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DAC3283: Design Inquiry

Abhishek Manoj
Intellectual 435 points
Part Number: DAC3283
Other Parts Discussed in Thread: DAC5689

Tool/software:

Hi Team,

I'm planning to use the DAC IC DAC3283 in my board.

I have one query regarding the IC. I want an input Frame Sync or Clock Sync signal which must be coming from the processor in order to sync all my clock circuitry in the board, i want the DAC ICs with an clock sync option.

Does the above mentioned DAC support any input clock sync option. 

If not please suggest any other DAC IC with 16bit resolution, 34MSPS speed, 2 channel is available for my application.

Regards,

Abhishek

  • 0
    TI__Guru* 79294 points

    Hello, 

    The DAC3283 supports the frame sync input and OSTR signal to synchronize the input/output FIFO for the DAC3283.

    There is no option to provide an output to synchronize your clock circuitry. You will need to look at other DAC options.

    I will refer you to our other product groups for reference.

    -Kang

  • 0 in reply to Kang Hsia
    TI__Mastermind 42273 points

    Hi Kang, 

    We don't have any devices in the precision DAC portfolio that reach 34MSPS.

    It looks like Abhishek is looking for the DAC to have a sync input, not output. The processor will have an output. 

    Best,

    Katlynne Jones

  • 0 in reply to Katlynne Jones
    Intellectual 435 points

    Hi Team,

    I want a DAC to have sync signal coming from the processor. For DAC3283, i didn't see any SYNC pin. Can you tell which pin should be used as SYNC input pin.

    Regards,

    Abhishek

  • 0 in reply to Abhishek Manoj
    TI__Guru* 79294 points

    Hello Abhishek,

    For the DAC3283, the FRAME signal will synchronize the FIFO input pointer. There is no pin at the DAC3283 to synchronize the clock circuitry.

    I would like to check what do you mean when you say you need a input signal to sync your clock circuitry. Would you kindly share your block diagram or concept so the folks here can help you find the best suitable part. The definition of clock circuitry sync has many meanings to different applications.

    -Kang

  • 0 in reply to Kang Hsia
    Intellectual 435 points

    Hi Kang,

    The sync pin or signal is that the FPGA synchronizes all the DACs and ADC in the board. It is the output coming from the FPGA and connected to DACs IC so that FPGA has a control to sync all the ADCs and DAC.

    I have attached the images for your reference

    Regards,

    Abhishek

  • 0 in reply to Abhishek Manoj
    TI__Guru* 79294 points

    Abhishek,

    In this case, you will also need to supply OSTR signal from the clock source. Please see below excerpt from the DAC3283 datasheet.

  • 0 in reply to Kang Hsia
    Intellectual 435 points

    Hi Kang,

    For OSTR pin

    there is not words mentioning like this pin can be used to an input sync in pin to synchronize all the clock circuitries in the board.

    Does this OSTR pin function same as SYNC pin as in DAC5689.

    I need this type synchronization in the board for my application.

    Please confirm this.

    Regards,

    Abhishek

  • 0 in reply to Abhishek Manoj
    TI__Guru* 79294 points

    Hello Abhishek,

    The DAC3283 OSTR is used in dual sync sources mode, and can synchronize the FIFOs of multiple DAC3283s to align the output pointer. Therefore, you can in theory synchronize the output stage of multiple DAC3283s. See the excerpt from the datasheet for detail

    I again do not know your application requirement. Like I had asked earlier, if you can clarify your requirement, this will help all the DAC teams here to provide possible alternative solutions.

    -Kang

  • 0 in reply to Kang Hsia
    Intellectual 435 points

    Hi Kang,

    My requirement is that all the ADC and DAC IC get an input signal from FPGA to have synchronization between all the DAC and ADCs in the board.

    In board I'm planning 3 ADCs and 10 DACs for my application.

    The SYNC IN signal is coming from the FPGA is fed to the ADCs and DACs as input signal.

    The signal from the FPGA may be a single SYNC IN signal for all the ADCs and DACs or  we use different sync signals like SYNC IN1, SYNC IN2,..... will be send to each of the ADCs and DACs IC. The function of the synchronization is this, the pin name can be SYNC in or LDAC etc. I want the signal coming from FPGA need to be communicated with ADCs and DACs in the board.

    This is the must requirement for DAC.

    Regards,

    Abhishek

  • 0 in reply to Abhishek Manoj
    TI__Guru* 79294 points

    Hi Abhishek,

    The DAC3283 does not support the feature that you listed above.

    -Kang