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AD9508 Evaluation Board User Guide

GENERAL DESCRIPTION

The AD9508 evaluation board is a compact, easy-to-use platform for evaluating all features of the AD9508. This user guide focuses on the AD9508 evaluation board and software. The AD9508 is a high performance 1:4 flexible clock buffer. Each output has a programmable divider that may be set via SPI/I2C or S-pin strapping. The AD9508 features both 2.5 V and 3.3V operation. For convenience, detailed information from the AD9508 data sheet has been included here. Use this user guide in conjunction with the AD9508 data sheet and software documentation available at www.analog.com.

Figure 1. AD9508/PCBZ

FEATURES

Simple power connection using 6V wall adapter and on-board LDO voltage regulators
8 ac-coupled single ended SMA output connectors (4 differential paths)
2 ac- coupled single ended SMA connectors for reference input
Pin selectable options for the following:
- 2.5V or 3.3V operation
- SPI/I2C or S-pin programmable
- OUT0 through OUT3 divide value
- OUT0 through OUT3 logic type
- Input logic type
USB connection to PC
Microsoft Windows-based evaluation software with simple graphical user interface(supports 64-bit versions of Windows)

APPLICATIONS

Low jitter, low phase noise clock distribution
Clocking high speed ADCs, DACs, DDSs, DDCs, DUCs, MxFEs
High performance wireless transceivers
High performance instrumentation
Broadband infrastructure

EVALUATION BOARD HARDWARE

The following instructions are for setting up the physical connections to the AD9508/PCBZ evaluation board. Before 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

Install the AD9508 evaluation software, uninstall prior versions of the software before installation updates. Administrative privileges are required for installation. The 64-bit versions of Windows® are supported.
Connect the 6V wall power supply to the main power connector labeled P500.
Connect the USB cable to the evaluation board and the computer. The red LED labeled CR300 on the AD9508 evaluation board should illuminate.
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.
Once the driver software has installed, the red LED labeled CR301 will blink.

Signal Connections

To connect signals, connect a signal generator to the J200(CLKIN) SMA connector. By default, the CLKIN input is connected to a balun for single ended to differential conversion. This path is differentially terminated to 100Ω and ac-coupled into the AD9508 reference inputs. An amplitude setting of 0 dBm to 6 dBm is fine. The CLKINB SMA input is grounded by default. To input a differential signal, the user must remove balun (T200) and resistor R221 and place resistors R209 and R210 with 0Ω. Connect an oscilloscope, spectrum analyzer, or other lab equipment to any of the J209 to J216 SMA clock OUT connectors on the edge of the board. OUT0 through OUT3 are ac-coupled outputs differentially terminated to 100Ω.

Pin Programming and Jumper Settings

Jumper P507 allows the user to select between 2.5V and 3.3V operation.

Jumper P100 allows the user to select between differential (LVDS/ PECL/ etc) and CMOS input logic types.

Jumper P101 allows the user to select which programming method (SPI/I2C/S-pin programming) will be used by the AD9508. Placing no jumper defaults the part to use SPI. I2C is not currently supported with the evaluation board software. When pin programming is selected, S-pins S0 through S5 are used to determine various divider ratios and output modes for each of the AD9508s outputs. Using the S-pins to program the part gives the user limited control of each channel divider ratio and no control of phase offset. Please refer to the AD9508 datasheet for a complete overview regarding the use of the part with S-pin programming.

Jumpers P102, P106, P110, and P114 connect and disconnect S-pins S0 through S3 to a SPI/I2C line. These need to be set with respect to the setting of P101. Table 1 describes the proper placement of these jumpers.

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Programming Pins	SPI or I2C	Pin Strapping
Programming Pins	Jumper Placement vs. Programming Method
S0	P102 = SCLK	P102 = S0P
S1	P106 = SDIO	P106 = S1P
S2	P110 = CSB	P110 = S2P
S3	P114 = SDO	P114 = S3P

Table 1. P102, P106, P110, and P114 Jumper Settings with Respect to Jumper P101 Setting

There are two more jumpers allocated for each S-pin that are used to obtain all 8 divider settings (for S-pins 0 through 3) and to select between logic types (S-pins 4 and 5). The first jumper is used to pull the S-pin up to VDD or down to GND. The second jumper is used to select one of the four resistor settings on the evaluation board. Table 2 describes the possible divider and output mode settings when in S-pin programming mode. Table 3 lists the jumper label associated with each divider ratio and driver mode setting.

