Analog Devices AD9125 Manual de usuario

AD9125 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 AD9125-EBZ 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 trademarksare 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

AD9125-EBZ Evaluation Board

Evaluation Board CD

Mini-USB Cable

RECOMMENDED EQUIPMENT

Sinusoidal Clock Source (at least 1.0 GHz)

Sinusoidal Clock Source (for modulator LO)

Spectrum Analyzer

DC Power Supply

Digital Pattern Generator Series 2 or 3 (DPG)

INTRODUCTION

The AD9125 Evaluation Board connects to the Analog Devices Digital Pattern Generator (DPG) to allow for quick evaluation of the

AD9125. Control of the SPI port in the AD9125 is available through USB with accompanying PC software.

To ease the subsystem evaluation, a clock distribution chip (AD9516) and a quadrature modulator are also designed into this evaluation

board.

SOFTWARE

The AD9125 Evaluation Board is designed to receive data from a Data Patten Generator (DPG). The DAC Software Suite, plus the AD9125

Update, is required for evaluation. 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 DPG) and the AD9125 SPI

Controller application. The AD9125 Evaluation Board DPGDownloader software has an easy-to-use legacy graphical user interface (GUI),

but ACE, a newer evaluation software from ADI, is the preferred evaluation software. ACE can be downloaded from the ACE website at

https://wiki.analog.com/resources/tools-software/ace. The ACE plug-in for the evaluation board is available for download on the AD9125

eval webpage in the software section at http://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-

kits/EVAL-AD9125.html#eb-overview.

HARDWARE SETUP

Connect a +5V DC power supply to the banana jacks (P5 and P6). A clock source should be connected to the SMA jack labeled J1 (CLKIN)

and should be set to 500 MHz and 3 dBm. A second clock source should be connected to the SMA jack labeled J9 (LO_IN). This source

should be set to 1.8 GHz and 0 dBm. The AD9516 buffers this clock and distributes clock signals with proper frequencies to the AD9125

and the DPG. In order to monitor the AD9125 outputs, a spectrum analyzer should be connected to the SMA jack labeled J3 (DAC1_P) for

I channel DAC, J8 (DAC2_P) for Q channel DAC, or J6 (MOD_OUT) for the quadrature modulator output. The DPG connects through

connector P1 and P2 on the left edge of the evaluation board, and the USB cable should be connected to the mini USB connector labeled

XP2 USB on the lower left side of the board. Note that the PC software needs to be installed before connecting the USB cable to your

computer.

Quick Start Guide AD9125-EBZ

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JUMPER CONFIGURATIONS

There are 7 pin jumpers and 13 solder jumpers on the evaluation board. The pin jumpers are corresponding to the 6 supplies, i.e., AVDD3.3,

DVDD1.8, CVDD1.8 and etc, on the board. They serve as ‘switches’ that determine if the LDOs on board or external supplies are used for

each individual supply. Most of the pin jumpers, except JP1, are 2 pin jumpers. They are shunted by default,

which means on board LDOs are used. When an external supply is necessary, pull off the shunt from the corresponding supply and connect

the external supply to the SMA jack close to the jumper. JP1 should be left in the default configuration.

Solder jumpers JP4, 5, 6, and 17 determine whether the DAC outputs go to the SMA connectors or to the modulator inputs. When direct

DAC outputs are to be monitored, JP4, 5, 6, and 17 should be configured as what Figure 1 shows. When the modulator output is to be

measured, they should be configured as what Figure 2 shows.

Figure 1: DAC Output Configuration Figure 2: Modulator Output Configuration

The solder jumper on the left side of C139 determines whether the ref/sync clock of the AD9125 is from the AD9516 or an external source

through the SMA jack J14 (AD9125_REF_CLKIN). When the AD9516 is used for the clock source, the jumper should be configured so

that the center pad is connected to the top pad. When an external source is used, the center pad should be connected to the bottom pad.

Other solder jumpers should be left in the default configuration.

GETTING STARTED – SINGLE TONE TEST

It is suggested that the basic set-up is verified before making any modifications to the evaluation board. This can be done with either ACE,

the preferred evaluation software, or the SPI GUI. Use the modulator output jumper configuration for the single tone test. Other

configuration outputs are also in the “Results” section.

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ACE Evaluation Software

Open ACE from the start window. It can be found by following the file path to the program or by searching in the windows search bar for

“A C E .” T h e icon indicates the ACE software.

If the board is connected properly, ACE will detect it and display it on the Start page under “Attached Hardware.” Double click this board.

Ensure that the button is green in the subsystem image under the “System” tab. If not, click it, select the AD9125, and click “Acquire.”

Double click on the subsystem image.

