This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Three-off EVM cards fitted with homebrew 125MHz VCOs and 5MHz LVCMOS references, programmed from AFE722x Software Control (V1.3) all show the same performance: apparent correct adoption of desired parameters (e.g. divider settings, levels), but with no indications of phase detector activity.
The tuning rails appear open circuit, but respond to half-rail setting. In test mode, activation of current sink or source gives the correct outputs, but in normal mode switching from positive to negative current output direction does not cause the normally low CP to go high.
One further observation: The GUI "Read all" button appears to do nothing, failing to get default settings when a unit is powered afreash (including a "refresh USB" command).
What is the VCXO output type? The proper VCXO input buffer on CDCE72010 needs to be chosen and AC/DC termination, and input buffer termination (internal) should be appropriately selected. Can you share the EVM schematic?
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
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. 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.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.