AD5541A output range

Hello,

I'd like to supply 5.00 V to both Vref and Vdd on a AD5541A DAC. According to the datasheet, this is ok.  It's convenient because the DAC's current draw is low and it will save a voltage regulator.  What will the output voltage range be in this case?  There is a spec of Vref-1 LSB in the datasheet table 2, but it would be good to know the dropout voltage is only 1 LSB when Vref=Vdd.  Thanks for any advice.

-Till

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  • Using Vdd as Vref is ok. There will be some non-linearity in the last 200 codes or so and you won't get to Vref-1LSB on the output. 1LSB with a 5V reference is 76uV and even with no current draw on the output there will be some voltage drop across the internal switches. It's not possible to say how close you will get to Vdd due to a large number of factors but Vdd-50mV would be a conservative estimate.

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  • Using Vdd as Vref is ok. There will be some non-linearity in the last 200 codes or so and you won't get to Vref-1LSB on the output. 1LSB with a 5V reference is 76uV and even with no current draw on the output there will be some voltage drop across the internal switches. It's not possible to say how close you will get to Vdd due to a large number of factors but Vdd-50mV would be a conservative estimate.

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