ANALOG DEVICES UG-075 Service Manual

Evaluation Board User 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

UG-075

AD9516-x, AD9517-x, and AD9518-x Evaluation Board

FEATURES

Simple power connection using 6 V wall adapter and

on-board LDO voltage regulators LDOs are easily bypassed for power measurements 8 ac-coupled differential LVPECL SMA connectors 2 ac-coupled LVPECL differential headers 2 dc-coupled differential LVDS SMA connectors that are

reconfigurable to four CMOS SMA connectors 2 dc-coupled LVDS differential headers that are

reconfigurable to four CMOS connectors SMA connectors for

2 reference inputs

Charge pump output

Clock distribution input USB connection to PC 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

APPLICATIONS

Clocking of analog-to-digital and digital-to-analog

converters up to 2.9 GHz Networking and communications line cards Test and measurement equipment Wireless base stations, controllers Clock cleanup/jitter attenuation Clock distribution

GENERAL DESCRIPTION

The AD9516-x, AD9517-x, and AD9518-x are very low noise PLL clock synthesizers featuring an integrated VCO, clock dividers, and up to 14 outputs. The AD9516 features automatic holdover and a flexible reference input circuit allowing for very smooth reference clock switching. The AD9516 family also features the necessary provisions for an external VCXO.

The AD9516 evaluation board is a compact, easy-to-use platform for evaluating all features of the AD9516. This user guide covers all six versions of the AD9516 family, as well as the AD9517 and AD9518 families (hereafter referred to as AD951x). The AD9516, AD9517, and AD9518 differ only in package size, and the number of outputs. The evaluation software main window for the AD9517 and AD9518 reflects fewer outputs, but the operation is identical for all devices.

Although the Quick Start Guide to the AD9516 PLL section applies specifically to the AD9516-3, increasing the N (feedback) divider and channel divider increases the VCO frequency to the allowable frequency range of other AD9516 versions.

For the AD9516-5, which lacks an internal VCO, certain portions of this document that apply to the internal VCO (such as VCO calibration) can be ignored.

For convenience, detailed information from the AD9516 data sheet has been included here. Use this user guide in conjunction with the AD9516, AD9517, and AD9518 data sheets, as well as additional documentation available at www.analog.com.

AD9516 EVALUATION BOARD

Figure 1.

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UG-075 Evaluation Board User Guide

Features .............................................................................................. 1

Applications ....................................................................................... 1

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

AD9516 Evaluation Board ............................................................... 1

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

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

Power and PC Connections ........................................................ 3

Signal Connections ...................................................................... 3

Bypassing the Wall Power Supply ............................................... 3

Bypassing the PLL (Clock Distribution Only) ............................. 3

Using an External VCXO ............................................................ 3

Evaluation Board Software .............................................................. 4

Software Installation .................................................................... 4

Running the Software .................................................................. 4

Quick Start Guide to the AD9516 PLL .......................................... 5

Evaluation Software Components .................................................. 7

Main Window ............................................................................... 7

PLL Reference Input Window .................................................... 8

PLL Configuration Window ....................................................... 8

REFMON, STATUS, and LD Buttons.........................................8

SYNC, PD (Power Down), and RESET Buttons .......................9

Reference (R) Divider Window ...................................................9

R and N Delay Window ................................................................9

Feedback (N) Divider Window ...................................................9

Phase Frequency Detector (PFD) Window ............................ 10

Charge Pump Window .............................................................. 10

VCO Calibration Window ........................................................ 10

Channel Divider Window ......................................................... 11

LVPECL Output Driver Window ............................................. 11

LVDS/CMOS Output Driver Window .................................... 12

LVDS/CMOS Output Delay Window ..................................... 12

Debug Window ........................................................................... 12

Evaluation Software Menu Items.................................................. 13

Menu Bar ..................................................................................... 13

AD9516 PLL Loop Filter ............................................................... 14

Loop Filter for Clock Cleanup .................................................. 15

ESD Caution................................................................................ 16

REVISION HISTORY

1/10—Revision 0: Initial Version

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Evaluation Board User Guide UG-075

EVALUATION BOARD HARDWARE

The following instructions are for setting up the physical connections to the AD951x evaluation board.

When connecting the evaluation board to a PC for the first time, the user must install the evaluation software prior to connecting the evaluation board.

POWER AND PC CONNECTIONS

Use the following steps to connect the AD951x evaluation board to its power supply and lab equipment.

1. Install the AD951x evaluation software. Administrative

privileges are required for installation. The 64-bit versions of Windows® are not supported.

2. Connect the wall power supply to the main power

connector labeled P2. The following five LEDs should be on: CR1 (USBSTAT), CR7 (VS), CR8 (VS-CP), CR9 (VS_USB), and CR10 (VS_LVPECL).

3. Connect the USB cables to the evaluation board and

the computer. The red LED labeled CR2 (VBUS) on the AD951x evaluation board should illuminate and the CR1 (USBSTAT) LED should start blinking.

4. If the Found New Hardware Wizard window

automatically appears when the evaluation board is connected, select Install the software automatically and click Next. The Found New Hardware Wizard window may appear twice, and a system restart may be required. Refer to the Evaluation Board Software section for details on running the AD951x evaluation board software.

If the USBSTAT LED is not blinking, ensure that:

• Jumpers are installed on Position S1 and Position S2.

• The jumper on S4 is across the center pin and the

minus symbol.

• The USB port on the PC is operational and that the USB

cable is not damaged.

SIGNAL CONNECTIONS

To connect signals, use the following steps:

1. Connect a signal generator to the J10 SMA connector. By

default, the reference inputs on this evaluation board are ac-coupled and terminated 50 Ω to ground. An amplitude setting of 0 dBm to 6 dBm is fine.

