Datasheet UG-342 Datasheet (ANALOG DEVICES)

Evaluation Board User Guide

UG-342

AD5790

AD8675

INV

EXT

+10V

+5V

–5V

–10V

0V

EXT

R

FB

V

REFP

V

OUT_BUF

V

OUT

V

REFN

V

OUT

PIN HEADER (J3)

SYSTEM

DEVELOPMENT

PLATFORM BOARD

PC

USB

PORT

POWER SUPPLY INPUTS

10344-001

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

Evaluation Board for a 20-Bit Serial Input, Voltage Output DAC with Integrated

Precision Reference Buffer Amplifiers

FEATURES

Full-featured evaluation board for the AD5790
Link options
PC control in conjunction with Analog Devices, Inc., system

demonstration platform

PC software for control

EVALUATION BOARD DESCRIPTION

The E VA L -AD5790SDZ is a full-featured evaluation board,
designed to allow the user to easily evaluate all features of the

AD5790 voltage output, 20-bit digital-to-analog converter

(DAC). The AD5790 pins are accessible at on-board connectors
for external connection. The board can be controlled by two
means: via the on-board connector (J3), or via the system
demonstration platform (SDP) connector (J4). The SDP board
allows the evaluation board to be controlled through the USB
port of a Windows® XP (SP2 or later) or more recent 32-bit or
64-bit (Vista, Windows 7) PC using the AD5790 evaluation
software.

DEVICE DESCRIPTION

The AD5790 is a high precision, 20-bit DAC with integrated
precision reference buffer amplifiers designed to meet the
requirements of precision control applications. The output
range of the AD5790 is configured by two reference voltage
inputs. The device is specified to operate with a dual power
supply of up to 33 V.

Complete specifications for the AD5790 are provided in the

AD5790 data sheet, available from Analog Devices, and should

be consulted in conjunction with this user guide when using the
evaluation board.

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

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

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UG-342 Evaluation Board User Guide

TABLE OF CONTENTS

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

Evaluation Board Description......................................................... 1

Device Description ........................................................................... 1

Functional Block Diagram .............................................................. 1

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

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

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

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

REVISION HISTORY

11/11—Revision 0: Initial Version

On-Board Connectors ..................................................................3

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

Software Installation .....................................................................5

Software Operation .......................................................................5

Main Window ................................................................................6

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

Ordering Information .................................................................... 14

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

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Evaluation Board User Guide UG-342

LK6

Removed

LK7

Removed

SDO RESET

1

2

DGND CLR

3

4

DGND LDAC

5

6

SDIN DGND

7

8

SCLK SYNC

9

10

10344-015

Connector

Function

J2

Analog power supply connector

EVALUATION BOARD HARDWARE

POWER SUPPLIES

The following external supplies must be provided:

Connector J3 Pin Configuration

Figure 2 shows the pin configuration of Connector J3.

• 5 V between the V

and DGND inputs for the digital

CC

supply of the AD5790. Alternatively, place Link 1 in
Position A to power the digital circuitry from the USB
port via the SDP board (default).

• 7.5 V to 16.5 V between the V

and AGND inputs for

DD

the positive analog supply of the AD5790.

• −2.5 V to −16.5 V between the V

and AGND inputs for

SS

the negative analog supply of the AD5790.

The analog and digital planes are connected at one location,
close to the AD5790. To avoid ground loop problems, it is
recommended not to connect AGND and DGND elsewhere in
the system.

Each supply is decoupled to the relevant ground plane with
10 µF and 0.1 µF capacitors. Each device supply pin is again
decoupled with a 10 µF and 0.1 µF capacitor pair to the relevant
ground plane.

LINK OPTIONS

The link options on the evaluation board should be set for the
required operating setup before using the board. The functions
of the link options are described in Tabl e 3.

Default Link Option Setup

The default link options are listed in Table 1. By default, the
board is configured with V
a ±10 V output range.

= +10 V and V

REFP

= −10 V for

REFN

Figure 2. Connector J3 Pin Configuration

ON-BOARD CONNECTORS

There are nine connectors on the AD5790 evaluation board
PCB as outlined in Table 2.

Table 2. On-Board Connectors

J1 Digital power supply connector

J3 Digital interface pin header connector
J4 SDP board connector
VOUT DAC output connector
VOUT_BUF Buffered DAC output connector
VREF 5 V external reference voltage input connector

(+10 V, +5 V, −10 V, and −5 V reference voltages are

generated from this 5 V input or on-board ADR445)
VREFN DAC negative reference input connector
VREFP DAC positive reference input connector

Table 1. Default Link Options

Link No. Option

LK1 A
LK2 B
LK3 A
LK4 Removed
LK5 Removed

LK8 C
LK9 Inserted
LK11 Inserted

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UG-342 Evaluation Board User Guide

Position A configures the amplifier in unity gain. LK4 should be removed.1

When this link is inserted,

is at logic low.

Position A selects an on-board generated −5 V.

