Texas Instruments CDCE72010 Manuale utente

User's GuideSLAU250 – May 2008

1.5-GHz Low-Phase Noise Clock Evaluation Board

This user's guide discusses the general operation and configuration of the Texas Instruments CDCE72010evaluation board.

Contents1 Features ....................................................................................................................... 22 General Description ......................................................................................................... 23 Signal Path and Control Circuitry ......................................................................................... 34 Software Selectable Options .............................................................................................. 35 Installing the GUI Interface and USB Driver ............................................................................. 36 CDCE72010 Control GUI Interface ....................................................................................... 57 TI CDCE72010 Control GUI Interface .................................................................................... 57.1 Using Software-Enabled PLL Selection .......................................................................... 58 Configuring the Board ..................................................................................................... 108.1 Default Configuration for Programming and Testing With USB Cable Attached .......................... 108.2 Configuration for Programming With USB Cable Attached .................................................. 108.3 Configuration for Testing From a Saved Configuration With USB Cable Removed AfterProgramming ....................................................................................................... 108.4 Configuration for Onboard External Loop Filter ............................................................... 118.5 Configuration for PLL Lock Detect .............................................................................. 129 CDCE72010EVM Board Schematic Diagram .......................................................................... 13

List of Figures

1 CDCE72010EVM Board .................................................................................................... 22 CDCE72010EVM External Loop Filter Topology ....................................................................... 12

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1 Features

2 General Description

Features

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•Easy-to-use evaluation board to generate low-phase noise clocks up to 1.5 GHz•Easy device programming via host-powered USB port•Fast configuration through provided graphical user interface (GUI) software interface•Total board power provided either through USB port or separate 3.3 V and ground connections.•Single-ended or differential input reference clock•Crystal filter on output readily available for clocking high-speed analog-to-digital converters, if needed.

Figure 1. CDCE72010EVM Board

The CDCE72010 is a high-performance, low-phase noise clock synchronizer and jitter cleaner. It has onemain universal VCO/VCXO input buffer and an auxiliary universal input buffer. Either Input can drive theoutputs and/or the feedback path to the PFD. The maximum VCXO/VCO input frequency is 1.5 GHz. Itprovides support for two redundant input references and using its on-chip PLL architecture can provide upto ten differential or 20 single-ended low jitter outputs.

The CDCE72010 supports two reference inputs, which can be differential or single-ended. It also providestwo VCXO inputs, which can drive up to ten outputs.

The CDCE72010 then can be programmed through the SPI interface using the evaluation module (EVM)programming GUI.

The evaluation module (EVM) is designed to demonstrate the electrical performance of the device.

This fully assembled and factory-tested evaluation board allows complete validation of all device functions.

For optimum performance, the board is equipped with 50- ΩSMA connectors and well-controlled 50- Ωimpedance microstrip transmission lines.

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3 Signal Path and Control Circuitry

4 Software Selectable Options

5 Installing the GUI Interface and USB Driver

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Signal Path and Control Circuitry

The CDCE72010 provides support for selectable tri-inputs, and two of the inputs (PRI REF and SEC REF)can accept a 8-kHz to 500-MHz frequency input from a differential signal source or a 8-kHz to 200-MHzfrequency input from a single-ended signal source.

The CDCE72010 provides support for up to ten differential (LVDS or LVPECL) or 20 single-ended(LVCMOS) or any combination of outputs up to 1.5 GHz. On the CDCE72010EVM, output 1 and output 8have a footprint option for installing crystal filters that can drive the phase noise floor down by 10 dB or 15db. This filtered signal is intended to be used for clocking high-performance, high-speed analog-to-digitalconverters (ADC).

The CDCE72010 requires an external loop filter. The loop filter selection determines the PLL loop stabilityand also affects the phase noise of the output. The EVM provides four sets of filters optimized for a30.72-MHz reference and 491.52-MHz VCXO. For any output of the CDCE72010, the frequency isdetermined by the selection of the VCO/VCXO and the setting of the output divider. The output jitterperformance is determined by the PLL settings (including the PFD frequency, charge pump current, andthe loop filter). See the CDCE72010 data sheet for more details and configuration settings.

