Question
The customer ADZ Nagano uses an ADUCM360. He need internally an reference Voltage of 2.5V. The internal reference is 1.2V. Is it possible to gainthis 1.2V reference voltage with the additional internal buffer to 2.5V and if yes how to do this.
Answer
The buffer that you mention is just a unity gain amplifier to reduce the amount of current drawn from an external reference.Also the 1.2V reference that is available on the pin should not be loaded.
If the customer needs a 2.5V reference then he needs to supply it externally.