Analog Devices UG-182 Manuel utilisateur

Evaluation Board User Guide

UG-182

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

Evaluating the AD9523-1 Clock Generator

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 16

FEATURES

Simple power connection using USB connection and

on-board LDO voltage regulators

LDOs are easily bypassed for power measurements

AC-coupled differential SMA connectors

SMA connectors for

2 reference inputs

2 PLL status outputs

1 reference test input

2 VCXO interface inputs/outputs

Microsoft Windows®–based evaluation software

with simple graphical user interface

On-board PLL loop filter

Easy access to digital I/O and diagnostic signals

via I/O header

Status LEDs for diagnostic signals

USB computer interface

Software calculator provides flexibility, allowing programming

of almost any rational input/output frequency ratio

GENERAL DESCRIPTION

This user guide describes the hardware and software of the

AD9523-1 evaluation boards. The evaluation board schematic

and PCB layout artwork can be found at www.analog.com.

The AD9523-1 is designed to support the clock requirements

for long-term evolution (LTE) and multicarrier GSM base station

designs. It relies on an external VCXO to provide the reference

jitter cleanup to achieve the restrictive low phase noise require-

ments necessary for acceptable data converter SNR performance.

The AD9523-1 evaluation board is a compact, easy-to-use plat-

form for evaluating all features of the AD9523-1. A 122.88 MHz

VCXO is mounted on the evaluation board to provide a complete

solution.

The input receivers are configured as differential but the evalua-

tion board has baluns to provide a single-ended input for easy

evaluation using common laboratory single-ended signal sources.

Output 8 is connected to an ADCLK905 clock buffer to provide

a way to evaluate an Analog Devices, Inc., buffer. Although the

ADCLK905 is a 1-to-1 buffer, the performance is similar to the

larger fanout buffer, for example, the 1-to-2 buffer, ADCLK925.

Output 1 and Output 9 are configured with baluns to provide a

single-ended output to drive most test equipment. Output 0 is

configured for differential zero delay operation.

DIGITAL PICTURE OF EVALUATION BOARD

09280-001

Figure 1. AD9523-1 Evaluation Board

UG-182 Evaluation Board User Guide

Rev. 0 | Page 2 of 16

TABLE OF CONTENTS

Features .............................................................................................. 1

General Description ......................................................................... 1

Digital Picture of Evaluation Board ............................................... 1

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

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

Setting Up Jumper Connections................................................. 3

Setting Up the Power and PC Connections.............................. 3

Setting Up the Signal Connections ............................................ 3

Setting Up the PLL2 Loop Filter Capacitor .............................. 3

Bypassing the 6 V Wall Socket Power Supply........................... 3

Using I2C Serial Port Mode ......................................................... 4

Evaluation Board Software Setup ................................................... 5

Installing the Software ................................................................. 5

Using the Software........................................................................ 5

Evaluation Board Software Operation............................................6

Menu Bar of Main Window .........................................................7

Using the Software to Control the Functional Blocks of

AD9523-1 .......................................................................................8

PLL 1 Controls...............................................................................8

PLL 2 Controls...............................................................................9

Channel Divider Window......................................................... 10

Output Driver Window ............................................................. 11

EEPROM Control ...................................................................... 11

Using the Evaluation Board to Program an AD9523-1 on a

Customer Board.............................................................................. 12

Quick Start Guide to the AD9523-1 ............................................ 13

REVISION HISTORY

10/10—Revision 0: Initial Version

Evaluation Board User Guide UG-182

Rev. 0 | Page 3 of 16

EVALUATION BOARD HARDWARE

The following instructions are for setting up the physical

connections to the AD9523-1 evaluation board.

SETTING UP JUMPER CONNECTIONS

The evaluation board is configured for proper PC control and

operation. If the jumpers are inadvertently moved, use Figure 2

and Figure 3 to reconfigure the board.

9280-002

Figure 2. USB and SPI Jumper Connections

SETTING UP THE POWER AND PC CONNECTIONS

Set up the power and PC connections as follows:

1. Install the AD9523-1 evaluation software before connect-

ing the evaluation board to the PC for the first time (see

the Installing the Software section). Administrative

privileges are required for installation.

2. Connect the 6 V wall adapter to Connector P7 of the evalua-

tion board.

3. Connect the USB cables to the evaluation board and the

computer.

