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ADUM5422 Footroom voltage at unipolar supply

Question asked by logan54 on Jan 19, 2015
Latest reply on Jan 27, 2015 by logan54

Hello Forum,

 

I’am planning to use AD5422 as DAC for an industrial control loop which can be operated at 0-10V or 0-20mA output on a single terminal. When I use voltage type output, you have described a “Footroom“ of about 20mV when the digital value “0x0000” is output. I’ve planned as supply a unipolar 0/24V rail. Is it a good choice to provide a -5/24 power rail to the AD5422 to provide zero voltage output when the digital value “0x0000” is written and what is a typcial current flow for the supply rails?

 

Regards,

Logan54

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