Figure 2: Detected AD9125 in ACE Figure 4: AD9125 Subsystem

To the left of the board diagram, click “Modify” under “Initial Configuration Summary” to edit the DAC and PLL setup of the board. In

some cases, the “Initial Configuration” page will already be shown.

Figure 5

Alter the inputs to match Figure 6. Click “Apply.”

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Figure 6

Double click on the dark blue AD9125 on the board diagram. Ensure that the settings of the AD9125 match with Figure 7 and click “Apply

C h a n g e s .”

Figure 7

Open the DPG Downloader software. The ‘DCO frequency’ shown should be 250MHz. (Due to the resolution of the DPG frequency

counter, the measured frequency could be a little off). In the ‘evaluation board’ drop down menu, the selection should be shown as ‘AD9125’.

This selection is automatically done when you plug the USB cable into the evaluation board.

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Figure 8

Select ‘Single Tone’ in the ‘Add Generated Waveform’ drop down menu in the DPG2 Downloader. Set the sample rate to 250MHz and the

desired frequency to 31MHz. Check the box of ‘Generate Complex Data (I&Q)’. Pick the generated waveforms in the ‘I Data Vector’ and ‘Q

Data Vector’. Click Download ( ) and Play ( ). This results in a single-tone at the DAC output centered at 31MHz. The current on the

5V supply should be approximately 700mA with JP11 open (modulator supply off).

The resulting spectrum is in Figure 10 in the “Results” section.

SPI Software

This setup configures the AD9125 to generate a sine wave by using the DPG as a data source. This allows the user to measure the singletone

AC performance at the DAC output. Install the software as described in the Software section, and connect all the required cables as described

in the Hardware Setup section. Turn on the power supply.

For this setup, the clock source is set to generate a 500MHz tone at 3dBm. Using 2x interpolation and word mode, the data clock should be

250MHz. Jumpers JP4, 5, 6, and 17 should be set to their DAC output position. Open the AD9125 customer SPI software and go to the 2nd

tab (data clock). Set the interpolation rate to 2X. Hit ‘run’ button. This will set the part to 2x interpolation mode and configure the clock

going into the DPG to half of the DAC rate.

In DPG Downloader software, the ‘DCO frequency’ shown should be 250MHz. (Due to the resolution of the DPG frequency counter, the

measured frequency could be a little off). In the ‘evaluation board’ drop down menu, the selection should be shown as ‘AD9125’. This

selection is automatically done when you plug the USB cable into the evaluation board.

Select ‘Single Tone’ in the ‘Add Generated Waveform’ drop down menu in the DPG2 Downloader. Set the sample rate to 250MHz and the

desired frequency to 31MHz. Check the box of ‘Generate Complex Data (I&Q)’. Pick the generated waveforms in the ‘I Data Vector’ and ‘Q

Data Vector’. Click Download ( ) and Play ( ). This results in a single-tone at the DAC output centered at 31MHz. The current on the

5V supply should be approximately 700mA with JP11 open (modulator supply off).

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Results

The final result of this setup should be a clean 31 MHz tone as shown below. To best verify results, match the settings of the spectrum

analyzer to those shown in Figure 10.

Figure 10

Using the DAC output jumper configuration, along with the same ACE and DPGDownloader setups, the resulting spectrum out of J3 is in

Figure __ and the resulting spectrum of J8 is in Figure __.

Quick Start Guide AD9125-EBZ

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APPENDIX A: SPI CONTROLLER

The SPI Controller application is split into several tabs. These tabs group related functions. Several of the functions provided by the SPI

Controller are described here, as they relate to the evaluation board. For complete descriptions of each register, refer to the AD9125

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

Running the SPI Controller

When the Run button is clicked, the SPI controller will run once. It will both write and read from the AD9122/AD9125 and setup the

clock chip (AD9516) on the evaluation board. The Run Forever control will setup both the AD9122/AD9125 and AD9516. This mode of

operation will continue to read from the chip and will update the SPI when any of the controls change. The Force Write and Read Only

controls force the controller to write all the controls to the evaluation board or only read from the SPI port.

Figure 11

Data Clock Control

This section, shown in Figure 2, provides control over the Interpolation Rate and Course Modulation. Once the controller is executed,

the Modulation Description field will return a summary of control. If an improper selection is made, the field will return ‘Invalid.’ The

DATAFMT field selects the number format of the incoming data, between unsigned (Binary) and signed (2’s compliment). The QFirst

control selects which DAC receives data first from the interleaved bus. For use with the DPG2, this should always be set to IQ Pairs. The

Interface Mode selects how wide the data bus will be. This setting will need to match the setting in the DPG AD9125 panel for proper

operation with the DPG2.

