EVAL-AD5263EBZ

Manufacturer Part NumberEVAL-AD5263EBZ
DescriptionEVALUATION BOARD I.C.
ManufacturerAnalog Devices Inc
EVAL-AD5263EBZ datasheet
 

Specifications of EVAL-AD5263EBZ

Main PurposeDigital PotentiometerEmbeddedNo
Utilized Ic / PartAD5263Primary Attributes4 Channel, 256 Position
Secondary AttributesI²C & SPI InterfacesLead Free Status / RoHS StatusLead free / RoHS Compliant
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FEATURES
256-position, 4-channel
End-to-end resistance 20 kΩ, 50 kΩ, 200 kΩ
2
Pin-selectable SPI®- or I
C®-compatible interface
Power-on preset to midscale
Two package address decode pins AD0 and AD1
Rheostat mode temperature coefficient 30 ppm/°C
Voltage divider temperature coefficient 5 ppm/°C
Wide operating temperature range –40°C to +125°C
10 V to 15 V single supply; ±5 V dual supply
APPLICATIONS
Mechanical potentiometer replacement
Optical network adjustment
Instrumentation: gain, offset adjustment
Stereo channel audio level control
Automotive electronics adjustment
Programmable power supply
Programmable filters, delays, time constants
Line impedance matching
Low resolution DAC/trimmer replacement
Base station power amp biasing
Sensor calibration
GENERAL DESCRIPTION
The AD5263 is the industry’s first quad-channel, 256-position,
1
digital potentiometer
with a selectable digital interface. This
device performs the same electronic adjustment function as
mechanical potentiometers or variable resistors, with enhanced
resolution, solid-state reliability, and superior low temperature
coefficient performance.
Each channel of the AD5263 offers a completely programmable
value of resistance between the A terminal and the wiper or
between the B terminal and the wiper. The fixed A-to-B
terminal resistance of 20 kΩ, 50 kΩ, or 200 kΩ has a nominal
temperature coefficient of ±30 ppm/°C and a ±1% channel-to-
channel matching tolerance. Another key feature of this part is
the ability to operate from +4.5 V to +15 V, or at ±5 V.
Rev. B
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.
Quad, 15 V, 256-Position, Digital
Potentiometer with Pin-Selectable SPI/I
FUNCTIONAL BLOCK DIAGRAM
A1
V
DD
V
SS
SHDN
REGISTER
RES/AD1
V
L
CLK/SCL
SDI/SDA
CS/AD0
GND
Wiper position programming presets to midscale upon power-
on. Once powered, the VR wiper position is programmed by
either the 3-wire SPI or 2-wire I
2
I
C mode, additional programmable logic outputs enable users
to drive digital loads, logic gates, and analog switches in their
systems.
The AD5263 is available in a narrow body, 24-lead TSSOP.
All parts are guaranteed to operate over the automotive
temperature range of –40°C to +125°C.
For single- or dual-channel applications, refer to the
AD5260/AD5280 or AD5262/AD5282 data sheets.
1
The terms digital potentiometer, VR, and RDAC are used interchangeably.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
AD5263
W1
B1 A2
W2
B2 A3
W3
B3 A4
RDAC 1
RDAC 2
RDAC 3
RDAC 4
REGISTER
REGISTER
REGISTER
8
AD5263
ADDRESS
DECODER
SERIAL INPUT
REGISTER
2
SPI/I
C
SELECT
LOGIC
DIS
NC/O2
SDO/O1
Figure 1.
2
C-compatible interface. In the
www.analog.com
©2003–2009 Analog Devices, Inc. All rights reserved.
2
C
W4
B4

EVAL-AD5263EBZ Summary of contents

  • Page 1

    FEATURES 256-position, 4-channel End-to-end resistance 20 kΩ, 50 kΩ, 200 kΩ 2 Pin-selectable SPI® C®-compatible interface Power-on preset to midscale Two package address decode pins AD0 and AD1 Rheostat mode temperature coefficient 30 ppm/°C Voltage divider temperature coefficient ...

  • Page 2

    AD5263 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Electrical Characteristics—20 kΩ, 50 kΩ, 200 kΩ Versions ....... 3 Timing Characteristics—20 kΩ, 50 kΩ, 200 kΩ ...

  • Page 3

    ELECTRICAL CHARACTERISTICS—20 kΩ, 50 kΩ, 200 kΩ VERSIONS – Table 1. Parameter DC CHARACTERISTICS—RHEOSTAT MODE 2 Resistor Differential NL 2 Resistor Nonlinearity ...

  • Page 4

    AD5263 Parameter POWER SUPPLIES 8 Logic Supply Power Single-Supply Range Power Dual-Supply Range Logic Supply Current 9 Positive Supply Current Negative Supply Current 10 Power Dissipation Power Supply Sensitivity 6, 11 DYNAMIC CHARACTERISTICS Bandwidth (3 dB) Total Harmonic Distortion 12 ...

  • Page 5

    TIMING CHARACTERISTICS—20 kΩ, 50 kΩ, 200 kΩ VERSIONS = + – Table 2. Parameter SPI INTERFACE TIMING CHARACTERISTICS Clock Frequency Input Clock Pulse Width ...

  • Page 6

    AD5263 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter V to GND GND GND GND A B ...

