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Looking for a DAC

Manu Abraham
Genius 3510 points

Other Parts Discussed in Thread: DAC2932

Hi,

Greetings!

I am working on an application that requires a DAC to generate an analog waveform with a maximum frequency of 4-5Mhz.

The wave table data being transferred from a Cortex M7 microcontroller, with a timer and DMA peripherals.

The signal generated for test purposes, so a voltage output DAC, rather than a current output DAC.

14 bit resolution should be good enough. Even 12 bits can be gotten away with.

For this application, I wonder whether SPI communication would be sufficient for this use case ?

(I prefer SPI, to keep matters simpler and cost effective)

If so, which DAC you folks like to suggest ?

Thanks,

Manu

  • 0
    TI__Mastermind 18095 points

    Manu:

    For 5 MHz output signal, you will need a DAC capable of sampling over 10 MSPS.  This is right at a boundary for TI products as our precision line of DACs are below 10 MSPS and the high speed DACs are above 10 MSPS.  I took a quick look on TI.com in the precision parts and I did not see anything well suited for 5 MHz signals.  In the high speed department, I recommend the DAC2932.  This is a 40 MSPS DAC.  It is a current output DAC, but is equivalent to a voltage output with the use of the proper load resistor.  It uses a CMOS digital interface.  It also happens to have voltage output SPI DACs, intended for system control use, but I do not think the the SPI source can run fast enough for the sampling speeds needed.

    --RJH