Analog Devices UG-396 Manual de usuario

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 I2C 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

UG-396 Evaluation Board User Guide

Rev. 0 | Page 2 of 16

TABLE OF CONTENTS

Features .............................................................................................. 1

Package Contents.............................................................................. 1

General Description ......................................................................... 1

E VA L-AD5246DBZ With Motherboard and SDP-B ................... 1

Revision History ............................................................................... 2

Evaluation Board Hardware ............................................................ 3

Power Supplies .............................................................................. 3

Link Options ................................................................................. 3

Test Circuits................................................................................... 4

Evaluation Board Software...............................................................6

Installing the Software ..................................................................6

Running the Software ...................................................................6

Operating the Software.................................................................7

Schematics and Artwork ..................................................................8

Motherboard ..................................................................................8

Daughter Board .......................................................................... 12

Ordering Information.................................................................... 15

Bill of Materials........................................................................... 15

REVISION HISTORY

5/12—Revision 0: Initial Version

Evaluation Board User Guide UG-396

Rev. 0 | Page 3 of 16

EVALUATION BOARD HARDWARE

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. Label Voltage

J1-1

EXT VDD

Analog positive power supply, V

;

from 2.7 V to 5.5 V.

J1-2 GND Analog ground.

J2-1 VLOGIC Digital supply, from 2.7 V to VDD.

J2-2 DGND Digital ground.

LINK OPTIONS

Several link and switch options are incorporated in the EVAL-

MB-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.

Table 2. Link Options Setup for SDP Control (Default)

Link No. Option

A11 3.3 V

A12 AGND

A5 3.3 V

Table 3. Link Functions

Link No. Power Supply Options

A11 VDD This link selects one of the following as the positive power supply:

5 V (from SDP). It is not recommended to power the board with this supply due to SDP voltage limitations.

3.3 V (from SDP).

VDD (external supply from the J1 connector).

A5 VLOGIC This link selects one of the following as the digital supply:

3.3 V (from SDP).

VLOGIC EXT (external supply from the J2 connector).

A12 GND AGND.

UG-396 Evaluation Board User Guide

Rev. 0 | Page 4 of 16

TEST CIRCUITS

The EVAL-AD5246DBZ and EVAL-MB-LV-SDZ incorporate

several test circuits to evaluate the AD5246 performance.

Antilogarithmic DAC

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.

VOUT1

EXTERNAL

CONNECTION

R34

RDAC

AC+

BUF-W1 +

–

– V

VDD

R35

BIAS

– V

AGND

10624-002

Figure 2. DAC

The output voltage plot is shown in Figure 3. The output voltage

is relative to VAand VB.

1.0

0.8

0.6

0.4

0.2

0 20406080100120

DECIMAL CODE

REL

TIVE OUTPUT VOLTAGE

10624-003

Figure 3. Antilogarithmic Gain

Table 4 shows the options available for the voltage references.

Table 4. DAC Voltage References

Terminal

Link

(DB1)

Link

(MB2) Options Description

B A2-B A9 AC+

Connects

Terminal A1 to

VDD/2

VDD

Connects

Terminal A1 to

VDD

W A3-B BUF-W1 Connects

Terminal W1

to an output

buffer

R35 A10 BIAS

Connects

Terminal B1 to

VDD/2

AGND

Connects

Terminal B1 to

analog

ground

inserted

1 Daughter board

2 Motherboard

The output voltage is defined in Equation 1.

OUT RR

VVV





)( (1)

k10

128

 RDAC

RWB

where:

RDAC is code loaded in the RDAC register.

VAis the voltage applied to the A terminal (A9 link).

VBis the voltage applied to the B terminal (A10 link).

However, by using the R34 external resistor, the user can reduce

the voltage of the voltage reference. In this case, use the A1 test

point to measure the voltage applied to the A terminal and

recalculate VAin Equation 1.

Evaluation Board User Guide UG-396

Rev. 0 | Page 5 of 16

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.

R38

GWB

 1(2)

where RWB is the resistor between the W and B terminals.

VOUT2

RDAC

–

10nF

R41

1.7kΩ

R42

10624-004

R38

2.7kΩ

Figure 4. Linear Noninverting Amplifier

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.

R38

GWB

 (3)

where RWB is the resistor between the W and B terminals.

VOUT2

RDAC

–

10nF

R41

1.7kΩ

R42

R38

2.7kΩ

10624-005

Figure 5. Linear Inverting Amplifier

Table 5. Amplifier Selection Link Options

Amplifier Gain Link(DB1) Link (MB2) Label VIN Range

Noninverting Linear A2 = A3-A A7 LIN 0 V to VDD

A6 N-INV

A1 not inserted A8 N-INV

Inverting Linear A2 = A3-A A7 LIN −VDD to 0 V

A6 INV

A1 not inserted A8 INV

1Daughter board.

2Motherboard.

UG-396 Evaluation Board User Guide

Rev. 0 | Page 6 of 16

EVALUATION BOARD SOFTWARE

INSTALLING THE SOFTWARE

The E VA L -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).

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. To install the software, use the

following steps:

1. Start the Windows operating system and insert the CD.

2. The installation software opens automatically. If it does

not, run the setup.exe file from the CD.

3. After installation is completed, power up the evaluation

board as described in the Power Supplies section.

4. Connect the EVA L -AD5246DBZ and EVA L -MB-LV-SDZ

into the SDP board and the SDP board into the PC using the

USB cable included in the evaluation kit.

5. When the software detects the evaluation board, follow the

instructions that appear to finalize the installation.

RUNNING THE SOFTWARE

To run the program, use the following steps:

1. Click Start > All Programs > Analog Devices > AD5246

>AD5246 Eval Board. To uninstall the program, click

Start > Control Panel > Add or Remove Programs >

AD5246 Eval Board.

2. If the SDP board is not connected to the USB port when

the software is launched, a connectivity error displays (see

Figure 6). Simply connect the evaluation board to the USB

port of the PC, wait a few seconds, click Rescan, and follow

the instructions.

10624-006

Figure 6. Pop-Up Window Error

3. The main window of the E VA L -AD5246DBZ evaluation

software then opens, as shown in Figure 7.

10624-007

Figure 7. EVAL-AD5246DBZ Evaluation Board Software Main Window

Evaluation Board User Guide UG-396

Rev. 0 | Page 7 of 16

OPERATING THE SOFTWARE

The main window of the E VA L -AD5246DBZ software is divided

into the following sections: RDAC and MANUAL DATA.

RDAC

WRITE can be used to update the RDAC registers by entering a

desirable value into the text box and clicking WRITE. When

WRITE is clicked, a write/read operation is performed, and the

value displayed in this section is updated with the actual RDAC

write operation was completed successfully.

MANUAL WRITE

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.

In addition, the scroll bars are updated on each write transfer,

showing the command sent to the part.

EXIT closes the program.

UG-396 Evaluation Board User Guide

Rev. 0 | Page 8 of 16

SCHEMATICS AND ARTWORK

MOTHERBOARD

10624-008

Figure 8. SDP Connector and Power Supply

Evaluation Board User Guide UG-396

Rev. 0 | Page 9 of 16

10624-009

Figure 9. Schematic of Test Circuits

UG-396 Evaluation Board User Guide

Rev. 0 | Page 10 of 16

10624-010

Figure 10. Schematic of Connectors to Daughter Board

10624-011

Figure 11. Component Side View

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