4. Found New Hardware Wizard automatically appears

when the evaluation board is connected. Select Install the

software automatically and then click Next.

The Found New Hardware Wizard may appear twice, and

a system restart may be required.

Refer to the Evaluation Board Software Setup section for details

on running the AD9523-1 evaluation board software.

SETTING UP THE SIGNAL CONNECTIONS

After setting up the power and PC connections, use the

following procedure to set up the signal connections:

1. Connect a signal generator to REF A SMA Connector J9.

By default, the reference inputs on this evaluation board

are ac-coupled and terminated with 50  to ground. An

amplitude setting of 6 dBm is sufficient.

2. Connect an oscilloscope, spectrum analyzer, or other lab

equipment to any of the OUTx SMA connectors on the

right side of the board. The output connectors are single-

ended outputs of a differential pair. A 50 Ω termination

should be placed on all unused differential output pairs.

SETTING UP THE PLL2 LOOP FILTER CAPACITOR

PLL2 requires an external loop filter capacitor. To achieve the

best jitter performance, reference Capacitor C6 to LDO_VCO,

Pin 12. This can done by installing R6 and removing R4. These

connections should have been performed at the factory.

BYPASSING THE 6 V WALL SOCKET POWER

SUPPLY

The evaluation board contains a dc-to-dc converter to step down

the 6 V to 2.2 V and 4 V. Linear regulators are then used to

further regulate the 2.2 V to 1.8 V supply domain and the 4 V to

the 3.3 V supply domain. The evaluation board can be configured

to bypass the dc-to-dc converter and linear regulators or the dc-

to-dc converter only. This is useful for measuring AD9523-1

power consumption. Refer to the evaluation board schematics

provided on the CD in the evaluation board kit (also available at

www.analog.com) for further details.

Bypass the 6 V power supply (dc-to-dc converter and linear

regulators) as follows:

1. Note that it is very important to not have the 6 V supply

connected to the evaluation board while using external

supplies. To be safe, remove the inductors from each linear

regulator output (L4 to L15).

2. Connect a bench power supply to each of the supply pins

on Header TP3 through Header TP15. If the inductors

were not removed in Step 1, then some of the supply pins

are connected together on the evaluation board and

damage to the external supply and/or evaluation board

may occur.

Bypass the 6 V power supply (dc-to-dc converter only) as

follows:

1. Remove L1, L2, L3, R39, R41, R40, and R42.

2. Connect a 2.2 V bench supply to Connector P19.

3. Connect a 4 V bench supply to the L1 pad.

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USING I2C SERIAL PORT MODE

9280-004

Figure 3. I2C Address Jumper Setting

To use the I2C serial Port mode, follow these steps:

1. Power down the board and shut down the software.

2. Set Jumpers P11 and P13 to the I2C position (see Figure 2).

3. Select the desired I2C address using Jumpers P5 and P6

(see Figure 3). Note that setting P5 and P6 low is reserved

for SPI mode.

4. Power up the board and connect the USB cable to the board.

5. Start the evaluation board software.

6. On the evaluation software, select Configure Serial Port

from the I/O menu (see the I/O Menu section).

7. Click the Reset Serial Port button, and then click Detect

Current Configuration (see Figure 8). A dialog box

should appear to acknowledge the I2C mode and address.

Evaluation Board User Guide UG-182

Rev. 0 | Page 5 of 16

EVALUATION BOARD SOFTWARE SETUP

The instructions included in this section are for setting up the

AD9523-1 evaluation board software.

INSTALLING THE SOFTWARE

Do not connect the evaluation board until the software

installation is complete. To install the software,

1. Insert the AD9523-1 evaluation software CD-ROM

into a PC CD disc drive.

2. Click My Computer, and then double-click the

AD9523-1EV CD icon.

A window opens showing the contents of the CD divided

into four sections: data sheet, layout, schematic, and software.

The readme.txt file contains a description of the CD-ROM

contents, as well as any last minute instructions or

information.

3. Double-click the Software folder, and then double-click

AD9523-1Eval_Setup1.1.0.exe. Follow the installation

instructions.

The default location for the evaluation software is

C:\Program Files\Analog Devices\AD9523-1

Eval Software\.

4. If there are any updates to the evaluation software on a

supplemental CD or in the \Software\Updates folder, be

sure to copy the new .exe file, as well as any setup files, to

the default location.

