Clocks & Timers

Browse by Tags

Clocks & Timers

Welcome to the Clocks & Timers Section of the TI E2E Support Community. Ask questions, share knowledge, explore ideas, and help solve problems with fellow engineers. To post a question, click on the forum tab then "New Post".

Sign In to Post
Tags
You have subscribed to this tag. To view or manage your tag subscriptions, click here.   Close
You have unsubscribed from this tag. To view or manage your tag subscriptions, click here.   Close
You are currently viewing:
CDCE913
Related Posts

  • Forum Post: Re: Clock Doubler?

    Justo
    Hi Steve, TI has the CDCE913 that is a programmable PLL. So you can program it via I2C or programm the EEPROM in order to set the x2 fatcor. In terms of straight multiplication we have the CDCS503 that multiplies x4 and also it can add SSC if needed. No siimple x2 though. Hope this helps...
    on Apr 1, 2010

  • Forum Post: CDCE62005 LVCMOS TERMINATION PROBLEM

    Rolan Tang
    THE Application Report SCAA096 tell us when the ref input and output is LVCMOS, a 1K pull up resistor and 1K Pull down resistor are used, I wonder if they are really needed? I think series resistor is more improtant.
    on May 5, 2010

  • Forum Post: Re: Reprogramming PLL when it provides CPU clock

    mapefer3
    The CDCE706 allows changing programmatically the output frequency via I2C, but to change from Frequency1 to Frequency2 avoiding intermediate frequencies or glitches, is not as straight forward as using the CDCE925, CDCE937, CDCE949, CDCE913. If in order to change from Frequency1 to Frequency2 only...
    on May 28, 2010

  • Forum Post: Re: Block Read on I2C bus of CDCE913

    mapefer3
    Prior to a block read, the BCOUNT has to be set to the number of bytes to be read back. It might be possible that the BCOUNT is not set correctly or that the BCOUNT is set to a greater value than the bytes available form the offset set on the command code. On the top of page 8 of the application...
    on Jun 26, 2010

  • Forum Post: Block Read on I2C bus of CDCE913

    Yue Zhu
    Hello Everyone, If anyone has tried out block read for register readout of CDCE913 PLL chip. I cannot get it work. My situation is: the byte write , byte read and block write are OK, meaning i2c works fine (SCL 11kHz). I take the programing sequence suggested by Datasheet (page12) also for...
    on Jun 25, 2010

  • Forum Post: Re: CDCE913 pullability - no hint that it's working....

    mapefer3
    In the datasheet of the XTAL you mentioned, the CL=18pF and the shunt capacitance is C0=7pF. +/-40ppm is the pulling range of the chosen XTAL calculated with the Pulling range tool included in the TI clock pro ( http://www.ti.com/litv/zip/scac119 ). You can find recommended XTALs to use the...
    on Jul 16, 2010

  • Forum Post: Re: CDCE913 pullability - no hint that it's working....

    mapefer3
    In the datasheet of the XTAL you mentioned, the CL=18pF and the shunt capacitance is C0=7pF. +/-40ppm is the pulling range of the chosen XTAL calculated with the Pulling range tool included in the TI clock pro ( http://www.ti.com/litv/zip/scac119 ). You can find recommended XTALs to use the...
    on Jul 16, 2010

  • Forum Post: Re: CDCE913 pullability - no hint that it's working....

    ivomarocco
    Dear Mr. Walthinsen, thank to your feedback we were able to spot a typo into the application note scaa085. C1 must be actually bigger than 20 femto Farad and not pico Farad. This will be corrected in pag.4. If you need to "pull" your frequency of a certain amount of ppm, you will...
    on Jul 19, 2010

  • Forum Post: Re: Can I use CDCE913 to synchronize many DIR9001s?

    mapefer3
    Hi Po-Cheng, Apologies for the late response, answering your question the CDCE913 would present low skew if all outputs share the same frequency and are connected to the same divider set to 1. With the CDCE913 provides up to 3 outputs, this device belongs to a family of clock generators with up to...
    on Jul 28, 2010

  • Forum Post: Re: CDCE913 Jitter Problem

    mapefer3
    It might be a signal integrity issue. How is the jitter being measured? Are you measuring the jitter at the output of the CDCE913 when is driving the video decoder circuit with and without Vctr? How does the clock output looks like? Would it be possible to get some screenshots of the CDCE913 output...
    on Oct 22, 2010

  • Forum Post: Re: CDCE913 Jitter Problem

    Rob Froyd
    1) We are using the CDCE913 as a VCXO. 2) We understand setting register 1 for XTAL or VCXO. 3) Our Jitter Performace is fine if we set the CDCE913 to XTAL mode. This expirement, we believe points to a problem at the CDCE913. 4) With the Crystal we have selected, and then pulling the VCTR manually...
    on Oct 23, 2010

  • Forum Post: Re: CDCE913 Output Problem

    mapefer3
    The CDCE913 has internal capacitors that you can program to match the crystal load specified by the XTAL datasheet. Therefore you might not need the external caps C80 and C81 that currently are in your schematic. That will fine tune the frequency of oscillation according to the pullability of the XTAL...
    on Nov 30, 2010

