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Evaluation Board User Guide

UG-394

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 AD5171 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 in conjunction with low voltage digiPOT

motherboard (EVAL-MB-LV-SDZ)

Various test circuits

Various ac/dc input signals

PC control via a separately purchased system demonstration

platform (SDP-B or SDP-S)

PC software for control

PACKAGE CONTENTS

EVAL-AD5171DBZ board

EVAL-MB-LV-SDZ motherboard

CD that includes

Self-installing software that allows users to control the

board and exercise all functions of the device

Electronic version of the AD5171 data sheet

Electronic version of the UG-394 user guide

GENERAL DESCRIPTION

This user guide describes the evaluation board for evaluating the

AD5171, a single-channel, 64-position, one-time programmable

(OTP) memory digital potentiometer that uses fuse link

technology to achieve memory retention of resistance settings.

The on-board socket allows the user to easily replace the device

for reprogramming of the OTP memory.

The AD5171 supports single-supply 2.7 V to 5.5 V operation,

making the device suited for battery-powered applications and

many other applications with superior low temperature

coefficient performance.

In addition, the AD5171 uses a versatile I

C serial interface that

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

The E VA L-MB-LV-SDZ can operate in single-supply mode and

incorporates an internal power supply from the USB.

Complete specifications for the AD5171 part can be found in

the AD5171 data sheet, which is available from Analog Devices,

Inc., and should be consulted in conjunction with this user

guide when using the evaluation board.

EVAL-AD5171DBZ WITH MOTHERBOARD AND SDP-B

10622-001

Figure 1. Digital Picture of Evaluation Board with Low Voltage DigiPOT Motherboard and System Demonstration Platform

Summary of content (16 pages)

PAGE 1
Evaluation Board User Guide UG-394 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-394 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Installing the Software ..................................................................6 Package Contents .............................................................................. 1 Running the Software ...................................................................6 General Description ...............................................
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Evaluation Board User Guide UG-394 EVALUATION BOARD HARDWARE POWER SUPPLIES Link Options The EVAL-MB-LV-SDZ supports using single-power supplies. Several link and switch options are incorporated in the EVALMB-LV-SDZ 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 board. The functions of these link options are described in detail in Table 3 through Table 6.
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UG-394 Evaluation Board User Guide TEST CIRCUITS 1kHz The EVAL-AD5171DBZ and EVAL-MB-LV-SDZ incorporate several test circuits to evaluate the performance of the AD5171. VDD 2 HPF AC+ AC AC_INPUT DAC R34 The RDAC can be operated as a digital-to-analog converter (DAC), as shown in Figure 2. VDD 2 RDAC A A1 W1 W AC+ VOUT1 BUF-W1 B B1 VDD VDD R35 A1 VDD RDAC A 2 W1 W BUF-W1 Figure 3.
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Evaluation Board User Guide UG-394 The RDAC can be operated as an inverting or noninverting signal amplifier supporting linear or pseudologarithmic gains. Table 6 shows the available configurations. C1 10nF A2 R43 B2 W A R42 B RDAC RWB R38 (3) R41 1.7kΩ The inverting amplifier with linear gain is shown in Figure 6, and the gain is defined in Equation 5. VOUT2 R38 2.7kΩ Note that the input signal, VIN, must be negative.
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UG-394 Evaluation Board User Guide EVALUATION BOARD SOFTWARE 2. INSTALLING THE SOFTWARE The EVAL-AD5171DBZ 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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Evaluation Board User Guide UG-394 SOFTWARE OPERATION RDAC has the following option: The main window of the EVAL-AD5171DBZ software is divided into the following sections: FUSE, RDAC, and MANUAL DATA. • FUSE has the following options: • • BLOW FUSE allows you to program the fuses. The A11 link must be connected to 5 V. If the board is operated at a different supply, close the program, change the link, and rerun the software.
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UG-394 Evaluation Board User Guide EVALUATION BOARD SCHEMATICS AND ARTWORK 10622-009 MOTHERBOARD Figure 9. SDP Connector and Power Supply Rev.
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Evaluation Board User Guide UG-394 10622-010 Figure 10. Schematic of Test Circuits Rev.
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Evaluation Board User Guide 10622-011 UG-394 10622-012 Figure 11. Schematic of Connectors to Daughter Board Figure 12. Component Side View Rev.
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UG-394 10622-013 Evaluation Board User Guide 10622-014 Figure 13. Component Placement Drawing Figure 14. Layer 2 Side PCB Drawing Rev.
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UG-394 Evaluation Board User Guide DAUGHTER BOARD 10619-022 Figure 15. Schematic of Daughter Board Rev.
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UG-394 10622-016 Evaluation Board User Guide 10622-017 Figure 16. Component Side View 10622-018 Figure 17. Component Placement Drawing Figure 18. Layer 2 Side PCB Drawing Rev.
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UG-394 Evaluation Board User Guide ORDERING INFORMATION BILL OF MATERIALS Table 7.
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Evaluation Board User Guide UG-394 Table 8. Daughter Board Qty 1 1 4 1 1 1 1 2 1 Reference Designator U1 A1 A2, A3, A4, A5 C6 C3 J1 J2 J3, J4 Description 256-position digital potentiometer 2-pin (0.1" pitch) header and shorting shunt 3-pin SIL header and shorting link 6.3 V tantalum capacitor (Case A), 10 μF, ±20% 50 V, X7R ceramic capacitor, 0.1 μF, ±10%, 0603 Header, 2.54 mm, PCB, 1 × 8-way 12-pin (2 × 6), 0.1" pitch header 5-pin SIL header FEC refers to Farnell Electronic Component Distributors.
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UG-394 Evaluation Board 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.