AD5232BRUZ100-RL7

Manufacturer Part NumberAD5232BRUZ100-RL7
DescriptionDual 8-Bit EEMEM Dig POT
ManufacturerAnalog Devices Inc
AD5232BRUZ100-RL7 datasheet
 

Specifications of AD5232BRUZ100-RL7

Taps256Resistance (ohms)100K
Number Of Circuits2Temperature Coefficient600 ppm/°C Typical
Memory TypeNon-VolatileInterface4-Wire SPI Serial
Voltage - Supply2.7 V ~ 5.5 V, ±2.25 V ~ 2.75 VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case16-TSSOP
Resistance In Ohms100KLead Free Status / RoHS StatusLead free / RoHS Compliant
For Use WithEVAL-AD5232-10EBZ - BOARD EVALUATION FOR AD5232-10  
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FEATURES
Dual-channel, 256-position resolution
10 kΩ, 50 kΩ, and 100 kΩ nominal terminal resistance
Nonvolatile memory maintenance of wiper settings
Predefined linear increment/decrement instructions
Predefined ±6 dB step log taper increment/decrement
instructions
SPI-compatible serial interface
Wiper settings and EEMEM readback
3 V to 5 V single-supply operation
±2.5 V dual-supply operation
14 bytes of general-purpose user EEMEM
Permanent memory write protection
100-year typical data retention (T
= 55°C)
A
APPLICATIONS
Mechanical potentiometer replacement
Instrumentation: gain and offset adjustment
Programmable voltage-to-current conversion
Programmable filters, delays, and time constants
Programmable power supply
Low resolution DAC replacement
Sensor calibration
GENERAL DESCRIPTION
The AD5232 device provides a nonvolatile, dual-channel,
digitally controlled variable resistor (VR) with 256-position
resolution. This device performs the same electronic adjustment
function as a mechanical potentiometer with enhanced resolution,
solid state reliability, and superior low temperature coefficient
performance. The versatile programming of the AD5232, per-
ormed via a microcontroller, allows multiple modes of operation
and adjustment.
In the direct program mode, a predetermined setting of the RDAC
registers (RDAC1 and RDAC2) can be loaded directly from the
microcontroller. Another important mode of operation allows
the RDACx register to be refreshed with the setting previously
stored in the corresponding EEMEM register (EEMEM1 and
EEMEM2). When changes are made to the RDACx register to
establish a new wiper position, the value of the setting can be
saved into the EEMEMx register by executing an EEMEM save
operation. After the settings are saved in the EEMEMx register,
these values are automatically transferred to the RDACx register
to set the wiper position at system power-on. Such operation is
enabled by the internal preset strobe. The preset strobe can also
be accessed externally.
Rev. A
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.
Dual 256-Position Digital Potentiometer
FUNCTIONAL BLOCK DIAGRAM
ADDR
CS
DECODE
CLK
SERIAL
SDI
INTERFACE
SDO
POWER-ON
PR
RESET
WP
EEMEM
CONTROL
RDY
All internal register contents can be read via the serial data
output (SDO). This includes the RDAC1 and RDAC2 registers,
the corresponding nonvolatile EEMEM1 and EEMEM2 registers,
and the 14 spare USER EEMEM registers that are available for
constant storage.
The basic mode of adjustment is the increment and decrement
command instructions that control the wiper position setting
register (RDACx). An internal scratch pad RDACx register can
be moved up or down one step of the nominal resistance between
Terminal A and Terminal B. This step adjustment linearly changes
the wiper to Terminal B resistance (R
of the device’s end-to-end resistance (R
logarithmic changes in wiper setting, a left/right shift command
instruction adjusts the levels in ±6 dB steps, which can be useful
for audio and light alarm applications.
The AD5232 is available in a thin, 16-lead TSSOP package.
All parts are guaranteed to operate over the extended industrial
temperature range of −40°C to +85°C. An evaluation board, the
EVAL-AD5232-10EBZ, is available.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Nonvolatile Memory,
AD5232
V
DD
AD5232
RDAC1
REGISTER
A1
W1
B1
EEMEM1
RDAC1
RDAC2
REGISTER
A2
W2
B2
EEMEM2
RDAC2
14 BYTES
USER
EEMEM
GND
V
SS
Figure 1.
) by one position segment
WB
). For exponential/
AB
www.analog.com
©2001–2009 Analog Devices, Inc. All rights reserved.

AD5232BRUZ100-RL7 Summary of contents

  • Page 1

    FEATURES Dual-channel, 256-position resolution 10 kΩ, 50 kΩ, and 100 kΩ nominal terminal resistance Nonvolatile memory maintenance of wiper settings Predefined linear increment/decrement instructions Predefined ±6 dB step log taper increment/decrement instructions SPI-compatible serial interface Wiper settings and EEMEM readback ...

  • Page 2

    AD5232 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 Interface Timing Characteristics ................................................ ...

