What is refference current,, input range and input Impedance for VRef in if is used as input for externa reference voltage?
In addition to considering the use of internal and external reference connected through the switch any as DG411 Ron 20ohm and do not know what it will flow through the current will?
The second question.
external reference of 3.3 V
It will be a problem if this voltage appears on the input Vref at a time when you will still turned on internal reference?