特性
- Four internal PLLs
- Internal non-volatile EEPROM
- Fast (400kHz) mode I2C serial interface
- Input frequency range: 1 MHz to 200 MHz
- Output frequency range: 4.9 kHz to 200 MHz
- Reference crystal input with programmable linear load capacitance - Crystal frequency range: 8 MHz to 50 MHz
- Four independently controlled VDDO (1.8V - 3.3V)
- Each PLL has a 7-bit reference divider and a 12-bit feedback-divider
- 8-bit output-divider blocks
- Fractional division capability on one PLL
- Two of the PLLs support spread spectrum generation capability
- I/O Standards: - Outputs - 1.8 - 3.3 V LVTTL/ LVCMOS - Inputs - 3.3 V LVTTL/ LVCMOS
- Programmable slew rate control
- Programmable loop bandwidth
- Programmable output inversion to reduce bimodal jitter
- Redundant clock inputs with auto and manual switchover options
- Individual output enable/disable
- Power-down mode
- 3.3V core VDD
- Available in VFQFPN package
- -40 to +85 C Industrial Temp operation
描述
The 5V49EE904 is a programmable clock generator intended for high performance data-communications, telecommunications, consumer, and networking applications. There are four internal PLLs, each individually programmable, allowing for four unique non-integer-related frequencies. The frequencies are generated from a single reference clock. The reference clock can come from one of the two redundant clock inputs. Automatic or manual switchover function allows any one of the redundant clocks to be selected during normal operation. The 5V49EE904 is in-system, programmable and can be programmed through the use of I2C interface. An internal EEPROM allows the user to save and restore the configuration of the device without having to reprogram it on power-up. Each of the four PLLs has an 7-bit reference divider and a 12-bit feedback divider. This allows the user to generate four unique non-integer-related frequencies. The PLL loop bandwidth is programmable to allow the user to tailor the PLL response to the application. For instance, the user can tune the PLL parameters to minimize jitter generation or to maximize jitter attenuation. Spread spectrum generation and/or fractional divides are allowed on two of the PLLs. There are a total of six 8-bit output dividers. The outputs are connected to the PLLs via a switch matrix. The switch matrix allows the user to route the PLL outputs to any output bank. This feature can be used to simplify and optimize the board layout. In addition, each output's slew rate and enable/disable function is programmable.
当前筛选条件
加载中
筛选
软件与工具
样例程序
模拟模型
Description
This video provides an overview of IDT's VersaClock® 3 and VersaClock LP product families. VersaClock programmable clock generators allow designers to save board space and cost by replacing crystals, oscillators (including programmable oscillators), and buffers with a single timing device. IDT's VersaClock product portfolio contains parts with up to four internal PLLs, each individually programmable, allowing for up to seven unique frequencies. Various subsets of the VersaClock family are targeted for different applications. For high-reliability systems, the VersaClock III family supports glitchless automatic or manual switchover function allowing the redundant clock to be selected during normal operation. For consumer systems, VersaClock III and LP (low power) provide flexibility with an internal EEPROM that makes it simple to reprogram frequencies for changing system requirements through the use of the I2C interface. Presented by Baljit Chandhoke, Product Marketing Manager at Integrated Device Technology, Inc. To learn more about Renesas's VersaClock programmable clock generators, visit our Programmable Clocks page.
Transcript
Hello, My name is Baljit Chandhoke and I'm Product Marketing Manager of Timing Products at IDT. Today, I'll be giving you a brief overview of IDT VersaClock III and VersaClock Low Power Programmable Clock families.
IDT VersaClock products are programmable devices that save cost, reduce board space and greatly increase flexibility in consumer communications networking applications. VersaClock devices are highly configurable and can be programmed through the use of I2C interface. These devices are ideal for designs that need multiple different clock frequencies, quick time to market, low board space and BoM cost. Using IDT's spread spectrum techniques, VersaClock products are also an inexpensive and effective way to reduce EMI for FCC certification. IDT's VersaClock family contains parts with up to four internal PLL's, each individually programmable, allowing for up to seven unique frequencies. Various subsets of VersaClock families are targeted for different applications. For low powered battery application, VersaClock LP has exceptionally low power consumption while maintaining great performance. VersaClock III will be used in high-end consumer applications, industrial applications and our system clock for communication applications.
