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DAC39J84EVM: Use this DAC or similar DACs to provide DC signal

Weiyu Leng
Intellectual 360 points
Part Number: DAC39J84EVM

To whom it may concern,

The schematic of DAC39J84EVM shows that the differential DAC output is transformed to single-ended through a Balun, which has a lower cut-off frequency of 10MHz. 

However, it seems that the DAC chip itself doesn't have any lower limit on signal frequency. 

I need to provide a 0~60MHz baseband signal with non-zero average sampled at 200MHz.

How can I solve this issue?

Thank you!

Weiyu

  • 0
    Intellectual 360 points
    Follow-up:

    I discovered that DAC39J84EVM does leave a differential option at its output. Theoretically, I can bypass the two transformers and directly connect the differential DAC output to two matched SMA connectors. That's what I want.

    However, how can I bypass the transformers reliably without hurting the bandwidth?
    If you have already left a pair of differential ports, there must be a way to use it, right?
    I look forward to your help!

    Thank you.

    Weiyu
  • 0 in reply to Weiyu Leng
    TI__Guru* 91947 points

    Weiyu,

    I sent you another post describing how to bypass the transformers.

    Regards,

    Jim