DAC38J82: DAC38J82 : Complex Input and IQ summation

Hi all,

I'm trying to bring up the DAC38J82 to operate with complex samples. I need few clarification regarding the internal path flow.

I understand that the DAC38J82 has two internal digital data path (A & B) and each of these path will handle real input signal. Finally these individual output play through different DAC output port as a two independent RF signal.

Also digital data path A & B can operate with real and imaginary samples of the complex input signal respectively. It is not like each path can handle a complex signal.


1. Am I right with the above assumption?


I need to provide the complex input to DAC, up-convert in the DAC with 48-bit NCO and pass the RF sample to any one of the DAC output. For this, I hope that I need to configure phaseaddab(47:0) - NCO for the path AB with the required frequency. This NCO will generate the required SIN and COS component. FMIX component will do the complex mixing with the NCO generated complex samples and digital path A (I) & B (Q) as an another complex samples.

This FMIX block will generate I_OUT & Q_OUT as a separate path A & B. This I_OUT and Q_OUT can be played through two different DAC and sum this output with external sum block to convert this zero-IF to RF.


2. Am I right with the above assumption?


I found an option outsum_ena to add digital path A with path C and digital path B with path D.


3. Is there any option available to add this path A (I_OUT) and path B (Q_OUT) of the FMIX output?


So that I no need to have an external sum block to convert the zero IF signal output to RF.

Thanks

Loganathan N