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AD7609 - Output shifted to the right by 1 bit

Question asked by shamilabw on Jul 29, 2013
Latest reply on Jul 30, 2013 by shamilabw

Hi,

 

I'm testing a board with a AD7609 interfaced with a cyclone II fpga. I managed to start the conversion process and read the data however the output is shifted to the right by 1 bit. The values on the bits<17:2> of the 18 bit value are exactly half the value you would expect and I cannot get negative values as bit 17 is always zero.

 

The DB15 line (pin 33) is always in high impedance state.

 

I have tested all the connections and they are ok.

 

Has anyone come across this? Would appreciate any pointers at this stage. Thanks.

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