EVAL-AD5292EBZ

Manufacturer Part NumberEVAL-AD5292EBZ
DescriptionEVALUATION BOARD
ManufacturerAnalog Devices Inc
EVAL-AD5292EBZ datasheet
 


Specifications of EVAL-AD5292EBZ

Main PurposeDigital PotentiometerEmbeddedYes
Utilized Ic / PartAD5292Primary Attributes1 Channel, 256 Position
Secondary AttributesSPI InterfaceLead Free Status / RoHS StatusLead free / RoHS Compliant
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FEATURES
Single-channel, 256-/1024-position resolution
20 kΩ, 50 kΩ, and 100 kΩ nominal resistance
Maximum ±1% nominal resistor tolerance error (resistor
performance mode)
20-times programmable wiper memory
Rheostat mode temperature coefficient: 35 ppm/°C
Voltage divider temperature coefficient: 5 ppm/°C
+9 V to +33 V single-supply operation
±9 V to ±16.5 V dual-supply operation
SPI-compatible serial interface
Wiper setting readback
Power-on refreshed from 20-TP memory
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 AD5291 and AD5292 are single-channel, 256-/1024-
1
position digital potentiometers
that combine industry leading
variable resistor performance with nonvolatile memory (NVM)
in a compact package. These devices are capable of operating
across a wide voltage range, supporting both dual supply
operation at ±10.5 V to ±16.5 V and single supply operation at
+21 V to +33 V, while ensuring less than 1% end-to-end resistor
tolerance error and offering 20-time programmable (20-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
The terms digital potentiometer and RDAC are used interchangeably.
Rev. D
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.
256-/1024-Position, Digital Potentiometers with
Maximum ±1% R-Tolerance Error and 20-TP Memory
V
LOGIC
SCLK
SYNC
DIN
SDO
RDY
The AD5291 and AD5292 device wiper settings are controllable
through the SPI digital interface. Unlimited adjustments are
allowed before programming the resistance value into the
20-TP memory. The AD5291 and AD5292 do not require any
external voltage supply to facilitate fuse blow, and there are 20
opportunities for permanent programming. During 20-TP
activation, a permanent blow fuse command freezes the wiper
position (analogous to placing epoxy on a mechanical trimmer).
The AD5291 and AD5292 are available in a compact 14-lead
TSSOP package. The part is guaranteed to operate over the
extended industrial temperature range of −40°C to +105°C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
AD5291/AD5292
FUNCTIONAL BLOCK DIAGRAM
V
RESET
DD
POWER-ON
AD5291/
RESET
AD5292
RDAC
REGISTER
DATA
SERIAL
INTERFACE
OTP
MEMORY
BLOCK
V
EXT_CAP
GND
SS
Figure 1.
www.analog.com
©2009–2010 Analog Devices, Inc. All rights reserved.

EVAL-AD5292EBZ Summary of contents

  • Page 1

    FEATURES Single-channel, 256-/1024-position resolution 20 kΩ, 50 kΩ, and 100 kΩ nominal resistance Maximum ±1% nominal resistor tolerance error (resistor performance mode) 20-times programmable wiper memory Rheostat mode temperature coefficient: 35 ppm/°C Voltage divider temperature coefficient: 5 ppm/° ...

  • Page 2

    AD5291/AD5292 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Characteristics—AD5291 .......................................... 3 Resistor Performance Mode Code Range ................................. 4 Electrical Characteristics—AD5292 .......................................... 6 Resistor ...

  • Page 3

    SPECIFICATIONS ELECTRICAL CHARACTERISTICS—AD5291 10 16 −40°C < T < +105°C, unless otherwise noted. A Table 1. Parameter DC CHARACTERISTICS—RHEOSTAT MODE ...

  • Page 4

    AD5291/AD5292 Parameter DYNAMIC CHARACTERISTICS Bandwidth Total Harmonic Distortion V Settling Time W Resistor Noise Density 1 Typical values represent average readings at 25° Resistor position nonlinearity error. R-INL is the deviation from an ideal value ...

  • Page 5

    Table 3. |V − Resistor Tolerance DD SS per Code R-Tolerance From 0x2A From 0x00 to 0xFF to 0xD5 2% R-Tolerance From 0x11 From 0x00 to 0xFF ...

  • Page 6

    AD5291/AD5292 ELECTRICAL CHARACTERISTICS—AD5292 10 16 −40°C < T < +105°C, unless otherwise noted. A Table 4. Parameter DC CHARACTERISTICS—RHEOSTAT MODE ...

  • Page 7

    Parameter DYNAMIC CHARACTERISTICS Bandwidth Total Harmonic Distortion V Settling Time W Resistor Noise Density 1 Typical values represent average readings at 25° Resistor position nonlinearity error. R-INL is the deviation from an ideal value measured ...

  • Page 8

    AD5291/AD5292 Table 6. Resistor |V − Tolerance per DD SS Code R-Tolerance From 0x08C From 0x000 to 0x3FF to 0x35F 2% R-Tolerance From 0X03C From 0x000 to ...

  • Page 9

    Timing Diagrams SCLK SYNC DIN SDO t 10 RDY RESET SCLK SYNC DIN SDO RDY Figure 3. Write Timing Diagram, CPOL ...

  • Page 10

    AD5291/AD5292 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 8. Parameter V to GND GND GND LOGIC GND A B ...

  • Page 11

    PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 10. Pin Function Descriptions Pin No. Mnemonic Description 1 RESET Hardware Reset Pin. Refreshes the RDAC register with the contents of the 20-TP memory register. Factory default loads midscale until the first 20-TP wiper ...

