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REF input of AD5449

Question asked by Jacky on Jul 7, 2015
Latest reply on Jul 21, 2015 by msamera

Hi:

 

I want to use AD5449 in my design. The REF pin must be provided the external reference input, while the input resistance of REF pin is  11K ohm. The datasheet suggest to use ADR*** to generate the reference input, like ADR06(output current is 10mA) or ADR433 (output current is 30mA).

I am doing a multi-channel DAC design. I want to know how to determine that how many channels of AD5449 can share a reference input voltage?

When the DAC output level change, will it generate a spike at the reference?

 

Thanks

Regards

Jacky

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