Analog Devices AD9523 Manuale utente

Evaluation Board User Guide

UG-169

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/AD9524 Clock Generator

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 12

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 and AD9524 evaluation boards, and includes detailed

schematics and PCB layout artwork. The AD9523 and AD9524

are designed to operate in the same manner. This user guide

serves both boards but refers to the AD9523.

The AD9523 is defined 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 phase noise requirements

necessary for acceptable data converter SNR performance.

The input receivers, oscillator, and zero delay receiver provide

both single-ended and differential operation. When connected

to a 30.72 MHz to 122.88 MHz reference clock and a VCXO of

either 30.72 MHz to 122.88 MHz, the device generates low

noise outputs from a range of 0.96 MHz to 983.04 MHz.

DIGITAL PICTURE OF EVALUATION BOARD

09171-001

Figure 1. AD9523 Evaluation Board

UG-169 Evaluation Board User Guide

Rev. 0 | Page 2 of 12

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

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

Software Operation ...........................................................................6

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

Using the Software to Control the Functional Blocks of

AD9523...........................................................................................8

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

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

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

Output Driver Window ............................................................. 10

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

Quick Start Guide to the AD9523................................................ 12

REVISION HISTORY

7/10—Revision 0: Initial Version

Evaluation Board User Guide UG-169

Rev. 0 | Page 3 of 12

EVALUATION BOARD HARDWARE

The following instructions are for setting up the physical

connections to the AD9523 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.

9171-002

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 evaluation software before connecting

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

evaluation 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 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 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 pair.

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 config-

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

the dc-to-dc converter only. This is useful for measuring the

AD9523 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. Connect

a 4 V bench supply to the L1 pad.

UG-169 Evaluation Board User Guide

Rev. 0 | Page 4 of 12

USING I2C SERIAL PORT MODE

9171-004

Figure 3. I2C Address Jumper Setting

1. 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.

2. On the evaluation software, select Configure Serial Port

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

3. 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-169

Rev. 0 | Page 5 of 12

EVALUATION BOARD SOFTWARE SETUP

The instructions included in this section are for setting up the

AD9523 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 evaluation software CD-ROM into a PC

CD disc drive.

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

AD9523EV 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

AD9523Eval_Setup1.1.0.exe. Follow the installation

instructions. The default location for the evaluation

software is C:\Program Files\Analog Devices\AD9523

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 Eval Software to run the AD9523

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 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.

5. If you connect the evaluation board while the evaluation

board software is running, the window shown in Figure 4

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.

09171-005

Figure 4. SYNC Evaluation Software Window

6. 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 5).

09171-006

Figure 5. Select USB Device Window

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Rev. 0 | Page 6 of 12

SOFTWARE OPERATION

The main window of the AD9523 evaluation board software

comprises subsections that correspond to the major functional

blocks of the AD9523 (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 on the main window may start blinking. This

indicates that there are settings that have not been loaded to the

AD9523 evaluation board. Click WRITE to load these settings

to the evaluation board.

9171-007

Figure 6. AD9523 Evaluation Software Main Window

Evaluation Board User Guide UG-169

Rev. 0 | Page 7 of 12

MENU BAR OF MAIN WINDOW

File Menu

The File menu allows you to load a previously saved AD9523

setup file or to save a new AD9523 setup file. A setup file (.stp)

is a text file that contains the AD9523 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 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.

9171-008

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 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 serial port. If you

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

address to use. Note that it should 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.

9171-009

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).

9171-010

Figure 9. Debug Window

UG-169 Evaluation Board User Guide

Rev. 0 | Page 8 of 12

The Register Map Values window, accessed by selecting

registers (see Figure 10).

9171-011

Figure 10. Register Map Window

Help Menu

Selecting Help from the Help menu opens the About AD9523

window, which contains information such as revision number,

region information, and contact information.

USING THE SOFTWARE TO CONTROL THE

FUNCTIONAL BLOCKS OF AD9523

The Register W/R (write/read) section 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 checkbox 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 checkbox 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 checkbox adjacent to the UPDATE box

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

whenever registers are written to the AD9523.

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.

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

Figure 11 opens a window to allow configuration of PLL1 (see

Figure 12 ).

9171-012

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).

9171-013

Figure 12. PLL1 Control Box

Reference (REF) Divider Window

9171-014

Figure 13. Reference A or B Divider Window

The REF (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.

Evaluation Board User Guide UG-169

Rev. 0 | Page 9 of 12

Feedback (N) Divider Window

9171-015

Figure 14. N Divider Window

The feedback divider window shown in Figure 4 is accessed by

clicking the N DIVI llows you to set

DER box in Figure 12. It a

the feedback divider.

Charge Pump Window

9171-016

Figure 15. Charge Pump Window

The Charge Pump Setup window shown in Figure 15 is

accessed by clickin n Figure 12.

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

w configuration of PLL2 (see Figure 17).

g the CHARGE PUMP box i

This window is most often used to vary the charge pump

current.

PLL 2 CONTROLS

Clicking t

opens a window to allo

9171-017

Figure 16. PLL2 Box (in Main Window)

Clicking each individual box in the PLL 2 Controls window

opens a new window to allow configuration of that block.

9171-018

Figure 17. PLL 2 Controls Window

Feedback (N) Divider Window

9171-019

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.

UG-169 Evaluation Board User Guide

Rev. 0 | Page 10 of 12

Charge Pump Window

9171-020

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

9171-021

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 in Figure 6. It is usually sufficient to change only

the divide ratio, because the evaluation software and the

AD9523 duty cycle correction feature ensure that the output

duty cycle remains very close to 50%.

09171-027

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

9171-025

Figure 22. Toggling SYNC Signal

OUTPUT DRIVER WINDOW

9171-022

Figure 23. Output Driver Window

The output driver window shown in Figure 23 is accessed by

clicking any of the triangular output driver symbols on the right

side of the main window (see Figure 24).

9171-026

Figure 24. Output Drivers

It is important to power down unused outputs on the evaluation

board, because they can be a major source of unwanted spurs.

The outputs are ac-coupled with 100  differential resistors on

each output. This termination scheme is ideal for LVPECL

drivers. However, this scheme degrades the CMOS driver

performance. Improved CMOS driver performance is achieved

by removing the 100  resistors.

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