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AD7689 Analog input question

Question asked by NeuralSwarm on Feb 28, 2014
Latest reply on Mar 6, 2014 by KarenNE

Hi all,

 

I'm slightly confused by reading the AD7689 datasheet.  On p. 4 of the datasheet, the absolute input voltage of the analog inputs is listed as Vref + 0.1.  On p.9 the absolute maximum analog input voltage is shown as VDD + 0.3V. 

 

My question is that if I am using the internal reference at 2.5V, and VDD is set to 5V, then which absolute maximum is correct?  Can I apply a 4V input to the analog inputs of the ADC and not harm the device?

 

Thanks.

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