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DAC3282: Inquiry Regarding DAC3282 and Similar Dual-Channel DACs for Sin/Cos Signal Regeneration

Chen Chun-Kuang
Prodigy 10 points
Part Number: DAC3282
Other Parts Discussed in Thread: DAC3174, DAC5672A

Tool/software:

Hi Ti Team,

I would like to confirm whether my understanding of the DAC3282 as a dual-channel DAC is correct, as illustrated below:

1. Series input: Data1 and Data2 

2. Parallel output: Analog1 and Analog2

We’re planning to handle 5–6 sets of input data, so we are currently looking for a suitable dual-channel DAC that meets this requirement.

In addition to the DAC3282, we’ve also identified the DAC3174 and DAC5672A as potential options with similar capabilities (lower performance and different bus interface). Could you please advise whether these devices also fulfill the dual-channel of our requirement?

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

For your reference, here is our actual system architecture:

Block Diagram.pdf*Attached file. In case the diagram above is unclear due to resolution

The DAC is used to regenerate the original sin/cos analog signals from the source input.
The specifications of the source sin/cos signals are as follows:

  • Amplitude: 1 Vpp

  • Offset: 2.5 V

  • Frequency: 1–5 MHz

We would like to confirm if the DAC3282 (or DAC3174 and DAC5672A) is suitable for this application.

Thank you for your support!

Sincerely,

Jonas Chen

  • +1
    TI__Guru* 78744 points

    Hello, 

    Your understanding is correct. Please follow the input format below. I signal = Channel 1, Q signal = channel 2.

  • 0 in reply to Kang Hsia
    Prodigy 10 points

    Hi KH,

    Could the DAC3174 and DAC5672A also be used in this application? (dual channel)
    From the datasheets, it seems possible, but I’d like your confirmation.

    Sincerely,

    Jonas Chen

  • +1 in reply to Chen Chun-Kuang
    TI__Expert 3440 points

    Hey Jonas, 

    The DAC5672A is a CMOS device that doesn't support DDR data like the DAC3282 does. It does support putting DACA and DACB data on the A CMOS bus however. The way the data is framed is quite different, but the principal is still the same. In addition the DAC5672A does not support interpolation like the DAC3282 does which means the input rate and DAC rate are always the same. 

    The DAC3174 is an LVDS device that does support DDR data like the DAC3282 does, however like the DAC5672A it also does not support interpolation. 

    So yes, both devices do have the ability to put channel A and channel B data on the same bus, but there are some caveats. 

    1. The DAC3282 supports interpolation, which can lower your input rate compared to your DAC update rate. Those two other devices do not. 

    2. DDR is not supported with CMOS devices, however the DAC5672A does have the ability to interleave channel data on a single bus with other means. 

    Regards, 

    Matt

  • 0 in reply to Matthew Kramer
    Prodigy 10 points

    Hi Matt,

    Thank you for the detailed explanation—it really helps clarify the differences between these DACs and supports my current understanding as well.

    It’s especially useful to confirm that both DAC5672A and DAC3174 can support dual-channel data on a single bus, but with important limitations compared to the DAC3282.

    Appreciate your support!

    Sincerely,

    Jonas Chen