AD5231BRU10

Manufacturer Part NumberAD5231BRU10
DescriptionIC DGTL POT 1024POS 16-TSSOP
ManufacturerAnalog Devices Inc
AD5231BRU10 datasheet
 

Specifications of AD5231BRU10

Rohs StatusRoHS non-compliantTaps1024
Resistance (ohms)10KNumber Of Circuits1
Temperature Coefficient600 ppm/°C TypicalMemory TypeNon-Volatile
Interface4-Wire SPI SerialVoltage - Supply2.7 V ~ 5.5 V, ±2.25 V ~ 2.75 V
Operating Temperature-40°C ~ 85°CMounting TypeSurface Mount
Package / Case16-TSSOPResistance In Ohms10K
End To End Resistance10kohmTrack TaperLogarithmic
Resistance Tolerance+20, -40%No. Of Steps1024
Supply Voltage Range2.7V To 5.5V, ± 2.25V To ± 2.75VControl InterfaceSerial, SPI
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FEATURES
1024-position resolution
Nonvolatile memory maintains wiper setting
Power-on refresh with EEMEM setting
EEMEM restore time: 140 μs typ
Full monotonic operation
10 kΩ, 50 kΩ, and 100 kΩ terminal resistance
Permanent memory write protection
Wiper setting readback
Predefined linear increment/decrement instructions
Predefined ±6 dB/step log taper increment/decrement
instructions
SPI®-compatible serial interface
3 V to 5 V single-supply or ±2.5 V dual-supply operation
28 bytes extra nonvolatile memory for user-defined data
100-year typical data retention, T
= 55°C
A
APPLICATIONS
Mechanical potentiometer replacement
Instrumentation: gain, offset adjustment
Programmable voltage to current conversion
Programmable filters, delays, time constants
Programmable power supply
Low resolution DAC replacement
Sensor calibration
GENERAL DESCRIPTION
1
The AD5231 is a nonvolatile memory
, digitally controlled
2
potentiometer
with 1024-step resolution. The device performs
the same electronic adjustment function as a mechanical
potentiometer with enhanced resolution, solid state reliability,
and remote controllability. The AD5231 has versatile programming
that uses a standard 3-wire serial interface for 16 modes of
operation and adjustment, including scratchpad programming,
memory storing and restoring, increment/decrement, ±6 dB/step
log taper adjustment, wiper setting readback, and extra EEMEM
for user-defined information, such as memory data for other
components, look-up table, or system identification information.
In scratchpad programming mode, a specific setting can be
programmed directly to the RDAC register that sets the
1
The terms nonvolatile memory and EEMEM are used interchangeably.
2
The terms digital potentiometer and RDAC are used interchangeably.
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.
Nonvolatile Memory,
1024-Position Digital Potentiometer
FUNCTIONAL BLOCK DIAGRAM
CS
ADDR
CLK
DECODE
SDI
SDI
SERIAL
GND
INTERFACE
SDO
SDO
WP
EEMEM
CONTROL
RDY
28 BYTES
USER EEMEM
PR
100
R
WA
75
50
25
0
0
256
Figure 2. R
(D) and R
WA
resistance between Terminals W–A and Terminals W–B. This
setting can be stored into the EEMEM and is transferred
automatically to the RDAC register during system power-on.
The EEMEM content can be restored dynamically or through
external PR strobing, and a WP function protects EEMEM
contents. To simplify the programming, the linear-step increment
or decrement commands can be used to move the RDAC wiper
up or down, one step at a time. The ±6 dB step commands can
be used to double or half the RDAC wiper setting.
The AD5231 is available in a 16-lead TSSOP. The part is
guaranteed to operate over the extended industrial temperature
range of −40°C to +85°C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
AD5231
AD5231
V
DD
RDAC
RDAC
REGISTER
A
W
EEMEM(0)
B
DIGITAL
O1
REGISTER
DIGITAL
2
O2
OUTOUT
BUFFER
EEMEM(1)
V
SS
Figure 1.
R
WB
512
768
1023
CODE (Decimal)
(D) vs. Decimal Code
WB
www.analog.com

AD5231BRU10 Summary of contents

  • Page 1

    FEATURES 1024-position resolution Nonvolatile memory maintains wiper setting Power-on refresh with EEMEM setting EEMEM restore time: 140 μs typ Full monotonic operation 10 kΩ, 50 kΩ, and 100 kΩ terminal resistance Permanent memory write protection Wiper setting readback Predefined linear ...

