In this document:
It says that the the full range of the ADCs is 2Vpp, and of the DACs, it's 1Vpp. Is this accurate for the NI USRPs, specifically USRP 2921?
What is it that you're trying to do with the USRP? In the NI USRP 2921 the ADC and DAC have ranges greater than those you have stated in your post.
Hope this helps,
I am trying to characterise the front-end (gain). I am inputting a signal using a signal generator and it would be nice if I could assign units (dBm) to the values I read from the USRPs instead of them being arbitrary between -1 and 1.