  • Page 3

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

  • Page 4

    AD5232 Parameter 5, 9 DYNAMIC CHARACTERISTICS Bandwidth Total Harmonic Distortion V Settling Time W Resistor Noise Voltage Crosstalk ( Analog Crosstalk ( FLASH/EE MEMORY RELIABILITY 10 Endurance 11 Data Retention 1 Typical ...

  • Page 5

    INTERFACE TIMING CHARACTERISTICS All input control voltages are specified with t characteristics are measured using both V Table Parameter Clock Cycle Time (t ) CYC CS Setup Time CLK Shutdown Time to CS Rise Input Clock Pulse ...

  • Page 6

    AD5232 Timing Diagrams CLK CPOL = 1 HIGH OR LOW SDI t 8 SDO B16 RDY NOTES 1. B24 IS AN EXTRA BIT THAT IS NOT DEFINED, BUT IT IS USUALLY THE LSB OF THE ...

  • Page 7

    ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter V to GND GND GND − ...

  • Page 8

    AD5232 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 5. Pin Function Descriptions Pin No. Mnemonic Description 1 CLK Serial Input Register Clock. Shifts in one bit at a time on positive clock edges. 2 SDI Serial Data Input. The MSB is ...

  • Page 9

    TYPICAL PERFORMANCE CHARACTERISTICS 2. 2.7V 1. 1.50 SS 1.25 1.00 INL T = –40°C A INL T 0.75 0.50 0.25 0 –0.25 INL T = +85°C A –0.50 –0.75 –1.00 –1.25 –1.50 –1.75 –2.00 ...

  • Page 10

    AD5232 5. 2. –50 –35 –20 – TEMPERATURE (°C) Figure 11. I vs. Temperature CH1 5.00V CH2 5.00V M 2.00ms CH3 5.00V ...

  • Page 11

    +2. –2. – 100mV rms 25°C A –60 ...

  • Page 12

    AD5232 TEST CIRCUITS Figure 22 to Figure 32 define the test conditions that are used in the Specifications section. NC DUT CONNECT Figure 22. Resistor Position Nonlinearity Error (Rheostat Operation; ...

  • Page 13

    DUT W V GND CONNECT Figure 30. Common-Mode Leakage Current RDAC1 RDAC2 OUT ...

  • Page 14

    AD5232 THEORY OF OPERATION The AD5232 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

    SERIAL DATA INTERFACE The AD5232 contains a 4-wire SPI-compatible digital interface (SDI, SDO and CLK) and uses a 16-bit serial data-word that is loaded MSB first. The format of the SPI-compatible word is shown in Table 7. The ...

  • Page 16

    AD5232 Command bits are identified as Cx, address bits are Ax, and data bits are Dx. The command instruction codes are defined in Table 8. The SDO output shifts out the last eight bits of data clocked into the serial ...

  • Page 17

    ADVANCED CONTROL MODES The AD5232 digital potentiometer contains a set of user program- ming features to address the wide variety of applications avail- able to these universal adjustment devices. Key programming features include the following: • Independently programmable read and ...

  • Page 18

    AD5232 USING ADDITIONAL INTERNAL, NONVOLATILE EEMEM The AD5232 contains additional internal user storage registers (EEMEM) for saving constants and other 8-bit data. Table 9 provides an address map of the internal nonvolatile storage registers, which are shown in the functional ...

  • Page 19

    Table 11. Nominal Individual Segment Resistor Values (Ω) Segmented Resistor Size for R End-to-End Values AB Device 10 kΩ 50 kΩ Resolution Version Version 8-Bit 78.10 390.5 PROGRAMMING THE VARIABLE RESISTOR Rheostat Operation The nominal resistances of the RDACx between ...

  • Page 20

    AD5232 PROGRAMMING THE POTENTIOMETER DIVIDER Voltage Output Operation The digital potentiometer easily generates an output voltage pro- portional to the input voltage applied to a given terminal. For example, connecting Terminal and Terminal B to GND ...

  • Page 21

    Table 16 illustrates using the left shift-by-one to change circuit gain steps. Table 16. SDI SDO Action 0xC1XX 0xXXXX Moves Wiper W2 to double the present data value contained in the RDAC2 register in the direction of ...

  • Page 22

    ... AD5232BRU100 2 AD5232BRU100-REEL7 2 2 AD5232BRUZ100 2 2 AD5232BRUZ100-REEL7 2 2 EVAL-AD5232-10EBZ 1 Line 1 contains the Analog Devices logo, followed by the date code: YYWW. Line 2 contains the model number, followed by the end-to-end resistance value. (Note that C = 100 kΩ). OR Line 1 contains the model number. Line 2 contains the Analog Devices logo, followed by the end-to-end resistance value. Line 3 contains the date code: YYWW. ...

  • Page 23

    NOTES Rev Page AD5232 ...

  • Page 24

    AD5232 NOTES ©2001–2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D02618-0-10/09(A) Rev Page ...