Figure 12

NCO Control

This tab controls the Fine Modulation within the AD9122/AD9125. The top portion of this tab helps the user easily control the frequency

shift. It will calculate the NCO Frequency using Data Frequency entered by the user. The NCO can shift the signal by at most +/- fnco/2.

An indicator also displays the frequency shift from the course modulation on the previous tab. The total shift will be the sum of the course

and fine modulations. To manually enter the Frequency Tuning Word (FTW), the Enable Advanced Control will bypass the calculations

on the top of the page.

PLL Control

The AD9122/AD9125 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. This tab provides the calculation for the DAC Freq and VCO Freq based on the Reference Clock

and the value of the dividers. The VCO Frequency must be between 1 and 2 GHz for proper operation. The auto-band select can be

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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.

Interrupts

This tab provides a visual indication of the state of each interrupt. Enabling the button to the left of each interrupt with enable the

interrupt. A green indicator to the right of the button will light when the interrupt is asserted. Once asserted, the interrupt can be

acknowledged by pressing the Clear button.

Main DAC Control

This tab controls the two main DACs in the AD9122/AD9125. The Full-Scale Current of each DAC can be set with the I DAC Gain and Q

DAC Gain controls. The I Sleep and Q Sleep controls put their respective DAC into a low-power sleep state. When the AD9122/AD9125 is

used with a modulator, the Phase Compensation/DC Offset controls can be used to correct any mismatches between the two DACs.

AUX DAC Control

As with the main DACs, the full-scale current of the auxiliary DACs can be set over the SPI port. Each DAC can also be powered down.

Sampling Error Detection

The Sampling Error Detection (SED) checks the data inputs. An 8-byte signature is handed to the AD9122/AD9125. The controller can

automatically generate and load the vectors using the DPG2 device. Indicators display the result of the comparison between the input

data and the expected signature.

SPI Map

The SPI Map tab provides an overview of all the settings currently written to the part. The individual register values are indicated

graphically (with red and green boxes) and numerically. The numeric results can be used in whatever system the AD9122/AD9125

connects to, to duplicate the current settings in the end system.

AD9516 Control

The evaluation board contains its own clock chip. The AD9516 has an optional on-chip PLL. The top half of the control tab helps the user

select the appropriate control values for the PLL controller. If the PLL is bypassed, the DAC Clock has the same frequency as the input to

the AD9516. Two additional clocks, Ref Clk and DCO Clk, are generated based off of the DAC Clock. The DCO Clock controlling the

data frequency can be synced with the interpolation rate on the Data Clock Control tab. If this is enabled, changing the interpolation rate

will automatically update the AD9516 to have the appropriate DCO Clock Divider Ratio.

Save and Load

The SPI controller has options to save and load all the control registers. The save takes place after the controller is run once and the load

happens before any of the read or writes to the evaluation board.

APPENDIX B - ACE SOFTWARE FEATURES

The ACE software is organized to allow the user to evaluate and control the AD9125A evaluation board. The “Initial Configuration” wizard

(Figure 6) controls the DAC and PLL setups. Block diagram views of the board (Figure 5) and chip (Figure 7) contain elements that can be

used to vary parameters like ref current and data format. These parameters can be changed using check boxes, drop down menus, and input

boxes. Some parameters do not have settings shown in the diagram. Double click on the parameter to view the available settings.

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Figure 33: NCO settings for the AD9125

In addition, some parameters can be enabled or disabled. This feature is evident by the color of the block parameter. For example, if the

block parameter is dark blue, the parameter is enabled. If it is light grey, it is disabled. To enable or disable a parameter, click on it.

Figure 44: Disabled parameter from the AD9125 Figure 15: Enabled parameter from the AD9125

More direct changes to registers and bit fields can be made in the memory map, which is linked from the chip block diagram (Figure 7)

through the “Proceed to Memory Map” button. In this view, names, addresses, and data can be manually altered by the user.

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Figure 56: Bench Set-Up

ACE also contains the Macro Tool, which can be used to record register reads and writes. This is executed in the memory map view or with

the initialization wizard. To use, check the “Record Sub-Commands” checkbox and press the record button. Changes in the memory map,

which are bolded until they are applied to the part, are recorded as UI commands by the macro tool once the changes are made. Changed

register write commands for the controls are also recorded. Hit “Apply Changes” to execute the commands and make changes in the memory

map. To stop recording, click the “Stop Recording” button. A macro tool page with the command steps will be created. The macro can be

saved using the “Save Macro” button so that it may be loaded for future use.

Figure 67: Macro tool in ACE. The “Stop Recording,” “Record,” and “Save Macro” commands are located at the top of the macro tool

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