2. If the user wants to connect a signal to REF2, connect that

signal to the J13 SMA connector. DC-coupling is recommended in applications requiring automatic hitless reference switching. There is a possibility that the device receive buffer can chatter when an ac-coupled clock stops toggling.

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

equipment to any of the J0 to J9 SMA connectors on the right side of the board.

OUT0 through OUT5 are ac-coupled LVPECLs. OUT8 and OUT9 are dc-coupled and have no output termination. These allow the user to evaluate the AD951x output driver in either LVDS or CMOS mode.

BYPASSING THE WALL POWER SUPPLY

To bypass the wall power supply, remove the following ferrite beads (on the backside of the board): F7, F4, F2, and F6. Connect a bench power supply to TB1 on the evaluation board. This is useful for making AD951x power consumption measurements.

BYPASSING THE PLL (CLOCK DISTRIBUTION ONLY)

To bypass the PLL, connect a signal generator to the SMA connector labeled CLK. By default, this connection is ac-coupled to the CLK pin and terminated with a 50 Ω resistor to ground. Refer to the Evaluation Software Components section for details on running the AD951x evaluation board software.

USING AN EXTERNAL VCXO

To use an external VCXO, use the following steps.

1. Install a 0 Ω resistor at R9 and remove R8.

2. Connect a loop filter and external VCO/VCXO input to J12.

3. Connect the external VCO/VCXO output to the J11 SMA

connector (CLK input).

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EVALUATION BOARD SOFTWARE

Use the following instructions to set up the AD951x evaluation board software.

SOFTWARE INSTALLATION

Do not connect the evaluation board until the software installation is complete.

1. The evaluation software and documentation can be

downloaded from www.analog.com.

2. If the software was downloaded, skip to Step 3.If installing

from the CD, insert the AD951x evaluation software CD. Double-click My Computer and then double-click the AD9516_17_18EV CD icon. A window opens showing the contents of the CD divided into four sections: Datasheet,

Layout, Schematic, and Software. The file named readme.txt contains a description of the CD contents as

well as any additional instructions or information. Doubleclick the Software folder.

3. Double-click AD9516_17_18Eval_Setup1.1.0.exe. (Note

that the website may have a version newer than Version

1.1.0.) Follow the installation instructions. The default location for installation of the evaluation software is: C:\Program Files\Analog Devices\AD9516 Eval Software\.

RUNNING THE SOFTWARE

Power up and connect the evaluation board to the PC. See Evaluation Board Hardware section for details on the various connectors on the evaluation board.

1. Double-click AD9516_17_18 Eval Software to run the

AD951x evaluation software. Depending on whether the evaluation board was found by the software, either light blue text appears in a pop-up window, indicating that the evaluation board was found, or red text appears, indicating that the evaluation board was not found.

2. If the evaluation board is found, click anywhere in the pop-

up window with the Evaluation Software Ready message, and the main window for the software appears. Proceed to the Evaluation Software Components section for details about running the software. If the evaluation board is not found, a dialog box appears allowing you to select which AD951x evaluation board is connected while the software runs in standalone mode.

See the Evaluation Board Hardware section for information on connecting the evaluation board.

If the evaluation board is connected while the evaluation software is running, the window in Figure 2 appears to prompt

you to load the evaluation board with the evaluation software settings or read the evaluation board settings into the software.

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Figure 2. SYNC Evaluation Software Window

If the evaluation board was not automatically detected when it was connected, you can also select the Select Evaluation Board option from the I/O menu (see Figure 24), and select Ezssp-0, Ezssp-1, or Ezssp-2.

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Figure 3. Select USB Device Window

See the Evaluation Software Components section for a description of the evaluation software features, or the Quick Start Guide to the AD9516 PLL section for details on the individual blocks of the AD951x.

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QUICK START GUIDE TO THE AD9516 PLL

When the evaluation software is installed, the evaluation board is connected, and the software is loaded, use the following steps to configure and lock the PLL. These steps assume that the input signal is present, the evaluation board has not been modified, and that the PLL loop filter is suitable for the user’s application.

This quick start guide covers only simple PLL operation to start the PLL. See the AD9516 data sheet and Evaluation Software Components section for a detailed explanation of the various AD9516 features.

The following case is an example for the AD9516-3 using the values in Tabl e 1.

Table 1.

Parameter Value

Input Frequency 20 MHz on REF1 Output Frequency 200 MHz on OUT1 Reference Divider 2 Phase Detector Frequency 10 MHz Feedback Divider 200 VCO Frequency 2000 MHz VCO Divider 2 Channel Divider 5

1. Turn the PLL on by selecting Normal Op from the PLL

MODE box found at the top of the main window (see

Figure 8).

2. Enter the intended reference input frequency (in

megahertz) in the REF 1 (MHz) box at the upper left corner of the main window.

3. Click the triangular buffer symbol immediately to the right

of the input reference frequency (see Figure 4) boxes to load the Reference Input Control window shown in Figure 5. Turn the REF1 reference input buffer on by selecting the Enable REF1 check box, and then clicking OK.

4. When the window closes, the WRITE button under the

REGISTER W/R section in the main window blinks red. This indicates there are settings that have not been loaded to the AD9516 evaluation board. Click the blinking red WRITE button to load these settings to the evaluation board.

5. Select the VCO as the input to the clock distribution

circuitry by clicking the mux symbol that is located immediately to the right of the VCO (MHz) box (see Figure 6).

Figure 5. Reference Input Control Window

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Figure 6. Buffer Symbol

When the VCO is selected, the border of the VCO (MHz) box changes from gray to black. The current VCO frequency is shown in the VCO (MHz) box.

Figure 4. Buffer Symbol

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