Analog Devices EVAL-AD5141DBZ Manuel utilisateur

Evaluation Board User Guide

UG-473

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

Evaluating the AD5141 Digital Potentiometer

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.Rev. 0 | Page 1 of 20

FEATURES

Full featured evaluation 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-AD5141DBZ 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 AD5141 data sheet

Electronic version of the UG-473 user guide

GENERAL DESCRIPTION

This user guide describes the evaluation board for evaluating the

AD5141—a quad-channel, 256-position, nonvolatile memory,

digital potentiometer. With versatile programmability, the AD5141

allows multiple modes of operation, including read/write access

in the RDAC and EEMEM registers, increment/decrement of

resistance, resistance changes in ±6 dB scales, wiper setting read-

back, and extra EEMEM for storing user-defined information,

such as memory data for other components or a lookup table.

The AD5141 supports a dual-supply ±2.25 V to ±2.75 V operation

and a single-supply 2.3 V to 5.5 V operation, making the device

suitable for battery-powered applications and many other appli-

cations. In addition, the AD5141 can be configured as a versatile

I2C or SPI serial interface. The E VA L-AD5141DBZ can operate

in single-supply or dual-supply mode and incorporates an internal

power supply from the USB.

Complete specifications for the AD5141 part can be found in the

AD5141 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-AD5141DBZ WITH MOTHERBOARD AND SDP-S

11010-001

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

UG-473 Evaluation Board User Guide

Rev. 0 | Page 2 of 20

TABLE OF CONTENTS

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

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

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

E VA L-AD5141DBZ with Motherboard and SDP-S..................... 1

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

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

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

Digital Interface ............................................................................ 4

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

Evaluation Board Software...............................................................8

Installing the Software ..................................................................8

Software Operation .................................................................... 10

Evaluation Board Schematics and Artwork................................ 11

Motherboard ............................................................................... 11

Daughter Board .......................................................................... 15

Ordering Information.................................................................... 18

Bill of Materials........................................................................... 18

REVISION HISTORY

11/12—Revision 0: Initial Version

Evaluation Board User Guide UG-473

Rev. 0 | Page 3 of 20

EVALUATION BOARD HARDWARE

POWER SUPPLIES

The EVAL-MB-LV-SDZ motherboard supports using single and

dual power supplies.

The E VA L -AD5141DBZ 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 VDD Analog positive power supply, VDD.

Single supply from 2.3 V to 5.5 V.

Dual supply from 2.25 V to 2.75 V.

J1-2 AGND Analog ground.

J1-3

VSS

Analog negative power supply, V

Dual supply from −2.25 V to −2.75 V.

J2-1 VLOGIC Digital supply, from 1.8 V to VDD.

J2-2 DGND Digital ground.

Link Options

Several link and switch options are incorporated in the E VA L -

MB-LV-SDZ motherboard and should be set up before using

the board. Table 2 describes the positions of the links to control

the evaluation board via the SDP board using a PC. The

functions of these link options are described in detail in Table 3

through Table 11.

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

Link No. Option

A5 +3V3

A11 3.3 V

A12 AGND

Linear Gain Setting Mode

The linear gain setting mode pin can be controlled directly by

Jumper A5. If the jumper is placed in Position A, the AD5141

powers up in potentiometer mode, and the linear gain setting

mode can be controlled by software. If the jumper is placed in

Position B, the part powers up in linear gain setting mode,

loading independent values for each resistor string—RAW and

RWB,. The jumper cannot be placed in potentiometer mode

again unless the jumper is manually placed in Position A.

Table 3. Link Functions

Link No.

Power Supply

Options

LOGIC

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

+3V3 (3.3 V from SDP).

VLOGIC EXT (external supply from the J2 connector).

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

+5 V (5 V from SDP).

3V3 (3.3 V from SDP).

VDD (external supply from the J1 connector).

A12

This link selects one of the following as the negative power supply:

AGND.

EXTVSS (external supply from the J1 connector).

UG-473 Evaluation Board User Guide

Rev. 0 | Page 4 of 20

DIGITAL INTERFACE

The E VA L -AD5141DBZ can be configured as an I2C or SPI

digital interface, depending on the position in the A2 jumper

(see Table 4).

Table 4. Interface Selection

A2 Jumper Position Digital Interface

A SPI

B I2C

If the part is configured in I2C mode, the A3 and A4 jumpers

select the I2C address (see Table 5).

