Analog Devices EVAL-AD5781 User Manual
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Analog Devices EVAL-AD5781 User Manual

Analog Devices EVAL-AD5781 User Manual

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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 a 18-Bit Serial Input, Voltage Output DAC

FEATURES

Full-featured evaluation board for the AD5781
Link options
PC control in conjunction with Analog Devices, Inc., system
development platform
PC software for control

EVALUATION BOARD DESCRIPTION

The EVAL-AD5781 is a full-featured evaluation board, designed
to allow the user to easily evaluate all features of the
voltage output, 18-bit DAC. The AD5781 pins are accessible at
on-board connectors for external connection. The board can be
controlled by two means, via the on-board connector (J6) or via
the system development platform connector (J3). The SDP
board allows the evaluation board to be controlled through the
USB port of a Windows® XP (SP2 or later) or Vista (32-bit)
based PC using the AD5781 evaluation software.
SYSTEM DEVELOPMENT
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
AD5781

FUNCTIONAL BLOCK DIAGRAM

PC
USB
PORT
PLATFORM BOARD
PIN HEADER (J6)

Evaluation Board User Guide

DEVICE DESCRIPTION

The AD5781 is a high precision, 18-bit digital-to-analog con-
verter (DAC), designed to meet the requirements of precision
control applications. The output range of the AD5781 is confi-
gured 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 AD5781 are available in the
AD5781 data sheet available from Analog Devices and should
be consulted in conjunction with this user guide when using the
evaluation board.
POWER SUPPLY INPUTS
POSITIVE
REFERENCE
AD5781
NEGATIVE
REFERENCE
Figure 1.
Rev. 0 | Page 1 of 16
UG-184
V
OUT

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Summary of Contents for Analog Devices EVAL-AD5781

  • Page 1: Features

    Full-featured evaluation board for the AD5781 Link options verter (DAC), designed to meet the requirements of precision PC control in conjunction with Analog Devices, Inc., system control applications. The output range of the AD5781 is confi- development platform gured by two reference voltage inputs. The device is specified to PC software for control operate with a dual power supply of up to 33 V.

  • Page 2: Table Of Contents

    UG-184 Evaluation Board User Guide TABLE OF CONTENTS Features ....................1 Evaluation Board Software ...............5 Evaluation Board Description ............1 Software Installation ..............5 Device Description ................1 Software Operation ...............5 Functional Block Diagram .............. 1 Main Window ................6 Revision History ................2 Evaluation Board Performance ............8 Evaluation Board Hardware ............

  • Page 3: Evaluation Board Hardware

    Evaluation Board User Guide UG-184 EVALUATION BOARD HARDWARE POWER SUPPLIES Connector J6 Pin Descriptions The following external supplies must be provided: Table 2. Connector J6 Pin Configuration • 5 V between the V and DGND inputs for the digital supply of the AD5781. Alternatively, place Link 1 in Position A to power the digital circuitry from the USB port (default).
  • Page 4 UG-184 Evaluation Board User Guide Table 5. Link Options Link No. Description 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 J2. This link selects the voltage source for the IOV pin.

  • Page 5: Evaluation Board Software

    CD. The software is compatible with Windows XP (SP2) and From the Start menu, select Analog Devices – AD5781 > Vista (32-bit). If the setup file does not run automatically, you AD5781 Evaluation Software. The main window of the can run setup.exe from the CD.

  • Page 6: Main Window

    UG-184 Evaluation Board User Guide MAIN WINDOW To begin the measurement, click the START button. The measurement can be halted at anytime by clicking the STOP The main window is divided into three tabs: Configure, button. When the measurement is completed, a dialog box Program Voltage, and Measure DAC Output.
  • Page 7 Evaluation Board User Guide UG-184 Figure 6. Measure DAC Output Window Rev. 0 | Page 7 of 16...

  • Page 8: Evaluation Board Performance

    UG-184 Evaluation Board User Guide EVALUATION BOARD PERFORMANCE The following data demonstrates the measured linearity performance of the AD5781 evaluation board circuit. The board is powered from = +15 V, V = −15 V, and V = +5 V. –0.1 –0.2 –0.3 –0.4...

  • Page 9: Evaluation Board Schematics And Artwork

    Evaluation Board User Guide UG-184 EVALUATION BOARD SCHEMATICS AND ARTWORK Figure 9. Schematic of the AD5781 Circuitry Rev. 0 | Page 9 of 16...
  • Page 10 UG-184 Evaluation Board User Guide Figure 10. Schematic of the Voltage Reference Scaling Circuitry Rev. 0 | Page 10 of 16...
  • Page 11 Evaluation Board User Guide UG-184 Figure 11. Schematic of the SDP Board Connector Rev. 0 | Page 11 of 16...
  • Page 12 UG-184 Evaluation Board User Guide Figure 12. Component Placement Schematic Figure 13. Top PCB Layer Schematic Rev. 0 | Page 12 of 16...
  • Page 13 Evaluation Board User Guide UG-184 Figure 14. Inner First PCB Layer Schematic Figure 15. Inner Second PCB Layer Schematic Rev. 0 | Page 13 of 16...
  • Page 14 UG-184 Evaluation Board User Guide Figure 16. Bottom PCB Layer Schematic Rev. 0 | Page 14 of 16...

  • Page 15: Ordering Information

    Evaluation Board User Guide UG-184 ORDERING INFORMATION BILL OF MATERIALS Table 6. Reference Designator Part Description Part Number Stock Code C1, C2, C9, C11, C12, C16, Capacitor, 10 μF, 16 V, 10%, Case B TAJB106K016R FEC 498737 C17, C20, C41, C42, C48, C54, C95, C96, C98, C99, C102, C103 C3, C4, C5, C6, C7, C8, C10,...
  • Page 16 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 and 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.

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