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Evaluation Board User Guide

UG-396

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 AD5246 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-AD5246DBZ

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 AD5246 data sheet

Electronic version of the UG-396 user guide

GENERAL DESCRIPTION

This user guide describes the evaluation board for evaluating the

AD5246, a single channel, 128-position, digital potentiometer.

The AD5246 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 AD5246 uses a versatile I

C serial interface that

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

The E VA L-AD5246DBZ 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 AD5246 part can be found in

the AD5246 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-AD5246DBZ WITH MOTHERBOARD AND SDP-B

10624-001

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-396 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-396 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-396 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 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 board. The functions of these link options are described in detail in Table 3 through Table 5.
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UG-396 Evaluation Board User Guide TEST CIRCUITS Table 4 shows the options available for the voltage references. The EVAL-AD5246DBZ and EVAL-MB-LV-SDZ incorporate several test circuits to evaluate the AD5246 performance. Table 4. DAC Voltage References Antilogarithmic DAC Terminal B RDAC can be operated as a antilogarithmic DAC, as shown in Figure 2. R35 should be replaced from the populated value of 0 Ω to the suggested value of 1.5 kΩ.
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Evaluation Board User Guide UG-396 Signal Amplifier RDAC can be operated as an inverting or noninverting signal amplifier supporting linear or pseudo logarithmic gains. Table 5 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  WB R38 The inverting amplifier with linear gain is shown in Figure 5, and the gain is defined in Equation 5. Note that the input signal, VIN, must be negative.
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UG-396 Evaluation Board User Guide EVALUATION BOARD SOFTWARE INSTALLING THE SOFTWARE RUNNING THE SOFTWARE The EVAL-AD5246DBZ 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-396 OPERATING THE SOFTWARE MANUAL WRITE The main window of the EVAL-AD5246DBZ 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-396 Evaluation Board User Guide SCHEMATICS AND ARTWORK MOTHERBOARD 10624-008 Figure 8. SDP Connector and Power Supply Rev.
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Evaluation Board User Guide UG-396 10624-009 Figure 9. Schematic of Test Circuits Rev.
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Evaluation Board User Guide 10624-010 UG-396 10624-011 Figure 10. Schematic of Connectors to Daughter Board Figure 11. Component Side View Rev.
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UG-396 10624-012 Evaluation Board User Guide 10624-013 Figure 12. Component Placement Drawing Figure 13. Layer 2 Side PCB Drawing Rev.
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UG-396 Evaluation Board User Guide DAUGHTER BOARD 10624-014 Figure 14. Schematic of Daughter Board Rev.
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UG-396 10624-015 Evaluation Board User Guide 10624-016 Figure 15. Component Side View Figure 16. Component Placement Drawing Rev.
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Evaluation Board User Guide 10624-017 UG-396 Figure 17. Layer 2 Side PCB Drawing Rev.
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Evaluation Board User Guide UG-396 ORDERING INFORMATION BILL OF MATERIALS Table 6. 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-396 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.