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DAC8830: Input protection diode current rating

Atis Cace
Prodigy 10 points
Part Number: DAC8830

I see that the digital inputs are defined +-0.3V VDD, presumably there is a diode clamp protecting the inputs. I cannot find the current rating of the diodes protecting the input, is there a way to obtain this information?

  • 0
    TI__Mastermind 25433 points

    Hi Atis,

    You are correct that there are clamping diodes on the pins that have the rating specified as +-0.3V VDD, but I don't have additional information about them available to share. We typically recommend adding a series resistor to limit current in the case that the voltage ratings are exceeded. 

    Best,

    Katlynne Jones

  • 0 in reply to Katlynne Jones
    Prodigy 10 points

    Dear Katlynne,

    Yes, that is the plan. However, knowing the current rating of the diodes lets me pick the lowest possible resistor while not blowing them up. This allows for faster communication speeds due to the lower RC constant. I have seen 10mA and 5mA on other chips (I don't know how low they can go actually), so adding just some resistor can be quite a gamble. Thanks anyway!

  • 0 in reply to Atis Cace
    TI__Mastermind 25433 points

    Hi Atis,

    Got it. We usually give a limit of 10mA into any pin besides the power pins and the output for our DACs, but this is an older device and I can't say for sure. 

    Best,

    Katlynne Jones