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AD5271 반도체 회로 부품 판매점

(AD5270 / AD5271) SPI Interface and 50-TP Memory Digital Rheostat



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Analog Devices
AD5271 데이터시트, 핀배열, 회로
Data Sheet
1024-/256-Position, 1% Resistor Tolerance Error,
SPI Interface and 50-TP Memory Digital Rheostat
AD5270/AD5271
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
SPI-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
GENERAL DESCRIPTION
The AD5270/AD52711 are single-channel, 1024-/256-position
digital rheostats that combine industry leading variable resistor
performance with nonvolatile memory (NVM) in a compact
package.
The AD5270/AD5271 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.
FUNCTIONAL BLOCK DIAGRAM
VDD
POWER-ON
RESET
AD5270/AD5271
SCLK
SYNC
DIN
SDO
SERIAL
INTERFACE
10/8
RDAC
REGISTER
50-TP
MEMORY
BLOCK
A
W
VSS EXT_CAP
Figure 1.
GND
The AD5270/AD5271 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 AD5270/AD5271 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 resistance
position (analogous to placing epoxy on a mechanical trimmer).
The AD5270/AD5271 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. F
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
www.analog.com
Free Datasheet http://www.datasheet4u.com/


AD5271 데이터시트, 핀배열, 회로
AD5270/AD5271
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics—AD5270 .......................................... 3
Electrical Characteristics—AD5271 .......................................... 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. E to Rev. F
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 ....................................................... 23
12/10—Rev. D to Rev. E
Changes to SDO Pin Description................................................. 10
Changes to SDO Pin and Daisy-Chain Operation Section....... 21
11/10—Rev. C to Rev. D
Changes to Figure 25...................................................................... 14
9/10—Rev. B to Rev. C
Changes to Figure 3 Caption........................................................... 7
Changes to Figure 4 Caption........................................................... 8
Deleted Daisy-Chain Operation Section, Added SDO Pin and
Daisy-Chain Operation Section ................................................... 21
5/10—Rev. A to Rev. B
Data Sheet
Shift Register ............................................................................... 18
RDAC Register............................................................................ 18
50-TP Memory Block ................................................................ 18
Write Protection ......................................................................... 18
RDAC and 50-TP Read Operation .......................................... 19
Shut-Down Mode....................................................................... 20
Resistor Performance Mode...................................................... 20
Reset ............................................................................................. 20
SDO Pin and Daisy-Chain Operation..................................... 21
RDAC Architecture.................................................................... 21
Programming the Variable Resistor......................................... 22
EXT_CAP Capacitor.................................................................. 22
Terminal Voltage Operating Range ......................................... 22
Power-Up Sequence ................................................................... 22
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 24
Added LFCSP Throughout ..............................................................1
Changed OTP to 50-TP Throughout..............................................1
Changes to Product Title, Features, and General Description....1
Changes to Table 1.............................................................................3
Added Table 3; Renumbered Sequentially .....................................4
Changes to Table 4.............................................................................5
Added Table 6 ....................................................................................6
Changes to Table 8 and Table 9........................................................9
Added Figure 6 and changes to Table 10..................................... 10
Replaced Typical Performance Characteristics Section ............ 11
Changes to Figure 44...................................................................... 21
Updated Outline Dimensions....................................................... 23
Changes to Ordering Guide .......................................................... 24
3/10—Rev. 0 to Rev. A
Changes to Product Title and General Description.....................1
Changes to Theory of Operation Section...................................14
10/09—Revision 0: Initial Version
Rev. F | Page 2 of 24
Free Datasheet http://www.datasheet4u.com/




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