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EVAL-AD5162SDZ User Guide

UG-348

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 AD5162 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 AD5162

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-AD5162SDZ 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 AD5162 data sheet

Electronic version of the UG-348 user guide

GENERAL DESCRIPTION

This user guide describes the evaluation board for evaluating the

AD5162, a dual-channel, 256-position digital potentiometer.

The AD5162 supports a single-supply 2.7 V to 5.5 V operation,

making the device suitable for battery-powered applications and

many other applications. In addition, the AD5162 uses a versa-

tile SPI-compatible serial interface, allowing speeds of up

to 25 MHz.

The EVA L-AD5162SDZ can operate in single-supply mode and

incorporates an internal power supply from the USB.

Complete specifications for the AD5162 part can be found in

the AD5162 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

Figure 1.

EVAL-AD5162SDZ

SYSTEM DEMONSTRATION

PLATFORM

10366-001

Summary of content (16 pages)

PAGE 1
EVAL-AD5162SDZ User Guide UG-348 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.
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UG-348 EVAL-AD5162SDZ User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Test Circuits ...................................................................................4 Package Contents .............................................................................. 1 Evaluation Board Software ...............................................................6 General Description .........................................
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EVAL-AD5162SDZ User Guide UG-348 EVALUATION BOARD HARDWARE POWER SUPPLIES LINK OPTIONS The EVAL-AD5162SDZ 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 EVALAD5162SDZ 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-348 EVAL-AD5162SDZ User Guide TEST CIRCUITS AC Signal Attenuation The EVAL-AD5162SDZ incorporates several test circuits to evaluate the AD5162 performance. RDAC1 can be used to attenuate an ac signal, which must be provided externally using the AC_INPUT connector, as shown in Figure 3. DAC RDAC1 can be operated as a digital-to-analog converter (DAC), as shown in Figure 2.
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EVAL-AD5162SDZ User Guide UG-348 RDAC2 can be operated as an inverting or noninverting signal amplifier supporting linear or pseudologarithmic gains. Table 6 shows the available configurations. The noninverting amplifier with linear gain is shown in Figure 4, and the gain is defined in Equation 3. R G = 1 + WB2 R38 The inverting amplifier with linear gain is shown in Figure 5, and the gain is defined in Equation 4. Note that the input signal, VIN, must be negative.
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UG-348 EVAL-AD5162SDZ User Guide EVALUATION BOARD SOFTWARE INSTALLING THE SOFTWARE RUNNING THE SOFTWARE The EVAL-AD5162SDZ 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). To run the program, do the following: 1. 2. Install the software before connecting the SDP-B board to the USB port of the PC to ensure that the SDP-B board is recognized when it is connected to the PC. 4. 5.
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EVAL-AD5162SDZ User Guide UG-348 SOFTWARE OPERATION REGISTER ACCESS has the following options: The main window of the EVAL-AD5162SDZ 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. • Rev.
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A1 A1 Rev. 0 | Page 8 of 16 Figure 8.
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EVAL-AD5162SDZ User Guide UG-348 VDD 8 U15-C V+ V4 VDD VSS R39 AC_INPUT A1 C3 A20 A U15-A 3 + 2 1 C - R40 VDD AC + DC AC B 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
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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 11. Schematic of AD5162 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 12.
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EVAL-AD5162SDZ User Guide 10366-016 UG-348 10366-017 Figure 13. Component Side View 10366-018 Figure 14. Component Placement Drawing Figure 15. Layer 2 Side PCB Drawing Rev.
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UG-348 10366-019 EVAL-AD5162SDZ User Guide 10366-020 Figure 16. Layer 3 Side PCB Drawing Figure 17. Solder Side PCB Drawing Rev.
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UG-348 EVAL-AD5162SDZ User Guide ORDERING INFORMATION BILL OF MATERIALS Table 7.
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EVAL-AD5162SDZ User Guide UG-348 RELATED LINKS Resource AD5162 AD5233 AD5222 AD5254 AD5204 AD5252 AD5232 AD5235 ADN2850 ADG3247 ADG658 AD8652 AD8618 Description Product Page, 256-Position Dual-Channel SPI Compatible Digital Potentiometer Product Page, Nonvolatile, Quad, 64-Position Digital Potentiometer Product Page, Dual, Increment/Decrement Digital Potentiometer Product Page, Quad 256-Position I2C Nonvolatile Memory, Digital Potentiometer Product Page, 4-Channel Digital Potentiometer Product Page, I2C,
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UG-348 EVAL-AD5162SDZ 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.