Datasheet UG-322 Datasheet (ANALOG DEVICES)

Evaluation Board User Guide

UG-322

10199-001

One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: [phone] • Fax: [phone] • www.analog.com

Evaluation Board for the AD5110 Digital Potentiometer

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 I
of the wiper register and EEPROM content which contain the
resistor tolerance, providing an end-to-end tolerance accuracy
of 0.1%.

The EVA 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.

2

C-compatible digital interface allows readback

DIGITAL PICTURE OF EVALUATION BOARD WITH SYSTEM DEMONSTRATION PLATFORM

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.

Figure 1.

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UG-322 Evaluation Board User Guide

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

REVISION HISTORY

11/11—Revision 0: Initial Version

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

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Evaluation Board User Guide UG-322

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 Ta ble 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 Tabl e 2.

All supplies are decoupled to ground using 10 µF tantalum and

0.1 µF ceramic capacitors.

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, V
If connected to the SDP board, V
If controlled externally, V
VLOGIC_EXT-2 VLOGIC_EXT − Logic ground, DGND.

LINK OPTIONS

Several link and switch options are incorporated in the evalu­ation board and should be set up before using the board. Tabl e 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 Tabl e 3.

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

Link No. Option
LK2 3V3
LK8 +5V

.

LOGIC

is 3.3 V.

LOGI C

is 1.8 V to VDD.

LOGIC

Table 3. Link Functions

Link Number Power Supply Option

LK2 V
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).

1

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

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

LOGIC

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UG-322 Evaluation Board User Guide

VOUT

V

DD

AC
DC

GND

A

B

W

BUF-W

+

–

W

AC

V

DD

2

V

DD

2

B

A

750Ω

12Ω

R9

R8

10199-002

256

)(

RDAC

VVV

B

A

OUT

×−=

B

A

AC

AC

GND

A

B

W

BUF-W

AC_INPUT

W

VOUT

+

–

V

DD

2

V

DD

2

HPF

f

C

= 200Hz

12Ω

750Ω

R8

R9

R7

10199-003










×≈

128

log20)dB(

RDAC

nAttenuatio

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.

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.

Figure 2. DAC

Tabl e 4 shows the options available for the voltage references.

Table 4. DAC Voltage References

Termi nal 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.

(1)

where:

RDAC is the code loaded in the RDAC register.
V

is the voltage applied to Terminal A (LK1 link).

A

V

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

B

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 V

and VB in Equation 1.

A

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 Tabl e 5.

Table 5. AC Signal Attenuation Link Options

Termi nal Link Options Description

A LK1 AC Remove dc voltage and biased

the signal to V

/2

DD

W BUF-W Connects Terminal W to an

output buffer
B LK6 AC1 Connects Terminal B to VDD/2
GND Connects Terminal B to analog

ground

1

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

The signal attenuation is defined in Equation 2.

(2)

where:
RDAC is the code loaded in the RDAC register.

In addition, R7 can be used to achieve an exponential attenua­tion. To do so, adjust the R7 resistor until a desirable transfer
function is found, typically around 1.6 kΩ for a 10 kΩ
potentiometer.

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Evaluation Board User Guide UG-322

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10199-005

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. Pl u g t h e 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.

Figure 4. Pop-Up Window Error

The main window of the EVA L -AD5110SDZ evaluation
software then opens, as shown in Figure 5.

Figure 5. EVAL-AD5110SDZ Evaluation Board Software Main Window

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UG-322 Evaluation Board User Guide

OPERATING THE SOFTWARE

The main window of the EVA 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 COMMANDS section 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

2

I

C 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
tr ans fer.

• 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.

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Evaluation Board User Guide UG-322

EVALUATION BOARD SCHEMATICS AND ARTWORK

Figure 6. Schematic of the AD5110 Circuitry

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UG-322 Evaluation Board User Guide

10199-007

Figure 7. Schematic of SDP Connector

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Evaluation Board User Guide UG-322

10199-008

10199-009

Figure 8. Component Placement Drawing

Figure 9. Component Side PCB Drawing

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UG-322 Evaluation Board User Guide

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Figure 10. Solder Side PCB Drawing

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Evaluation Board User Guide UG-322

2

DGND, AGND

Test point, PCB, black, PK100

FEC 873-1128

1

U7

24LC64 serial EEPROM

FEC 9758070

ORDERING INFORMATION

BILL OF MATERIALS

Table 6.

Qty Reference Designator Description Supplier1/Part Number

1 C3 100 nF, 0402 capacitor FEC 1414580
2 C1,C2 0.1 µF, 0603 capacitor FEC 138-2224
4 C25, C26, C27, C34 0.1 µF, 0603 capacitor FEC 301-9482
2 C24, C33 10 µF, 1206 capacitor FEC 197-130
1 D1 Green LED FEC 579-0852
2 VLOGIC_EXT, EXTERNAL 2-pin connector FEC 151789
1 J4 Receptacle, 0.6 mm, 120 way Digi-Key H1219-ND
8

LK1, LK2, LK3, LK4, LK5, LK6, LK8,
1 BUF-W Header, 1-row, 2-way, and jumper socket, black FEC 102-2247 and FEC 150-411
1 R11 12 Ω, 0603, 1% resistor FEC 9330534
1 R10 750 Ω, 0603, 1% resistor FEC 9331506
1 R4 1 kΩ, 0603, 0.01% resistor FEC 9330380

4 R5, R6, R12, R13 2.7 kΩ, 1206, 1% resistor FEC 9337288
2 R8, R9 0 Ω, 0603 resistor FEC 9331662

7 3V3, A, B, VDD, VLOGIC, VOUT, W Test point, PCB, red, PK100 FEC 873-1144
1 U1 AD5110 Analog Devices AD5110
1 U3 ADA4860 Analog Devices ADA4860
1 U5 ADP3303 Analog Devices ADP3303

Header, 2-row, 36 + 36 way, and jumper socket, black FEC 148-535 and FEC 150-411

ASE

1 U15 AD8652 Analog Devices AD8652

1

FEC refers to Farnell Electronic Component Distributors.

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UG-322 Evaluation Board User Guide

and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,

neer chips on the Evaluation Board. Customer shall inform ADI of any

LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of

NOTES

I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).

ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection

circuitry, damage may occur on devices subjected to high e nergy ESD. Therefore, proper ESD precaution s should be taken to avoid per formance degradation or loss of functionality.

Legal Terms and Conditions

By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms a nd conditions
set for th below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you
have read and agreed to the Agreement . Your use of the Ev aluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer ”) and Analog Devices, Inc.
(“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms
temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided
for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made sub ject to the following additional
limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term
“Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including
ownership of t he Evaluation Board, are res erved by ADI. CONFIDENTIA LITY. This Agreement and t he Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may
not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to
promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engi
occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board.
Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice
to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO
WARRANTIES OR REPRES ENTATIONS OF ANY KIND WITH RESPEC T TO IT. ADI SPECIFICAL LY DISCLAIMS ANY REPRES ENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED
TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL
PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF
THE EVALUATION BOARD, INCLUD ING BUT NOT LIMITED TO LOST PROFITS, DE LAY COSTS, LABOR COSTS OR LOSS OF GOODWI LL. ADI’S TOTAL LIABILIT Y FROM ANY AND A LL CAUSES SHALL BE LIMITED TO THE
AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable
United States federal laws and regulations relating to exports. GOVERNING
Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will b e heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby
submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expre ssly disclaimed.

©2011 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG10199-0-11/11(0)

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