  • Page 2

    AD5231 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Characteristics—10 kΩ, 50 kΩ, 100 kΩ Versions .. 3 Timing Characteristics—10 kΩ, 50 kΩ, 100 ...

  • Page 3

    SPECIFICATIONS ELECTRICAL CHARACTERISTICS—10 kΩ, 50 kΩ, 100 kΩ VERSIONS ± 10 ± 10 Table 1. Parameter DC CHARACTERISTICS— RHEOSTAT MODE 2 Resistor Differential Nonlinearity 2 Resistor ...

  • Page 4

    AD5231 Parameter POWER SUPPLIES Single-Supply Power Range Dual-Supply Power Range Positive Supply Current Negative Supply Current EEMEM Store Mode Current EEMEM Restore Mode Current 7 8 Power Dissipation 5 Power Supply Sensitivity 5, 9 DYNAMIC CHARACTERISTICS Bandwidth Total Harmonic Distortion ...

  • Page 5

    TIMING CHARACTERISTICS—10 kΩ, 50 kΩ, 100 kΩ VERSIONS 5 and −40°C < Table 2. Parameter 2, 3 INTERFACE TIMING CHARACTERISTICS Clock Cycle Time (t ) CYC CS ...

  • Page 6

    AD5231 Timing Diagrams CLK CPOL = 1 HIGH OR LOW SDI t 8 SDO B24 RDY * NOT DEFINED, BUT NORMALLY LSB OF CHARACTER PREVIOUSLY TRANSMITTED. THE CPOL = 1 MICROCONTROLLER COMMAND ALIGNS THE INCOMING ...

  • Page 7

    ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameters V to GND GND GND A–B, A–W, B–W 1 ...

  • Page 8

    AD5231 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 O1 Nonvolatile Digital Output 1. ADDR = 0x1, data bit position D0. For example, to store O1 high, the data bit format is 0x310001. ...

  • Page 9

    TYPICAL PERFORMANCE CHARACTERISTICS 1 +85°C A 1.0 0 –40°C A –0.5 –1.0 0 128 256 384 512 640 CODE (Decimal) Figure 6. INL vs. Code −40°C, +25°C, +85°C Overlay ...

  • Page 10

    AD5231 2.7V 25° 128 256 384 512 640 CODE (Decimal) Figure 12. Wiper On Resistance vs. Code ...

  • Page 11

    CODE = 0x200 –10 0x100 0x80 –20 0x40 0x20 –30 0x10 0x08 –40 0x04 0x02 –50 0x01 –60 1k 10k 100k FREQUENCY (Hz) Figure 18. Gain vs. Frequency vs. Code kΩ (Figure 32 CODE ...

  • Page 12

    AD5231 CS CLK SDI 2mA/DIV 4ms/DIV *SUPPLY CURRENT RETURNS TO MINIMUM POWER CONSUMPTION IF INSTRUCTION 0 (NOP) IS EXECUTED IMMEDIATELY AFTER INSTRUCTION 1 (READ EEMEM). Figure 24. I vs. Time when Restoring Data from EEMEM DD 100 ...

  • Page 13

    TEST CIRCUITS Figure 26 to Figure 35 define the test conditions used in the specifications. NC DUT CONNECT Figure 26. Resistor Position Nonlinearity Error (Rheostat Operation; R-INL, R-DNL) DUT V+ ...

  • Page 14

    AD5231 THEORY OF OPERATION The AD5231 digital potentiometer is designed to operate as a true variable resistor replacement device for analog signals that remain within the terminal voltage range of V The basic voltage range is limited ...

