Analog Devices EVAL-AD5165DBZ Manuale utente

EVAL-AD5165DBZ User Guide

UG-629

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 AD5165 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 evaluation board used in conjunction with

low voltage digiPOT motherboard (EVAL-MB-LV-SDZ)

Multiple test circuits

Multiple ac/dc input signals

PC control via a separately purchased system demonstration

platform (SDP-B or SDP-S)

PC software for control

EVALUATION KIT CONTENTS

EVAL-AD5165DBZ evaluation 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 AD5165 data sheet

Electronic version of the EVAL-AD5165DBZ user guide

GENERAL DESCRIPTION

This user guide describes the evaluation boards for evaluating the

AD5165, a single-channel, 256-position, ultralow power, 1.8 V

logic level digital potentiometer.

The AD5165 supports single-supply 2.7 V to 5.5 V operation,

making the device suitable for battery-powered applications and

many applications requiring superior low temperature coefficient

performance.

In addition, the AD5165 uses an SPI-compatible digital interface

to vary the wiper setting. The resistance between the wiper and

either end point of the fixed resistor varies linearly with respect to

the digital code transferred into the RDAC latch.

The E VA L -AD5165DBZ daughter board and the E VA L -MB-

LV-SDZ motherboard can operate in single-supply mode and

incorporate an internal power supply from the USB.

Complete specifications for the AD5165 can be found in the

AD5165 data sheet, which is available from www.analog.com

and should be consulted in conjunction with this user guide

when using the evaluation board.

PHOTOGRAPH OF EVAL-AD5165DBZ WITH MOTHERBOARD AND SDP-B

11881-001

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

Downloaded from Arrow.com.

UG-629 EVAL-AD5165DBZ User Guide

Rev. 0 | Page 2 of 16

TABLE OF CONTENTS

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

Evaluation Kit Contents................................................................... 1

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

Photograph of EVAL-AD5165DBZ 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

Evaluation Board Schematics and Artwork...................................8

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

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

Bill of Materials............................................................................... 14

REVISION HISTORY

2/14—Revision 0: Initial Version

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EVAL-AD5165DBZ User Guide UG-629

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.

LINK OPTIONS

Several link and switch options are incorporated on the EVAL-

MB-LV-SDZ and E VA L -AD5165DBZ boards and must be set

up before using the evaluation system. The functions of these

link options are described in detail in Table 2 through Table 5.

By default, the evaluation system is set up to be controlled by a

PC via the SDP board.

Table 1. Connector Functions

Voltage

Connector No. Label Description Min Max

J1-1 VDD Analog positive power supply, VDD 2.7 V 5.5 V

J1-2 AGND Analog ground

J2-1 VLOGIC Digital supply 2.7 V VDD

J2-2 DGND Digital ground

Table 2. Link Functions

Link No. Power Supply Options Default Position

A5 VLOGIC Digital supply select options: 3.3 V

3.3 V (from the SDP board)

VLOGIC EXT (external supply from the J2 connector)

A11 VDD Positive power supply select options: 3.3 V

5 V (from the SDP board)

3.3 V (from the SDP board)

VDD (external supply from the J1 connector)

A12 GND AGND AGND

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UG-629 EVAL-AD5165DBZ User Guide

Rev. 0 | Page 4 of 16

TEST CIRCUITS

The E VA L -AD5165DBZ and E VA L -MB-LV-SDZ incorporate

several test circuits to evaluate the performance of the AD5165.

DAC

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

(DAC), as shown in Figure 2.

VOUT1

R34

R35

RDAC

VDD

AC+

VDD

2AGND

BIAS

BUF-W1

11881-002

Figure 2. DAC

Table 4 shows the options available for the voltage references.

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 the A terminal (A9 link).

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

However, by using the R34 and R35 external resistors, you 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 recalculate VAand VBin Equation 1.

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.

VOUT1

R34

R35

RDAC

AC+

AGND

BIAS

BUF-W1

AC_INPUT

1kHz

HPF

VDD

11881-003

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 3.

Table 3. 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/2.1

AC All other conditions.

A10 BIAS Use in conjunction with AC+ link.1

AGND All other conditions.

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

The signal attenuation is defined in Equation 2.











+

×=

−− ENDTOEND

WWB

Attenuatio log20)dB(

(2)

where:

RWB is the resistance between the W and B terminals.

RWis the wiper resistance.

