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