  • Page 15

    DIGITAL INPUT/OUTPUT CONFIGURATION All digital inputs are ESD-protected, high input impedance that can be driven directly from most digital sources. Active at logic low, PR and WP must be tied they are not used internal ...

  • Page 16

    AD5231 TERMINAL VOLTAGE OPERATION RANGE The AD5231’s positive V and negative V DD define the boundary conditions for proper 3-terminal digital potentiometer operation. Supply signals present on the A, B, and W terminals that exceed ...

  • Page 17

    In Table 6, command bits are C0 to C3, address bits are A3 to A0, Data Bit D0 to Data Bit D9 are applicable to RDAC, and D0 to D15 are applicable to EEMEM. Table 6. AD5231 24-Bit Serial Data-Word ...

  • Page 18

    AD5231 ADVANCED CONTROL MODES The AD5231 digital potentiometer includes a set of user programming features to address the wide number of applications for these universal adjustment devices. Key programming features include: • Scratchpad programming to any desirable values • Nonvolatile ...

  • Page 19

    Using Additional Internal Nonvolatile EEMEM The AD5231 contains additional user EEMEM registers for storing any 16-bit data such as memory data for other compo- nents, look-up tables, or system identification information. Table 9 provides an address map of the internal ...

  • Page 20

    AD5231 100 256 512 CODE (Decimal) Figure 44. R (D) and R (D) vs. Decimal Code WA WB The general equation that determines the programmed output resistance between W and ...

  • Page 21

    PROGRAMMING EXAMPLES The following programming examples illustrate a typical sequence of events for various features of the AD5231. See Table 7 for the instructions and data-word format. The instruction numbers, addresses, and data appearing at SDI and SDO pins are ...

  • Page 22

    AD5231 FLASH/EEMEM RELIABILITY The Flash/EE memory array on the AD5231 is fully qualified for two key Flash/EE memory characteristics, namely Flash/EE memory cycling endurance and Flash/EE memory data retention. Endurance quantifies the ability of the Flash/EE memory to be cycled ...

  • Page 23

    APPLICATIONS BIPOLAR OPERATION FROM DUAL SUPPLIES The AD5231 can be operated from dual supplies ±2.5 V, which enables control of ground referenced ac signals or bipolar operation. AC signals as high across Terminal A to ...

  • Page 24

    AD5231 U1 AD5231 W + OUT +5V +2.5VREF –2.5VREF TRIM GND V+ AD8552 ADR421 V– A1 –5V Figure 49. 10-Bit Bipolar DAC 10-BIT UNIPOLAR DAC Figure 50 shows a unipolar 10-bit DAC using ...

  • Page 25

    PROGRAMMABLE BIDIRECTIONAL CURRENT SOURCE For applications that require bidirectional current control or higher voltage compliance, a Howland current pump can be a solution. If the resistors are matched, the load current R2A R2B R1 = × ...

  • Page 26

    ... RDAC CIRCUIT SIMULATION MODEL The internal parasitic capacitances and the external load dominates the ac characteristics of the RDACs. The −3 dB bandwidth of the AD5231BRU10 (10 kΩ resistor) measures 370 kHz at half scale when configured as a potentiometer divider. Figure 15 provides the large signal BODE plot charac- teristics ...

  • Page 27

    ... ORDERING GUIDE Model R (kΩ) AB AD5231BRU10 10 AD5231BRU10-REEL7 10 1 AD5231BRUZ10 10 1 AD5231BRUZ10-REEL7 10 AD5231BRU50 50 AD5231BRU50-REEL7 50 1 AD5231BRUZ50 50 1 AD5231BRUZ50-REEL7 50 AD5231BRU100 100 AD5231BRU100-RL7 100 AD5231BRUZ100 1 100 1 AD5231BRUZ100-RL7 100 Pb-free part. 5.10 5.00 4. 4.50 6.40 4.40 BSC 4. PIN 1 1.20 MAX 0.20 0.09 8° 0.30 0.65 0° ...

  • Page 28

    AD5231 NOTES Purchase of licensed components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I Rights to use these components system, ...