Hi Antonio,
Since your application involves a SHARC processor, you may find better results posting your question here:
http://ez.analog.com/community/dsp/software-and-development-tools/sigmastudio-for-sharc
When you set the sampling rate atop SigmaStudio's schematic window to 192KHz, you're telling SigmaStudio to set up the parameters of your filters, oscillators, etc. to work at that sample rate -- but that does not automatically set the sample rate of the Sharc in your EZ-Kit to actually run at 192KHz. Thus, when your sine wave source expects 192KHz but is actually running at 48KHz, its output is 4x lower in frequency than planned. Operating sample rates of SigmaDSPs are set in the register control window of SigmaStudio, but I'm not familiar with how to set your EZ-Kit to run audio at 192KHz.
Best regards,
Bob