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.

CDCE72010 on AFE7222EVM card

Prodigy 10 points

Replies: 1

Views: 284

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). 

Chris Ward

1 Reply

  • 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?

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.