As you see in the block diagram, there are six different crystals. All these crystals can be replaced with a single crystal and VersaClock III from IDT. The benefits of the solution are reduced board space, reduced bill of material, low cost, as well as capability to change frequencies on the fly. In addition, as you know, crystals have lower reliability, so when we reduce the number of crystals from six to one, we are increasing the overall reliability.
Key applications of VersaClock are high-end consumer, industrial, communications, instrumentation, medical and battery-powered devices. As you can see, there are numerous application issues solved by VersaClock family of products.
As you see in the block diagram, there are four internal PLL's, each individually programmable, allowing for four unique non-integer related frequencies. The frequencies are generated from a single clock reference. The reference clock can come from one of the two redundant clock inputs. Automatic or manual switch over function allows any one of the redundant clocks to be selected during normal operation. The devices are in system, programmable and can be programmed through the use of I2C interface. An internal double-eprom allows the user to save and restore the configuration of the device without having to reprogram it on power up.
As you can see, there are many benefits and features of the VersaClock III family of products which are summarized on this slide.
We have devices all the way from five outputs to nine outputs with LVCMOS output, LVPECL output, LVDS output and HCSL outputs in different packages, as shown on this table.
We also have family of devices with VCXO input, which enables you to program the output frequency depending on the voltage applied at the input.
Now, I'll talk about the VersaClock Low Power family of devices. VersaClock Low Power devices are programmable clock generators intended for low-powered, battery-operated consumer applications. There are four internal PLL's, each individually programmable allowing for up to eight different output frequencies. The frequencies are generated from a single reference clock. The reference clock can come from either a TCXO or a fundamental mode crystal. An additional 32-kilohertz crystal oscillator is available to provide a real time clock or noncritical performance mega hertz processor clock.
The key benefits and features of this family are summarized as shown on this slide.
The different device options that we offer are show on the slide with five outputs all the way up to eight outputs and 20-pin package to 28-pin package.
In summary, IDT VersaClock Programmable devices are ideal clocking solutions for a wide range of applications. They can be used to replace crystal oscillators, VCXOs, Clock IC's. They enable our customers to improve time to market, which shorten design times as well as allowing for in-system programming and system margining. VersaClock family of products save BoM cost and board space.
IDT provides a complete product support for VersaClock family of products, which include software GUI, user's manual, evaluation board, datasheets, application notes, instructional videos as well as reference designs. For more information, please go to the link shown on the screen. Thank you for your time.
Description
This video provides an overview of IDT's VersaClock® 3 and VersaClock LP product families. VersaClock programmable clock generators allow designers to save board space and cost by replacing crystals, oscillators (including programmable oscillators), and buffers with a single timing device. IDT's VersaClock product portfolio contains parts with up to four internal PLLs, each individually programmable, allowing for up to seven unique frequencies. Various subsets of the VersaClock family are targeted for different applications. For high-reliability systems, the VersaClock III family supports glitch-less automatic or manual switchover functions allowing the redundant clock to be selected during normal operation. For consumer systems, VersaClock III and LP (low power) provide flexibility with an internal EEPROM that makes it simple to reprogram frequencies for changing system requirements through the use of the I2C interface. Presented by Baljit Chandhoke, Product Marketing Manager at Integrated Device Technology, Inc. To learn more about Renesas's VersaClock programmable clock generators, visit the Programmable Clocks page.
Transcript
Hello. Today I'm going to be providing an introduction to the VersaClock III family of programmable timing solutions from IDT, an introduction to how to download our software, use our software, and using our evaluation boards, as well as socket daughter cards for programming loose parts on your bench.
The VersaClock III family of programmable devices is our third generation family, providing improved jitter performance, lower power consumption, availability of single-ended as well as differential output frequencies and provides increased user flexibility using our software interface.
