EVAL-AD5272SDZ

Manufacturer Part NumberEVAL-AD5272SDZ
DescriptionEVALUATION BOARD
ManufacturerAnalog Devices Inc
EVAL-AD5272SDZ datasheet
 


Specifications of EVAL-AD5272SDZ

Main PurposeDigital PotentiometerEmbeddedNo
Utilized Ic / PartAD5272Primary Attributes1 Channel, 1024 Position
Secondary Attributes2.7 ~ 5.5 V, 5 ppm/°C, I²CLead 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
2
I
C-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 AD5272/AD5274
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.
1
Protected by U.S. Patent Number 7688240; others patents pending
Rev. C
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,
2
I
C Interface and 50-TP Memory Digital Rheostat
FUNCTIONAL BLOCK DIAGRAM
POWER-ON
SCL
SERIAL
SDA
INTERFACE
ADDR
RESET
The AD5272/AD5274 device wiper settings are controllable
2
through the I
C-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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
AD5272/AD5274
V
DD
RESET
AD5272/AD5274
RDAC
REGISTER
2
10/8
I
C
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-AD5272SDZ 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

    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 ...

  • Page 3

    SPECIFICATIONS ELECTRICAL CHARACTERISTICS—AD5272 Table 1. Parameter DC CHARACTERISTICS—RHEOSTAT MODE Resolution 2, 3 Resistor Integral Nonlinearity 2 Resistor Differential ...

  • Page 4

    AD5272/AD5274 Parameter 5 Power Supply Rejection Ratio 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 ...

  • Page 5

    ELECTRICAL CHARACTERISTICS—AD5274 Table 4. Parameter Symbol DC CHARACTERISTICS— RHEOSTAT MODE Resolution 2, 3 Resistor Integral Nonlinearity R-INL Resistor ...

  • Page 6

    AD5272/AD5274 Parameter Symbol 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 ...

  • Page 7

    INTERFACE TIMING SPECIFICATIONS 5.5 V; all specifications T DD Table 7. 1 Parameter Conditions 2 f Standard mode SCL Fast mode t Standard mode 1 Fast mode t Standard mode 2 Fast mode t Standard ...

  • Page 8

    AD5272/AD5274 Shift Register and Timing Diagrams CONTROL BITS SCL t 6 SDA RESET DB9 (MSB Figure 2. Shift Register Content ...

  • 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

    AD5272/AD5274 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS AD5272 AD5274 W 3 TOP VIEW (Not to Scale) EXT_CAP 5 Figure 4. MSOP Pin Configuration Table 10. Pin Function Descriptions Pin No. Mnemonic Description 1 ...

  • 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 6. R-INL in R-Perf Mode vs. Code vs. Temperature (AD5272) 0.2 0.1 0 –0.1 –0.2 –0.3 –0.4 –0.5 ...

  • Page 12

    AD5272/AD5274 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 12. R-DNL in Normal Mode vs. Code vs. Temperature (AD5272) 0.20 +125°C +25°C –40°C 0.15 0.10 0.05 0 –0.05 –0.10 ...

  • Page 13

    CODE (Decimal) Figure 18. R-INL in Normal Mode vs. Code vs. Temperature (AD5274) 0. 20kΩ AW 0.02 0.01 0 –0.01 –0.02 –0. 128 ...

  • Page 14

    AD5272/AD5274 256 512 0 64 128 CODE (Decimal) Figure 24. 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 IN –20 –40 –60 –80 –100 100 1k 10k FREQUENCY (Hz) Figure 30. THD + N vs. Frequency 0.03 0.02 0.01 ...

  • Page 16

    AD5272/AD5274 0.07 0.09 0.11 0.13 TIME (Seconds) Figure 36. 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 37. Long-Term Drift Accelerated Average by Burn-In ...

  • Page 17

    TEST CIRCUITS Figure 38 to Figure 42 define the test conditions used in the Specifications section. DUT Figure 38. Resistor Position Nonlinearity Error (Rheostat Operation; R-INL, R-DNL CODE = 0x00 DUT I ...

  • Page 18

    AD5272/AD5274 THEORY OF OPERATION The AD5272 and AD5274 digital rheostats are designed to operate as true variable resistors for analog signals within the terminal voltage range of V < V < TERM contents determine the resistor wiper position. ...

  • Page 19

    WRITE OPERATION It is possible to write data for the RDAC register or the control register. When writing to the AD5272/AD5274, the user must begin with a start command followed by an address byte ( 0), after which ...

  • Page 20

    AD5272/AD5274 READ OPERATION When reading data back from the AD5272/AD5274, the user must first issue a readback command to the device, this begins with a start command followed by an address byte ( 0), after which the AD5272/AD5274 ...

  • Page 21

    RDAC REGISTER The RDAC register directly controls the position of the digital rheostat wiper. For example, when the RDAC register is loaded with all zeros, the wiper is connected to Terminal A of the variable resistor possible to ...

  • Page 22

    Table 13. Write and Read to RDAC and 50-TP memory DIN SDO 1 Action 0x1C03 0xXXXX Enable update of wiper position and 50-TP memory contents through digital interface. 0x0500 0x1C03 Write 0x100 to the RDAC register, wiper moves to ¼ ...

  • Page 23

    MEMORY WRITE-ACKNOWLEDGE POLLING After each write operation to the 50-TP registers, an internal 2 write cycle begins. The I C interface of the device is disabled. To determine if the internal write cycle is complete and the 2 I ...

  • Page 24

    AD5272/AD5274 EXT_CAP CAPACITOR A 1 μF capacitor to V must be connected to the EXT_CAP pin SS (see Figure 47) on power-up and throughout the operation of the AD5272/AD5274. AD5272/ AD5274 50_OTP MEMORY EXT_CAP BLOCK C1 1µ ...

  • Page 25

    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 26

    ... AD5272BCPZ-100-RL7 100 AD5274BRMZ-20 20 AD5274BRMZ-20-RL7 20 AD5274BRMZ-100 100 AD5274BRMZ-100-RL7 100 AD5274BCPZ-20-RL7 20 AD5274BCPZ-100-RL7 100 EVAL-AD5272SDZ RoHS Compliant Part. Resolution Temperature Range 1,024 −40°C to +125°C 1,024 −40°C to +125°C 1,024 −40°C to +125°C 1,024 −40°C to +125°C 1,024 −40°C to +125°C 1,024 − ...

  • Page 27

    NOTES Rev Page AD5272/AD5274 ...

  • Page 28

    AD5272/AD5274 NOTES refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors). ©2009–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D08076-0-11/10(C) Rev ...