  • Page 7

    PIN CONFIGURATION AND PIN FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin Name Description 1 B1 Resistor Terminal B1 Resistor Terminal A1 (ADDR = 00 Wiper Terminal W1 Resistor Terminal B3 Resistor ...

  • Page 8

    AD5263 TYPICAL PERFORMANCE CHARACTERISTICS kΩ, unless otherwise noted. AB 1.0 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1 128 160 CODE (Decimal) Figure 3. R-DNL vs. Code vs. Supply Voltage 1.0 ...

  • Page 9

    CODE (Decimal) Figure 9. INL vs. Code ± 1.0 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 ...

  • Page 10

    AD5263 +15/ – TEMPERATURE (°C) Figure 15. I vs. Temperature LOGIC ...

  • Page 11

    T – –60 1k 10k FREQUENCY (Hz) Figure 21. Gain vs. Frequency vs. Code –6 –12 –18 R ...

  • Page 12

    AD5263 1.0 0.5 0 –0.5 –1 – (– Figure 27. INL vs. Supply Voltage 2 20kΩ 25°C A 1.5 1.0 Avg – 3σ Avg 0.5 Avg – ...

  • Page 13

    TEST CIRCUITS Figure 29 to Figure 39 define the test conditions used in the product specification table DUT DD 1LSB = V+/ Figure 29. Test Circuit for Potentiometer Divider Nonlinearity Error (INL, DNL) ...

  • Page 14

    AD5263 DUT GND Figure 37. Test Circuit for Common-Mode Leakage Current I LOGIC V LOGIC SCL SCA Figure 38. Test Circuit for V Current vs. Digital Input ...

  • Page 15

    SPI-COMPATIBLE DIGITAL INTERFACE (DIS = 0) SERIAL DATA-WORD FORMAT MSB Addr Data SDI CLK CS V OUT 1 SDI Dx (DATA IN CLK 0 t CSHO t CSS ...

  • Page 16

    AD5263 2 I C-COMPATIBLE DIGITAL INTERFACE (DIS = 1) The word format maps in this section use the following abbreviations. Abbreviation Description S Start condition. P Stop condition. A Acknowledge. 2 AD1, AD0 I C device address bits. Must match ...

  • Page 17

    OPERATION The AD5263 is a quad-channel, 256-position, digitally controlled, variable resistor (VR) device. To program the VR settings, refer to the SPI-Compatible Digital 2 Interface (DIS = 0) section and the I C-Compatible Digital Interface (DIS = 1) section. The ...

  • Page 18

    ... AB to avoid clocking incorrect data into the serial input register. Standard logic families work well. If mechanical switches are used for product evaluation, they should be debounced by a with temperature has a flip-flop or other suitable means. When CS is low, the clock loads data into the serial register on each positive clock edge ...

  • Page 19

    The first 10 bits, complying with the format shown in the Serial Data-Word Format section and bit map and the second 10 bits, with the same format U1. CS should be ...

  • Page 20

    AD5263 4. After all data bits have been read or written, a STOP condition is established by the master. A STOP condition is defined as a low-to-high transition on the SDA line while SCL is high. In write mode, the ...

  • Page 21

    However, the digital inputs must also be level shifted to allow proper operation because the ground is referenced to the negative potential result, Figure 51 shows one implement- tation with a couple of transistors and a few resistors. ...

  • Page 22

    AD5263 RDAC CIRCUIT SIMULATION MODEL The internal parasitic capacitances and the external capacitive loads dominate the ac characteristics of the RDACs. Configured as a potentiometer divider, the –3 dB bandwidth of the AD5263 (20 kΩ resistor) measures 300 kHz at ...

  • Page 23

    APPLICATIONS BIPOLAR OPERATION FROM DUAL SUPPLIES The AD5263 can be operated from dual supplies, enabling control of ground referenced ac signals or bipolar operation. The ac signal, as high can be applied directly ...

  • Page 24

    AD5263 8-BIT BIPOLAR DAC Figure 60 shows a low cost, 8-bit, bipolar DAC. It offers the same number of adjustable steps, but not the precision as compared to conventional DACs. The linearity and temperature coefficient, especially at low values codes, ...

  • Page 25

    PROGRAMMABLE CURRENT SOURCE A programmable 4–20 mA current source can be implemented with the circuit shown in Figure 63. The REF191 is a unique low supply headroom and high current handling precision reference that can deliver ...

  • Page 26

    AD5263 PROGRAMMABLE LOW-PASS FILTER In analog-to-digital conversion applications common to include an antialiasing filter to band-limit the sampling signal. Dual-channel digital potentiometers can be used to construct a second-order Sallen-Key low-pass filter (see Figure 65). The design equations ...

  • Page 27

    RESISTANCE SCALING The AD5263 offers 20 kΩ, 50 kΩ, and 200 kΩ nominal resistances. Users who need a lower resistance and the same number of step adjustments can place multiple devices in parallel. For example, Figure 67 shows a simple ...

  • Page 28

    ... Package branding: Line 1 contains the model number, Line 2 contains the end-to-end resistance, and Line 3 contains the date code YYWW RoHS Compliant Part. 4 The evaluation board is shipped with the 20 kΩ Purchase of licensed I C components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I ...