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DAC101S101: Output current capability to drive LED

Eric S
Expert 5550 points
Part Number: DAC101S101

Hello, I am trying to shave design cost, and want to use DAC101S101 output to directly drive an IRLED (with series R) requiring ~5mA.   The datasheet only spec's short-circuit current.  Can the output safely drive up to 5mA current to drive the LED?

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    TI__Mastermind 46290 points
    Eric,

    Load regulation is sometimes expressed differently from one datasheet to the next, in this case the datasheet is trying to convey this through the "DC Output Impedance" and "Output Short Circuit Current" specification. The division and which specifications are relevant depend on what the DAC output code is set to.

    Amplifier output impedance / characteristics change near the rails, so the Output Short Circuit current specifications explain what is happening at full-scale and zero-scale codes for either 5V or 3V supply conditions.

    In the linear region of operation you can use the DC output impedance spec. So for most of the output range you can expect 6.5mV, typical, voltage droop when sourcing 5mA. Though this performance may be worse when operating with the output near the rails.