Table 3. Link Options

Link No. Description

LK1 This link selects the source of the digital power supply.
Position A selects the source from the SDP board.
Position B selects the source from Connector J1.
LK2 This link selects the positive reference voltage source.
Position A selects an on-board generated 5 V.
Position B selects an on-board generated 10 V.
Position C selects an external voltage applied at Connector VREFP.
LK3 This link is used in conjunction with LK4 to configure the mode of operation of the output amplifier.

Position B configures the amplifier for a gain of 2. Lk4 should be inserted.2
LK4 This link is used in conjunction with LK3 to configure the mode of operation of the output amplifier.
When this link is inserted, LK3 should be in Position B to configure the amplifier for a gain of 2.2
When this link is removed, LK3 should be in Position A to configure the amplifier for unity gain.1
LK5 This link selects the state of the
When this link is inserted,
When this link is removed,

RESET

RESET

LK6 This link selects the state of the
When this link is inserted,
When this link is removed,

is at logic low.

CLR

CLR

LK7 This link selects the state of the

LDAC

When this link is removed,

LDAC

LK8 This link selects the negative reference voltage source.

pin.

RESET

is at logic low.

is at logic high.

pin.

CLR

is at logic high.

pin.

LDAC

is at logic high.

Position B selects AGND.
Position C selects an on-board generated −10 V.
Position D selects an external voltage applied at Connec tor VREFN.
LK9 This link connects the output of Voltage Reference U5 to the reference scaling circuitry.
LK11 This link connects the DAC output to the noninverting input of the output buffer amplifier.
When this link is inserted, the DAC output is connected to the noninverting input of the output amplifier.
When this link is removed, the DAC output is disconnected from the noninverting input of the output buffer amplifier and the

DAC output voltage is accessible at the VOUT connector.

1

The RBUF bit of the control register must be set to high to enable the unity-gain mode of operation.

2

The RBUF bit of the control register must be cleared to low to enable the gain of 2 mode of operation.

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Evaluation Board User Guide UG-342

10344-002

10344-003

EVALUATION BOARD SOFTWARE

SOFTWARE INSTALLATION

The AD5790 evaluation kit includes self-installing software on
a CD. The software is compatible with Windows XP (SP2) and
Vista (32-bit or 64-bit). If the setup file does not run automati­cally, you can run the setup.exe file from the CD.

Install the evaluation software before connecting the evaluation
board and SDP board to the USB port of the PC to ensure that
the evaluation system is correctly recognized when connected
to the PC.

1. After installation from the CD is complete, power up the

AD5790 evaluation board as described in the Power Supplies
section. Connect the SDP board (via either Connector A or
Connector B) to the AD5790 evaluation board and then
to the USB port of your PC using the supplied cable.

2. When the evaluation system is detected, proceed through any

dialog boxes that appear. This completes the installation.

SOFTWARE OPERATION

To launch the software, complete the following steps:

1. From the Start menu, select Analog Devices, AD5790,

then AD5790 Evaluation Software. The main window of
the software then opens (see Figure 4).

2. If the evaluation system is not connected to the USB port

when the software is launched, a connectivity error displays
(see Figure 3). Connect the evaluation board to the USB
port of the PC, wait a few seconds, click Rescan, and follow
the instructions.

Figure 3. Connectivity Error Alert

Figure 4. Main Window

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UG-342 Evaluation Board User Guide

10344-004

10344-005

MAIN WINDOW

The main window is divided into three tabs: Configure,
Program Voltage, and Measure DAC Output.

Configure

The Configure section allows access to the control register,
clearcode register, software control register, and DAC register
and allows control of the

RESET, CLR

Program Voltage

The Program Voltage section programs the DAC register with
the value calculated from the entered values: the positive voltage
reference (VREFP), the negative voltage reference (VREFN),
and the desired output voltage (see Figure 5).

, and

LDAC

pins.

To begin the measurement, click START . The measurement can
be halted at any time by clicking STOP. When the measurement
is completed, a dialog box opens to allow you to save the data as a
spreadsheet file with three columns of data. The first column is
the DAC code, the second column is the DAC voltage in volts, and
the third column is the INL error in LSBs, as shown in Figure 6. A
graph of both the DAC output voltage vs. the DAC code and the
INL error vs. the DAC code is displayed in the Measure DAC
Output tab (see Figure 7). In the measurement example shown
in Figure 7, measurements are taken in 10000 code steps begin­ning at Code 0 and finishing at Code 1,048,575 in a total of 100
measurements. With the number of power line cycles (NPLC)
setting on the multimeter set to 1, the measurement takes ~10 sec
to complete. To complete an all codes measurement requiring
1,048,575 measurement points takes ~1 day.

Figure 5. Program Voltage Window

Measure DAC Output

The Measure DAC Output section allows the PC to control an
Agilent 3458A multimeter to measure and log the DAC output
voltage.

