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When drawing a load current at either rail, the output voltage headroom with respect to that rail is limited by the 25 Ω typical channel resistance of the DAC channel

Category: Datasheet/Specs
Product Number: AD5593R

When drawing a load current at either rail, the output voltage headroom with respect to that rail is limited by the 25 Ω typical channel resistance of the DAC channel.

For example, when sinking 1 mA,the minimum output voltage = 25 Ω × 1 mA = 25 mV. 

If I need to sink 25mA current, does that mean that the minimum output voltage is 625mV, and in practice I need to supply 20mA current, what happens to the output voltage

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