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Evaluation Board User Guide

UG-397

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 AD5247 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 board 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-AD5247DBZ

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 AD5247 data sheet

Electronic version of the UG-397 user guide

GENERAL DESCRIPTION

This user guide describes the evaluation board for evaluating the

AD5247, a single channel, 128-position digital potentiometer.

The AD5247 supports a single-supply 2.7 V to 5.5 V operation,

making the device suited for battery-powered applications and

many other applications with a superior low temperature

coefficient performance.

In addition, the AD5247 uses a versatile I

C serial interface that

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

The E VA L-AD5247DBZ and E VA L-MB-LV-SDZ can operate in

single-supply mode and incorporate an internal power supply

from the USB.

Complete specifications for the AD5247 part can be found in

the AD5247 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-AD5247DBZ WITH MOTHERBOARD AND SDP-B

10625-001

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-397 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-397 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Evaluation Board Software ...............................................................6 Package Contents .............................................................................. 1 Installing the Software ..................................................................6 General Description ..............................................
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Evaluation Board User Guide UG-397 EVALUATION BOARD HARDWARE LINK OPTIONS POWER SUPPLIES The EVAL-MB-LV-SDZ supports using single power supplies. The evaluation board can be powered either from the SDP port or externally by the J1 and J2 connectors as described in Table 1. All supplies are decoupled to ground using 10 µF tantalum and 0.1 µF ceramic capacitors. Table 1. Maximum and Minimum Voltages of the Connectors Connector No.
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UG-397 Evaluation Board User Guide TEST CIRCUITS AC Signal Attenuation The EVAL-AD5247DBZ and EVAL-MB-LV-SDZ incorporate several test circuits to evaluate the AD5247 performance. RDAC can be used to attenuate an ac signal, which must be provided externally using the AC_INPUT connector, as shown in Figure 3. DAC RDAC can be operated as a digital-to-analog converter (DAC), as shown in Figure 2.
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Evaluation Board User Guide UG-397 VIN RDAC can be operated as a noninverting signal amplifier supporting pseudo logarithmic gain. Table 6 shows the available configurations. + A2 C1 10nF – W2 The noninverting amplifier with pseudologarithmic gain is shown in Table 6, and the gain is defined in Equation 4. G 1 R41 1.7kΩ W B A B2 R42 RDAC VOUT2 10625-004 Signal Amplifier Figure 4.
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UG-397 Evaluation Board User Guide EVALUATION BOARD SOFTWARE INSTALLING THE SOFTWARE RUNNING THE SOFTWARE The EVAL-AD5247DBZ 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, use the following steps: Install the software before connecting the SDP board to the USB port of the PC to ensure that the SDP board is recognized when it is connected to the PC.
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Evaluation Board User Guide UG-397 SOFTWARE OPERATION MANUAL WRITE The main window of the EVAL-AD5247DBZ software is divided into the following sections: RDAC and MANUAL DATA. SEND DATA is a customized I2C data-word can be sent by manually switching the scroll bars from 0 to 1 or from 1 to 0 as desired and then clicking SEND DATA. RDAC WRITE can be used to update the RDAC registers by entering a desirable value into the text box and clicking WRITE.
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UG-397 Evaluation Board User Guide SCHEMATICS AND ARTWORK MOTHERBOARD 10625-007 Figure 7. SDP Connector and Power Supply Rev.
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Evaluation Board User Guide UG-397 10625-008 Figure 8. Schematic of Test Circuits Rev.
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Evaluation Board User Guide 10625-009 UG-397 10625-010 Figure 9. Schematic of Connectors to Daughter Board Figure 10. Component Side View Rev.
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UG-397 10625-011 Evaluation Board User Guide 10625-012 Figure 11. Component Placement Drawing Figure 12. Layer 2 Side PCB Drawing Rev.
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UG-397 Evaluation Board User Guide 10625-013 DAUGHTER BOARD Figure 13. Schematic of Daughter Board Rev.
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UG-397 10625-014 Evaluation Board User Guide 10625-015 Figure 14. Component Side View Figure 15. Component Placement Drawing Rev.
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Evaluation Board User Guide 10625-016 UG-397 Figure 16. Layer 2 Side PCB Drawing Rev.
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Evaluation Board User Guide UG-397 ORDERING INFORMATION BILL OF MATERIALS Table 7. Motherboard Qty 3 3 5 Reference Designator BUF-3, BUF-4, BUF-W1 A6, A7, A8 A5, A9, A10, A11, A12 Description 2-pin (0.1" pitch) header and shorting shunt 3-pin SIL header and shorting link 6-pin (3 × 2) 0.
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UG-397 Evaluation Board User Guide Table 8. Daughter Board Qty 1 1 2 1 1 1 1 2 1 Reference Designator U1 A1 A2, A3 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.