Our VersaClock III family actually has a dedicated website on IDT.com. The way to get there is to type in www.idt.com/go/versaclock3. From this website, you can see we have all information related to the VersaClock III family. We have brief descriptions, the feature sets available, all of the product matrices involved including our crystal oscillator as well as VCXO solutions, and all of the data sheets, by clicking on the links of the part numbers. Scrolling down the page, you will see our software downloads, user manuals, as well as product collateral, such as our press release, as well as the product flyer. To download the software it is free for all users. All you need is a myIDT account name and password. This is easily attainable from IDT.com. To download the software, simply click on the link, and the pop-up box prompts you. Click "Open" and the software will automatically begin downloading. There are two versions of the software. One is connected to our server at IDT.com. The other is available for use strictly on your computer if you're not connected to the internet. For that version, I suggest clicking on the second link, and following the same instructions of opening when the pop-up box prompts you.
After the software is downloaded, an icon will appear on your desktop, and it will also be available in your programs menu. To open the software, all you do is double-click on the icon, and a pop-up box will appear.
You'll see that there are two options; one is called local, one is called remote. The local is the desktop version that you downloaded, so if you're not connected to the internet, I suggest clicking “Local.” From here, all you would need to do is click “OK.” If you want to use the version that's connected to our server, all you need to do is click on remote, and enter your myIDT username and password, and click OK.
Next, the VersaClock III software menu pops up. You'll see that there are two options available. One is to start a new session, which is this link here. The other is to open a previous session or programming file that you've already created and want to modify. Today we'll focus on introducing a new programming file, so I'll click on this link. As you see, a pop-up box appears that shows all of the part numbers available using the software interface, as well as a brief feature set of each product, and the package and pin-out. Today, we'll choose to program a 5V49EE701 7-output VersaClock III clock synthesizer. So scroll down the list and you'll see that all of the part numbers are available in the VersaClock III family. Choose the product that you'd like to create a programming file, and hit “Continue.”
Next you will see the general interface for the VersaClock software. We have text fields along the top where you can enter information related to your company, so today I'll be typing “ABC company,” as well as the operator, the person creating the programming file. Also available is a notes field, so if you want to tag which project this programming file will be used for, for example, “Project A.” Also you will see a part number field that's automatically populated for the part number that you've selected, as well as a file name. The VersaClock software automatically attaches a file name to the programming file that you're working on. You see that the part number, the package, as well as the date and time stamp. You also have the ability to name the file exactly as you want by hitting "Save As" and renaming the file. Next, you'll want to enter the input frequency and output frequencies desired from this device. You'll see here, we have a drop-down menu of all common input frequencies. If you select “25,” for example, to use as an input frequency, as either a clock or crystal input. You also have the ability to manually type in any frequency that you'd like. For the example today I will choose 25 MHz input.
Next, what you'll want to do is type the desired outputs. So I'll type 25 MHz reference output, 100 MHz, 100 MHz, 27 MHz, 74.25 MHz, as well as 48 MHz. You'll see that there is also an input field for error ppm. This is available if you want to enter the tolerance or the ppm error for each clock output. Remember that you also have to take into account the error budget of the input frequency. For example, if you're using a +/- 50 ppm crystal, you'll have to account for that in the total error ppm budget. Once you've entered in all of your output frequencies desired, simply hit "Calculate," and the software will automatically configure the PLLs in the chip to optimize for jitter performance and power consumption.
You will see that the software came up with a zero ppm synthesis error solution for each of the frequency outputs that we have entered.
The VersaClock III family also has the ability to do a differential pair output. In order to do this, we will demonstrate. For example, if you wanted a 100 MHz differential pair, we’ve entered two single-ended frequencies of 100 MHz to begin with. Next, all you would need to do is click on "View," "Detailed view," which shows the highly flexible user interface to programming each individual PLL, VCO, loop parameter, and output dividers. We'll go into the details of using detailed view in a later video. Today for simplicity, we're just covering an introduction to the manual configuration view. If you scroll to the right, you'll see that each of the outputs that we've calculated are here. Over to the right you'll see each of the output levels associated with those frequencies. For the two 100 MHz that we would like to compare together to be a differential output, we will simply click on the down box next to the 100 MHz output and choose the level that we would like. For this example, we'll choose HCSL for a PCI-express gen one pair.
