DAC3482: Operating DAC3482 on non complex signals

aronii

Part Number: DAC3482
Other Parts Discussed in Thread: ADS4249,

I got a digital data stream (2's complement format) coming from ADS4249 14 bits ADC at 250 MHz.

Those are actually 2 independent channels (like a 2 oscilloscope channels).

I would like to output this data (Thru FPGA) to DAC3482 and disable the internal complex mixer or any other operation between the data of the 2 channels (i.e. reconstruct the 2 Analog channels that I input to ADS4249) while doing X4 interpolation and taking advantage of the internal SINX/X interpolation with the internal smoothing filters (Fig. 65 in the datasheet). Is it possible to do that?

If I use the DAC in this mode, would it be possible to correct the gain and offset of each channel independently? (Mixer is OFF).

I would appreciate your detailed answer including which registers to set in order to do that.

over 6 years ago

0 aronii over 6 years ago

Expert 1140 points

Hello, Can anyone answer this question? Thanks.

0 aronii over 6 years ago in reply to aronii

Expert 1140 points

??????????

Does anyone knows the answer?

0 Ebenezer Dwobeng over 6 years ago in reply to aronii

TI__Genius 9695 points

Hi Aronii,

Take a look at this TI design which implements a similar design to what you describe.
www.ti.com/.../TIDA-00069

After reviewing this let us know if there are any questions we can help with.

Thanks,
Eben.

0 aronii over 6 years ago in reply to Ebenezer Dwobeng

Expert 1140 points

I already know this design. I read the description "Interfacing Altera FPGAs to ADS4249 and DAC3482" again and there is not a single word about the Analog usage of that design.

The word "MIXER" does not even appear in this document. The drawing shows only 1 Analog input + 1 GHz clocks. All of that paper describes only Digital signals. Not a single word about Analog signals.

So the question still remains: Is there any way to use the DAC3482 as 2 separate DAC channels WITHOUT mixing between them and with using the interpolation feature and the internal inverse sync filter ?
Please answer a.s.a.p

We want to bid on a big project with thousands of chips. We must bid until Monday.

0 Ebenezer Dwobeng over 6 years ago in reply to aronii

TI__Genius 9695 points

Hi Aronii,

Yes, it is possible to bypass the mixer in the DAC and output the baseband signal without any frequency translation. The inverse sync and interpolation filters are all available even with the mixer bypassed.

Thanks,

Eben.

0 aronii over 6 years ago in reply to Ebenezer Dwobeng

Expert 1140 points

Thanks!

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DAC3482: Operating DAC3482 on non complex signals