Each of the ten outputs of the CDCE72010 can be selected through the software interface as LVPECL,LVDS, or LVCMOS. The CDCE72010EVM provides software selectable 150- Ωcurrent-setting resistors.

The LVCMOS outputs work for frequencies up to 250 MHz; the LVDS outputs run up to 800 MHz; andLVPECL outputs function up to 1.175 MHz (these are all minimum frequencies).

The provided GUI software allows users to easily send commands to the CDCE72010 through thehost-powered USB interface. The EVM includes a slave USB controller that transmits the commands tothe SPI programming interface included on the CDCE72010. The DC power for the USB controller caneither be derived from the 5-V power pin in the USB cable or by using an external 5-V DC adapter into theslot available on the EVM. If the device is accessible for programming by the SPI programming interfacethrough the USB controller, the onboard LED D25 is illuminated on power up.

In addition to writing commands to the CDCE72010 RAM while the board is powered, commands also canbe stored in CDCE72010 EEPROM. This allows users to start the EVM in the desired state withoutneeding programming at power up.

Note that the CDCE72010 has a permanent EEPROM lock mode. After this mode is selected, theEEPROM within the CDCE72010 cannot be changed. This is useful when setting final configurations.

The CDCE72010EVM software also provides support for the device GUI configurations to be saved into aconfiguration file, which can be opened at a later time with this GUI.

To start installation, run the CDCE72010 Control GUI v1.X.X.msi file.

Make note of the installation folder because you may need to refer to it when the USB cable is connectedand asks for the location of a driver file.

After the setup wizard has completed, start the GUI interface from the start menu (Start →CDCE72010Control GUI).

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Note program file location as the

USB controller driver is in the

same location!

Installing the GUI Interface and USB Driver

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Connect the USB cable to the EVM. If The Windows™ operating system asks for an appropriate driver, donot use the automatic search option. Select a manual installation, and when prompted for the driverlocation, browse to the CDCE72010 GUI file folder that was used during instillation. If the Windowsoperating system does not ask for a driver, no action is required.

After the USB driver installation, the GUI software must connect properly and be ready for use. A greenlight in the USB Status and SPI Bus Status boxes indicates good USB connection, and a red lightindicates faulty USB connection or faulty SPI bus.

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6 CDCE72010 Control GUI Interface

7 TI CDCE72010 Control GUI Interface

7.1 Using Software-Enabled PLL Selection

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CDCE72010 Control GUI Interface

The illustration in the software shows the block diagram of the CDCE72010. In this illustration, the usercan change the Input Frequency, Input Divider, Input type, Input selection, PFD Charge Pump, OutputDivider, and Output type. The rest are selected by the software with user-selectable options as describedin the steps below. If the power to the CDCE72010 is derived from the USB, the Enable EVM Powerbutton needs to be checked. If the power to the CDCE72010 is derived from an external source, theEnable EVM Power button needs to be unchecked.

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TI CDCE72010 Control GUI Interface

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Step 1: External Control Pins SelectionBefore programming the PLL, select the External Control Pins button in the EVM Status section of theGUI. The selections on this popup window, as shown in the following illustration, must be selectedaccording to the desired working configuration of the CDCE72010.

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TI CDCE72010 Control GUI Interface

Step 2: Primary/Secondary Reference Input SelectionThe primary or the secondary reference input buffer section on the GUI can be clicked for a popup windowthat opens up, as shown in the following illustration. This illustration shows selections on the external inputsignal type (differential or single ended), the external signal connection to the CDCE72010primary/secondary inputs (AC or DC termination), input buffer internal termination (enabled or disabled),input buffer VBB voltage polarity (normal or inverted), input buffer hysteresis, and fail-safe mode (enabledor disabled).