Programming Pins	0 = 820Ω Pulled to GND	1 = 1.8kΩ Pulled to GND	2 = 3.9kΩ Pulled to GND	3 = 8.2kΩ Pulled to GND	4 = 820Ω Pulled to VDD	5 = 1.8kΩ Pulled to VDD	6 = 3.9kΩ Pulled to VDD	7 = 8.2kΩ Pulled to VDD	Description
Programming Pins	S-Pin Settings (0 through 7) vs. Resistor Value vs. Divide Value and Logic Type								Description
S0	÷1	÷2	÷3	÷4	÷5	÷6	÷8	÷16	S0 is assigned to the CH0 divider ratio only
S1	÷1	÷2	÷3	÷4	÷5	÷6	÷8	÷16	S1 is assigned to the CH1 divider ratio only
S2	÷1	÷2	÷3	÷4	÷5	÷6	÷8	÷16	S2 is assigned to the CH2 divider ratio only
S3	÷1	÷2	÷3	÷4	÷5	÷6	÷8	÷16	S3 is assigned to the CH3 divider ratio only
S4	HSTL/ HSTL	HSTL/ LVDS	HSTL/ DISABLE	LVDS/ HSTL	LVDS/ LVDS	LVDS/ DISABLE	DISABLE/ HSTL	DISABLE/ DISABLE	S4 is assigned to CH0/CH1 to select their output logic types
S5	HSTL/ HSTL	HSTL/ LVDS	HSTL/ DISABLE	LVDS/ HSTL	LVDS/ LVDS	LVDS/ DISABLE	DISABLE/ HSTL	DISABLE/ DISABLE	S5 is assigned to CH2/CH3 to select their output logic types

Table 2. Divider Ratio and Driver Mode Table for S0/S1/S2/S3/S4/S5 Pins*
*Driver modes are listed in the order of CH1/CH2 or CH3/CH4

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Programming Pins	820Ω / 1.8kΩ	3.9kΩ / 8.2kΩ	Pull to VDD / Pull to GND
Programming Pins	Evaluation Board S-Pin Jumper Labels
S0	P103	P104	P105
S1	P107	P108	P109
S2	P111	P112	P113
S3	P115	P116	P117
S4	P118	P119	P120
S5	P121	P122	P123

Table 3. Evaluation Board S-pin Jumper Labels

EVALUATION BOARD SOFTWARE

The AD9508 evaluation software allows the user to control the full functionality of the AD9508 through SPI/I2C communication on the evaluation board. Use the following instructions to set up the evaluation board software.

Software Installation

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

The latest evaluation software and documentation can be downloaded from http://www.analog.com/en/clock-and-timing/clock-generation-and-distribution/ad9508/products/product.html.
On the AD9508 Evaluation Board page, double-click AD9508Eval_Setup1.1.0.exe. (Note that the website may have a newer version.) Follow the installation instructions.

Running the Software

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

Windows® may automatically detect the evaluation board after the board is first plugged in. Allow Windows® to install the device drivers.

Figure 2. Device Hardware Installation
Double-click AD9508 Evaluation Software to run the AD9508 software. If the evaluation board was found by the software, the lower left hand corner of the Main Window (shown in Figure 4) will read “AD9508 Evaluation Board” in green. If the evaluation board was not found, the lower left hand corner of the screen will read “No Hardware Connected!” in red.
If the evaluation board is found, proceed to the Evaluation Software Components section for details about running the software. If the evaluation board is not found, click File > Select Hardware. Select the appropriate AD9508 evaluation board connected and press OK.

Figure 3. Select Hardware Window

The bottom left corner of the main window should now read AD9508 Evaluation Board in green. Alternatively, you can use the software in standalone mode. The standalone mode is useful for verifying register settings for a given setup. See the Evaluation Software Components section for a description of the evaluation software features.

EVALUATION SOFTWARE COMPONENTS

Main Window

Figure 4. Evaluation Software Main Window

The AD9508 evaluation software is composed of subsections that correspond to the major functional blocks of the AD9508. These subsections are listed in the following sections of the user guide. Some of the major subsections have a dedicated window that allows the user to edit the register settings associated with the functional block. A functional block window can be accessed by clicking the appropriate button under each block. Some of the functional blocks have editable text areas that can be accessed and altered without opening each functional block window. Altering these text areas changes the settings found in the various block windows and immediately loads the change into the evaluation board. Conversely, editing the settings within a block will be reflected in a text area.

After clicking LOAD, the settings from that subwindow are loaded to the evaluation board. When editing a text box within the main window, ENTER must be pressed before a change is saved and loaded into the evaluation board.

Input Receiver

The Input Receiver section allows the user to select between single ended and differential operation. By clicking on the MUX symbol within the block, the software will highlight which path is active.

