• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 47 subscribers
  • Views 685 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.

DAC3484: Dual channel output support with complex NCO

JH Shin
Guru 12735 points

Part Number: DAC3484
Other Parts Discussed in Thread: DAC5688, DAC3482, DAC38J82, DAC38J84, TRF370417, TRF3705,

Hello,

My customer is using the DAC5688 to receive I and Q input, up-convert them to complex NCO, and output one channel.

They are looking for a DAC that can use 2 channels with the same functionality.

Could you please recommend the most suitable DAC product?

Thank you.

JH

  • 0
    TI__Guru* 83035 points

    JH,

    This is a very generic question. Please advise their key concerns for switching from DAC5688.

    For LVDS based input, you have a choice of DAC3482

    For JESD204B based input, you have a choice of DAC38J82

    They have different sampling rate, with performance of equivalent or better than the DAC5688.

    -Kang

  • 0 in reply to Kang Hsia
    Guru 12735 points

    Hi Kang,

    Thanks for your reply.

    The key to the customer's inquiry is that while using Complex NCO for I/Q input, the DAC5688 only output 1CH, and they would like to expand this to 2CH with one device.

    In other words, it should be possible to receive 2 I/Q data and output 2CH with complex NCO.

    Could you please recommend a DAC product that has similar functions to the DAC5688 and is capable of 2CH output with complex NCO?

    Thanks,

    JH

  • 0 in reply to JH Shin
    TI__Guru* 83035 points

    Hi JH

    Your customer has some misunderstanding.

    The DAC5688, the DAC3482, and the DAC38j84 all support complex input, complex output operations.

    You can see equations 2 and 3above

    Equation 2 is for channel A output (I.e. Iout) while equation 3 is for channel B output (I.e. Qout).

    The complex output of Iout and Qout must be used along with a RF modulator like the TRF370417 or TRF3705 to form the final up conversion. This is where only single RF channel is formed.

    If the customer needs dual RF channel, then they need a quad DAC like the DAC3484 and DAC38j84 where they have dual Iout and Qout pair. The dual Iout and Qout pair can then connect to two RF modulators to form two RF channels.

    I believe the customer needs quad DAC solution like DAC3484 and DAC38j84