Analog Devices EVAL-AD51150SDZ Manuale utente

Evaluation Board User Guide

UG-322

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 AD5110 Digital Potentiometer

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.Rev. 0 | Page 1 of 12

FEATURES

Full-featured evaluation board for the AD5110

Several test circuits

Various ac/dc input signals

PC control via a separately purchased system demonstration

platform (SDP)

PC control software

Resistor tolerance error stored in EEMEM

PACKAGE CONTENTS

EVAL-AD511xSDZ evaluation board

CD that includes

Self-installing software that allows users to control the

board and exercise all functions of the device

Electronic version of the AD5110 data sheet

Electronic version of the UG-322 user guide

GENERAL DESCRIPTION

This user guide describes the evaluation board for evaluating the

AD5110—a single-channel, 128-position, nonvolatile memory

digital potentiometer.

The AD5110 supports single-supply 2.3 V to 5.5 V operation,

making the device suited for battery-powered applications and

many other applications, offering guaranteed low resistor

tolerance errors of ±8% and high bandwidth while allowing

up to ±6 mA current density in the A, B, and W pins.

The logic voltage levels operate from single 1.8 V to 5.5 V

supplies.

The versatile I2C-compatible digital interface allows readback

of the wiper register and EEPROM content which contain the

resistor tolerance, providing an end-to-end tolerance accuracy

of 0.1%.

The E VA L-AD5110SDZ can operate in single-supply mode and

incorporates an internal power supply from the USB.

Complete specifications for the AD5110 part can be found in

the AD5110 data sheet, which is available from Analog Devices,

Inc., and should be consulted in conjunction with this user

guide when using the evaluation board.

DIGITAL PICTURE OF EVALUATION BOARD WITH SYSTEM DEMONSTRATION PLATFORM

10199-001

Figure 1.

UG-322 Evaluation Board User Guide

Rev. 0 | Page 2 of 12

TABLE OF CONTENTS

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

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

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

Digital Picture of Evaluation Board with System

Demonstration Platform.................................................................. 1

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

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

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

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

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

Evaluation Board Software...............................................................5

Installing the Software ..................................................................5

Running the Software ...................................................................5

Software Operation .......................................................................6

Evaluation Board Schematics and Artwork...................................7

Ordering Information.................................................................... 11

Bill of Materials........................................................................... 11

REVISION HISTORY

11/11—Revision 0: Initial Version

Evaluation Board User Guide UG-322

Rev. 0 | Page 3 of 12

EVALUATION BOARD HARDWARE

POWER SUPPLIES

The E VA L -AD5110SDZ supports using single power supplies.

The evaluation board can be powered either from the SDP

port or externally by the EXTERNAL-1 and EXTERNAL-2

connectors, as described in Table 2.

The digital logic levels can be powered either from the SDP

port or externally by the VLOGIC_EXT-1 and VLOGIC_EXT-2

connectors, as described in Table 2.

All supplies are decoupled to ground using 10 µF tantalum and

0.1 µF ceramic capacitors.

LINK OPTIONS

Several link and switch options are incorporated in the evalu-

ation board and should be set up before using the board. Table 1

describes the positions of the links to control the evaluation board

by a PC, via the SDP board, using the E VA L -AD5110SDZ. The

functions of these link and switch options are described in

detail in Table 3.

Table 1. Link Options Setup for SDP Control (Default)

Link No. Option

LK2 3V3

LK8 +5V

Table 2. Maximum and Minimum Voltages of the Connectors

Connector Number Label Voltage

EXTERNAL-1 VDD Analog positive power supply, VDD.

If connected to the SDP, VDD is 3.3 V to 5.5 V.

If controlled externally, VDD is 2.3 V to 5.5 V.

EXTERNAL-2 AGND Analog ground, AGND.

VLOGIC_EXT-1 VLOGIC_EXT + Logic positive power supply, VLOGIC.

If connected to the SDP board, VLOGIC is 3.3 V.

If controlled externally, VLOGIC is 1.8 V to VDD.

VLOGIC_EXT-2 VLOGIC_EXT −Logic ground, DGND.

Table 3. Link Functions

Link Number Power Supply Option

LK2 VLOGIC This link selects one of the following as the logic power supply:

3V3 (from SDP).

EXT (external supply from the VLOGIC_EXT connector).

LK8 VDD This link selects one of the following as the positive power supply:

+5V (from SDP).

+3V3 (from SDP).

EXT1(external supply from the EXTERNAL connector).

1If the part is powered using the external connector without connecting the SDP board, +5V jumper must be connected as well.

UG-322 Evaluation Board User Guide

Rev. 0 | Page 4 of 12

TEST CIRCUITS

The E VA L -AD5110SDZ incorporates several test circuits to

evaluate the AD5110 performance.