The multimeter is controlled over a general-purpose interface
bus (GPIB). When the multimeter is connected to the PC, first
configure the multimeter via its front panel before taking a
measurement. Figure 7 shows the measurement options. The
software runs through a sequence of steps, programming the
DAC register and measuring the DAC output voltage. The
sequence begins with the software programming the DAC with
the Start Code value, incrementing the programmed value at
each step by the Code Step value, and finishing when the pro­grammed value reaches the Stop Code value. A delay between
measurements can be inserted, if required. The GPIB address of
the multimeter must be specified.

Figure 6. Saved Data Format

If an Agilent 3458A multimeter is not connected to the PC,
the software steps through the codes without taking any
measurements.

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Evaluation Board User Guide UG-342

10344-006

Figure 7. Measure DAC Output Tab

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10344-007

EVALUATION BOARD SCHEMATICS AND ARTWORK

Figure 8. Schematic of the AD5790 Circuitry

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10344-008

Figure 9. Schematic of the Voltage Reference Circuitry

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10344-009

Figure 10. Schematic of the SDP Board Connector

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10344-010

10344-011

Figure 11. Component Placement Schematic

Figure 12. Top Printed Circuit Board (PCB) Layer Schematic

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10344-012

10344-013

Figure 13. Inner First PCB Layer Schematic

Figure 14. Inner Second PCB Layer Schematic

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10344-014

Figure 15. Bottom PCB Layer Schematic

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UG-342 Evaluation Board User Guide

ORDERING INFORMATION

BILL OF MATERIALS

Table 4.

Reference Designator Part Description Part Number Stock Code

C2, C5, C6, C10, C11, C13,
C17, C19, C20, C23, C24, C34
to C36, C40 to C42

C3, C4, C8, C9, C14, C16, C18,
C21, C22, C31, C32, C33, C37
to C39, C43

J1 2-pin terminal block (5 mm pitch)

J2 3-pin terminal block (5 mm pitch)

J3 20-pin (2 × 10) header Not applicable FEC 1022244

J4 120-way connector, 0.6 mm pitch, SDP-

L1 to L4 Ferrite bead IND 74279204 FEC 1635719
LK1, LK3 3-pin SIL header and shorting link M20-9990345 and M7567-05 FEC 1022248 and 150410
LK2 6-pin (3 × 2) 0.1" header and shorting block M20-9983646 and M7566-05 FEC 148-535 and 150-411

LK4 to LK7, LK9, LK11 2-pin (0.1" pitch) header and shorting shunt M20-9990246 FEC 1022247 and 150-411
LK8 8-pin (4 × 2) 0.1" header and shorting block M20-9983646 and M7566-05 FEC 1022244 and 150-411

R1 to R12 SMD resistor MC 0.063W 0603 10k FEC 9331700
R13, R15, R17, R19, R20 Resistor, 1 kΩ, 0805, 5 ppm PCF0805-13-1K-B-T1 FEC 31108863
R16 Resistor, 2 kΩ, 0805, 5 ppm PCF0805-13-2K-B-T1 FEC 1108872
R18 Resistor, 0805, 680 Ω MC 0.1W 0805 5% 680R FEC 9334785
R21 Resistor, 0805, 510 Ω MC 0.1W 0805 5% 510R FEC 9334637
R22 Resistor, 0805, 1.5 kΩ MC 0.1W 0805 5% 1K5 FEC 9333924
TP1 to TP7 Red test point 20-2137 FEC 240-333
U1 20-bit DAC AD5790BCPZ AD5790BCPZ
U2, U6 Single op amp AD8675ARZ AD8675ARZ
U8, U9 Dual op amp AD8676BRZ AD8676BRZ
U4 64k I2C serial EEPROM 24LC64-ISN FEC 9758070
U5 5 V reference ADR445BRZ ADR445BRZ
VOUT, VOUT_BUF, VREF,

VREFN, VREFP

Capacitor, 0603, 0.1 µF, 16 V CM105X7R104K16AT FEC 9406140

Capacitor +, 10 µF, 16 V, 10%, Case B TAJB106K016R FEC 498737

CTB5000/2 FEC 151789

CON\POWER

CTB5000/3 FEC 151790

CON\POWER3

(36 + 36-pin strip)

FX8-120S-SV(21) FEC 1324660

STANDARD-CONN

(36-pin strip)

(36-pin strip)

Straight PCB mount SMB jack, 50 Ω 1-1337482-0 FEC 1206013

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Evaluation Board User Guide UG-342

NOTES

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UG-342 Evaluation Board User Guide

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

NOTES

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 forth 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 Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, I nc.
(“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. S ubject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,
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. Further more, the license granted is expressly made subject 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. Thi s Agreement and the Evaluati on 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 AN Y KIND WITH RESPECT TO IT. ADI SPECIFICA LLY DIS CLAIMS ANY REPRESENTATIONS, ENDORSEMENTS , GUARANTEES, OR WARRANTIES, EXPRES S 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 ALL 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 LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of
Massachusetts (excluding conflict of law rules). Any legal action regarding this Ag reement will be 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 no t apply to this Agreement and is exp ressly disclaimed.

©2011 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG10344-0-11/11(0)

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