From here, all you would need to do is go back to the single configuration view, and the two 100 MHz outputs are now combined together for a differential pair. You will also see a note in red font at the bottom of the screen indicating that you have changed this output in the detailed view. On the right-hand side of the screen, you will see the pin-out of the part, as well as where the frequencies are located on each of the output pins. You will see that the 25 MHz output is highlighted in blue font. This indicates that the output is a reference frequency from your input of 25 MHz. The software also gives you the ability to force that through a PLL instead of a true reference output. In order to do that, simply click this box under "use PLL" next to the 25 MHz output.
Next we will show you how to add spread spectrum to an output in the VersaClock software. There are two PLLs with spread spectrum capability in this VersaClock III family. In the software you have the ability to choose which frequency to apply spread spectrum to, as well as the modulation frequency associated with each of those. All you would need to do is type in the spread modulation rate that you'd like from the PLL. Anywhere from 32 kHz up to 120 kHz. Next you can choose the direction of the spread spectrum, either down spread or center spread. Since we know that we have a 100 MHz PCI-express, we would like to choose down spread of half a percent.
Next, we'd like to choose which output to apply these spread spectrum criteria to. So for the 100 MHz outputs, we click on the boxes under A. This applies spread spectrum that we've defined for spread spectrum PLL A to the 100 MHz outputs. Next, we'll hit "calculate" to add that spread spectrum to the 100 MHz output. The software reconfigures each of the PLL parameters with the updated spread spectrum configurations as well as the input and output frequencies we've previously defined.
Here we see that the outputs now appear in magenta color. This indicates that spread spectrum is applied to those outputs. You can also see that over here in the pin mapping section of the user interface. Remember that we also forced the 25 MHz through a PLL instead of giving a reference output. You will see that the 25 MHz now appears in black color indicating that it is not a reference output any more.
Also on screen you will see that the software has estimated the power consumption of this configuration to be 86 mA. You also see that the modulation rate of 32 kHz and -0.5% down spread is applicable in this setting. Also available in this family of devices are configuration settings. There are 6 configuration settings in each of the VersaClock III products. Here, you can see each of the configurations along the top, which are programmable through hardware select pins noted here. For example, we have already used configuration zero to come up with this sequence of input and output frequencies. By clicking on configuration one, you are able to program the chip with a completely different set of input and output frequencies, effectively generating multi-programs, for different projects, in one piece of silicon.
Another feature of this device is using configurations to do frequency selections or different spread amounts. To demonstrate that, I will click on this button here, which allows you to populate different configurations from previous ones already calculated. For example, for configuration one, if I want to turn spread off on that 100 MHz signal, all I would do is copy from register zero, click “OK,” and all of the information is transferred into configuration one. To turn off spread in this configuration I just un-click the boxes under A, and hit “Calculate.” As you can see, the software has re-calculated with spread turned off. By clicking between zero and one, you can see the difference. Also note that the hardware select pins are changing as well. So, by tying hardware select pin zero hide, you are effectively making spread turn off on the 100 MHz outputs.
To program the device on the evaluation board, all you need to do is plug in the evaluation board to a USB port on your computer. The board registers and is plugged in when you see the red LED light. To program the device on the board, all you would need to do is go to the settings menu, highlight "port," and ensure the VersaClock III is highlighted in the port. Click “OK,” and then "Program Part," in the software user interface. The software has successfully programmed the part on the evaluation board.
You can also use the evaluation board to program loose parts on your bench. In order to do so, all you need to do is remove the pins from the header on the evaluation board, and plug in the appropriate socket for the package of the product that you are using. From there, plug the evaluation board back into your computer, and hit "program part" just as you did for the evaluation board.
That concludes our introduction to the VersaClock III family of programmable timing solutions, the software download, using the manual configuration, using the evaluation board as well as our daughter cards for programming loose parts. Thank you for joining us, and tune in soon for our in-depth training, using the detailed view of the VersaClock software.