Figure 5. Input Receiver Section*
*The left image shows default differential operation of the input receiver. The right image shows single ended operation.

Output Distribution

The Output Distribution section allows the user to alter divide ratios and phase offsets for each output of the AD9508. Each divide and phase block can be edited by typing the preferred value within the block followed by ENTER. Once enter is pressed, the values are loaded into the evaluation board. The phase offset blocks accept the prefixes u (micro), p (pico), and n (nano). Phase offset is limited to one half of the period of the input clock rate. Each divider supports integer divide values from 1 to 1024. If the typed value is not realizable in the current configuration, the software will automatically round to the nearest possible solution. The output distribution section is shown in Figure 6.

Figure 6. Output Distribution Section

Pressing the DIST REGISTERS button at the bottom of the Output Distribution section allows the user to access all of the distribution register settings in the Distribution Settings Window.

Figure 7. Distribution Settings Window

The Distribution Settings Window consists of four individual tabs for each output channel. Each tab contains controls for each channel divide ratio, phase offset, driver mode, polarity and power down settings. To load any of the settings to the evaluation board changed within the Distribution Settings Window, the user must press the Load button.

The Driver Mode and Polarity settings are altered by selecting one of the values in each drop down tab and pressing the Load button. To power down a channel driver, the appropriate Channel Power Down box must be checked.

Operational Controls Window

The Operational Controls Window is opened by pressing the CONTROL button at the bottom of the Main Window. This window contains controls for SPI, LDO voltage control, channel power down, sleep mode, and two buttons for Soft Reset and Soft Sync. The Operational Controls Window is shown in Figure 8.

Figure 8. Operational Controls Window

Register Map Window

The Register Map window is accessed by pressing the REG MAP button at the bottom of the main window. Figure 9 below shows the Register Map Window.

Figure 9. Register Map Window

The Register Map window contains two tabs. The All tab displays all of the registers that can be changed through the AD9508 evaluation software. Each register can be selected by clicking the various blue boxes shown in Figure 9. Register details for the selected register will appear at the bottom of the window. These details include the name of the register, the current register value, and the various bit fields for the register. The Changed tab contains all of the registers that have been modified from within the AD9508 evaluation software but not loaded into the evaluation board yet. These same registers are also highlighted in the All tab as they are modified.

Read All and Write All Buttons

The Read All and Write All buttons are located at the bottom of the Main Window. The Read All button reads all of the register values currently stored in the chip and transfers them to the evaluation software. The Write All button transfers all of the register values currently loaded into the software and writes them to the chip.

Reset Button

The Reset Button is located at the bottom of the Main Window. This button resets the part to its default register settings, which is also reflected in the Main Window.

SYNC Button

The SYNC Button issues a soft synchronization command which synchronizes all outputs that are not omitted by the appropriate SYNCMASK bit. Please refer to the AD9508 datasheet for more information about the SYNC command

EVALUATION SOFTWARE MENU ITEMS

Figure 10. Menu Bar

File Menu

The File menu includes the following options:

Load Setup
Selecting Load Setup loads a previously saved AD9508 setup file (.stp). A setup file is a text file that contains the AD9508 register setup file, plus any evaluation board settings.

Save Setup
Selecting Save Setup saves an AD9508 setup file (.stp). A setup file is a text file that contains the AD9508 register settings, plus any evaluation board settings.

Select Hardware
The AD9508 evaluation system allows one PC to control multiple evaluation boards. This window allows you to select which evaluation board the software is controlling. Click Refresh List to detect a recently connected evaluation board.

Figure 11. Select USB Device Window

Options (Enable Polling and Polling Interval
Polling allows the user to define how often the software checks for changes made to the register values on the AD9508. Polling also checks for a hardware connection, which updates in the lower left hand portion of the main window. Polling Interval sets the length of time in-between each software check. The default interval is 1second. Figure 12 shows the Polling Interval selection window.

Figure 12. Polling Interval Window

Exit
Exits the evaluation software. No checking is performed to ensure that the existing setup is saved.

View Menu

The View menu includes the following options:

Register Map
Opens the Register Map Window. See the Register Map Window subsection in the Evaluation Software Components Section.

Debug
The Debug Window allows the user to read the values that are loaded into the various register addresses as well as manually load values into each register address of the AD9508 on the evaluation board. Figure 13 below shows the Debug window. Detailed information about the usable registers and their functions can be found in the AD9508 datasheet.

Figure 13. Debug Window

About Menu

Selecting About opens the AD9508 window, which contains information about the version of the evaluation board software.

Wiki

Analog Devices Wiki

Table of Contents

AD9508 Evaluation Board User Guide

GENERAL DESCRIPTION