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AD97

88/87/85

Evaluation Board

Quick Start Guide

One

Technology

Way

•

P.O.

Box

9106

•

Norwood,

02062-9106,

U.S.A.

•

Tel:

781.329.4700

•

Fax:

781.461.3113

•

www.analog.com

Getting Started with the AD9788/87/85 Evaluation Board

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

WHAT’S IN THE BOX

AD978x-DPG2-EBZ Evaluation Board

Mini-USB Cable

AD9788 Evaluation Board CD

EXAMPLE

EQUIPMENT LIST

+5Vdc Power Supply: Agilent E3630A

Digital Pattern Generator (DPG2): ADI HSC-DAC-DPG-BZ

DAC Clock Source: R&S SML 02

AQM LO Clock Source: R&S SMA100A

Spectrum Analyzer: Agilent PSAA or R&S FSU

PC: Windows PC with 2 or more USB ports (See Appendix for

system requirements)

INTRODUCTION

The AD9788/87/85 Evaluation Boards (model AD978x-DPG2–EBZ) connect directly to the Analog Devices Digital Pattern Generator 2

(DPG2) to allow for quick evaluation of the AD9788 family of DACs. The DPG2 allows the user to create many types of digital vectors

and transmit these at speed to the AD9788 in any of the DAC operating modes. The AD9788 evaluation board is configured over USB

with accompanying PC software. The evaluation board includes the ADL5375 quadrature modulator and the AD9516 clock chip so the

board can be configured as a transmit chain in addition to evaluating the DAC as a standalone part. The AD9516 can be used to compare

the on chip PLL performance to the AD9516 clock multiplication performance in terms of jitter or phase noise.

SOFTWARE INSTALLATION

The AD9788 application software should be installed on the PC prior connecting the hardware to the PC. The DAC Software Suite is

included on the Evaluation Board CD, or can be downloaded from the DPG web site at http://www.analog.com/dpg. This will install

DPGDownloader (for loading vectors into the DPG2) and the AD9788 SPI application.

Summary of content (9 pages)

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AD9788/87/85 Evaluation Board One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.
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Quick Start Guide AD9788/87/85-DPG2-EBZ HARDWARE SETUP (DAC OUTPUT) Once the DPGDownloader software is installed, the hardware can be connected as shown in Figure 1. A single 5V power supply powers the evaluation board. The power supply should be able to source up to 2A to cover all of the board’s operating conditions. A low jitter clock source (< 0.5ps RMS) should be used for the DACCLK. A sinusoidal clock output level of 0dBm to +4dBm is optimal.
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Quick Start Guide AD9788/87/85-DPG2-EBZ Figure 5 – DPGDownloader Window - If the AD978x evaluation board has been recognized by the PC, AD978x should be populated in the Evaluation Board field in the Hardware Config panel. - Generate a sine wave by pulling down the “Add Generated Waveform” menu and choosing “Single Tone”. Fill in the form as shown in (Sample Rate = 50MHz, Desired Frequency = 10 MHz, etc.). Check the “Generate Complex Data (I&Q)” box.
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Quick Start Guide AD9788/87/85-DPG2-EBZ Figure 6 AD9788 SPI VI Panel control - When the Run button is clicked, the SPI controller will run once. It will both write and read from the AD9788. The Run Forever control will setup the AD9788, and will continue to read from the chip and will update the SPI when any of the controls change. - The DCO frequency field in the DPGDownloader window should now be reading something close to 200MHz.
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Quick Start Guide AD9788/87/85-DPG2-EBZ Figure 7 I DAC Output Signal Screenshot Selecting the Modulator Outputs By default, solder jumpers JP1, JP2, JP3, and JP4 configure the evaluation board for the DAC outputs to be observed at SMA J4 for IDAC and J8 for QDAC. This jumper setting is shown in 8 a). To connect to the filter that feed ADL5375 the solder jumpers need to be repositioned as shown in 8 b). The output from the ADL5375 Modulator can be observed SMA J6, RF out.
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Quick Start Guide AD9788/87/85-DPG2-EBZ AD9788 SPI Application The SPI application is split into several sections. These sections control the different features of the AD9788 but can be left in the default positions if you are not using the features i.e. internal PLL, multi chip sync, aux DACs . Several of the functions provided by the SPI application are described here, as they relate to the evaluation board. For complete descriptions of each register, refer to the AD9788 datasheet.
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Quick Start Guide AD9788/87/85-DPG2-EBZ Figure 9 AD9788 Evaluation Board Using the AD9516 The AD9516 is included so you can test the performance i.e. ACLR with the AD9516 clock multiplication. In order to drive the DAC Clock from AD9516 the jumper J5 and J6 needs to be changed shown in figure 10 a and 10 b. You also need to start up the AD9516 SPI VI that is included in the CD software. First type in your Ref frequency, example in Figure 11 is 122.88 MHz.
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Quick Start Guide AD9788/87/85-DPG2-EBZ Figure 10 – a) DAC CLK Input configuration Figure 11 AD9516 SPI Control ©2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
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Quick Start Guide AD9788/87/85-DPG2-EBZ Appendix A – DPGDownloader Notes Detailed documentation for the DPGDownloader Software and the Full DPG Suite can be accessed thru the Help Pull-down menu. Also available from the Help pull-down menu is a shortcut for checking to see if there is a more recent DPGDownloader version available with an option to automatically update the software. ©2010 Analog Devices, Inc. All rights reserved.