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

Table 4. DAC Voltage References

Link Settings

Terminal

Daughter Board

Motherboard

Description

A1 P5: A1 position A9: AC+ position Connects Terminal A1 to VDD/2

A9: VDD position Connects Terminal A1 to VDD

W1 P6: W1 position BUF-W1: inserted Connects Terminal W1 to an output buffer

P7: B1 position

A10: BIAS position

Connects Terminal B1 to V

A10: AGND position Connects Terminal B1 to analog ground

P8: inserted Closes the feedback loop of the second op amp in the AD8618

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EVAL-AD5165DBZ User Guide UG-629

Rev. 0 | Page 5 of 16

Signal Amplifier

The RDAC can be operated as an inverting or noninverting

signal amplifier and can support linear or pseudologarithmic

gain. 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

(3)

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

VOUT2

VIN

RDAC

R42

10nF

R41

1.7kΩ

R38

2.7kΩ

11881-004

Figure 4. Noninverting Amplifier with Linear Gain

The noninverting amplifier with pseudologarithmic gain is

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

G+=1

(4)

where:

RWB is the resistance between the W and B terminals.

RAW is the resistance between the A and W terminals.

VOUT2

RDAC

R42

10nF

R41

1.7kΩ

R43

11881-005

Figure 5. Noninverting Amplifier with Pseudologarithmic Gain

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.

R38

GWB

−=

(5)

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

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

VOUT2

NOTES

1. THE INPUT SIGNAL, V

, MUST BE NEGATIVE.

RDAC

R42

10nF

W B

R41

1.7kΩ

R38

2.7kΩ

11881-006

Figure 6. Inverting Amplifier with Linear Gain

Table 5. Amplifier Selection Link Settings

Link Settings

Amplifier Gain Daughter Board Motherboard VIN Range

Noninverting Linear P5: A2 position, A7: LIN position, 0 V to VDD

P6: W2 position, A6: N-INV position,

P7: B2 position, A8: N-INV position

P8: not inserted

Pseudologarithmic P5: A2 position, A7: LOG position, 0 V to VDD

P6: W2 position, A6: N-INV position,

P7: B2 position, A8: N-INV position

P8: not inserted

Inverting Linear P5: A2 position, A7: LIN position, −VDD to 0 V

P6: W2 position, A6: INV position,

P7: B2 position, A8: INV position

P8: not inserted

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UG-629 EVAL-AD5165DBZ User Guide

Rev. 0 | Page 6 of 16

EVALUATION BOARD SOFTWARE

INSTALLING THE SOFTWARE

The E VA L -AD5165DBZ kit includes evaluation board software

provided on a CD. The software is compatible with Windows® X P,

Windows Vista, and Windows 7 (both 32-bit and 64-bit versions).

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 complete, power up the evaluation

board as described in the Power Supplies section.

4. Connect the E VA L -AD5165DBZ and E VA L -MB-LV-SDZ to

the SDP board and the SDP board to the PC.

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

instructions that appear to finalize the installation.

RUNNING THE SOFTWARE

To run the program, do the following:

1. Click Start > All Programs > Analog Devices > AD5165

> AD5165 Eval Board. (To uninstall the program, click

Start > Control Panel > Add or Remove Programs >

AD5165 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 7). If a connectivity error is displayed, connect the

evaluation board to the USB port of the PC and wait a few

seconds, and then click Rescan and follow the instructions

that appear on-screen.

11881-007

Figure 7. Pop-Up Window Error

The main window of the E VA L -AD5165DBZ software then

opens, as shown in Figure 8.

11881-008

Figure 8. EVAL-AD5165DBZ Software Main Window, Visual Control Tab

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EVAL-AD5165DBZ User Guide UG-629

Rev. 0 | Page 7 of 16

OPERATING THE SOFTWARE

The main window of the E VA L -AD5165DBZ software is

divided into two tabs: Visual Control and Manual Control.

Visual Control Tab

The Visual Control tab, as shown in Figure 8, contains a block

diagram that allows inputting data in hexadecimal format in the

Data to write box. Click Write to write the data to the device

window, allows changing the wiper setting.

Manual Control Tab

The Manual Control tab, as shown in Figure 9, allows customizing

an I2C data-word by manually switching each serial data-word

(D7 to D0) from 0 to 1 or from 1 to 0, as desired, and then

clicking Wr ite.

The Data Written box shows the value that is written to the

evaluation board. It is set using the D0 to D7 sliders in the

Serial Data Word section.

Exiting the window closes the program.

11881-009

Figure 9. EVAL-AD5165DBZ Software Main Window, Manual Control Tab

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UG-629 EVAL-AD5165DBZ User Guide

Rev. 0 | Page 8 of 16

EVALUATION BOARD SCHEMATICS AND ARTWORK

MOTHERBOARD

11881-010

Figure 10. SDP Connector and Power Supply

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EVAL-AD5165DBZ User Guide UG-629

Rev. 0 | Page 9 of 16

11881-011

Figure 11. Schematic of Test Circuits

UG-629 EVAL-AD5165DBZ User Guide

Rev. 0 | Page 10 of 16

11881-012

Figure 12. Schematic of Connectors to Daughter Board

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