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DAC5682z and DAC3283 format data input

Aminath BADAROU
Prodigy 120 points
Other Parts Discussed in Thread: DAC3283, DAC5682Z

Hello,

I want to know what is the difference between DAC5682z and DAC3283 on their format data input.  In the DAC5682z datasheet, it is said that it was" a dual-channel 16bit ,1GSPS digital-to-analog converter with wideband LVDS data input " and in the DAC3283 datasheet  it's said " The DAC3283 is a dual-channel 16-bit 800 MSPS digital-to-analog converter (DAC) with an 8-bit LVDS. On the first DAC functionnal block diagramm, we have 16 bit input in LVDS format and on  the second one , it's only 8 bit in LVDS format. . Moreover, with DAC5682z, if i well understand the datasheet, we only need one period of DCLKP/N  to have both I and Q data. But with DAC3283 , we need 2 period of DATACLKP/N to have I and Q data.  I dont understand why both DAC is 16 bit.

Thanks for your help.

Regards

  • 0
    TI__Expert 5820 points

    Aminath

    DAC3283 needs twice the time to assemble one 16-bit I/Q Sample as compared to DAC5682z because its input bus is only 8-bit wide, which consequently impacts the maximum input data rate into the DAC. The maximum data rate into DAC5682z is higher than DAC3283 because you can feed more data (16-bits in parallel) into the DAC.

    Assuming use of both DACs in DUAL DAC mode:

    maximum data rate into DAC5682z = 500 MSPS (data has to be interpolated by 2x inside the DAC to create an output at 1 GSPS)

    maximum data rate into DAC3283 = 312.5 MSPS (with no interpolation, output of DAC is also 312.5 MSPS and with 2x interpolation it is 625 MSPS)

    AND

                                   = 200 MSPS (with 4x interpolation, output of DAC is at 800 MSPS)

    Regards


  • 0 in reply to Hamza Fraz
    Prodigy 120 points

    Mr Hamza,

    Thanks for your explanation. It's more clear .

    Regards