  • Forum Post: Re: CDCE913 Output Problem

    Kate Xu
    Hi Thanks for your help. I adjusted the crystal load and that's ok. Another problem, can I write 8 different setups for 8 output selection into the EEPROM at the same time? I'm going to use external control pins to select 8 different output and how should I save the predefined values...
    on Dec 7, 2010

  • Forum Post: CDCE913 Not Responding to I2C Command Interface

    bfsystems
    I am pulling my hair out trying to get a PIC MCU (18F46J50) to communicate with a CDCE913. The I2C bus transfers appear to be working (looking at a scope), but the TI device isn't responding functionally as it should. It appears to be stuck in the default power-up configuration, which is passing...
    on Jul 23, 2010

  • Forum Post: CDCE913 Output Problem

    Kate Xu
    Dear All, I've got a problem with CDCE913 output. The output frequency of CDCE913 doesn't equal the value I set and expect by setting EEPROM registers. There is one 27Mhz Crystal(DSX530GA-27.000MHZ) in my design, and I select VCXO as clock input to use PWM signal to control CDCE913. I want...
    on Nov 30, 2010

  • Forum Post: the cdce913 can not nomal configuration

    yi daisheng
    Hello Everyone, If anyone has tried out block read for register readout of CDCE913 PLL chip.I cannot get it work. My situation is: the byte write, byte read are OK, meaning i2c works fine (SCL 11kHz). I take the programing sequence suggested by Datasheet (page12) also for block read. through...
    on Feb 17, 2011

  • Forum Post: Re: 0.8V p-p "clipped sinewave" input to CDCE9xx?

    mapefer3
    Thank you for posting this interesting question. It is possible to use the CDCE9xx series as a clock generator (with PLL on) by connecting a TCXO in the way described in the application notes you are referring to. The Rf internal in the CDCE9xx series is approx 500kOhms, therefore it is not needed...
    on Apr 18, 2011

  • Forum Post: Re: CDCE913, how to change the SSC Modulation Frequency

    MASAO YAMAZAKI
    HI Julian, I understand that I can't change the CDCE913's SSC modulation frequency. I have one more thing to confirm, the frequency is 36kHz, isn't it? Best regards, Masao
    on Jul 7, 2011

  • Forum Post: on board programing the CDce913

    Bnovus
    I am trying to build a poor man's on-board CDCE913 programmer. I figured I could take the programmer I bought from TI, take SDA,SCL,GND and connect them to the CDCE on the board and once I pulled VDout low and I would be ready to go. No such luck.when I try , the software can not even find the PCB...
    on Aug 1, 2011

  • Forum Post: Re: CDCE913 not locking, what am I doing wrong?

    Cypher Punks
    Just a follow-up: I checked that the ClockPro software calculated the same register contents as I did. While using it, I noticed that it tended to add common factors to M/N to make the numbers as large as possible. (At the register level, this amounts to scaling M and R by the same value.) I tried...
    on Oct 8, 2011

  • Forum Post: CDCE913 not locking, what am I doing wrong?

    Cypher Punks
    To be precise, the output frequency is about 5% high (and fluctuates a lot) and there's so much jitter that 5 cycles after the trigger point the scope screen is a confused mess of up- and down-edges. Obviously, some pilot error is involved, but I've been RTFMing for a while with no joy. ...
    on Oct 7, 2011

  • Forum Post: How to connect CDCE913's VCTRL?

    Tim Baker
    Hello, CDCE913 has pin 4 V CTRL . However, there is few information in the document about its functionality. In fact, a search of "VCTRL" in the datasheet returns only 3 items. What's the function of this pin? Can it be disconnected? Tim
    on Nov 26, 2011

  • Forum Post: Digital 1.8V clock input for CDCE913?

    Tim Baker
    Hi, If I prefer to use another digital clock to feed [pin 1, Xin/CLK], may I connect it directly to this pin? In this case, should [pin 14, Xout] be disconnected (floating) or not? And what should the voltage (maximum) of the digital clock be? Would 1.8V be OK? Tim
    on Nov 28, 2011

  • Forum Post: Should CDCE913 crystal be connected to ground?

    Tim Baker
    Hi, In CDCE913 datasheet I see there is no additional capacitor and connection to ground via capacitors from two ends of the crystal. The reason of this might be because of the internal adjustable capacitor and ground connection within CDCE913. However, in a reference design I see there...
    on Nov 28, 2011

  • Forum Post: Can CDCE913 VDDOUT be 2.8V?

    Tim Baker
    Hello, For CDCE913: The device is featured as capable of either 2.5 or 3.3V output. Pin 6,7, VDDOUT can be 3.3 or 2.5V in "Terminal Functions". "RECOMMENDED OPERATING CONDITIONS" allows 2.3V to 3.6V range. The question is that can I tie VDDOUT to 2.8V...
    on Nov 26, 2011
12

All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.

Content on this site may contain or be subject to specific guidelines or limitations on use. All postings and use of the content on this site are subject to the Terms of Use of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms of Use of this site. TI, its suppliers and providers of content reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.

TI Worldwide | Contact Us | my.TI Login | Site Map | Corporate Citizenship | mobile m.ti.com (Mobile Version)

TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs and
embedded processors, along with software, tools and the industry’s largest sales/support staff.

© Copyright 1995-2013 Texas Instruments Incorporated. All rights reserved.
Trademarks | Privacy Policy | Terms of Use