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DAC34SH84: need the configuration of the DAC

Part Number: DAC34SH84

I am using DAC34sh84 with ZC706. I need to generate a modulated signal and transfer it to further systems. I am generating the modulating signal(16 bit) in the code and transferring it with the DMA. The carrier signal is being generated with the help of DDS ip in the Xilinx Vivado(16 bit). I am multiplying the modulating and the carrier signal to form modulated signal(32 bit) and transferring it to the DAC34sh84.

            I am able to generate the signal and observe it on the oscilloscope. But I am not able to generate signal beyond voltage level 107 mVpp. I observed that problem lies with the modulating signal. As it is 16bit I am not able to increase the values beyond 32767. I need to have the correct configuration of the DAC so that my problem will be solved.

The following figure shows the design flow:


The following figure shows the output of generated signal on virtual oscilloscope:

Figure 3 shows the modulating signal with higher values:

As you can see the red signal in figure.3. It got clipped after it crosses the maximum value i.e. 32767.

My DAC is configured for 32-bit input. If in any case I can increase that or generate the carrier signal in the DAC itself will be helpful.

 

Thank you for your time.