Step 3: Reference Input Selection through Smart MUXThe Smart MUX section of the GUI can be clicked for a popup window that opens up as displayed in thefollowing illustration, showing selections of Primary, Secondary, Auto ( with Primary preference), andNone.

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TI CDCE72010 Control GUI Interface

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Step 4: PFD and Charge Pump SelectionThe PFD and Charge Pump section of the GUI can be clicked for a popup window that opens up. Thefollowing illustration shows selections on the charge pump current and charge pump pulse width.

Step 5: Output DividerThe CDCE72010 has 10 outputs and 8 Output Dividers. Outputs 0 and 1 share the same divider, andoutputs 8 and 9 share the same divider. The Output Divider and the Output Phase Adjust are accessed byclicking on the divider needed.

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TI CDCE72010 Control GUI Interface

Step 6: Output Type SelectionThe Output Buffer section of the GUI for each of the five outputs can be clicked for a popup window thatopens up, as displayed in the following illustration. For each output clock source, the user can selectLVPECL, LVPECL High Swing (in which cases the output 150- Ωtermination is automatically enabled),LVDS, LVDS High Swing, or LVCMOS. In CMOS mode, the P and N outputs become separate CMOSoutputs running at the same frequency. Either CMOS output can be active, inverting, tri-state or low. Eachoutput can be independently disabled.

Step 7: Write to CDCE72010 EEPROMTo write any particular setting to the EEPROM (locked or unlocked), the menu item at the top of the GUIentitled Tool must be clicked which reveals the items Write EEPROM Unlocked and Write EEPROMLocked as part of a drop-down menu. Choosing the appropriate one after setting the desired PLLconfigurations results in writing to the EEPROM in the selected mode.

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8 Configuring the Board

8.1 Default Configuration for Programming and Testing With USB Cable Attached

8.2 Configuration for Programming With USB Cable Attached

8.3 Configuration for Testing From a Saved Configuration With USB Cable Removed

Configuring the Board

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The CDCE72010EVM can be powered from the USB power supply or from an external source. TheCDCE72010EVM only needs a USB cable attached for programming purposes. However, for testmeasurements, it is recommended to also use an external 3.3-V power supply. Test measurements alsocan be taken with only the USB-supplied power. However, due to USB port power limitations, results maydegrade. It is also possible to program the CDCE72010 and then disconnect the USB cable (may requireminor board configuration changes).

The CDCE72010EVM is configured by default to operate with the USB cable attached and a 3.3-V powersupply added to EXT VDD and GND. In this configuration, the USB microcontroller is powered by the USBport’s 5-V supply whereas the CDCE72010 is powered by the 3.3-V external supply. This setup is optimalfor programming the CDCE72010 while also taking measurements. This configuration removes the powervariation found in USB power supplies by isolating the CDCE72010 from the USB supply.

The CDCE72010EVM can use power supplied through the USB cable as its sole power source. However,due to power supply variances in the USB supply, this configuration is not recommended formeasurements. This setup is for saving configuration settings to the CDCE72010 and later powering thedevice from its internal memory (useful if a USB port is unavailable in a laboratory or test chamber). In thisconfiguration, JP_3_3 must be moved from its default position to the new position shown in the followingillustration. Also, the Enable EVM Power box must be checked on the EVM GUI interface software.

After Programming

When operating the CDCE72010 without the USB programming cable (useful in laboratory settings inwhich a PC is unavailable at the laboratory station), the CDCE72010 needs to be configured and saved inthe EEPROM in one of the preceding configurations and then reconfigured for external power supplyusage.

Prior to making these board modifications, the CDCE72010 settings must be saved with one of the USBcable attached configurations. The Write EEPROM Unlocked or Write EEPROM Locked software buttonmust be used to save the CDCE72010 to its internal EEPROM. After the settings are saved to EEPROM,the USB cable can be removed. Once the cable has been disconnected, JP_3_3 must be in the UsingExternal 3.3V Supply position (as seen in the preceding diagram). The EVM now is ready for use withoutthe USB cable connected. The CDCE72010 always starts from its saved configuration state in this mode.

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