Table 5. I2C Address Selection

A3 Jumper Position A4 Jumper Position Address

A A 0101111

A B 0100011

B A 0101100

B B 0100000

TEST CIRCUITS

The E VA L -AD5141DBZ and E VA L -MB-LV-SDZ incorporate

several test circuits to evaluate the performance of the AD5141.

DAC

The digiPOT can be operated as a digital-to-analog converter

(DAC), as shown in Figure 2. Table 6 and Figure 7 describe the

options available for the voltage references.

The output voltage is defined in Equation 1.

256

)

(RDAC1

OUT

−=

(1)

where:

RDAC1 is the code loaded in the RDAC1 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 and R35 external resistors, the user

can reduce the voltage of the voltage references. In this case, use

the A1 and B1 test points to measure the voltage applied to the

A and B terminals and to recalculate VAand VBin Equation 1.

Table 6. DAC Voltage References Motherboard Links

Terminal Link Options Description

AC+

Connects Terminal A1 to V

VDD Connects Terminal A1 to VDD

W1 BUF-W1 Connects Terminal W1 to an

output buffer

B1 A10 BIAS Connects Terminal B1 to VDD/2

VSS Connects Terminal B1 to VSS

AGND Connects Terminal B1 to

analog ground

Table 7. DAC Voltage References Daughter Board Links

Link

Options

Description

A6 B Connects Terminal A to A1

A7 B Connects Terminal W to W1

A8 B Connects Terminal B to B1

A1 IN Closes feedback loop of second op amp

in the AD8618

11010-002

VOUT1

R34

R35

RDACA

AC+

AGND

BIAS

VSS

BUF-W1

AC_INPUT

1kHz

HPF

Figure 2. DAC

Evaluation Board User Guide UG-473

Rev. 0 | Page 5 of 20

AC Signal Attenuation

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

provided externally using the AC_INPUT connector, as shown

in Figure 3.

Depending on the voltage supply rails and the dc offset voltage

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

in Table 8 and Table 9.

Table 8. AC Signal Attenuation Daughter Board Links

Link Options Description

A6 B Connects Terminal A to A1

A7 B Connects Terminal W to W1

A8 B Connects Terminal B to B1

A1 IN Closes feedback loop of second op amp in the

AD8618

The signal attenuation is defined in Equation 2.











+

×=

WWB1

nAttenuatio log20)dB(

(2)

where:

RWis the wiper resistance.

RAB is the end-to-end resistance value.

RWB1 is the resistor between the W1 and B1 terminals.

Table 9. AC Signal Attenuation Link Motherboard Links

Voltage

Supply

Maximum

AC Signal

Amplitude Link Options Conditions

Single VDD A9 AC+ No dc offset voltage;

the ac signal is

outside the voltage

supply rails due to

the dc offset voltage;

or the dc offset

voltage ≠ VDD/2.1

AC All other conditions.

A10 BIAS Use in conjunction

with the AC+ link.

GND All other conditions.

Dual VDD/VSS A9 AC+ The ac signal is

outside the voltage

supply rails due to

the dc offset voltage;

the dc offset

voltage ≠ 0 V.1

AC All other conditions.

A10 GND Use in conjunction

with the AC+ link.

VSS All other conditions.

1Recommended to ensure optimal total harmonic distortion (THD) performance.

11010-003

VOUT1

R34

R35

RDAC

AC+

AGND

BIAS

VSS

BUF-W1

AC_INPUT

1kHz

HPF

VDD

Figure 3. AC Signal Attenuator

UG-473 Evaluation Board User Guide

Rev. 0 | Page 6 of 20

Signal Amplifier

The RDAC can be operated as an inverting or noninverting

signal amplifier supporting linear or pseudologarithmic gains.

Table 10 and Table 11 show the available configurations.

The noninverting amplifier with linear gain is shown in Figure 4,

and the gain is defined in Equation 3.

G+

(3)

where:

RWB is the code loaded for the RWB resistance.

RAW is the code loaded for the RAW resistance.

11010-004

VOUT2

RDAC

R42

10nF

A B

R41

1.7kΩ

R43

Figure 4. Linear Noninverting Amplifier

R43 and R42 can be used to set the maximum and minimum

gain limits.

The noninverting amplifier with pseudologarithmic gain is

shown in Figure 5, and the gain is defined in Equation 4.

