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Weak signal at the DAC input

Question asked by HIDIR on Jul 27, 2012
Latest reply on Aug 2, 2012 by HIDIR

Hi everybody ,

 

I have created my own DAQ board using AD6644 and AD9764 as indicated in their evaluation boards' document.

I want to ask some questions :

 

1) The Vref supply does not source current after the AVCC is connected is it OK ?

 

2) Is there a problem in the conversion if i directly apply the analog ground to SLEEP pin different than as indicated in the datasheet http://www.analog.com/static/imported-files/data_sheets/AD9764.pdf page 18 ? The digital VDD is 3.3 V.

 

3) As in my thred in xilinx forum http://forums.xilinx.com/t5/Xilinx-Boards-and-Kits/Weak-signal-at-the-Spartan-3AN-FX2-outputs/m-p/250748

     do you have any suggestion about the FPGA output configuration ?

 

Thank you very much

 

HIDIR

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