• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 46 subscribers
  • Views 158 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DAC8830: Is it possible to get 0-5V output from a 2.5Vref?

Shridhar Ambady
Prodigy 10 points
Part Number: DAC8830

I'm making a single supply design, and I'm concerned I won't be able to get a precise 5V reference off a 5V supply. I know current-feedback DACs can do this but wasn't sure about regular R-2R DACs, can I feed 2.5V into the AGND pin and then use 2.5V for the Vref so the DAC outputs AGND +/- 2.5V thereby giving me 5V? Is that a valid or am I misreading the datasheet and how DACs work?

  • 0
    TI__Mastermind 19086 points

    Hi,

    You can use the output op amp in Gain  =2 configuration to get 0 to 2*Vref.

    There are op amps which can work with single supply 5V and has rail to rail input/output capabilities. 

    For this device AGND has to be 0V +/- 300mV (max). No level shifting of GND pin allowed.

    Hope this helps. 

    Regards,

    AK