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DAC7811: Vref connected to sine wave

Part Number: DAC7811
Hi,
i am using DAC7811 for one of my project. My design is to feed Vref pin with 8v p-p sine wave ( 5 khz) and then control the amplitude , using a current to voltage conversion. i am sending commands in SPI but still there is no output.
i expected to change the aplituded of the output as per SPI DAC codes.
i am using a PIC controller and for current to voltage conversion i followed DAC7811 datasheet.
please let me know where could be the issue.
thanks in advance for your helping hands.
Ram