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.

  • TI Thinks Resolved

DAC39J82: One or Two Complex Mixers

Prodigy 70 points

Replies: 1

Views: 40

Part Number: DAC39J82

Copied below is  para 7.3.11 for the DAC37/38J82 and DAC39J82 DACs. The former have 2 full complex mixers, whereas the DAC39J82  has only one. Is this correct?

I need to generate two analog outputs, < 1M bandwidth, center freq =70+/-2.5MHz.  I need two independent NCOs/  complex mixer up-converter. If I read the DAC39J82 data sheet correctly, it cannot do the job I need. Is this correct?

7.3.11 Full Complex Mixer  
The DAC37J82/DAC38J82 has two full complex mixer (FMIX) blocks with independent Numerically Controlled
Oscillators (NCO) that enables flexible frequency placement without imposing additional limitations in the signal
bandwidth.

7.3.11 Full Complex Mixer
The DAC39J82 has a full complex mixer (FMIX) block with a Numerically Controlled Oscillator (NCO) that
enables flexible frequency placement without imposing additional limitations in the signal bandwidth. The NCO
has a 48-bit frequency register (phaseaddab (47:0)) and 16-bit phase register (phaseoffsetab (15:0)) that
generate the sine and cosine terms for the complex mixing

  • Guru 66830 points

    Des,

    This is a typo in the data sheet. The DAC37J82, DAC38J82 and DAC39J82 (2 CH DAC's) all only have one complex mixer. The DAC37J84, DAC38J84 and DAC39J84 (4 CH DAC's) have two complex mixers.

    For your application, you could use the 4channel version of this part or a part in the DAC38RFxx family.

    Regards,

    Jim

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.