I am using STM32L432KC Nucleo Board. My Vref is connected to 3.3V but I wish to limit my DAC output from 0 to 1 V. How I can achieve this?

Using only output values corresponding to that voltage span... ?

JW

Yes this will be my alternative but can I used Vref Buffer for 2.5V?

Pretty sure the delta between VDD and VREF is constrained. The Data Sheet would be instructive on this matter.

So truncate the values, or put an OPAMP on the output.

Thanks definitely I will read datasheet for more details. Thanks to you and Jan Walclawek.

If VDD - VREF is too constrained, use solution through hardware, a voltage divider. This will retain 12 bit resolution.​