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DAC7678: DAC7678 Output Current Limits

Danielius Kramnik
Prodigy 60 points
Part Number: DAC7678

The DAC7678 datasheet both lists the maximum output current capability as +/-20mA ("Specified by design or characterization; not production tested.") and also later states that the maximum supported load for the output buffers is is up to 2kOhms || 1nF, which is considerably less (with 5V supply, that's 2.5mA output current). Which is it and how can I tell from the datasheet?

I need to drive a 300 Ohm load at up to 5V on multiple channels at a time, so that's 16.7mA per channel (does the 20mA per channel rating still hold for multiple channels driving that amount of current?).

  • 0
    TI__Genius 14220 points

    Hi Danielius,

    Thank you for your query. We specify the output load in two ways: current source/sink and capacitive stability. So, the DAC can support 16mA current per output. However, when you draw this current from all the outputs simultaneously, the power dissipation needs to be taken care of. The power dissipation on the device is decided by the (voltage drop * current output per channel) * number of channels + quiescent power.

    You need to look into the thermal management when drawing this amount of current simultaneously.

    Hope that answers your question.

    Regards,

    Uttam Sahu

    Applications Engineer, Precision DAC