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EVAL-AD5222SDZ User Guide

UG-349

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

Evaluation Board for the AD5222 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 AD5222

Various test circuits

Various ac and dc input signals

PC control via a separately purchased system demonstration

platform (SDP-B)

PC software for control

PACKAGE CONTENTS

EVAL-AD5222SDZ board

CD that includes

Self-installing software that allows users to control the

board and exercise all functions of the device

Electronic version of the AD5222 data sheet

Electronic version of the UG-349 user guide

GENERAL DESCRIPTION

This user guide describes the evaluation board for evaluating

the AD5222—a dual-channel, 128-position, digital potentiometer

The AD5222 supports single-supply 2.7 V to 5.5 V operation,

making the device suited for battery-powered applications and

many other applications while offering a 0.2% channel-to-

channel matching tolerance.

In addition, the AD5222 uses a high speed up/down interface,

allowing speeds of up to 15 MHz.

The EVA L-AD5222SDZ can operate in single-supply mode and

incorporates an internal power supply from the USB.

Complete specifications for the AD5222 part can be found in

the AD5222 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-AD5222SDZ

SYSTEM DEMONSTRATION

PLATFORM

10367-001

Figure 1.

Summary of content (16 pages)

PAGE 1
EVAL-AD5222SDZ User Guide UG-349 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-349 EVAL-AD5222SDZ User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Test Circuits ...................................................................................4 Package Contents .............................................................................. 1 Evaluation Board Software ...............................................................6 General Description .........................................
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EVAL-AD5222SDZ User Guide UG-349 EVALUATION BOARD HARDWARE POWER SUPPLIES LINK OPTIONS The EVAL-AD5222SDZ supports using single power supplies. All supplies are decoupled to ground using 10 µF tantalum and 0.1 µF ceramic capacitors. 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-AD5222SDZ in single-supply mode.
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UG-349 EVAL-AD5222SDZ User Guide TEST CIRCUITS 1µF The EVAL-AD5222SDZ incorporates several test circuits to evaluate the AD5222 performance. VDD – VSS 2 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. W1 B1 AC + DC R34 A1 RDAC1 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-AD5222SDZ User Guide UG-349 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 Note that the input signal, VIN, must be negative. OAVOUT R42 RDAC2 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-349 EVAL-AD5222SDZ User Guide EVALUATION BOARD SOFTWARE INSTALLING THE SOFTWARE The EVAL-AD5222SDZ evaluation kit includes evaluation board software provided on a CD. The software is compatible with Windows® XP, Windows Vista, and Windows 7 (both 32-bit and 64-bit). 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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A1 A1 Rev. 0 | Page 7 of 16 Figure 9.
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UG-349 EVAL-AD5222SDZ User Guide VDD 8 U15-C V+ V4 VDD VSS R39 AC_INPUT A1 C3 A20 A U15-A 3 + 2 1 B C - R40 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 AD8652AR 6 - 5 7 + U15-B 1
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Rev. 0 | Page 9 of 16 W3-8 W3-3 W3-2 W3-1 AD8403-4 AD5254-4 AD5233-4 AD5204-4 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 AD5222 Power Supplies and Other Channels O2 O2 O1 DIGITAL PINS +3.3V +5V GND EXT VSS GND 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 10 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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UG-349 10367-016 EVAL-AD5222SDZ User Guide 10367-017 Figure 14. Component Side View 10367-018 Figure 15. Component Placement Drawing Figure 16. Layer 2 Side PCB Drawing Rev.
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EVAL-AD5222SDZ User Guide 10367-019 UG-349 10367-020 Figure 17. Layer 3 Side PCB Drawing Figure 18. Solder Side PCB Drawing Rev.
PAGE 13
EVAL-AD5222SDZ User Guide UG-349 ORDERING INFORMATION BILL OF MATERIALS Table 7.
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UG-349 EVAL-AD5222SDZ User Guide Qty 1 Reference Designator U12 1 U13 1 U14 1 U15 1 1 U25 A22 1 Description Dual, 1024-position digital rheostat with nonvolatile memory and SPI interface 2.5 V/3.
PAGE 15
EVAL-AD5222SDZ User Guide UG-349 NOTES Rev.
PAGE 16
UG-349 EVAL-AD5222SDZ 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.