Analog Devices EVAL-AD5161DBZ Manuale utente

EVAL-AD5161DBZ User Guide

UG-624

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 AD5161 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-AD5161DBZ 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 AD5161 data sheet

Electronic version of the EVAL-AD5161DBZuser guide

GENERAL DESCRIPTION

This user guide describes the evaluation boards for evaluating the

AD5161, a 256-position SPI-/I2C-selectable digital potentiometer.

The AD5161 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 AD5161 has a pin-selectable SPI- or I2C-

compatible digital interface, which can be used to control the

wiper settings or to read back the wiper register content. In SPI

mode, the device can be daisy-chained (SDO to SDI), allowing

several parts to share the same control lines. In I2C mode,

Address Pin AD0 can be used to place up to two devices on the

same bus. In this same mode, command bits are available to reset

the wiper position to midscale or to shut down the device into a

state of zero power consumption.

The E VA L -AD5161DBZ 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 AD5161 can be found in the

AD5161 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-AD5161DBZ WITH MOTHERBOARD AND SDP-B

11876-001

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

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UG-624 EVAL-AD5161DBZ User Guide

Rev. 0 | Page 2 of 16

TABLE OF CONTENTS

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

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

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

Photograph of EVAL-AD5161DBZ with Motherboard

and SDP-B.......................................................................................... 1

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

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

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

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

Digital Interface ............................................................................ 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

12/13—Revision 0: Initial Version

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EVAL-AD5161DBZ User Guide UG-624

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 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 -AD5161DBZ 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 6.

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

PC via the SDP board.

DIGITAL INTERFACE

The E VA L -AD5161DBZ can be configured as an I2C or SPI

digital interface, depending on the position of the P9 jumper. If

the device is configured in I2C mode, the P10 jumper selects the

I2C address. See Table 3 for further details.

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

LOGIC

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

Table 3. Digital Interface Link Functions

Link No. Options Default Position

P9 Digital interface select options: SPI

SPI (use SPI digital interface).

I2C (use I2C digital interface).

P10 Chip select options (I2C mode only): Left

Left side: address pin is connected to AGND.

Right side: address pin is connected to VLOGIC.

This jumper is unused in SPI mode.

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UG-624 EVAL-AD5161DBZ User Guide

Rev. 0 | Page 4 of 16

TEST CIRCUITS

The E VA L -AD5161DBZ and E VA L -MB-LV-SDZ incorporate

several test circuits to evaluate the performance of the AD5161.

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

11876-002

Figure 2. DAC

Table 5 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

11876-003

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 4.

Table 4. 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.











+

×=

−− ENDTO

END

WWB

nAttenuatio 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 5. 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

B1 P7: B1 position A10: BIAS position Connects Terminal B1 to VDD/2

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-AD5161DBZ User Guide UG-624

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 6 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

RDAC

R42

10nF

W B

R41

1.7kΩ

R38

2.7kΩ

11876-004

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

A B

R41

1.7kΩ

R43

11876-005

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 resistor between the W and B terminals.

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

11876-006

VOUT2

RDAC

R42

10nF

W B

R41

1.7kΩ

R38

2.7kΩ

NOTES

1. THE INPUT SIGNAL, V

, MUST BE NEGATIVE.

Figure 6. Inverting Amplifier with Linear Gain

Table 6. 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-624 EVAL-AD5161DBZ User Guide

Rev. 0 | Page 6 of 16

EVALUATION BOARD SOFTWARE

INSTALLING THE SOFTWARE

The E VA L -AD5161DBZ 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 -AD5161DBZ 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 > AD5161

> AD5161 Eval Board. (To uninstall the program, click

Start > Control Panel > Add or Remove Programs >

AD5161 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.

11876-007

Figure 7. Pop-Up Window Error

The main window of the E VA L -AD5161DBZ software then

opens, as shown in Figure 8.

11876-008

Figure 8. EVAL-AD5161DBZ Software Main Window, Visual Control Tab

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EVAL-AD5161DBZ User Guide UG-624

Rev. 0 | Page 7 of 16

OPERATING THE SOFTWARE

The main window of the E VA L -AD5161DBZ 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 to be

written to or read from the device. To write data to the device, type

a hexadecimal value into the Data to write box and click Wr ite .

To read data from the device, click Read; the data is displayed

in hexadecimal format in the Data read box. A slider control,

located on the right side of the window, allows changing the

wiper setting.

Manual Control Tab

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

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

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

I2C Write or SPI Write/Read. Similarly, data can also be read

from either I2C or SPI using the corresponding controls.

The I2C Data Written or SPI Data Written box shows the

value that is written to the evaluation board. It is set using the

sliders in the I2C – Wr ite or SPI – Write / Read section.

Exiting the window closes the program.

11876-009

Figure 9. EVAL-AD5161DBZ Software Main Window, Manual Control Tab

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UG-624 EVAL-AD5161DBZ User Guide

Rev. 0 | Page 8 of 16

EVALUATION BOARD SCHEMATICS AND ARTWORK

MOTHERBOARD

11876-010

Figure 10. SDP Connector and Power Supply

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EVAL-AD5161DBZ User Guide UG-624

Rev. 0 | Page 9 of 16

11876-011

Figure 11. Schematic of Test Circuits

UG-624 EVAL-AD5161DBZ User Guide

Rev. 0 | Page 10 of 16

11876-012

Figure 12. Schematic of Connectors to Daughter Board

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