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?