• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 48 subscribers
  • Views 486 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DAC3483 real bandwidth.

Max Roh
Expert 4185 points

Other Parts Discussed in Thread: DAC3484

Hi team,

 

I hope to know to promote to customer below.

#1. I, Q channel bandwidth for DAC3484.

#2. Real channel upconversion bandwidth for DAC3484.

Regards.

  • 0
    TI__Guru* 83645 points

    Hi Max,

    The maximum input data rate for the A, B, C, D channels of the DAC3484 is 312.5MSPS each. There is a half-band interpolation filter (FIR0 filter shown in figure 64) after the input, and the filter corner is about 0.4x of the input data rate. 

    1. If the signal is complex, the actual bandwidth can be achieved is 2x 0.4 x 312.5MSPS = 250MHz. The 2x factor comes from the utilization of negative frequency space of the complex IQ signal. The 0.4x is the roll-off of the half-band filter. 

    2. if the signal is real, the actual bandwidth can be achieved is 0.4*312.5MSPS = 125MHz. The 0.4x is the roll-off of the half-band filter. 

    Note: the data rate of the DAC3484 is shown on page 13 under LVDS input. The maximum LVDS toggle rate is 1250MHz, and is shared among 4 channels for 312.5MSPS of data rate each. 

    -KH