USING THE SOFTWARE

After the evaluation software has been installed, you can run

the software as follows:

1. Power up and connect the evaluation board to the PC.

2. Double-click AD9523-1 Eval Software to run the

AD9523-1 evaluation software.

A hardware installation window appears. Depending on

whether the evaluation board was found by the software, the

text in this window is either light blue, indicating that the

evaluation board was found, or red, indicating that the

evaluation board was not found.

3. If the evaluation board was found, click in the window

when the Evaluation Software Ready message appears.

The main window of the evaluation board software appears.

Proceed to the Evaluation Board Software Operation

section for more details about using the software.

4. If the evaluation board was not found, a dialog box appears

that allows you to select an evaluation board to use while

the software runs in standalone mode. Standalone mode is

useful for viewing and generating register setup files.

a. If the evaluation board was not automatically detected

when it was connected, choose Select Evaluation

Board from the I/O menu, and then select Ezssp-0,

Ezssp-1, or Ezssp-2 (see Figure 4).

09280-006

Figure 4. Select USB Device Window

5. If you connect the evaluation board while the evaluation

board software is running, the window shown in Figure 5

usually appears to prompt you to load the evaluation board

with the evaluation board software settings or to read the

current evaluation board settings into the software.

09280-005

Figure 5. SYNC Evaluation Software Window

UG-182 Evaluation Board User Guide

Rev. 0 | Page 6 of 16

EVALUATION BOARD SOFTWARE OPERATION

The main window of the AD9523-1 evaluation board software

comprises subsections that correspond to the major functional

blocks of the AD9523-1 (see Figure 6). These subsections, most

of which have their own window, are outlined in this section.

From the main window, the window for each functional block

can be accessed by clicking the appropriate box.

When a subsection window closes after clicking OK, the

WRITE button under REGISTER W/R on the main window

may start blinking. This indicates that there are settings that

have not been loaded to the AD9523-1 evaluation board. Click

WRITE to load these settings to the evaluation board.

09280-106

Figure 6. AD9523-1 Evaluation Software Main Window

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Rev. 0 | Page 7 of 16

MENU BAR OF MAIN WINDOW

File Menu

The File menu allows you to load a previously saved AD9523-1

setup file or to save a new AD9523-1 setup file. A setup file

(.stp) is a text file that contains the AD9523-1 register setup file,

plus any evaluation board settings.

To load a previously saved setup file, select Load Setup from

the File menu. Note that you must still perform a VCO

calibration. Alternatively, to save a new setup file, select Save

Setup from the File menu.

To exit the evaluation software, select Exit from the File menu.

However, note that you must save your setup before exiting; no

checking is performed to ensure that the existing setup is saved.

I/O Menu

The AD9523-1 evaluation system allows one PC to control

multiple evaluation boards. The Select USB Device window,

accessed by choosing Select Evaluation Board from the I/O

menu, allows you to select which evaluation board the software

controls (see Figure 7). Click Refresh List to detect a recently

connected evaluation board.

9280-008

Figure 7. Select USB Device Window

Selecting Configure Serial Port from the I/O menu allows you

to control how the USB controller interacts with the AD9523-1

serial port (see Figure 8) by configuring Register 0x0000 (shown

as 0000h in Figure 10).

The serial port configuration window allows you to control how

the USB controller interacts with the AD9523-1 serial port. If

you are using I2C mode, this window allows you to select which

address to use. Note that it needs to correspond to the settings

of Jumpers P5 and P6 on the evaluation board. You can also

click the Detect Current Configuration button to have the

evaluation software discover which I2C address is active.

9280-009

Figure 8. Serial Port Configuration Window

View Menu

The Debug window, accessed by selecting Debug Window from

the View menu, allows you to write and read registers directly and

to force the various configuration pins high or low (see Figure 9).

9280-010

Figure 9. Debug Window

UG-182 Evaluation Board User Guide

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The Register Map Values window, accessed by selecting

registers (see Figure 10).

9280-011

Figure 10. Register Map Window

Help Menu

Selecting Help from the Help menu opens the About AD9523-1

window, which contains information such as revision number,

region information, and contact information.

USING THE SOFTWARE TO CONTROL THE

FUNCTIONAL BLOCKS OF AD9523-1

The REGISTER W/R (write/read) section in Figure 6 has three

buttons and three check boxes.

