EVAL-AD5270SDZ

Manufacturer Part NumberEVAL-AD5270SDZ
DescriptionEVALUATION BOARD
ManufacturerAnalog Devices Inc
EVAL-AD5270SDZ datasheet
 

Specifications of EVAL-AD5270SDZ

Main PurposeDigital PotentiometerEmbeddedNo
Utilized Ic / PartAD5270Primary Attributes1 Channel, 1024 Position
Secondary Attributes2.7 ~ 5.5 V, 5 ppm/°C, SPI InterfacesLead Free Status / RoHS StatusLead free / RoHS Compliant
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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
1
The AD5270/AD5271
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.
1
Protected by U.S.Patent Number 7688240; others patents pending.
Rev. E
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.
1024-/256-Position, 1% Resistor Tolerance Error,
SPI Interface and 50-TP Memory Digital Rheostat
FUNCTIONAL BLOCK DIAGRAM
SCLK
SYNC
DIN
SDO
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
AD5270/AD5271
V
DD
POWER-ON
RESET
AD5270/AD5271
RDAC
REGISTER
10/8
SERIAL
INTERFACE
50-TP
MEMORY
BLOCK
V
EXT_CAP
GND
SS
Figure 1.
www.analog.com
©2009–2010 Analog Devices, Inc. All rights reserved.
A
W

EVAL-AD5270SDZ Summary of contents

  • Page 1

    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 5.5 V single-supply operation ±2 ±2.75 ...

  • Page 2

    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 ...

  • Page 3

    SPECIFICATIONS ELECTRICAL CHARACTERISTICS—AD5270 Table 1. Parameter DC CHARACTERISTICS—RHEOSTAT MODE Resolution Resistor Integral Nonlinearity 2 Resistor ...

  • Page 4

    AD5270/AD5271 Parameter 10 Power Dissipation 5 Power Supply Rejection Ratio DYNAMIC CHARACTERISTICS Bandwidth Total Harmonic Distortion Resistor Noise Density 1 Typical specifications represent average readings at 25° Resistor position nonlinearity error (R-INL) is the deviation ...

  • Page 5

    ELECTRICAL CHARACTERISTICS—AD5271 Table 4. Parameter DC CHARACTERISTICS—RHEOSTAT MODE Resolution 2, 3 Resistor Integral Nonlinearity 2 Resistor Differential Nonlinearity ...

  • Page 6

    AD5270/AD5271 Parameter 5, 11 DYNAMIC CHARACTERISTICS Bandwidth Total Harmonic Distortion Resistor Noise Density 1 Typical specifications represent average readings at 25° Resistor position nonlinearity error (R-INL) is the deviation from an ideal value measured between the maximum resistance ...

  • Page 7

    INTERFACE TIMING SPECIFICATIONS Table 7. 1 Parameter Limit Unit min min 2 t ...

  • Page 8

    AD5270/AD5271 SCLK SYNC DIN SDO Figure 4. Read Timing Diagram (CPOL = 0, CPHA = 1) Rev Page ...

  • Page 9

    ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 8. Parameter V to GND GND GND A W Digital Input and Output Voltage to GND ...

  • Page 10

    AD5270/AD5271 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS AD5270 AD5271 TOP VIEW (Not to Scale) EXT_CAP 5 6 Figure 5. MSOP Pin Configuration Table ...

  • Page 11

    TYPICAL PERFORMANCE CHARACTERISTICS 0.8 +125°C +25°C –40°C 0.6 0.4 0.2 0 –0.2 –0.4 0 128 256 384 512 640 CODE (Decimal) Figure 7. R-INL in R-Perf Mode vs. Code vs. Temperature (AD5270) 0.2 0.1 0 –0.1 –0.2 –0.3 –0.4 –0.5 ...

  • Page 12

    AD5270/AD5271 0.15 +125°C +25°C –40°C 0.10 0.05 0 –0.05 –0.10 –0.15 0 128 256 384 512 640 CODE (Decimal) Figure 13. R-DNL in Normal Mode vs. Code vs. Temperature (AD5270) 0.20 +125°C +25°C –40°C 0.15 0.10 0.05 0 –0.05 –0.10 ...

  • Page 13

    CODE (Decimal) Figure 19. R-INL in Normal Mode vs. Code vs. Temperature (AD5271) 0. 20kΩ AW 0.02 0.01 0 –0.01 –0.02 –0. 128 ...

  • Page 14

    AD5270/AD5271 256 512 0 64 128 CODE (Decimal) Figure 25. Tempco ΔR /ΔT vs. Code WA 0 0x200 (0x80) –10 0x100 (0x40) 0x080 (0x20) –20 0x040 (0x10) 0x020 ...

  • Page 15

    5V/ CODE = HALF SCALE NOISE BW = 22kHz rms –20 IN –40 –60 –80 –100 100 1k 10k FREQUENCY (Hz) Figure 31. THD + N vs. Frequency 0.03 0.02 0.01 ...

  • Page 16

    AD5270/AD5271 0.07 0.09 0.11 0.13 TIME (Seconds) Figure 37. V Waveform While Writing Fuse EXT_CAP 0.006 0.005 0.004 0.003 0.002 0.001 0 –0.001 –0.002 0 0.15 0.17 Figure 38. Long-Term Drift Accelerated Average by Burn-In ...

  • Page 17

    TEST CIRCUITS Figure 39 to Figure 43 define the test conditions used in the Specifications section. DUT Figure 39. Resistor Position Nonlinearity Error (Rheostat Operation; R-INL, R-DNL) R CODE = 0x00 DUT I W ...

  • Page 18

    AD5270/AD5271 THEORY OF OPERATION The AD5270 and AD5271 are designed to operate as true variable resistors for analog signals within the terminal voltage range of V < V < The RDAC register contents deter- SS TERM DD mine ...

  • Page 19

    RDAC AND 50-TP READ OPERATION A serial data output SDO pin is available for readback of the internal RDAC register or 50-TP memory contents. The contents of the RDAC register can be read back through SDO by using Command 2 ...

  • Page 20

    AD5270/AD5271 SHUT-DOWN MODE The AD5270/AD5271 can be shut down by executing the software shutdown command, Command 9 (see Table 11), and setting the LSB to 1. This feature places the RDAC in a zero- power-consumption state where Terminal Ax is ...

  • Page 21

    Table 15. Memory Map Command Number … … don’t care. SDO PIN AND DAISY-CHAIN ...

  • Page 22

    AD5270/AD5271 PROGRAMMING THE VARIABLE RESISTOR Rheostat Operation—1% Resistor Tolerance The nominal resistance between Terminal W and Terminal kΩ, 50 kΩ, or 100 kΩ and has 1024-/256-tap points accessed by the wiper terminal. The 10-/8-bit data in ...

  • Page 23

    OUTLINE DIMENSIONS IDENTIFIER PIN 1 INDEX AREA 0.80 0.75 0.70 SEATING PLANE 3.10 3.00 2.90 5. 3.10 4.90 3.00 4.65 1 2.90 5 PIN 1 0.50 BSC 0.95 15° MAX 0.85 1.10 MAX 0.75 0.15 0.23 6° 0.30 ...

  • Page 24

    ... AD5271BRMZ-20-RL7 20 AD5271BRMZ-100 100 AD5271BRMZ-100-RL7 100 AD5271BCPZ-20-RL7 20 AD5271BCPZ-100-RL7 100 EVAL-AD5270SDZ RoHS Compliant Part. ©2009–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Resolution Temperature Range 1,024 −40°C to +125°C 1,024 −40°C to +125°C 1,024 − ...