

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Single-Channel, 1024-Position, Digital Rheostat
with SPI Interface and 50-TP Memory
AD5174
FEATURES
Single-channel, 1024-position resolution
10 kΩ nominal resistance
50-times programmable (50-TP) wiper memory
Rheostat mode temperature coefficient: 35 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
SPI-compatible interface
Wiper setting and memory readback
Power on refreshed from memory
Resistor tolerance stored in 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
GENERAL DESCRIPTION
The AD5174 is a single-channel, 1024-position digital rheostat
that combines industry leading variable resistor performance
with nonvolatile memory (NVM) in a compact package.
This device supports both dual-supply operation at ±2.5 V to
±2.75 V and single-supply operation at 2.7 V to 5.5 V and offers
50-times programmable (50-TP) memory.
FUNCTIONAL BLOCK DIAGRAM
VDD
POWER-ON
RESET
AD5174
SCLK
SYNC
DIN
SDO
SPI
SERIAL
INTERFACE
RDAC
REGISTER
10
50-TP
MEMORY
BLOCK
A
W
VSS EXT_CAP
Figure 1.
GND
The AD5174 device wiper settings are controllable through the
SPI digital interface. Unlimited adjustments are allowed before
programming the resistance value into the 50-TP memory. The
AD5174 does not require any external voltage supply to facili-
tate fuse blow and there are 50 opportunities for permanent
programming. During 50-TP activation, a permanent blow fuse
command freezes the resistance position (analogous to placing
epoxy on a mechanical rheostat).
The AD5174 is available in a 3 mm × 3mm 10-lead LFCSP
package and in a 10-lead MSOP package. The part is guaranteed
to operate over the extended industrial temperature range of
−40°C to +125°C.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2010 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD5174 Datasheet

Digital Rheostat With SPI Interface And 50-TP Memory

No Preview Available !

AD5174
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics............................................................. 3
Interface Timing Specifications.................................................. 4
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Test Circuits..................................................................................... 11
Theory of Operation ...................................................................... 12
Serial Data Interface................................................................... 12
REVISION HISTORY
3/10—Revision 0: Initial Version
www.DataSheet4U.com
Shift Register ............................................................................... 12
RDAC Register............................................................................ 12
50-TP Memory Block ................................................................ 12
Write Protection ......................................................................... 12
RDAC and 50-TP Read Operation .......................................... 13
Shutdown Mode ......................................................................... 14
Reset ............................................................................................. 14
Daisy-Chain Operation ............................................................. 15
RDAC Architecture.................................................................... 15
Programming the Variable Resistor......................................... 16
EXT_CAP Capacitor.................................................................. 17
Terminal Voltage Operating Range ......................................... 17
Power-Up Sequence ................................................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
Rev. 0 | Page 2 of 20



Part Number AD5174
Description Digital Rheostat With SPI Interface And 50-TP Memory
Maker Analog Devices
Total Page 20 Pages
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AD5174 Datasheet PDF





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