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EVAL-AD5243SDZ User Guide

UG-346

One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Te l: 781.329.4700 • Fax: 781.461.3113 • www.analog.com

Evaluation Board for the AD5243 Digital Potentiometer

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 16

FEATURES

Full-featured evaluation board for the AD5243

Various test circuits

Various ac/dc input signals

PC control via a separately purchased system demonstration

platform (SDP-B)

PC software for control

PACKAGE CONTENTS

EVAL-AD5243SDZ

CD that includes

Self-installing software that allows users to control the

board and exercise all functions of the device

Electronic version of the AD5243 data sheet

Electronic version of the UG-346 user guide

GENERAL DESCRIPTION

This user guide describes the evaluation board for evaluating the

AD5243, a dual-channel, 256-position digital potentiometer.

The AD5243 supports single-supply 2.7 V to 5.5 V operation,

making the device suited for battery-powered applications and

many other applications.

In addition, the AD5243 uses a versatile I

C serial interface that

operates in fast mode, allowing speeds of up to 400 kbps.

The EVAL-AD5243SDZ can operate in single-supply mode and

incorporates an internal power supply from the USB.

Complete specifications for the AD5243 part are in the AD5243

data sheet, which is available from Analog Devices, Inc., and

should be consulted in conjunction with this user guide when

using the evaluation board.

DIGITAL PICTURE OF EVALUATION BOARD WITH SYSTEM DEMONSTRATION PLATFORM

EVAL-AD5243SDZ

SYSTEM DEMONSTRATION

PLATFORM

10364-001

Figure 1.

Summary of content (16 pages)

PAGE 1
EVAL-AD5243SDZ User Guide UG-346 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.
PAGE 2
UG-346 EVAL-AD5243SDZ User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Test Circuits ...................................................................................4 Package Contents.............................................................................. 1 Evaluation Board Software...............................................................6 General Description ...........................................
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EVAL-AD5243SDZ User Guide UG-346 EVALUATION BOARD HARDWARE POWER SUPPLIES LINK OPTIONS The EVAL-AD5243SDZ supports using single power supplies. Several link and switch options are incorporated in the evaluation board and should be set up before using the board. Table 2 describes the positions of the links to control the evaluation board by a PC, via the SDP-B board, using the EVAL-AD5243SDZ in single-supply mode. The functions of these link options are described in detail in Table 3 through Table 6.
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UG-346 EVAL-AD5243SDZ User Guide VDD – VSS TEST CIRCUITS 2 1µF The EVAL-AD5243SDZ incorporates several test circuits to evaluate the AD5243 performance. AC + DC AC AC_INPUT R34 A1 DAC RDAC1 RDAC1 can be operated as a digital-to-analog converter (DAC), as shown in Figure 2. AC + DC 2 VDD VDD W1 B1 R34 A1 W1 A1 W1 Depending on the voltage supply rails and the dc offset voltage of the ac signal, various configurations can be used as described in Table 5. Table 5.
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EVAL-AD5243SDZ User Guide UG-346 Signal Amplifier RDAC2 can be operated as an inverting or noninverting signal amplifier supporting linear or pseudologarithmic gains. Table 6 shows the available configurations. VOUT RWB2 R38 B2 OAVOUT R42 RDAC2 Note that the input signal, VIN, must be negative. G=− RWB2 R38 (5) where RWB2 is the resistor between the W2 and B2 terminals. Figure 4. Linear Noninverting Amplifier R41 1.
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UG-346 EVAL-AD5243SDZ User Guide EVALUATION BOARD SOFTWARE INSTALLING THE SOFTWARE The EVAL-AD5243SDZ evaluation kit includes evaluation board software provided on a CD. The software is compatible with Windows® XP, Windows Vista, and Windows 7 (both 32 bits and 64 bits). 1. 2. 3. 4. 5. Start the Windows operating system and insert the CD. The installation software opens automatically. If it does not, run the setup.exe file from the CD.
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EVAL-AD5243SDZ User Guide UG-346 SOFTWARE OPERATION REGISTER ACCESS has the following options: The main window of the EVAL-AD5243SDZ software is divided into the following sections: RDAC1, RDAC2, and REGISTER ACCESS. • RDAC1 and RDAC2 can be used to update the RDAC registers by entering a desirable value into the text box and clicking WRITE. Additionally, clicking SHUTDOWN allows placing the RDAC in shutdown mode. When the button is clicked, the bit toggles automatically. • Rev.
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A1 A1 Rev. 0 | Page 8 of 16 Figure 9.
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EVAL-AD5243SDZ User Guide UG-346 VDD 8 U15-C V+ V4 VDD VSS R39 AC_INPUT A1 C3 A20 A U15-A 3 2 R40 + 1 B C - VDD AC + DC AC R34 A1 AD8652AR VSS DAC + FLOATING DAC + BW W1-1 W1-2 W1-3 W1-4 W1-5 W1-6 W1-7 W1-8 W1-9 W1-10 W1-11 W1-12 AD8403-1 W1_BUF BUF-W1 AD5204-1 3 + 1 U14-A 2 AD8618ARZ AD5233-1 W1 AD5162-1 AD5232-1 ADN2850-1 W1 AD5235-1 R36 AD5254-1 PSEUDOLOG ATTENUATOR AD5252-1 AD5172 AD5243-1 B1 AD5222-1 A21 A VDD B1 R35 B1 B R3 C VSS 6 5 AD8652AR - 7 + U15-B 10364
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Rev. 0 | Page 10 of 16 W3-8 W3-3 W3-2 W3-1 AD5254-4 AD5233-4 AD5204-4 AD8403-4 AD5254-3 AD5233-3 AD5204-3 AD8403-3 W4-8 W4-3 W4-2 W4-1 W3 W4 BUF-3 BUF-4 A3 B4 A4 B3 10 + 8 U14-C 9 AD8618ARZ 12 + 14 U14-D 13 AD8618ARZ CHANNELS 3 AND 4 B3 VOUT3 A3 B4 VOUT4 A4 O1 Figure 12. Schematic of AD5243 Power Supplies and Other Channels O2 O2 O1 DIGITAL PINS +3.3V +5V GND GND EXT VSS B A A24 + V1 V2 V2 V1 + 10uF C27 C24 10uF C26 0.1uF C25 0.
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+3.3V 24LC01 1 A0 2 A1 3 A2 4 VSS D6 LED U25 8 VCC 7 WP 6 SCL 5 SDA 1K R37 Rev. 0 | Page 11 of 16 RESET_BF SHDN_BF MUX-A0|CS MUX-A2|U/D SCL_BF SDA_BF DIN_BF SCLK_BF SYNC_BF +5V +3.3V J22 Figure 13.
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EVAL-AD5243SDZ User Guide 10364-016 UG-346 10364-017 Figure 14. Component Side View 10364-018 Figure 15. Component Placement Drawing Figure 16. Layer 2 Side PCB Drawing Rev.
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UG-346 10364-019 EVAL-AD5243SDZ User Guide 10364-020 Figure 17. Layer 3 Side PCB Drawing Figure 18. Solder Side PCB Drawing Rev.
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UG-346 EVAL-AD5243SDZ User Guide ORDERING INFORMATION BILL OF MATERIALS Table 7.
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EVAL-AD5243SDZ User Guide Qty 1 Reference Designator U12 1 U13 1 1 A22 U15 1 U14 1 U25 1 UG-346 Description Dual, 1024-position digital rheostat with nonvolatile memory and SPI interface 2.5 V/3.
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UG-346 EVAL-AD5243SDZ User Guide NOTES I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors). ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD.