How to design a -4V~4V output DAC?

[yvonne_cc]

Hey guys,

I need to design a single power supply DAC(digital to analog converter) which could provide an output from -4V to 4V at 60mV/step. But the normal DAC can only provide positive voltage(0 ~ Vref)...

According to the datasheet of DAC8831(from TI), it could provide an output ranging from -Vref ~ +Vref by connecting OPA277 at the output of the DAC. The description of the bipolar output operation mode is attached below. Do you know how to implement the similiar DAC structure to provide -4V~4V output voltage?

Thank you very much in advance!

 

[karesz]

Hi,
I think you need only a +/-5V supply for the Op= its done!
K.

Added after 5 minutes:

These becouse DAC8831 has self an voltage output between 0V & Vref!
With the OpAmp as a buffer only you have it repeated/amplfied, bat if the OpAmp is connected into your circuit (with DACs onchip resistors); controllaed/offsetted by Uref = your output range will be between +Vref & -Vref!