RDAC

G−

+= 256

(4)

where:

RDAC is the code loaded in the RDAC.

11010-005

VOUT2

RDAC

R42

10nF

R41

1.7kΩ

R43

Figure 5. Pseudologarithmic Noninverting Amplifier

R43 and R42 can be used to set the maximum and minimum

gain limits.

The inverting amplifier with linear gain is shown in Figure 6,

and the gain is defined in Equation 5.

Note that the input signal, VIN, must be negative.

G−

(5)

where:

RWB is the code loaded for the RWB resistance.

RAW is the code loaded for the RAW resistance.

11010-006

VOUT2

RDAC

R42

10nF

R41

1.7kΩ

R43 A2

Figure 6. Linear Inverting Amplifier

R43 and R42 can be used to set the maximum and minimum

gain limits.

Table 10. Amplifier Selection Daughter Board Link Options

Link Options Description

A6 A Connects Terminal A to A2

A7 A Connects Terminal W to W2

A8 A Connects Terminal B to B2

A1 OUT Open short circuit for the AD8618

The inverting amplifier with pseudologarithmic gain is shown

in Figure 7, and the gain is defined in Equation 6.

RDAC

G−

−= 256

(6)

where:

RDAC is the code loaded in the RDAC.

11010-007

VOUT2

RDAC

R42

10nF

R41

1.7kΩ

R43 A2

Figure 7. Pseudologarithmic Inverting Amplifier

R43 and R42 can be used to set the maximum and minimum

gain limits.

Evaluation Board User Guide UG-473

Rev. 0 | Page 7 of 20

Table 11. Amplifier Selection Motherboard Link Options

Amplifier Gain

Linear Setting

Gain Mode Enabled Link Label

Noninverting Linear Yes A7 LIN

A6 N-INV

N-INV

Pseudologarithmic No A7 LOG

N-INV

A8 N-INV

Inverting Linear Yes A7 LIN

A6 INV

A8 INV

Pseudologarithmic No A7 LOG

INV

A8 INV

UG-473 Evaluation Board User Guide

Rev. 0 | Page 8 of 20

EVALUATION BOARD SOFTWARE

INSTALLING THE SOFTWARE

The E VA L -AD5141DBZ kit includes a CD containing the

evaluation board software. 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,

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

the CD-ROM drive.

2. The installation software opens automatically. If it does not

open automatically, run the setup.exe file from the CD.

3. After the installation is complete, power up the evaluation

board as described in the Power Supplies section.

4. Connect the E VA L-AD5141DBZ and E VA L -MB-LV-SDZ

to the SDP board, and then connect the SDP board to the

PC using the USB cable included with the SDP board.

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

instructions that appear to finalize the installation.

To run the program, do the following:

1. Click Start > All Programs > Analog Devices > AD5141

> AD5141 Eval Board. To uninstall the program, click

Start > Control Panel > Add or Remove Programs >

AD5141 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 8). Simply connect the evaluation board to the USB

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

the instructions.

11010-008

Figure 8. Pop-Up Window Error

The main window of the E VA L -AD5141DBZ software then

opens, as shown in Figure 9.

Evaluation Board User Guide UG-473

Rev. 0 | Page 9 of 20

11010-020

Figure 9. EVAL-AD5141DBZ Software Main Window

UG-473 Evaluation Board User Guide

Rev. 0 | Page 10 of 20

SOFTWARE OPERATION

The main window of the E VA L -AD5141DBZ software has two

tabs, Visual Mode and Manual Control.

Visual Mode

The Visual Mode tab is divided into the following sections:

ALL CHANNELS COMMANDS, INDIVIDUAL CHANNEL

COMMANDS, and a block diagram that contains boxes for

changing the control register values and buttons and for controlling

the hardware pins.

The ALL CHANNELS COMMANDS section allows you to

send quick commands directly to the AD5141.

The INDIVIDUAL CHANNEL COMMANDS section allows

you to send quick commands to only specific channels of

the AD5141.

The block diagram allows you to update the control register

status. Each register value can be easily updated by changing the

value in its respective block within the diagram. In addition,

buttons are available that allow you to change the level of some

hardware pins.

Manual Mode

The Manual Mode tab, as shown in Figure 10, allows you to

customize an I2C data-word by manually switching the scroll

bars from 0 to 1 or from 1 to 0, as desired, and then clicking

SEND DATA.

11010-021

Figure 10. Manual Mode

Table des matières

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