DAC

The AD5110 can be operated as a digital-to-analog converter

(DAC), as shown in Figure 2.

VOUT

GND

BWBUF-W +

–

750Ω

12Ω

10199-002

Figure 2. DAC

Table 4 shows the options available for the voltage references.

Table 4. DAC Voltage References

Terminal Link Options Description

A LK1 AC Connects Terminal A to VDD/2

DC Connects Terminal A to VDD

W BUF-W Connects Terminal W to an

output buffer

B LK6 AC Connects Terminal B to VDD/2

GND Connects Terminal B to

analog ground

The output voltage is defined in Equation 1.

256

)( RDAC

VVV B

OUT ×−=

(1)

where:

RDAC is the code loaded in the RDAC register.

VAis the voltage applied to Ter minal A (LK1 link).

VBis the voltage applied to Terminal B (LK6 link).

However, by using the R8 and R9 external resistors, the user can

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

A and B test points to measure the voltage applied to the A and

B terminals and recalculate VAand VBin Equation 1.

AC Signal Attenuation

The AD5110 can be used to attenuate an ac signal, which must

be provided externally using the AC_INPUT connector, as

shown in Figure 3.

GND

BUF-W

AC_INPUT

WVOUT

–

VDD

HPF

C= 200Hz

12Ω

750Ω

10199-003

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

Terminal Link Options Description

A LK1 AC Remove dc voltage and biased

the signal to VDD/2

W BUF-W Connects Terminal W to an

output buffer

B LK6 AC1Connects Terminal B to VDD/2

GND Connects Terminal B to analog

ground

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

The signal attenuation is defined in Equation 2.













×≈ 128

log20)dB(RDAC

nAttenuatio

(2)

where:

RDAC is the code loaded in the RDAC register.

In addition, R7 can be used to achieve an exponential attenua-

tion. To do so, adjust the R7 resistor until a desirable transfer

function is found, typically around 1.6 kΩ for a 10 kΩ

potentiometer.

Evaluation Board User Guide UG-322

Rev. 0 | Page 5 of 12

EVALUATION BOARD SOFTWARE

INSTALLING THE SOFTWARE

The E VA L -AD5110SDZ evaluation kit includes evaluation

board software provided on a CD. The software is compatible

with Windows® XP, Windows Vista, and Windows 7 (both 32

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.

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 the installation is completed, power up the evaluation

board as described in the Power Supplies section.

4. P lu g t he EVA L -AD511xSDZ into the SDP board and the SDP

board into the PC using the USB cable included in the box.

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

instructions that appear to finalize the installation.

To uninstall the program, click Start > Control Panel > Add or

Remove Programs > AD5110 Eval Board.

RUNNING THE SOFTWARE

To run the evaluation board software, use the following steps:

1. Click Start > All Programs > Analog Devices > AD5110

>AD5110 Eval Board.

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

the software is launched, a connectivity error is displayed

(see Figure 4). Connect the evaluation board to the USB

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

the instructions.

10199-004

Figure 4. Pop-Up Window Error

The main window of the E VA L -AD5110SDZ evaluation

software then opens, as shown in Figure 5.

10199-005

Figure 5. EVAL-AD5110SDZ Evaluation Board Software Main Window

UG-322 Evaluation Board User Guide

Rev. 0 | Page 6 of 12

OPERATING THE SOFTWARE

The main window of the E VA L -AD5110SDZ software is divided

into the following sections: QUICK COMMANDS, MANUAL

DATA,RDAC, and MEMORY. The features of the main

window are as follows:

•The QUICK COMMANDSsection allows you to send

quick commands directly to the AD5110.

•The RDAC section can be used to update the RDAC

registers by typing a value into a text box and clicking

WRITE. When WRITE is clicked or a quick command

is executed, a write-read operation is performed and the

values displayed in this section are updated with the actual

RDAC register values.

•The MANUAL DATA can be used to send a customized

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. The scroll bars are updated upon each write

transfer.

•The MEMORY section displays the data stored in the

memory block. The data can be updated manually by

clicking UPDATE.

•Clicking EXIT closes the program but does not reset the part.

Evaluation Board User Guide UG-322

Rev. 0 | Page 7 of 12

EVALUATION BOARD SCHEMATICS AND ARTWORK

10199-006

Figure 6. Schematic of the AD5110 Circuitry

UG-322 Evaluation Board User Guide

Rev. 0 | Page 8 of 12

10199-007

Figure 7. Schematic of SDP Connector

Evaluation Board User Guide UG-322

Rev. 0 | Page 9 of 12

10199-008

Figure 8. Component Placement Drawing

10199-009

Figure 9. Component Side PCB Drawing

UG-322 Evaluation Board User Guide

Rev. 0 | Page 10 of 12

10199-010

Figure 10. Solder Side PCB Drawing

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