Analog Devices UG-397 Manuale utente

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 I2C 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

UG-397 Evaluation Board User Guide

Rev. 0 | Page 2 of 16

TABLE OF CONTENTS

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

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

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

E VA L-AD5247DBZ 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

Software Operation .......................................................................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-397

Rev. 0 | Page 3 of 16

EVALUATION BOARD HARDWARE

POWER SUPPLIES

The EVA L -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 6.

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).

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-397 Evaluation Board User Guide

Rev. 0 | Page 4 of 16

TEST CIRCUITS

The EVAL-AD5247DBZ and EVAL-MB-LV-SDZ incorporate

several test circuits to evaluate the AD5247 performance.

DAC

RDAC can be operated as a digital-to-analog converter (DAC),

as shown in Figure 2.

VOUT1

R34

RDAC

AC+

BUF-W1

–

– V

VDD

10625-002

Figure 2. DAC

Table 4 shows the options available for the voltage references.

Table 4. DAC Voltage References

Terminal

Link

(DB1)

Link

(MB2) Options Description

A1 A2-B A9 AC+

Connects Terminal

A1 to VDD /2

VDD

Connects Terminal

A1 to VDD

W1 A3-B

BUF-

Connects Terminal

W1 to an output

buffer

B1 A10 AGND

inserted

1Daughter board

2Motherboard

The output voltage is defined in Equation 1.

128

)( RDAC

VV A

OUT  (1)

where:

RDAC is the code loaded in the RDAC register.

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

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

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

point to measure the voltage applied to the A terminal and

recalculate VAin Equation 1.

AC Signal Attenuation

RDAC can be used to attenuate an ac signal, which must be

provided externally using the AC_INPUT connector, as shown

in Figure 3.

VOUT1

R34

RDAC

AC+

BUF-W1

–

C_INPUT

–

HPF

1kHz

10625-003

Figure 3. AC Signal Attenuator

Depending on the voltage supply rails and the dc offset voltage

of the ac signal, various configurations can be used as described

in Table 5.

Table 5. AC Signal Attenuation Link Options

Link Options Conditions

A9 AC+ No dc offset voltage.

AC signal is outside the voltage supply rails

due to the dc offset voltage.

DC offset voltage ≠ VDD/2.

AC All other conditions.

A10 AGND All other conditions.

The signal attenuation is defined in Equation 2.















 ENDTOEND

WWB

nAttenuatio log20)dB( (2)

where:

RWB is the resistor between the W and ground.

RWis the wiper resistance.

REND-TO-END is the end-to-end resistance value.

Evaluation Board User Guide UG-397

Rev. 0 | Page 5 of 16

Signal Amplifier

RDAC can be operated as a noninverting signal amplifier

supporting pseudo logarithmic gain. Table 6 shows the available

configurations.

The noninverting amplifier with pseudologarithmic gain is

shown in Table 6, and the gain is defined in Equation 4.

G1 (4)

where:

RAW is the resistor between the W and A terminals.

RWB is the resistor between the W and B terminals.

VOUT2

VIN

RDAC

–

A2 B2

10nF

R41

1.7kΩ

R42

10625-004

Figure 4. Pseudologarithmic Noninverting Amplifier

R42 can be used to set the maximum and minimum gain limits.

Table 6. Amplifier Selection Link Options

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

Noninverting Pseudo logarithmic A2 = A3 = A4-A A7 LOC 0 V to VDD

A6 N-INV

A1 not inserted A8 N-INV

1Daughter board

2Motherboard

UG-397 Evaluation Board User Guide

Rev. 0 | Page 6 of 16

EVALUATION BOARD SOFTWARE

INSTALLING THE SOFTWARE

The E VA L -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).

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 E VA L -AD5247DBZ 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 > AD5247

>AD5247 Eval Board. To uninstall the program, click

Start > Control Panel > Add or Remove Programs >

AD5247 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 5). Simply connect the evaluation board to the USB

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

the instructions.

10625-005

Figure 5. Pop-Up Window Error

The main window of the E VA L -AD5247DBZ evaluation

software then opens, as shown in Figure 6.

10625-006

Figure 6. EVAL-AD5247DBZ Evaluation Board Software Main Window

Evaluation Board User Guide UG-397

Rev. 0 | Page 7 of 16

SOFTWARE OPERATION

The main window of the E VA L -AD5247DBZ 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-397 Evaluation Board User Guide

Rev. 0 | Page 8 of 16

SCHEMATICS AND ARTWORK

MOTHERBOARD

10625-007

Figure 7. SDP Connector and Power Supply

Evaluation Board User Guide UG-397

Rev. 0 | Page 9 of 16

10625-008

Figure 8. Schematic of Test Circuits

UG-397 Evaluation Board User Guide

Rev. 0 | Page 10 of 16

10625-009

Figure 9. Schematic of Connectors to Daughter Board

10625-010

Figure 10. Component Side View

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