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DAC8831EVM troubleshooting help

Other Parts Discussed in Thread: DAC8831, DAC8831EVM

Hi everyone! I'm using a DAC8831EVM with a Spartan 3E. I have already connected SPI lines: SCLK, SDI, CS, LDAC. I have check on the oscilloscope that the Spartan 3E generates a correct SPI signal, and the datasheet of the DAC8831 aproves a digital input high from minimus 2.1V, so my Spartan gives signals from 3.3. V.

Also have DGND to Spartan GND

I apply the voltage supply on the DAC8831EVM J3: +5V, and +5V, -5V, and GND.

I have my LDAC signal from Spartan, so W3 is 2-3

I left the default Vref, so W1 is 1-2

I have an SPI data of hxFFFF, for test

    And when I select SW1: Uni: I have a Vout of 0 V

     When I select SW1: BiPolar, I have a Vout of -2.5V

C1: SDO, C2:SCLK, C3:CS, C4:Vout

What am I missing?? Is there an other line of the DAC8831 that I should consider??

Thanks alot for your advices