AD6688

I am capturing data from AD6688-3000EBZ  using  ADS7-V2 board and ACE (Version 1.12.2718.1186).   When I apply  a tone  with 1.7 Vpp    I expect the maximum on the DDCFFT graph to be  0 dB ( corresponding to full scale) however it is approx. -30 dB. İs this a conversion issue or something is wrong ?

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