  • Page 12

    AD5291/AD5292 TYPICAL PERFORMANCE CHARACTERISTICS 1.0 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 0 128 256 384 512 640 CODE (Decimal) Figure 6. R-INL in R-Perf Mode vs. Code vs. Temperature (AD5292) 0 20kΩ AB 0.5 ...

  • Page 13

    R = 20kΩ AB 0.10 0.05 0 –0.05 –0.10 –0.15 +25°C –40°C –0.20 0 128 256 384 512 640 CODE (Decimal) Figure 12. R-DNL in Normal Mode vs. Code vs. Temperature (AD5292) 1 20kΩ AB 1.0 0.5 ...

  • Page 14

    AD5291/AD5292 0 20kΩ AB 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 0 128 256 384 512 640 CODE (Decimal) Figure 18. INL in Normal Mode vs. Code vs. Temperature (AD5292) 0.10 0.05 0 –0.05 –0.10 –0.15 –0.20 ...

  • Page 15

    R = 20kΩ AB 0.12 0.10 0.08 0.06 0.04 0.02 0 –0.02 –0.04 +25°C –40°C –0. 128 160 CODE (Decimal) Figure 24. R-DNL in R-Perf Mode vs. Code vs. Temperature (AD5291) 0.25 +25°C –40°C 0.20 ...

  • Page 16

    AD5291/AD5292 0.25 –40°C +25°C 0.20 0.15 0.10 0.05 0 –0.05 –0.10 –0.15 –0. 20kΩ AB –0. 128 160 CODE (Decimal) Figure 30. INL in R-Perf Mode vs. Code vs. Temperature (AD5291) 0.14 +25°C –40°C ...

  • Page 17

    CODE (Decimal) Figure 36. DNL in Normal Mode vs. Code vs. Temperature (AD5291) 450 400 350 I LOGIC 300 250 200 150 100 ...

  • Page 18

    AD5291/AD5292 0 0x200 (0x80) –5 –10 0x100 (0x40) –15 0x080 (0x20) –20 0x040 (0x10) –25 0x020 ( 0x08) –30 0x010 (0x04) –35 0x008 (0x02) –40 0x004 (0x01) –45 0x002 0x001 –50 10 100 1k 10k FREQUENCY (Hz) Figure 42. 20 ...

  • Page 19

    CODE ...

  • Page 20

    AD5291/AD5292 –1 TIME (ms) Figure 54. V Waveform While Reading Fuse Or Calibration EXT_CAP –2 TIME (ms) Figure 55. V Waveform While Writing Fuse EXT_CAP 75 ...

  • Page 21

    TEST CIRCUITS Figure 58 to Figure 63 define the test conditions used in the Specifications section. NC DUT CONNECT Figure 58. Resistor Position Nonlinearity Error (Rheostat Operation; R-INL, R-DNL) DUT ...

  • Page 22

    AD5291/AD5292 THEORY OF OPERATION The AD5291 and AD5292 digital potentiometers are designed to operate as true variable resistors for analog signals that remain within the terminal voltage range of V < patented ±1% resistor tolerance feature helps to ...

  • Page 23

    MEMORY Once a desirable wiper position is found, the contents of the RDAC register can be saved into a 20-TP memory register (see Table 12). Thereafter, the wiper position is always set at that position for any future on-off-on ...

  • Page 24

    AD5291/AD5292 BASIC OPERATION The basic mode of setting the variable resistor wiper position (programming the RDAC register) is accomplished by loading the shift register with Command 1 (see Table 11) and the desired wiper position data. When the desired wiper ...

  • Page 25

    RESISTOR PERFORMANCE MODE This mode activates a new, patented 1% end-to-end resistor tolerance that ensures a ±1% resistor tolerance on each code, that is, code = half scale kΩ ± 100 Ω. See Table 2 WB (AD5291) ...

  • Page 26

    AD5291/AD5292 PROGRAMMING THE VARIABLE RESISTOR Rheostat Operation—1% Resistor Tolerance The AD5291 and AD5292 operate in rheostat mode when only two terminals are used as a variable resistor. The unused terminal can be left floating or tied to the W terminal, ...

  • Page 27

    Operation of the digital potentiometer in the voltage divider mode results in a more accurate operation over temperature. Unlike the rheostat mode, the output voltage is dependent mainly on the ratio of the internal resistors, R not the absolute values. ...

  • Page 28

    AD5291/AD5292 APPLICATIONS INFORMATION HIGH VOLTAGE DAC The AD5292 can be configured as a high voltage DAC, with output voltage as high The circuit is shown in Figure 70. The output is ⎡ ⎤ ⎛ ⎞ ...

  • Page 29

    AUDIO VOLUME CONTROL The excellent THD performance and high voltage capability make the AD5291 and AD5292 ideal for a digital volume control as an audio attenuator or gain amplifier. A typical problem in these systems is that a large step ...

  • Page 30

    ... AD5291BRUZ-20-RL7 20 AD5291BRUZ-50 50 AD5291BRUZ-50-RL7 50 AD5291BRUZ-100 100 AD5291BRUZ-100-RL7 100 AD5292BRUZ-20 20 AD5292BRUZ-20-RL7 20 AD5292BRUZ-50 50 AD5292BRUZ-50-RL7 50 AD5292BRUZ-100 100 AD5292BRUZ-100-RL7 100 EVAL-AD5292EBZ RoHS Compliant Part. 5.10 5.00 4. 6.40 BSC 1 7 0.65 BSC 1.20 0.20 MAX 0.09 SEATING 0.30 PLANE 0.19 COMPLIANT TO JEDEC STANDARDS MO-153-AB-1 Figure 76. 14-Lead Thin Shrink Small Outline Package [TSSOP] ...

  • Page 31

    NOTES Rev Page AD5291/AD5292 ...

  • Page 32

    AD5291/AD5292 NOTES ©2009–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07674-0-9/10(D) Rev Page ...