The WRITE button transfers the values stored in the evaluation

software to the evaluation board. It blinks red when register

values have changed.

The READ button transfers the values stored in the evaluation

board to the evaluation software.

The UPDATE button issues an I/O update command by writing

to the I/O update register.

Selecting the All check box transfers all of the registers when

the WRITE button is clicked. When this box is not selected,

only the registers whose value has changed are written.

Selecting the Auto check box adjacent to the WRITE button

forces the evaluation software to write the register changes to

the evaluation board automatically when they occur.

Selecting the Auto check box adjacent to the UPDATE box

forces the evaluation software to issue an I/O update command

whenever registers are written to the AD9523-1.

SYNC, PD (Power Down), and RESET

The SYNC, PD, and RESET buttons allow you to control the

SYNC, PD, and RESET pins on the AD9523-1.

Each button has three options: Strobe, Latch, and Release.

Strobe activates the pin and then releases it. Latch holds the pin

active until the Release command is issued.

PLL 1 CONTROLS

The PLL 1 box in the main window (see Figure 6) allows you to

configure the PLL1 parameters. Clicking the PLL 1 box in the

main window, shown in Figure 11, opens a window to allow

configuration of PLL1 (see Figure 12 ).

9280-012

Figure 11. PLL1 Box (in Main Window)

Clicking each individual box in the PLL 1 Controls window

opens a new window to allow configuration of that block (see

Figure 13 for an example for the REF A Divider window).

09280-112

Figure 12. PLL1 Controls Window

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Reference (REF) Divider Window

09280-013

Figure 13. Reference A or Reference B Divider Window

The reference divider window shown in Figure 13 is accessed by

clicking the REF A Divider box in Figure 12. It allows you to

set the reference divider. There is a corresponding window for

both REF A and REF B dividers.

Feedback (N) Divider Window

09280-014

Figure 14. N Divider Window

The feedback divider window shown in Figure 14 is accessed by

clicking the N DIVIDER box in Figure 12. It allows you to set

the feedback divider.

Charge Pump Window

9280-016

Figure 15. Charge Pump Window

The Charge Pump Setup window shown in Figure 15 is

accessed by clicking the CHARGE PUMP box in Figure 12.

This window is most often used to vary the charge pump

current.

PLL 2 CONTROLS

Clicking the PLL 2 box from the main window (see Figure 16)

opens a window to allow configuration of PLL 2 (see Figure 17).

9280-116

Figure 16. PLL 2 Box (in Main Window)

Clicking each individual box in the PLL 2 Controls window

opens a new window to allow configuration of that block.

09280-017

Figure 17. PLL 2 Controls Window

UG-182 Evaluation Board User Guide

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Feedback (N) Divider Window

09280-018

Figure 18. N Divider Window

The N Divider window shown in Figure 18 is accessed by

clicking the N DIVIDER box in Figure 17. It allows you to set

the feedback divider.

VCO Divider 1 and Divider 2

The VCO dividers controls are located in the PLL 2 Controls

window shown in Figure 17. They allow you to set the frequency

feeding the channels. Channel OUT4 through Channel OUT9

can be configured for either Divider 1 or Divider 2. If Divider 2

is not required, it is recommended that it be turned off for best

spurious performance.

Charge Pump Window

9280-020

Figure 19. Charge Pump Window

The Charge Pump Setup window shown in Figure 19 is

accessed by clicking the CHARGE PUMP box in Figure 17.

This window is most often used to vary the charge pump

current.

CHANNEL DIVIDER WINDOW

9280-021

Figure 20. Channel Divider Window

The channel divider window shown in Figure 20 is accessed by

clicking the appropriate channel divider (see Figure 21) in the

main window shown in Figure 6. It is usually sufficient to

change only the divide ratio, because the evaluation software and

the AD9523-1 duty cycle correction feature ensure that the

output duty cycle remains very close to 50%.

09280-027

Figure 21. Channel Divider

You can also vary the phase offset by changing the phase offset

bits setting under the Divider Phase box in Figure 20. However,

for the new phase to take effect, the SYNC signal must be

toggled, by clicking the SYNC button shown in and

selecting Strobe SyncB.

Figure 22

9280-025

Figure 22. Toggling SYNC Signal

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