Analog Devices AD9783 Manual de usuario

AD9783/81/80

Evaluation Board

Quick Start Guide

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

Getting Started with the AD9783/81/80 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.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

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

AD9783-DPG2-EBZ Evaluation Board

Mini-USB Cable

AD9783 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, PXA or R&S FSU

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

system requirements)

INTRODUCTION

The AD9783,1,80 Evaluation Boards (model AD978x-DPG2–EBZ) connect directly to the Analog Devices Digital Pattern

Generator 2 (DPG2) to allow for quick evaluation of the AD9783 family of DACs. The DPG2 allows the user to create many types

of digital vectors and transmit these at speed to the AD9783 in any of the DAC operating modes. The AD9783 evaluation board is

configured over USB with accompanying PC software. The evaluation board includes the ADL5375 quadrature modulator and the

ADCLK905 clock buffer so the board can be configured as a transmit chain in addition to evaluating the DAC as a standalone part.

SOFTWARE INSTALLATION

The AD9783 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 AD9783 SPI Controller application.

Quick Start Guide

AD9783/81/80-DPG2-EBZ

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D00000-0-1/07(A)

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 600mA to cover all of the board’s operating

conditions. A low jitter clock source (< 0.5psec RMS) should be used for the DAC sampling clock CLKP/N. A sinusoidal clock

output level of 0 to 4dBm is optimal. By default, the DAC outputs are connected to SMA’s J5,7,8,9. The modifications required

for observing the Modulator output will be explained. The evaluation board plugs directly into the DPG2. The PC connects to

both the DPG2 and the evaluation board through USB cables.

Figure 1- Bench Set-Up

Figure 2- DPG2 and AD9783 Evaluation Board

GETTING STARTED –SINGLE TONE TEST

It is suggested that the basic set-up is verified before making any modifications to the evaluation board.

Basic Hardware Set-Up

Connect the equipment to the AD9783 evaluation board per the following table:

Equipment

Connects to AD978x Eval Board

Power Supply

P4 (+5V), P5 (GND)

Signal Source Clk

J1 ( CLKP/N), Set source to 300MHz, 3dBm output

Signal Source LO

J2 ( LO IN), Set source to desired LO (i.e. 900 or 1800 MHz, 3dBm output when using

the

ADL5375 to mix up to the antenna frequency. J6 is the modulator output.

PC USB Cable

XP2

Spectrum Analyzer

J5 (OUT1P) or J9(OUT2P)

DPG2

P1 and P2

DPGDownloader Software

Power up the DPG and connect the USB cable to the PC. Next, run the DPGDownloader Software. A shortcut will be installed to

your Start menu during the installation of the DAC Software Suite. To begin, click on the DPGDownloader shortcut in your

Programs menu, typically at Start > Programs > Analog Devices > DPG > DPGDownloader.

The basic parts of the DPGDownloader window are: Hardware Config Panel, SPI GUI Launch Button, Vector Generation Pull-

Down Menu, Vector Palette, Vector Selection Panel and the Download and Play buttons.

DPG2

DCI

USB I&Q DATA

Spectrum

Analyzer

USB

CLOCK

AD9783 /81/80

Evaluation Board

DAC Clock

Source AQM LO Clock

Source

+5V Power

Supply

DCO

Quick Start Guide

AD9783/81/80-DPG2-EBZ

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D00000-0-1/07(A)

Figure 5 –DPGDownloader Window

-If the AD9783 evaluation board has been recognized by the PC, AD9783 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 = 300MHz, Desired Frequency = 50 MHz, etc.). Check the “Generate Complex Data (I&Q)”

box. Note that the Sample Rate should match the input sample rate or the DAC update rate since this part has no

interpolation. Also, the Unsigned data needs to be unchecked because the AD9783 SPI defaults to 2’s complement data

format.

-Select the I and Q data vectors in the data selection panel.

-Launch the AD9783 SPI GUI by clicking the AD9783 SPI button.

Figure 6 AD9783 SPI VI Panel control

- When the

Run

button is clicked, the SPI controller will run continuously. It will both write and read from the AD9783.

-The DCO frequency field in the DPGDownloader window should now be reading something close to 500MHz.

-Next hit the download button. This transfers the data from the PC to the DPG memory.

Quick Start Guide

AD9783/81/80-DPG2-EBZ

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D00000-0-1/07(A)

-When the vector has finished downloading, hit the play button. This starts the DPG2 transmitting data to the eval

board.

-The output from J5 (IOUT1P)or J9 (IOUT2P) should be a 500MHz tone as shown below:

-As the DAC sample rate is increased above 350MSPS , the setup, hold and input timing delays will need to be used to get

the proper timing on the data inputs. The spectrum will be bad prior to adjusting these delays as discussed in the data

sheet with sample rates above 350MSPS .

Figure 7 Iout1P Output Signal Screenshot

Quick Start Guide

AD9783/81/80-DPG2-EBZ

registered trademarks are the property of their respective owners.

D00000-0-1/07(A)

Selecting the Modulator Outputs

By default, solder jumpers JP4, JP5, JP6, and JP7 configure the evaluation board for the DAC outputs to be observed at SMA J5 for

IOUT1P and J9 for IOUT2P. 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.

Figure 8 –a) DAC Output Configuration b) Modulator Output Configuration

AD9783 SPI Application

The SPI application is split into two sections. On the left are the controls for DAC and the right side are the SPI registers as read

back from the part. The left side of the panel allows control of the different features of the AD9783 but can be left in the default

positions if you are not running at the very high sample rate>350MSPS . 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 AD9783/1/0

datasheet. In the interest of continuous quality improvements, the images below may not exactly match your version of the

software. In order to set the registers with the VI you must click the mouse on the arrow under the edit for updating what is

selected below or the right circular arrows continuously updates as features are selected in the various sections of the VI

Power Down Control

The first set of switched on the far left let you power down the DACs, or Aux DACs, Data,

Data format

The part defaults to two’s compliments but can be changed to unsigned binary.

Seek

The Seek bit is used for optimizing the setup, hold and timing delays for high sample rates as described in the data sheet.

DAC Mode

The main DACs can be used in normal mode, mix mode or return to Zero mode. The registers below also allow

DATA Clock

The data clock section includes control for Data clk delay if needed for adjusting the timing on the interface.

PLL Control

The AD9779A has an on-chip PLL. When

PLL_ENABLE

is turned on, the chip will automatically select the appropriate band using

the Divder1 and Divider0 values. The VCO Frequency must be between 1 and 2 GHz for proper operation. The auto-band select

can be bypassed by enabling

PLL MANUAL

and entering a band in PLL Band Select. Divider1 and Divider0 must still be chosen

appropriately in this mode of operation.

Main DAC Control

This section controls the two main DACs in the AD9783. The Full-Scale Current of each DAC can be set with the

I DAC Gain

and

DAC Gain

controls. The 512 default is for 20ma outputs.

Aux DAC Control

The Aux DAC control section is used to program aux DACs for LO and image suppression out the output of the AQM. The default is

Quick Start Guide

AD9783/81/80-DPG2-EBZ

registered trademarks are the property of their respective owners.

D00000-0-1/07(A)

the Aux DACs are programmed power down.

Figure 9 AD9783 Evaluation Board

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.

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